134th OCC Minutes- 11.08.2017 Page 1
Southern Regional Power Committee Bengaluru
Minutes of the 134th Meeting of Operation Coordination Committee
held at Neyveli on 11th August 2017
1 Introduction
1.1 The 134th Meeting of Operation Coordination Committee was conducted at NLC, Neyveli on
11th August 2017. The list of participants is furnished at Annexure-1A.
1.2 Shri A Suryanarayana, CGM, Therrmal, NLC welcomed MS SRPC, DGM SRLDC and
respected delegates from power sector of SR to the 134th OCC Meeting being held at NLC. At
the outset he thanked Member Secretary, SRPC for giving NLC the opportunity to host the
meeting. He expressed that Team NLC is striving to see that each and every participants is
comfortably placed and hoped that they all would enjoy the stay at NLC. He informed that
previous day (09.08.2017), DISCOM members had been apprised of associated mine issues
etc. NLCIL being a public sector company was highly customer oriented with much emphasis
on CSR. First largest power plant of Southern Region (50 MW) started from Neyveli on lignite
with Russian collaboration in 1962. Even though residual life certification period was over for
NLC TS I, the units had received consent for further operation. But in compliance to new
environmental norms and taking into account level of pollution level and heat rate etc. the
station had been identified for Phasing out. New plant of 1,000 MW is planned in place of NLC
TS I Station and NLC is ambitious to bring the station on bar by March 2018. NLC TS II has
got 7 units of 210 MW Capacity in which 3 Units were with Hungarian boilers and Italian
turbines while four units were supplied by BHEL. These units have given more than 85 % PLF
and served more than 25 years. Now all the units are planned for R & M activities. 3rd Station
consisting of 2 Units of 210 MW Capacity supplied by Italy had operated with very good PAF
and forced outage is observed to be very minimal. With collaboration of TANGEDCO, NLC
was having two units of 500 MW at Tuticorin. NLCIL is also having two units of 250 MW
capacity with CBFC technology which are facing initial teething problems. However in
association with BHEL modification works had been carried out and full load operation
demonstrated. Some more identified problems would be rectified shortly and units would be
available for full load operation. NLCIL has also put up 10 MW Solar plant at Neyveli and 51
MW of Wind in different parts of Tamil Nadu. NLCIL was very much ambitious to promote RE
and had tied up with Tamil Nadu for another 700 MW of Solar. By 2025 NLCIL would have a
total Installed Capacity above 20,000 MW with a mixture of coal, lignite, solar and wind plants.
He opined that even after commissioning of huge quantum of wind and solar, 50 %
dependence on thermal would be there and NLCIL‟s emphasis on Thermal would continue
since RE was seasonal. NLCIL was planning to change the strategy of maintenance schedule
matching with RE/Wind penetration season. He thanked TANTRANSCO for always supporting
NLCIL and for supplying spares whenever requested. He informed that NLCIL would come
forward with trading center with the requisite infrastructure. NLCIL is also known for best O &
134th OCC Minutes- 11.08.2017 Page 2
M practices and he welcomed all the entities to NLC to have consultation for mutual benefit.
He stated that OCC forum deals on various operation coordination issues like planned
maintenance of generators and it is a platform of senior level representation where numbers of
operational issues are addressed, monitored and long term corrective measures are agreed
and implemented. The objective is to ensure reliable power, continued power supply,
optimizing the availability of generating stations, transmission lines etc. NLCIL was honored
and glad to host this meeting and wished that the deliberation during the course of the meeting
would be fruitful and wished all the very best for the same.
1.3 Shri S R Bhat, Member Secretary, SRPC welcomed all the delegates to 134th OCC Meeting.
He complimented Shri A Suryanarayana, CGM (Thermal) for his excellent efforts in organizing
the meeting at NLC and appreciated his level of involvement in making arrangements to
ensure that participants are comfortable at NLC. He on behalf of OCC wished him all the very
best as he was superannuating in August 2017. He also thanked Shri D Venkatasubbaiah
CGM who had also spent his valuable time in coordinating the conduct of the meeting. He
wished Shri N Sabapathi, CGM who was due to superannuate in October 2017 all the best
and recalled that he was a valuable member of Protection Committee of SRPC and had
contributed a lot. He thanked Mr. S. Ravi, DGM, Planning & Mr. Govindarajan, CM for their
untiring efforts in making the meeting a big success.
On the Grid Operation side he listed out the following:
Operation of Hydro in Peaking Mode is an important issue to be discussed. Forum of
Load Despatchers (FOLD) and POSOCO have prepared a Report on Operational
Analysis for Optimization of Hydro Recourses & Facilitating RE Integration in India. It was
observed by POSOCO that there were a number of Hydro stations, particularly in state
sector which are not operated in peaking mode. The subcommittee constituted by MoP to
examine these observations had concluded that there is a scope of about 2,000 MW
additional power generations from hydro stations during peak hours. Chairperson, CEA
had advised to discuss the operational analysis in the forthcoming TCC/RPC Meetings in
all Regions and also desired that this can also be made a regular agenda for monthly
OCC Meetings also.
There is a Meeting scheduled on 16th August 2017 at CEA which would be chaired by
Chairperson, CEA to discuss on the subject, „Improve Hydro Generation by one third of
the existing Installed Capacity‟. MoP had constituted a Committee to study and chart an
action plan preferably within three weeks of constitution of the committee to improve the
hydro generation by one third of the existing Installed Capacity. CEA had requested for
certain information in prescribed formats which was to be furnished by 14th August 2017.
He requested the constituents to submit this information.
134th OCC Minutes- 11.08.2017 Page 3
Chief (Engg), CERC vide letter dated 05.06.2017 had sought report on RGMO/FGMO
status/report jointly vetted by SRLDC/SRPC. The report had been communicated to
CERC vide letter dated 24.07.2017. Further a list of generators which had exhibited
inadequate RGMO/FGMO response in the four incidents analyzed was also submitted to
CERC vide SRPC letter dated 28.07.21017.
A Special Meeting of SRPC Members of constituent states was held on 31st August 2017
at Hyderabad to discuss and finalize the Overarching Agreement to avail surplus power
available among SR States.
He congratulated Tamil Nadu for crossing 100 MU/day in Wind Generation. But on the
other hand total Wind generation in the Region on 10.08.2017 was 38 MU which exhibits
the RE intermittency, even though it may be predictable, the variation is huge. Hydro
position is also very low compared to last year. Thus it is the right time for all SR States
to enter into mutual agreements with each other to avail surplus power available with
other states. The agreement could be signed on 17th August 2017 at SRPC Bengaluru by
all SR Constituents. He requested all the States to sign the Agreement which is open
ended without any commercial liability to any of the constituents. He hoped that SR could
set an example of mutual cooperation by entering into this overarching agreement which
would be a win-win situation to all.
As agreed in the 132nd OCC, joint validation of UFR/df/dt reliefs was carried out for
Karnataka, Telangana, Andhra Pradesh and Tamil Nadu. Few observations like
overlapping, negative flows, grid feeders, visibility etc had been noted. These needed to
be addressed at the earliest. Similar exercise had been planned for Kerala and
Puducherry on 29th and 13th August 2017 respectively.
He congratulated NTPC for declaring COD of Unit I of Kudgi Station from 00:00 hours of
31st July 2017. Nizamabad – Maheswaram lines are test charged and he hoped that in
coming days Inter Regional ATC/TTC improvement would take place. Both Units
Kudankulam are out, while one unit was under planned maintenance the other was under
forced outage. Suddenly some of the states are facing very high shortages and he
requested all to optimise the generation levels.
He complimented Simhadri Stage II and NLC TS I Expansion for achieving more than
100 % availability during July 2017.
CEA had desired confirmation regarding FGD Implementation in NLC Units within one
weeks‟ time and requested NLC to furnish the same.
1.4 SE (O), SRPC took up the Agenda for discussions.
2 Confirmation of the Minutes of the 133rd Meeting of OCC of SRPC held on 13th July 2017
The minutes of the Meeting were confirmed.
134th OCC Minutes- 11.08.2017 Page 4
3 Monthly Outage Plan/ Annual Outage Plan
3.1 ISGS/CGS
Planned Outages of CGS/ISG stations approved for the month of July 2017/August 2017 are
enclosed at Annexure-3A.
3.2 Rescheduling/ Planned outages of Generating Stations
3.2.1 Neyveli TPS II- Planned maintenance of Unit-V
3.2.1.1 In the 133rd OCC meeting held on 13.07.2017 approval was obtained to take Unit 5 of TPS II
under shut down for 25 days from 21.07.2017 for Annual Overhaul works. NLC vide letter dated
29.07.2017(Annexure-3B) had informed that as there was slight delay in firming up the
maintenance contract, the planned shutdown could not be commenced on the approved date.
The unit now is planned to be taken out of bars for planned works from early hours of 30.7.2017.
All efforts will be taken to complete the maintenance works at the earliest and bring back the unit
into service.
3.2.1.2 Further NLC vide letter dated 31.07.2017 (Annexure-3C) had informed that due to the delay in
bringing back unit 3 after forced outage, it is proposed to commence the planned works in Unit 5
from early hours of 01.8.2017. All efforts will be taken to complete the maintenance works at the
earliest and bring back the unit into service.
3.2.1.3 NLC was suggested to plan in advance and adhere to maintenance schedule.
3.2.2 Rescheduling of Overhauling
In the 133rd OCC Meeting it was emphasized that the maintenance schedule firmed up in OCC
needed to be adhered by the generators as it had LGB, commercial, ATC/TTC, market and grid
security issues. All the generators needed to plan the maintenance and have periodic
preliminary review meeting with the OEM / Maintenance Agency to avoid any rescheduling. Any
unilateral decision by the generator could be considered as a violation of the IEGC.
3.3 ISTS/State Sector Transmission Lines and Elements Outage proposals for the months of August/September 2017 in respect of Central and State
Transmission lines and elements were approved and posted on SRPC website
(http://www.srpc.kar.nic.in/website/2017/operation/plout134occ.xls). All utilities are to submit the
S/D proposals for the subsequent month by 3rd of the current month. Shutdown requests for the
same month needed to be avoided. An outage coordination group had been created
([email protected]) for review of the previous OCC approved shut
downs (construction/critical).
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3.4 Non-availing the OCC approved shut downs
3.4.1 In earlier OCC Meetings, SRPC & SRLDC had stated that in spite of huge efforts being put into
finalizing the shutdown approvals, non-availing of the same (greater than 50%) was a matter of
serious concern. Power purchase by the states was also being planned based on these
approved outages and any changes may affect their LGB and in some cases ATC/TTC was also
getting affected. It was agreed that SRLDC would post the approved outages availed and non-
availed by 3rd of every month. Subsequently constituents should revert back with the reasons for
non-availing the shut down by 6th of every month.
3.5 Request for deemed availability of outage
3.5.1 PGCIL SR II vide letter dated 04.08.2017 (Annexure-3D) had requested for deemed availability
for outage of 400 kV lines connected to Salem S/s and Kolar S/s.
3.5.2 In the Meeting it was noted that deemed availability would be considered as per Regulations.
3.6 Number of Outages approved V/s Availed
3.6.1 Status of shut down availed against shut down approved as furnished by states is as below:
3.6.2 SRLDC presented the status of availed shut down vs approved shut down state wise and for the
Region as per the information available with them. Element wise information is at Annexure-3G.
Percentage as computed by SRLDC is as follows :
AP KPT
CL
MEL KTL KSEB NLC NTPC SR I SR II TANT
ANSC
O
TST
RAN
SCO
SR
46 38 100 100 71 50 100 65 58 73 53 59
State/Utility AP TS KAR KER TN SR I SR II
No of shut downs approved
24 13 8 17 21 17 29
No of shut downs carried out as per schedule
11 7 3 15 16 11 20
No of shut downs deferred
13 6 5 2 5 6 9
Percentage of shut down carried out
46 54 38
100 76
76 (Annexure-3E)
69 (Annexure-3F)
134th OCC Minutes- 11.08.2017 Page 6
3.6.3 KSEBL informed that only two shut downs were not availed. KSEBL informed that the
percentage availed is not matching with SRLDC projected figures. SRLDC clarified that only 400
kV lines and interstate feeders at 220 kV lines were considered in the analysis.
3.6.4 APTRANSCO informed that one shut down was postponed and it was considered as not availed.
3.6.5 TSTRANSCO informed that Malkkaram-Suryapet line shutdown was not carried out because of
heavy rain. Hyderabad ICTs are not availed due to absence of MRT officials.
3.6.6 KPTCL informed that 3 shut downs at Guttur was not taken by GE and one shut down at
Talaguppa was not taken because of heavy rains.
3.6.7 SR I informed that they couldn‟t avail 3 shutdowns as tower was not erected due to ROW issues
(Construction of PNTML 765 kV S/C Dharmapuri - Tumkur). One shutdown had not been availed
because of adverse weather conditions. Talcher-Kolar shut down was rescheduled. One shut
down was not availed due to non-concurrence from NLDC and one was not availed due to bad
weather. As advised by CC/Engg and OEM, the PIR removal is not required for CGL make CBs
and hence two of the shut downs were not availed. One was deferred to club with proposed SD
by TSTRANSCO for line crossing.
3.6.8 SR II informed that shut downs were not availed due to various reasons like delay in material
supply, ROW issues and Non supply of 33 kV Sleeves by agency (Racoon)
3.6.9 It was noted that even after giving opportunity to review the proposals through Mid Review
provision, the low percentage of availing of shutdown as per schedule was a matter of concern.
Concerted action was required from all entities to ensure that shut downs are availed as per
schedule.
3.6.10 MS, SRPC expressed concern on non-availing of approved outages and requested that all
efforts should be made to minimize the deviation from schedule. He pointed out that during any
unforeseen contingencies such as grid incidents/disturbances etc, instances of transmission
outages (unplanned/emergency) are likely to be scrutinized and viewed closely.
3.6.11 SRPC and SRLDC pointed out that few constituents/utilities were not furnishing outage requests
as per specified time schedule and current month proposals for AMP works were also being
furnished. All the utilities were requested to follow the procedure and the time lines.
3.6.12 All utilities were requested to furnish the details/deviations with respect to their Annual Outage
plan schedule vs maintenance carried out on a monthly basis since this information is required
for the Annual Outage Plan Deviation Report being submitted to CERC.
3.7 LGBR for upcoming five months & TTC/ATC computations
3.7.1 All states were to furnish PSSE base case for December 2017 and the following was noted:
State 5 months LGB
Converged PSSE Base case
ATC/TTC Computation furnished to SRLDC
ATC/TTC Computation posted on SLDC website
Nodal Officer Status
134th OCC Minutes- 11.08.2017 Page 7
AP Being Furnished
Not submitted No Nil No
TS Submitted Yes
KAR Submitted(Non converged)
No
TN Submitted Yes
KER Submitted(Non converged)
Yes
3.7.2 In the Meeting, the following was noted: SRLDC informed that PSSE Base case submitted by KSEBL and KPTCL were not
converged. KSEBL informed that it was converged case and no communication had been
received by Nodal Officer of KSEBL regarding the non-convergence. SRLDC stated that they
would confirm and revert back.
KPTCL was requested to check-up the same.
APTRANSCO informed that they have started requesting the outage through Web Based
Outage Coordination Portal. SRLDC stated that they would confirm this.
SRLDC/SRPC pointed out that the demand being furnished for POC, ATC and LGB should
be in synch with each other. Different values could not be furnished for different
requirements. Node wise data should be as per the demand which is likely to be met from
various sources keeping in view the MOD etc. Any tendency to increase the internal
generation for POC computation needs to be avoided.
3.7.3 SRPC & SRLDC noted that converged PSSE base case was the base for calculation of POC
charges. All utilities were requested to submit the information regarding ATC/PoC in time so that
any errors would be minimized.
4 Availability and Requirement
4.1 APTRANSCO informed that they were not anticipating any deficits till December 2017. Bundled
power of 386 MW is considered from 21.07.2017 onwards. RTPP Stage IV (New) generation also
expected from October 2017(around 11 MU). Hinduja was not planned to be scheduled.
4.2 TSTRANSCO informed they would be in deficit in the coming months except August 2017. 12
MU/day is expected from Kakatiya TPS II for all the months except November 2017(4.08 MU).
Around 17-23 MU per month is expected from Singareni. Around 20 MU purchase from CSEB
was in place. Deficits, if any would be met through STOA/PX purchases. The deficit is increased
due to increase in requirement due to extension of 24 hours power supply to 3 districts & LI
Loads.
4.3 KPTCL informed that they would be in deficit till December 2017 except in August 2017. DVC
power of around 335 MU is considered in the availability. Around 1,000-1,300 MU Wind
generation is expected in August/ September 2017. Wind Generation is expected to come down
to around 700-800 MU for October/November/December 2017. Peak energy growth is considered
with 5 % increase from 2016-17
134th OCC Minutes- 11.08.2017 Page 8
4.4 KSEBL informed that they would be in nominal deficit for the coming months. It was noted that PX
purchases and Kayamkulam Power are not considered while calculating the availability.
4.5 TANTRANSCO informed that they are anticipating surplus from August 2017 onwards.
LTA/MTOA of around 800-1,900 MU is considered. Wind generation is expected to be around
2,000 MU in August 2017 and expected to be decrease gradually and in December 300 MU was
anticipated.
4.6 MS, SRPC stated that more emphasis needed to be put in by all the concerned utilities to finalize
a realistic load generation balance.
4.7 Reasons for demand -supply gap and its variation
4.7.1 This issue of furnishing the load shedding details in different heads along with the reasons by
states had been taken up in the NPC Meetings. MoP/CEA specifically needed the reasons for
load shedding like transmission constraints, distribution constraints, regulatory constraints viz the
power purchase not allowed beyond an agreed cost or quantum, natural calamities, tripping of
some of major transmission lines etc.
4.7.2 In the Meeting, SE (O), SRPC emphasized on the importance of this information to be submitted
to higher forums and requested all the constituents to furnish the information in the specified
format. Even if load shedding is zero a „Nil‟ report needed to be furnished on monthly basis.
5 REVIEW OF THE POWER SUPPLY POSITION
Grid Highlights
Frequency remained within IEGC range during July 2017 (49.90 - 50.05 Hz) for 77.37 % of
time. Average frequency for the month was 50.00 Hz.
Frequency remained below 49.90 Hz for 8.27 % of time during July 2017.
Frequency remained above 50.05 Hz for 14.36 % of time during July 2017.
Tamil Nadu had added 6.525 MW in windmill capacity (Private sector) during July 2017
AUFR, df/dt Joint Validation with states completed for Telangana and Andhra Pradesh as per
schedule.
Bhadravathi HVDC bypass Mock drill exercise successfully completed on 21st July 2017
Southern Region witnessed highest ever Wind generation of 198.87 MUs on 17th July 2017
Tamil Nadu wind generation touched Maximum of 102.58 MU on 4th August 2017
Kudgi Unit I COD was declared on 31st July 2017.
Andhra Pradesh, Telangana, Karnataka, Kerala & Tamil Nadu Imported 349 MU, 636 MU,
2.47 MU, 28.46 MU & 722 MU respectively intra-regionally through bilateral exchanges.
Andhra Pradesh, Telangana, Karnataka & Tamil Nadu exported 1218 MU, 81 MU 11 MU &
430 MU respectively intra-regionally through bilateral exchanges.
Utilities located in Andhra Pradesh, Telangana, Karnataka, Kerala Tamil Nadu & Puducherry
imported 278 MU, 812 MU, 256 MU, 134 MU 12 MU & 07 MU respectively through Power
Exchange.
Utilities located in Andhra Pradesh, Telangana, Karnataka, Kerala, Tamil Nadu, TPCIL, IL&
FS & SGPL Unit I exported 16 MU, 20 MU, 21 MU, 4 MU, 20 MU, 41 MU, 22 MU, 2 MU & 45
MU respectively through Power Exchange.
220 kV D/C line from 220 kV SS Uravakonda to 220kV SS Borampalli in Ananthapur district
69.6 Ckm was commissioned on 10.07.2017 by APTRANSCO.
134th OCC Minutes- 11.08.2017 Page 9
Samalkota in East Godavari Dist of existing 100 MVA was commissioned on
15.07.2017 by APTRANSCO with augmented capacity of 100 MVA
220 kV LILO line from 220/132 kV Huzurabad SS Circuit I from Oglapur Durshad in
Karimnagar district was commissioned on 19.07.2017 by TSTRANSCO.
220/13 2kV Huzurabad in Karimnagar Dist with 100 MVA capacity was commissioned
on 19.07.2017 by TSTRANSCO.
6 MAJOR ISSUES
6.1 Presentation by States on Operational Issues
In the Meeting, all the States/Entities submitted the operational issues / highlights (Annexure-
6A). MS, SRPC appreciated all the States/Entities for the efforts put by them in making the
presentation. He requested all entities to come up with operational/technical issues which need
attention and require deliberations in OCC forum separately. SRLDC requested that all entities
may kindly upload their presentation by 5th of every month so that SRLDC could compare with
their information/data which would help in better discussion/analysis of the issues. States had
been kindly requested to furnish the status of SCADA visibility of newly commissioned
Wind/Solar Generators to SLDC/SRLDC along-with LVRT Status.
6.2 Operation Of Hydro Power Projects In Peaking Mode
6.2.1 Forum of Load Despatchers (FOLD) and POSOCO had prepared a report “Report on
Operational Analysis for Optimization of Hydro Resources & facilitating Renewable Integration in
India”. MoP had constituted a sub-committee under Chairperson, CEA to study and recommend
the individual hydro power stations which can be operated to achieve peak load capacity. The
subcommittee has held three meetings with the concerned Hydro generating stations and
concluded that there was scope of about 2,000 MW additional power generation from hydro
station during peak hours. CEA vide letter dated 18.07.2017 (Annexure-6B) had advised that
the above issue would be discussed in the TCC/RPC meeting in all the five regions. POSOCO
vide letter dated 21.07.2017 (Annexure-6C) had furnished the agenda item on ‘Operational
analysis of Hydro Power Stations’. A presentation would be made by NLDC/RLDC.
6.2.2 In the Meeting, SRLDC informed that the present report had been prepared under guidance of
the MoP, GoI in order to supplement the different GoI initiatives for envisaged renewable
integration. In a large grid like India, the flexibility rendered by hydro generators viz. overload
capability, fast ramping & peaking support etc. has immense value for reliable, secure and
economic grid operation. A need for examination and analysis of existing hydro power resources
with a future road map to effectively harness them was felt to integrate 175 GW of renewable
energy by 2022. In this direction FOLD constituted a Working Group on Hydro to study, inter-
alia, the existing hydro power capabilities, tariff design, operating norms and constraints,
flexibility indices, scheduling practices, integrated operation of hydro stations haring common
134th OCC Minutes- 11.08.2017 Page 10
basin, pumped storage and communication facilities. About 80 % of the hydro power stations
around the country were surveyed totaling about 35 GW covering 150 Hydro stations. Huge data
analytic were carried out on the hydro power data for past 8 years with pattern analysis,
optimization solver for valuation and correlation with demand. Flexibility metrics for each hydro
power station have been evolved and assessment was carried out for its ranking and
optimization on a Pan - India basis.
6.2.3 SRLDC made a presentation(Annexure-6D) on the same and summarized suggestions of the
FOLD WG for optimized usage of Hydro resources for large scale integration of renewables as
follows:
Valuing flexibility of hydro stations though enabling regulatory frame works.
Operationalization of existing PSP Units in pumping mode.
Bringing hydro power stations under ancillary services.
Incentivizing system support services like black start & reactive support.
Transmission planning to factor in harnessing full flexibility of hydro capacity.
Robust Communication infra-structure between hydro stations and LDCs.
Coordinated scheduling and & dispatch of hydro stations.
Multi part tariff of Hydro Power
Need for inflow & Silt forecasting.
Recognizing flexibility as a need for new hydro projects & renovation of existing ones.
Revisiting the traditional hydrological constraints in hydro dispatch.
6.2.4 The constituents views are as follows:
I. Andhra Pradesh
AP has Hydro Capacity of 1720 MW.
Lower Sileru basin has perennial source of water from Balimela. It can be operated on
RTC basis and be maximized during peak hours. Maximum generation of 450 to 470 MW
only can be put on bars during peak hours at Lower Sileru basin though there is a
capacity of 725 MW as there is a limitation for evacuation of maximum generation at the
above station as two single circuits namely 220 KV Lower Sileru - Bommuru and Upper
Sileru -Pendurthy get over loaded because KTPS is a strong generating source.
Generation at Lower Sileru basin is used in other hours also for Load Generation Balance.
If generation at Lower Sileru basin is considered for peaking only, then AP will not be able
to utilize the quota of water and stands to lose considerably. 220 KV abandoned line from
Lower Sileru- Rampachodavaram will be revived.
Srisailam generation (770 MW) is generally utilized in peak hours depending on the water
releases by Irrigation Department.
Machkund generation is used on RTC basis to the fullest available Capacity.
NSR tail pond generation is used depending on the water releases.
II. Telangana
The total installed capacity of Hydro stations in the State is about 2416.91 MW.
134th OCC Minutes- 11.08.2017 Page 11
All the above projects are multipurpose projects. Out of which Srisailam LBPH has a
generation capacity of 900 MW and Nagarjunasagar has a generation capacity of 815.60
MW. The power generation from these projects are dependent on the inflows and the
water releases given by Krishna River Management Board.
Hydel generation will be carried out only during this period (days) to match the discharges
given by KRMB. However, during this period as there is flexibility in operating hours,
generally hydel generation is planned during peak hours.
III. Karnataka
It cannot be generalized that Hydro stations are “Must Run” stations.
Scheduling and generation planning of storage type Hydro stations is for the full year
which is one “water cycle” year.
Scheduling of such plants is dependent on the storage content in the reservoirs at a
particular instant of water cycle year.
Sharavathy is used for RE balancing as well as for Load Balancing purposes.
In case of sudden forced outage of any embedded or ISGS conventional generators,
Sharavathy units which are of Pelton type quickly respond and manage the deviation of
the state control area.
Hence for control purposes, not all units may be operated all the time. For instance, only
4 of the 10 Sharavathy units may be operated at partial loads to manage sudden
variations up to December.
Karnataka has sizeable RE generation including Solar. Solar generation has typical ramps
which need to be suitably balanced. Balancing of uncertain with drawl and injection of
wind power.
Further, in case of DSM variations due to RE intermittency, hydro generation is required
for balancing needs.
State also has large load variations due to weather changes etc. For instance Karnataka
has a sudden variation of about 2,000 MW load in case of rains. Peak demand of the
state varies between 4,500 to 10,500 MW. To take care of such wide variations in the
demand due to various reasons, hydro generation is optimized.
Typically around 5% carry over in the Hydro storage content is planned at the end of the
water cycle year due to silt.
Generally around 24 MU per day of generation (1,000 MW RTC) is planned during the
period January to April, which is typically high demand season where base demand
increases by 1000 to 1500 MW.
However, presently with the current storage position of 41% which is not satisfactory, only
2 MU per day of generation is planned in the balance water year period.
Thus there cannot be static operating principles for hydro stations. Based on the inflows,
Grid operating conditions etc., system operator will take a call on the generation levels up
to the end of the water cycle year.
Run of the river type of hydro generation may be considered as must run stations.
However, stations with huge storage dams, may become “must run” during main
134th OCC Minutes- 11.08.2017 Page 12
dam/balancing reservoir spilling conditions which are of seasonal nature. This cannot be
said for operating conditions throughout the water cycle period.
Major stations like Sharavathy, Nagjheri and Varahi are the only fast responding balancing
resources available in the state.
Typically high demand conditions prevail in the Southern Region during the period
January to April. During Inter-regional corridors congestion period and adequate ATC for
power purchases may not be there. At this juncture, hydro stations are pressed into
service for maintaining the power system stability in the SR region.
IV. Kerala
The observation by POSOCO that a number of hydro stations particularly in the state
sector are not being operated in peaking mode and is sub optimal was strongly refuted.
KSEBL pointed out that the report has not been shared so far by POSOCO. There had
been no proper consultation with SLDC / scheduling agencies in Kerala so far. SRLDC
informed that the details were collected through a questionnaire. KSEBL remarked that
the questionnaire was not comprehensive to furnish the required details. He further
pointed out that the presentation made by POSOCO had some factual errors like the
number of stations intended as electricity producing only. The distinction could be in the
ownership of the reservoirs, but even a DISCOM owned reservoir may have to be
operated considering social requirement sometimes. The operating principles in different
control area could be different. The following aspects are considered by Kerala in
scheduling hydro power:
The hydro availability depends on the monsoon and hence the averaging over years is not
correct.
The spatial distribution of monsoon is critical in scheduling generation from hydro stations.
Generally, considering the rate of inflow, anticipated rate of inflow, storage capability of
the reservoir and the depletion capability of the generating station, safe reservoir levels
are worked out. This is a dynamic computation on account of the dynamics of the
parameters involved.
The guidelines for operators in SLDC to schedule hydro generation is issued depending
on the estimated demand, present water level, safe reservoir level and other obligations in
water discharge even if the reservoir is not identified as irrigation reservoir. Typical cases
occur when the monsoon is poor.
In general, merit order dispatch is followed for scheduling power. For decision making, the
price of power is taken for merit order, especially in the case of hydro scheduling. The
price of water in each reservoir is computed considering the storage capacity of the
reservoir and the capability of variability of generation. Normally, the price of hydro is
taken as zero when the reservoir is in spill threat. When the water available in large
reservoirs is less than the safe level, the price is the cost of the replaceable energy for the
entire water year. These are taken after detailed statistical analysis.
The concept of peak shaving with hydro was the concept followed earlier. However, with
the power from open market becoming significant, the rate discovered during the peak
during some part of the year may be even less than the cost of the power purchased from
the market during other-than -peak hours during summer months. Hence, the hydro
generation may not reach maximum capability on several days.
134th OCC Minutes- 11.08.2017 Page 13
Hydro generation is planned so as to provide the marginal quantity required for meeting
the demand. If for any reason thermal generation reduces or if there is any curtailment on
transmission corridor resulting in reduction of power purchase on daily basis, the hydro
power is substituted to meet the demand without restriction. The spinning reserve is also
provided on hydro as there are no thermal generators in Kerala and the power other than
the hydro generation is scheduled through interstate tie lines. The delay in obtaining
changes in schedules from SRLDC necessitates management of spinning reserve from
hydro stations. This also contributes to the fact that the hydro generators seldom achieve
maximum generation including during peak hours.
The hydro generation in Kerala is mostly owned and operated by KSEBL, the distribution
licensee. The generation is thus scheduled by KSEBL on the basis of commercial
considerations and economy of operation.
When there is acute shortage of water in the reservoirs, there are instances when the load
shedding has been implemented during day time. In some cases, the load shedding may
be during peak hours. This depends on the availability of water, expected inflow and the
energy savings to be obtained. The decision is again linked with economy of operation
and commercial considerations.
The peaking support from hydro sources for national benefit and to meet the ramping of
renewables cannot be considered in the operation if it collides with the operational
efficiency of the control area. The same can be considered for operation if there is a
compensating balancing market, when the merit order may get altered. Extension of
ancillary market to the state distribution licensees for making use of the hydro capability
for external causes on commercial basis can also be considered, which could be purely
optional for such utilities.
The scheduling is also affected by technical reasons such as reactive power management
in Kerala. During very low demand conditions and very high demand conditions, operation
of hydro stations at some particular generation level may become necessary to control the
voltage at some nodes. Such operation may require higher generation during off peak
hours, which may have to be compensated by reduced generation during evening peak
hours. Some of the pondage hydel stations may be available only for about 3 -4 hours a
day during summer in a period of 24 hours making their operational hours stiff. Thus,
there could be reduction in generation from some stations during peak. These are arrived
through experience supported by statistical figures and it is not right to assume that the
operations are non-optimal without studying the matter in deep.
KSEBL pointed out that electricity is a subject under the concurrent list of the constitution
and propositions like coordinated scheduling and dispatch etc can be considered only
after detailed policy deliberations and that too through complementary commercial
mechanisms. To a comment that the proposition of POSOCO can be limited to hydro
ISGS only, KSEBL pointed out that there are no hydro ISGS in SR, but even ISGS are
owned by the beneficiaries to the extent of the share allocated to them as long as the
proportional fixed charges are paid and hence the right of scheduling rests with the
beneficiaries to manage their economy of operation. KSEBL also apprehended on some
of the conclusions pointed out by POSOCO such as most of the hydro generators in SR
are of Pelton wheel type, which is grid friendly, multiple start-stops is economical,
definition of capacity utilisation factor for hydro stations as ratio of average generation per
134th OCC Minutes- 11.08.2017 Page 14
day with installed capacity, averaging of generation for the past years for arriving at the
possible generation etc.
V. Tamil Nadu
The hydro generation is mostly used for peaking power. However, it is only the spinning
reserve available for Tamil Nadu state to contain the Intra-day DSM from time-to-time due
to Intermittent variation of RE power.
The hydro generation is subject to reservoir level. For the past 2 years i.e., 2015-16,
2016-17 and current year also, the southwest monsoon is not active in the Southern
Region as per the prediction of IMD. Storage level is lower by 28% as on date when
compared with previous year.
The hydro generation is regulated for the whole year especially to manage the summer
loads.
There is no scope of hydro capacity improvement without new hydro project in Tamil
Nadu.
Hence the operation of hydro Stations are in the purview of states only
6.2.5 It was also noted that as expressed by the states, National Peak and State individual peak may
not necessarily coincide. States may be concerned about meeting state peak rather than
National/Regional Peak. The hydro generation seem already being optimised by the SLDCs.
Hydro in merit order is considered based on the price of the replaced energy in the water cycle
and not on the basis of the cost. Operation of Hydro in NR/NER cannot be compared with SR
Hydro. It was noted that in the presentation all the Hydro stations are identified as multipurpose
which may not be correct. Varahi, Sharavathi and Nagjheri stations as informed by KPCL are
purely for Electricity generation only. For RE balancing as well as for Load Balancing purposes
the only available source is Hydro. Analysis is purely based on the past data whereas scheduling
of such plants is dependent on the storage content in the reservoirs at a particular instant of
water cycle year. All the units will not be available during Peak Period.
6.2.6 After deliberations it was concluded by all the states that the peaking support from hydro sources
for national benefit is also to be viewed vis a vis requirements of the control area. The same
can be considered for operation if there is a suitable product introduced under a commercial
mechanism.
6.2.7 It was noted that States views will be put up in forthcoming TCC/SRPC Meeting which is
scheduled on 21st and 22nd August 2017 as desired by CEA. SRLDC was requested to come
out with specific suggestions/way forward since RPCs are advised to discuss the same as a
regular Agenda item in Monthly OCC Meetings as well as needed to be discussed in TCC/SRPC
Meetings.
134th OCC Minutes- 11.08.2017 Page 15
6.3 Load required for conducting PG tests and other critical activities in the units/requirement of change of technical minimum by generators
6.3.1 NTECL Vallur vide E-mail dated 29.07.2017 (Annexure-6E) had submitted the following regarding
Technical Minimum
Prior to 15.05.17, the technical minimum was entered by generators in the SRLDC
scheduling programme.
From 15.05.17, the technical minimum of generators are being entered/selected by SRLDC.
This is causing problems to the generators as generators are not in position to change the
technical minimum when they are forced to run the machines at higher load on account of
critical problems in the machine.
6.3.2 NTECL requested/desired that:
There should be a mechanism to provide schedule for conducting PG tests and other critical
activities.
The generator should be able to change the Technical Minimum when in requirement.
6.3.3 In the Meeting NTECL informed that by March 2018 many tests are required to be carried out in all
the NTECL Units. At present, the generators are not in a position to change the technical minimum
and they are forced to run the machines at higher load. On account of critical problems in the
machine it was requested that there may be mechanism to provide schedule for conducting PG
tests and critical activities.
6.3.4 SRLDC expressed the views as follows:
Needs to be intimated to the beneficiaries well in advance
Prior consent of beneficiaries & approval in forums like OCC need to be obtained.
As per regulations 55 % of technical minimum is being followed.
6.3.5 SE (O), SRPC suggested that NTECL may furnish the basic plan/schedule of the tests well in
advance i.e at least one week before and concurrence may be sought from all the states.
6.3.6 After deliberations, all the States agreed that they would mostly ensure the schedule as required by
ISGS provided ISGS inform their testing schedule well in advance (around one week). Any
rescheduling of tests due to urgent needs would be communicated to ISGS at least two days in
advance.
6.3.7 NTECL informed that minimum load was required for one unit at a time. They are planning the PG
tests for Unit I from 17th August 2017 onwards for 3 days. The final date would be intimated to all
the States/SRLDC and coordinated accordingly.
6.4 Overdrawal by SR constituents during morning peak
6.4.1 SRLDC vide letter dated 05.07.2017 had observed that during morning hours of the day there is
consistent and simultaneous over drawal of power by all the SR constituents resulting in large inter
regional deviation to the tune of 1,000 MW, causing violation in SR import ATC limits and high line
134th OCC Minutes- 11.08.2017 Page 16
loading in trunk lines including Vemagiri-Gazuwaka S/C 400 kV line beyond thermal limits. At 06:00
hours of 05.07. warning messages were issued by NLDC to all Regional Entities. NLDC letter
dated 04.07.2017 was also enclosed with SRLDC letter. SRLDC had expressed concern over the
simultaneous overdrawal leading to ATC violation of IR links and loading of Vemagiri-Gazuwaka
S/C 400 kV line beyond thermal limits.
6.4.2 SRPC vide letter dated 19.07.2017 had taken up certain issues in this regard with SRLDC based
an analysis carried out for instances of overdrawal more than 1,000 MW. It was requested that the
above issues may kindly be examined and SRPC be informed accordingly.
6.4.3 SRPC had made an analysis with regard to inter-regional flows vis-vis RRAS schedule for the
period from 01.04.2017 to 09.07.2017. Based on the observations, SRPC vide letter dated
20.07.2017 had taken up certain issues regarding issuance of RRAS instructions with NLDC.
6.4.4 SRLDC vide letter dated 27.07.2017(Annexure-6F) had furnished the following in response to
SRPC‟s letter dated 19.07.2017:
Overdrawal: Most of the over drawl instances are at the brim of load change over‟s which
indicates clearly the need for review of load staggering by the individual states as well as
among the states. These overdrawals are observed subsequent to blocks of huge under
drawals which reflects sudden changes in drawl forcing threat of tripping of elements. The
details of drawal pattern, expected deviations, reasons for deviations and action
taken by the states are to be collected from states and to be discussed in the OCC
Meeting.
Schedule Exceeding DC: ISGS stations sell the states surrendered power through power
exchanges and subsequently reduce the DC due to reasons like coal problem, auxiliary
failure issues, tripping of units etc. This nature of instances forces non-availability of RGMO
support from such machines. The station may sell the surrendered power by keeping
certain margin for operational flexibility. This issue may also be deliberated in the
OCC Meeting of SRPC and finalize a suitable scheduling mechanism.
RRAS: RRAS is triggered up and down by NLDC depending on demand trends/forecasting
and real time system requirements. RRAS schedules are followed by all the generators as
per the margin availability and analyzing the original OD/UD for a few intermittent blocks
during RRAS may be misleading. Demand forecasting by constituents with better accuracy
on block to block basis may facilitate fine tuning the RRAS instructions.
6.4.5 SRLDC vide message dated 26.07.2017(Annexure-6G) had informed all concerned that „There
was a continuous overdrawal by SR constituents and NEW-SR drawal is crossing ATC value from
past one hour. It is requested that all constituents maintain schedule. Generators are requested to
not under inject and maintain schedule. Kindly take necessary action at the earliest in order to
reduce NEW-SR drawal and the drawal is maintained below ATC‟.
6.4.6 Further SRLDC vide letter dated 31.07.2017(Annexure-6H) had taken up the issue of over drawal
from Grid during morning hours. It is again requested to AP to exercise optimum scheduling and
134th OCC Minutes- 11.08.2017 Page 17
adhere to the drawal schedule at all times. Considering the magnitude of RE penetration the
conventional generation may be flexed quickly for optimum scheduling.
6.4.7 In the meeting, SRLDC informed that they had addressed to all the constituents of Southern
Region highlighting the issue regarding the over drawal in the morning hours, which was leading to
inter regional deviation of more than 1,000 MW. It was observed from the analysis of over drawl of
SR Constituents that most of the instances are at the brim of load change over and there is a need
for review of load staggering of individual states. Hence to avoid these instances, SRLDC vide E-
mail dated 6th August 2017 had requested all constituents to analyse the drawl pattern, deviations
and actions taken by Constituents to control the deviations etc for the instances and present the
same in the forthcoming (134th) OCC meeting of SRPC.
6.4.8 APTRANSCO informed that the incidents were due to large wind variations. SLDC had already
advised DISCOMs to cut the agricultural loads during morning 4 to 7 hours. Upper Sileru and
Lower Sileru Units tripped during that period. At VTPS, generation was affected due to wet coal.
6.4.9 SRLDC informed that the issue was sill prevailing and daily about 500 MW variation is observed.
6.4.10 SE(O), SRPC requested APTRANSCO to take immediate action in this regard and furnish a report
on the action taken. He emphasized the need for further analysis of the events and identify the
reasons for the events and actions to be initiated for curtailing those. Deviations which are passed
on to Regional Grid should be avoided and taken care of.
6.4.11 SRLDC observed that thermal generation cannot be reduced from 500 MW to 0 MW in few
minutes but solar can ramp up from 0 to 500 MW in few minutes. Ramping of load and matching
generation ramp considering any intermittency of solar was vital. APTRANSCO was requested to
review this aspect also.
6.5 Delay in restoration of Bhadravathi Poles I & II
6.5.1 Black Start Mock Exercise for availing start up power from Western Region through HVDC AC
bypass at Bhadravathi in the event of a black out and start the units at NTPC Ramagundam was
carried out on 21.07.2017. The report is at Annexure-6I. Observations on effectiveness of Mock
Drill have been listed out in the Report. It was observed that while normalization of mock drill
exercise, HVDC poles at Bhadravathi were not able to come into service as per instruction. It was
felt that these types of technical issues needed to be addressed diligently to avoid repetition of
same in real time.
6.5.2 In the Meeting SRLDC listed out the recommendations/observations as follows:
Bay and element numbering as per standards may be followed in all the substations.
Delay in connecting loads was observed at 220KV Jagityal station. This should be taken care
because in emergency, every minute would be crucial.
134th OCC Minutes- 11.08.2017 Page 18
Equipment or measuring meter healthiness status should be available with operator and
alternative meter should be readily available to use in case of emergency.
Up-gradation of analog displays by digital displays may be considered for ease of operation.
While normalization of mock drill exercise HVDC poles at Bhadrawati were not able to come
into service as per instruction. These type of technical issues to be addressed with diligence
to avoid repetition of same in real time.
High voltages were observed during mock drill exercise (during previous mock drills also ), for
regulating the voltages connecting nearby substations loads are compulsory before extending
the start up supply to NTPC Ramagundam. In view of this, it is recommended that TS SLDC
and TSTRANSCO should always be ready to connect the loads of 120-150MW before
extending the supply to NTPC Ramagundam in case of blackout, type of loads and availability
of the loads should be readily available with the operator in order to achieve faster restoration.
6.5.3 Efforts of NTPC/TSTRANSCO/SRLDC/NLDC/PGCIL were placed on record.
6.5.4 On a query from SRPC regarding the delay in bringing back the poles, SR I informed that it had
reportedly due to some control card failure and which had since been rectified.
6.6 Wind Generation loss at Uravakonda during Jammalamadugu-Uravakonda line charging
6.6.1 SRLDC vide letter dated 14.07.2017 (Annexure-6J) had brought into notice about the wind
generation loss at Uravakonda during Jammalamadugu - Uravakonda line charging. There was
loss of wind generation in the order of 600 MW while closing the 400 KV Uravakonda –
Jammalamadugu lines. Some of the instances observed during real time operations are given
below:-
Sl.No Date Time Wind Gen.Loss
1 09-07-2017 21:25 600
2 10-07-2017 20:36 634
3 11-07-2017 06:22 300
4 11-07-2017 16:40 543
5 12-07-2017 12:08 600
6.6.2 Oscillations were also observed in 765 KV Raichur-Solapur line flows along with fall in grid
frequency. SRLDC expressed concern that sudden generation loss of such large quantum would
affect the smooth SR/All India grid operation and requested APTRANSCO that this matter may
please be taken up with the wind generators to resolve it at the earliest.
6.6.3 It was noted that there may be some regulatory provisions which could prevent MVAR absorption by
the RE generators. APTRANSCO was requested to look into the issue. In addition, HVRT set
points and the tap positions of the generators could also be ascertained / optimized.
6.6.4 In the meeting, SRLDC informed that there was some setting issue in Suzlon make turbines which
had been rectified.
134th OCC Minutes- 11.08.2017 Page 19
6.7 High Voltage in Kaiga Bus
6.7.1 SRLDC vide letter dated 15.06.2017 had brought out the issues regarding high voltages prevailing
at Kaiga. SRLDC had stated that with the onset of Monsoon, SR grid is experiencing high voltage
throughout the grid and in such a scenario, there is a need for proactive action by Kaiga GS.
Measures such as resolving MVAR absorption of Kaiga units with the OEM and commissioning of
2x125 MVAR reactors at Kaiga may be completed on emergency basis. It was noted in the 133rd
OCC Meeting that most of the issues were pending from Kaiga GS end, like injection of MVAR from
Unit-3 & 4 (they were absorbing earlier), unilateral change of the tap, delay in commissioning of the
new reactors (though the issue had been highlighted since long), non-sharing of the OEM report
restricting the MVAR absorption and no action on the suggestion of utilization of the spare regional
reactor. It was agreed that a team from SRLDC, SRPC and constituents would visit Kaiga GS for the
MVAR testing on 04.08.2017. Kaiga GS representative had stated that after taking the management
approval, the dates would be confirmed.
6.7.2 In the Meeting, KGS representative informed that two reactors are expected to be commissioned by
December 2019. POA is placed for both reactors and bays (with gantry and breakers). MVAR
testing date will be intimated after discussing with Senior Officials.
6.7.3 After deliberations, it was decided that the MVAR testing may be conducted on 29th August 2017 for
Unit IV of KGS. KGS was requested to coordinate and make necessary arrangement for the same.
6.7.4 On a query, KGS representative informed regarding the spare reactor that there are space
constraints. It was noted that PGCIL also may be present at Kaiga on 29th August 2017 and the
team could also examine the feasibility of space for spare reactor.
6.8 High Voltage in Telangana
6.8.1 In the 133rd OCC Meeting SRLDC had highlighted the high voltage issues observed in Telangana
Control area. It was pointed out that M/s Singareni units were absorbing only upto 50 MVAR. It could
go upto 150-180 MVAR in line with other machines of similar capacities. It was noted that the GT
taps were most likely at 420 kV which were to be brought down to 400 kV in steps. MVAR Capability
of Singareni Units for combating high voltage was presented by SRLDC. TSTRANSCO had
informed that they had taken up the issues with M/s Singareni and had assured GT tap change
would be taken up.
6.8.2 In the Meeting, SRLDC informed that as agreed in the 133rd OCC Meeting MVAR testing for
Singareni Units was carried out on 3rd August 2017. The following observations were noted:
GT tap position is set at 420 kV, due to which the lower limit of generator terminal voltage (19.5
kV) was hitting early. With these conditions -53 MVAR at 600 MW load -78 MVAR at 460MW
only could be tested.
134th OCC Minutes- 11.08.2017 Page 20
Under normal conditions the generator terminal voltage was observed around 20.4 kV only
(Rated 21kV).
Lagging side test was successful (up to 296 & 293 MVAR could be tested)
The generator is requested to change the GT tap position to lower levels.
6.8.3 SE(O), SRPC recalled that whenever new units are commissioned the tap position should be kept at
400 kV level. He requested TSTRANSCO to take up immediately with Singareni TPS to bring the
Tap position at 400 kV level. TSTRANSCO informed that they have already taken up with Singareni
TPS and during next opportunity tap position will be changed.
6.8.4 It was observed that facility of On Load Tap Changers may be made use off in such situations and
should not wait for the shutdown of the units.
6.9 Optimum harnessing of RE in Southern Region
6.9.1 A Meeting was held on 10th February 2017 in MoP on matters relating to optimum harnessing of
Renewable Energy Integration in SR without endangering Grid Security. A number of actionable
points had been finalized in that Meeting and time lines for compliance of the same also had been
specified. SRPC vide letter dated 02.05.2017 had requested the concerned utilities that the matter
may kindly be arranged to be reviewed and urgent action arranged wherever necessitated. A
Special TCC Meeting was also convened on 20th May 2017 in SRPC, Bengaluru.
6.9.2 SRLDC had conducted a Capacity Building Workshop on STOA procedures on 19.05.2017 in
compliance. A Special Meeting of SRPC Members of the constituent states was held on 31st July
2017 at Hyderabad. Based on the discussions in the Hyderabad Meeting, a draft Overarching
Agreement was prepared and also circulated. It was proposed to sign the Overarching Agreement in
SRPC Bengaluru on 17th August 2017.
6.10 Constitution of “Sub-Group under Technical Committee for Implementation of Frame work on Renewable at the state level”
6.10.1 CERC vide their communication dated 02.05.2017 had informed that a Technical Committee under
the Chairmanship of Member, CERC, Shri A.S.Bakshi was formed at the direction of Forum of
Regulators (FOR) in November, 2015. This Committee comprises of Technical Members of State
Commission of renewable rich States, viz. Tamil Nadu, Gujarat, Rajasthan, Maharashtra, Andhra
Pradesh, Karnataka and Madhya Pradesh. The objectives of the Committee include facilitating
implementation of Regulations for Forecasting, Scheduling and Deviation Settlement at the State
level, implementation of ABT framework and Ancillary Services in member States, among others. It
was decided that Sub-Groups be constituted in the Northern Region, Western Region and
Southern Region (the three RE rich regions) headed by the Member Secretaries of the respective
Regional Power Committees (RPCs) to examine this issue. This Sub-Group shall inter-alia
examine the feasibility and modality of cooperation among states in the respective region for
134th OCC Minutes- 11.08.2017 Page 21
ensuring optimum utilization of generation resources with least cost options for balancing across
the region. The Sub-Groups are to submit their findings before the Technical Committee at the
earliest.
6.10.2 The Sub Group Meeting was convened on 07.06.2017 at SRPC Bangalore and the Minutes of the
Meeting are available at SRPC website. A meeting in this regard was scheduled for 18.08.2017 in
CERC.
6.11 Terms and Reference for the proposed study on Renewable Integration
6.11.1 It was noted that in the 31st SRPC Meeting held on 25th February 2017
TANGEDCO/TANTRANSCO had agreed to take up the matter of funding this study by RE
Developers with them. SRPC vide letter dated 03.05.2017 had requested TANTRANSCO that
the matter regarding possible funding of the consultancy may kindly be arranged to be taken up
with RE Developer Associations.
6.11.2 Subsequently TANTRANSCO vide letter dated 08.06.2017(Annexure-6K) had informed replied.
The issue was scheduled to be deliberated in 31st TCC/32nd SRC meetings.
6.12 Compliance of CEA Regulations for Grid connectivity of Renewable Energy Sources
6.12.1 CEA vide letter dated 12.04.2017 had informed that in compliance to the Clauses 6(3) and
6(4)(b) of Central Electricity Authority (Technical Standards for Connectivity to Grid) Regulations
2007 and Central Electricity Authority (Technical Standards for Connectivity of the Distributed
Generation Resources) Regulations 2013 notified on 30th September 2013 it is obligatory for all
the grid connected renewable generators to provide necessary facilities for data-communication
and data-storage and other parameters as may be stipulated. The said CEA Regulations also
places onus on the generating plants including renewable to coordinate with appropriate licenses
on issues including but not limited to protection safety and metering.
6.12.2 With the above perspective as emerging from the CEA Regulations in force, the SLDCs are
requested to take up the matter with all the renewable generators to ensure transfer of
data to the appropriate Load Despatch Centre, so that the real time generation data is
available with them for centralized monitoring. It was also requested that to indicate the
present status in this regard and the action plan with definite time frame to ensure real time data
telemetry from all the grid connected Renewable Generators/Plants to the SLDCs.
6.12.3 CEA had requested SRPC to take up the issue with the concerned SLDC/utility operating the
SLDC and desired that this may be kept as an agenda item for OCC Meetings for periodical
review of the status of real time data telemetry from all the Grid Connected Renewable
Generators/Plants to the SLDCs.
6.12.4 Subsequently CEA vide letter dated 08.05.2017 had enclosed MoP letter dated 06.04.2017 on
the above issue. SRPC had informed that this matter had been deliberated in the Special TCC
134th OCC Minutes- 11.08.2017 Page 22
Meeting held on 20.05.2017. The minutes of the Meeting are available at SRPC website. States
were requested to take immediate action as per the Meeting Minutes.
6.12.5 In the Meeting, it was noted that CEA had conducted a Meeting on „Receipt of online operational
data in real time mode at SLDC from renewable energy generation sources (RES) and related
issues‟ at New Delhi on 28.06.2017 (MoM dated 14.07.2017 enclosed as Annexure-6L). The
following was concluded in the Meeting.
All states should have in place urgent time bound plan to ensure availability of 100%
operational data in real time mode at the SLDC/RLDC/NLDC. It was decided that the
respective states would submit weekly reports of data communication status to
CEA as well as to respective RPC/RLDC and NLDC.
Till the time, State Regulations are not in place. CERC (Communication System for inter-
State transmission of electricity) Regulations, 2017 shall be followed.
6.12.6 it was noted that a Special Meeting was held in CEA on 11.07.2017 under Chairmanship of
Member (Planning), CEA to discuss the modalities for devising suitable framework for National
Level Data Registry for electricity generating units so as to have easy availability of their
generating capacity and other details. Subsequently CEA vide letter dated 19.07.2017
(Annexure-6M) had communicated the Minutes of the Meeting.
6.13 Ramp down/up during sudden solar increase/decrease during morning/evening
6.13.1 In the 129th OCC Meeting SRLDC expressed concern regarding the ramp down/up during
sudden increase/decrease during morning/evening hours. SRPC/SRLDC had pointed out that
Solar Capacity would be coming up very intensively in coming six months and SR should be
ready with contingency plan for managing the LGB during the solar ramp up/ramp down period.
6.13.2 SRLDC had presented the typical ramps of Solar for the 250 MW NP Kunta plant as given in the
table below:
Ramp
No
Time
blocks
Approx. Time
(Hrs)
Average
ramp
(MW/Block
)
Ramp rate as
% installed
capacity
Remarks
1 26 to 27 6:15 to 6:45 + 5.5 2.2 % Slow ramp up
2 28 to 38 6:46 to 9:30 +12.5 5.0 % Steep ramp up
3 39 to 45 9:31 to 11:15 +6.1 2.4 % Slow ramp up
46 to 53 11:16 to 13:15 2 to 3 1% to 1.5 % Generation more or less same
4 54 to 58 13:16 to 14:30 -5.4 -2.2 % Slow ramp Down
5 59 to 69 14:31 to 17:15 -12.5 -5.0 % Steep ramp Down
6 70 to 73 17:16 to 18:15 -6.3 -2.5 % Slow ramp Down
6.13.3 It was noted that the Ramps could be used for the balancing/reserve planning by the entities.
The installed capacity could be scaled.
134th OCC Minutes- 11.08.2017 Page 23
6.13.4 This exercise would assume significant importance as the Solar trajectory was very high and
would form large component of the RE / installed capacity of the states. This would be apt time
to use such tools for better load generation, balancing / reserve assessment / planning.
The following were noted in the 133rd OCC Meeting:
APTRANSCO had informed that 220 MW of GVK plant was being used for providing the
flexibility, APTRANSCO agreed to share the agreement details on the technical /
commercial for better understanding of the other states. Pump storage plant at Upper
Sileru had been suggested.
TSTRANSCO had informed that they were maintaining spinning reserve to meet the
deficit and they had sufficient reserve in the backing down direction also. The purchase
planning was taking into consideration various factors like Solar ramps, purchase pattern
of the embedded customers, demand variation features, overlap of groups, demand
shifting to Solar generation etc.
TANTRANSCO had informed that whenever hydro was available, they were flexing the
hydro else, the majority variations were being met by regulating the thermal generation.
KPTCL had informed that they were also optimizing the demand shifting with Solar
generation and recently, Discoms IP loads were shifted to match the solar etc.
6.14 Shifting of PMU from GMR-Vemagiri to NP Kunta-Status
6.14.1 In the Meeting APTRANSCO informed that instead of shifting PMU from GMR Vemagiri to NP
Kunta, it may be shifted to Uravakonda.
6.14.2 MS SRPC informed that Protection Committee had agreed for NP Kunta and actions had been
initiated and the requirement at Uravakonda may be considered subsequently.
6.15 Implementation of CERC (Communication System for Inter-State Transmission of Electricity) Regulations, 2017
6.15.1 CERC had notified the Central Electricity Regulatory Commission (Communication System for
Inter State Transmission of Electricity), Regulations, 2017 Dated 15th May 2015. These
Regulations shall come into force w.e.f 01.07.2017. A number of actionable points are there for
the entities/stakeholders.
6.15.2 In the Meeting, SE(O), SRPC requested all the entities/stake holders to initiate actions to comply
the directions/recommendations in the Regulations.
6.16 Confirmation for the indicated plan for FGD/Phasing Out Plan for implementation of new Environmental Norms for Thermal Plants issued by MOEF & CC
6.16.1 In regard to Phasing Plan for implementation of new Environmental Norms for Thermal Plants,
issued by MOEF&CC, CEA has firmed up the FGD phasing plan and uploaded on its website.
Phasing Out Plan confirmation are not received from most of the generators. It was requested
that all the concerned to kindly furnish the information at the earliest which would be forwarded
to CEA.
134th OCC Minutes- 11.08.2017 Page 24
6.16.2 Chairperson, SRPC vide letter dated 24.05.2017 had put forward to Secretary-Power, MoP that
during discussions in the 31st SRPC meeting held on 25.2.2017, regarding implementation of
revised environmental norms, it was suggested that some funding either from PSDF or any
other fund could be kindly sought from the GoI to meet the stipulated revised environmental
norms. It was requested that the kind attention of MoP may be bestowed on this issue of
funding either from PSDF or any other fund to meet the stipulated revised environmental
norms.
6.16.3 Subsequently CEA had requested to furnish the confirmation regarding the FGD installation of
NLC Units. NLC vide letter dated 18.08.2017(Annexure-6N) has furnished their views. It was
informed that consultant had taken the field measurements and recommendations are awaited.
6.16.4 In the Meeting SRPC requested all the generators to keep CEA appraised of the developments
in FGD/Phasing out plan.
6.17 State-wise allocation of 540 MW power from RGPPL to Railways
6.17.1 CEA vide letter No. 5/AI/CSA/GM/2017 dated 22.03.2017 had enclosed MoP Order No.
4/22/2011-Th-Vol-III) dated 17.03.2017 in which 540 MW power from Ratnagiri Gas and Power
Private Limited (RGPPL) has been allocated to Indian Railways. Allocation to SR States (out of
540 MW) would be as under:
State Nodal Railway Maximum load in MW after availability of corridor between NEW Grid and SR*
Telangana SCR 50*
Tamil Nadu
SR 100*
date of effectiveness subject to availability of transmission corridor as per assessment of
CTU.
Subsequently CEA vide letter dated 22.05.2017 had endorsed MoP letter dated 18.05.2017 in
which 35 MW of power is allocated to KPTCL (SR). CEA vide letter dated13.06.2017 had
communicated the allocation to Karnataka with slight modification in the conditions.
6.17.2 TSTRANSCO and TANTRANSCO had been requested to conduct Meeting with Railways for
ensure availability of infrastructure, firmed up scheduling mechanism etc.
6.17.3 Subsequently the following was noted:
CTU vide letter dated 20.04.2017 & 08.06.2017 had informed that ATC to SR from new Grid
has already been allocated to LTA/MTOA applicants for transfer of power to constituent states
of Southern Region including Telangana, Tamil Nadu & Karnataka. Transfer of 150 +35 MW
can be affected upon commissioning of upcoming Nizamabad-Maheswaram 765 kV D/C line,
which is likely to be commissioned by October 2017.
TSTRANSCO had convened a Meeting with Railways, SRLDC & SRPC on 28.04.2017.
TANTRANSCO vide letter dated 18.04.2017 had informed that the issue of consideration of
Open Access by Southern Railway as Deemed Licensee is sub-judice. At this stage since the
134th OCC Minutes- 11.08.2017 Page 25
Petition on the above matter is pending with the Hon‟ble APTEL, New Delhi and pending in
principle approval from TANGEDCO, permitting Open Access to Southern Railways as Deemed
Distribution Licensee for availing allocated power from RGPPL is not feasible. APTEL Order
was expected on 18.07.2017.
KSEBL had informed that an issue such as Deemed Licensee status for Railways was still
subjudice. Only balanced three phase supply is possible from STU as per CEA Connectivity
Regulations & there were Metering issues as per IEGC and such restrictions were not there in
Supply Code of Discoms under which Railway was getting its supply presently.
6.17.4 In the meeting SE(O), SRPC informed that LTA could be operational by September/October
2017 and requested all the concerned to take up with Management urgently.
6.18 Scheduling of Simhadri Stage I Station
6.18.1 Simhadri Stage-I scheduling had been started by SRLDC from 01.05.2017 onwards. Main/Check
meters at Simhadri Stage - I end of Inter connector was not yet installed.
6.18.2 SRLDC informed that NTPC was given certain time line and NTPC was yet to be taken action in
this regard..
6.18.3 NTPC informed that the requirements of meters are noted and immediate action would be taken
to see that meters are placed.
6.19 Monitoring of scheme funded from PSDF
6.19.1 In earlier OCC meetings, NPC had furnished the details of the grant sanctioned from PSDF for
the schemes in Southern Region were furnished. It was requested that the status of
implementation of the above schemes physical as well as financial progress may please be
reviewed and the entities were requested to kindly expedite implementation of the schemes. It
was recalled that the entities may furnish the information in the specified format by first week of
every month on regular basis to Member Convener, PSDF Project Monitoring Group (AGM,
NLDC, POSOCO) with a copy to NPC Division.
6.19.2 NPC had informed that next Meeting of NPC may be called shortly. Exact details of percentage
of works completed needed to be filled in the Remark Column of Annexure of NPC Agenda. A
summary on the percentage of works completed may kindly be furnished to NPC.
6.20 Right of Way issue of 400 kV Nelamangala-Hoody Line/ commissioning of 400 kV Yelahanka substation/220 kV evacuation system of KPTCL at Yelahanka substation
6.20.1 SR II Powergrid had informed that the compensation issues were being settled for LILO of
Nelamangala - Hoody at Yelahanka. Regarding Madhugiri – Yelahanka in three districts,
Bengaluru Urban, Bengaluru Rural and Tumkur ROW issues are being faced. The connectivity
at Yelahanka will not be useful until the 220 kV side cables are made through by KPTCL.
6.20.2 KPTCL had informed that cable for Yelahanka connectivity is awarded in December 2016 and
scheduled to be commissioned in December 2017.
134th OCC Minutes- 11.08.2017 Page 26
6.20.3 In the Meeting KPTCL informed that cable received. RoW issues were being resolved. Targeted
for Dec‟ 2107.
6.21 Daily Load Forecasting by SLDCs/RLDCS/NLDC
6.21.1 The mean absolute error (forecast Vs ac tual demand) forth month of July 2017 as furnished by
SRLDC is at Annexure-6O.
SRLDC computed Mean Absolute % Error based on States data
Description AP TS KAR KER TN
Average 6 4 4 5 4
Max 10 9 13 9 8
Min 2 1 0 3 2
6.21.2 In the Meeting, it was noted that the maximum mean absolute % error had crossed 13 % in
Karnataka for two days. SRLDC informed that for all the states they had used the data furnished
by respective states for analysis.
6.21.3 KPTCL informed that there was forced outage of transmission lines between Bijapur and
Bagalkot as wind generation had increased. Along with tripping of lines, generation also lost.
Load shedding also was carried out on the day.
6.21.4 KSEBL informed that many 110 kV lines are being tripped due to various reasons and desired to
know whether it should be taken as load shedding. Also in Kerala a lot of roof top solar has
come up. Around 25-30 MW roof top solar is available at present. CIAL is having an IC of 35 MW
and is considered as a captive plant and consumption of CIAL is not accounted in KSEBL
demand.
6.21.5 MS SRPC expressed that the demand value is considered for planning activities and for many
analysis and should give a realistic picture. All states were requested to come up with
suggestions to capture the actual demand (including that of DGR & Rooftop Solar etc).
6.21.6 SE(O), SRPC informed that „ Nil‟ load shedding was reported by KPTCL and such events should
be reported in demand not met ( as load shedding) due to transmission constraint carried out for
PSP.
6.21.7 DGM, SRLDC stated that an overall improvement was observed in all states but there was
scope for further improvement.
6.21.8 In the 126th OCC Meeting, SRLDC had informed that a Pilot Project for RE forecasting had been
started. Pilot Project for load forecasting was yet to commence. RE Connect has been entrusted
the work.
6.22 Highest Wind Generation in SR
In the Meeting SRLDC informed that on 17.07.2017 SR witnessed highest ever wind injection
(198.87 MU). Tamil Nadu wind generation was around 94.05 MU. It was observed that Andhra
Pradesh met 42 %, Karnataka 27 % and Tamil Nadu 32 % of consumption from Wind
134th OCC Minutes- 11.08.2017 Page 27
Generation. 25 % of consumption (max) was met by Wind Mill. It was noted Installed Capacity of
Wind + Solar has crossed 22 GW with respect to SR. The presentation by SRLDC is at
Annexure-6P.
Generation from wind mills on 17.07.2017
Generation
(MU)
AP
TS
KAR
KER
TN
SR
WIND 57.74 1.48 44.98 0.62 94.05 198.87
6.23 Frequent tripping of Vallur-NCTPS lines 6.23.1 In the Meeting, it was noted that the replacement of insulators were completed in the NCTPS –
Vallur lines and other connected lines.
6.23.2 SRPC had suggested that NTECL & NCTPS may go for RTV coating in their switchyard as had
been done by other entities
6.24 Scheduling of NTPC Ramagundam Solar Power Plant (10 MW)
In earlier Meeting, NTPC had informed that written communication in this regard to MoP would
be shared with SRLDC/SRPC.
6.25 Scheduling of Solar at Kamuthi Solar Park
6.25.1 CEA, Legal Division vide letter dated 30.03.2017 had concluded that as per advice sought by the
SRPC the scheduling of the Solar Power Project can be scheduled under the provisions
of IEGC (Regulation 6.4.2(b) by SRLDC.
6.25.2 SRLDC vide letter dated 10.04.2017 had informed that SRLDC can schedule power from M/s
AGEL and its subsidiaries. However, in order to avoid any difficulties at a later date it was
suggested that M/s AGEL may seek Hon‟ble CERC‟s directions resolving the difficulties
mentioned in SRLDC‟s letter before SRLDC can begin scheduling of the generating station
under IEGC Regulation 6.4.2(b).
6.26 Subsequently a Special Meeting was proposed to be held at SRPC Bangalore on 09.08.2017
which was postponed.
6.27 Upcoming Wind/Solar Projects
6.27.1 In the earlier OCC Meetings SRPC/SRLDC had enquired the States regarding the proposed
addition of Wind/Solar projects in their respective system. The following was noted:
NTPC was requested to come back on status update of NP Kunta Stage II. In Andhra
Pradesh and Karnataka also Wind/Solar parks are expected to be come in near future like
at Ananthapur and Pavagada.
134th OCC Minutes- 11.08.2017 Page 28
It was noted that procedure for RE Frameworks had been notified and is available at NLDC
website. It was requested to all the concerned to take up with generators and information
as mentioned in the Notified Procedure are to be collected/ensured from RE generators.
SRPC had informed that the progress of works of RE Generators and evacuation system
are available in TCC/SRPC Minutes. All the concerned were requested to update the same
and revert back at the earliest incorporating appropriate changes.
It was felt by the forum that a separate RE Meeting may be convened with States and
Major Generators (may be generators with 500 MW and above Installed Capacity)
quarterly to have focused discussion on the progress.
6.27.2 In the Meeting SRLDC informed that TATRANSCO has submitted the details. Karnataka has
furnished information of existing generators and SRLDC requested to furnish the information for
upcoming generators also. AP, TS and KSEBL were requested to furnish the information at the
earliest.
6.28 Power Flow Analysis under high RE scenario
6.28.1 SRLDC vide E-Mail dated 08.06.2017 had informed that a project has been undertaken jointly by
POSOCO, USAID and NREL for power flow analysis under high RE scenario. This study would
look into the reliability and security issues with high RE penetration. As a part of Phase-I of this
work, studies are proposed to be conducted for 2018 grid scenario. For this purpose States were
kindly requested to share the details of existing wind & Solar generator details and Wind and
Solar expected to be commissioned by July 2018 with the details of planned transmission
system. It was also requested to kindly fill in the details sought as per the attached format. The
sample wind station diagram was also attached for reference.
6.28.2 In the Meeting SRLDC stated that the details were required urgently within a week. SRLDC was
requested to send a reminder letter/mail.
6.28.3 In the Meeting the following was noted:
TSTRANSCO, TANTRANSCO and KPTCL had furnished the information.
APTRANSCO informed that stress study had been carried out through a Spanish
Consultant.
SRLDC requested APTRANSCO and KSEBL to furnish the information.
6.29 Status Review of REMC project implementation
6.29.1 In the Meeting SRLDC informed that the proposal has been put up to Empowered Committee.
Approval had been delayed due to administrative issues and approval is expected by this month
end. Execution period is 15 months from approval date. There are four schemes for three states
namely for Andhra Pradesh, Karnataka and Tamil Nadu and one for SRLDC. Separate SCADA
will come for renewables with existing RTUs and communication system.
6.30 Patrolling / Maintenance of critical lines and substations
6.30.1 In last couple of years insulator tracking has been observed in the Transmission lines and
Substations located in the coastal and polluted areas. The format for furnishing the details of
134th OCC Minutes- 11.08.2017 Page 29
schedule / Patrolling and Maintenance carried out of the critical Transmission lines and
Substations had been circulated.
6.30.2 SRPC observed that every month some scheduled activity may be there and it is responsibility of
SLDCs to ensure that it was being carried out. SRPC & SRLDC need to be informed
accordingly.
6.31 PSS Tuning of generators
6.31.1 5th Meeting to review the status of PSS tuning of the generators was convened on 26th July 2017
and minutes of the Meeting are available at SRPC website. All the generators to follow the action
plan finalized in the 5th PSS meeting. PSS study group had analyzed the SRT reports furnished
and recommendations had been finalized. The Step Response Test Reports in the specified
formats to be submitted in soft form to SRLDC ([email protected])/SRPC / CTU
([email protected]) / SRPC (seoprnsrpc- [email protected];
6.31.2 In the Meeting SE(O), SRPC requested all the concerned to take action as per the
recommendations in the Minutes and to follow the action plan finalized in the Meeting.
6.31.3 The following was suggested in the 5th Meeting of PSS:
Generators to furnish required information from the field and the model details to SRLDC.
SRLDC will use this information in simulation and come out with the optimal Gain set
points, which can be used as a reference while carrying out the actual PSS Tuning.
While furnishing the test results, MW scale in graph needed to be taken appropriately
considering the operating range for better comparison and conclusion.
Final adopted settings, damping factor & damping ratio computation also needed to be
submitted.
CTU was requested to collect information from other Regions regarding PSS Tuning,
SRT Tests etc. which may be shared.
Adani PL was requested to share its experience on high frequency sampling DRs.
KPTCL to share the details of recorders in new AVR/PSS at Sharavathi.
NTPC would share the experience of Modeling, Simulation & PSS Tuning for a 500 MW
unit with brushless excitation system and PMU installation at generators.
Generators to inform SRLDC about SRT/PSS Tuning enabling SRLDC to observe nearby
PMUs.
Noise observed in some of the parameters in some of the units is to be referred to OEM.
SRLDC/NLC to study the MVAR interchange for NLC II Stage Units (only Step change of
+/- 1 % was possible due to high MVAR changes.
6.32 Implementation of URTDSM (PMU) project in Southern Region
134th OCC Minutes- 11.08.2017 Page 30
6.32.1 URTDSM - Status update in respect of the Meeting held on 07.02.2017/subsequent OCC Meetings are as below:
Sl No Activity Status/Remarks
1 Status of URTDSM Project (SR Portion)
PMUs to be installed in SR as per URTDSM Project Package–II had further increased from 240 to 270 on account of commissioning of certain new stations and additional feeders. (As per LOA-212)
Status
Total Envisaged
Survey completed
S/S PMU
SS PMU Installed
SR I
128
Pending in Hyderabad, Khammam
and Vemagiri.
20 Supplied: 107 Commissioned:
97 Integrated: 85
SR II
41 142 Completed 39 Supplied: 138 Commissioned:
112 Integrated: 110
Kalamassery integrated. KSEB to extend the bus
voltage. Forum expressed concern that project was getting
delayed and requested PGCIL / GE to share monthly project execution plan up to Sep 2017 and monthly progress ( installation and integration to Control Centre) status by end of every month.
2 Contractual amendment
Final Amendment had been issued on 19.05.2017 and system expected to be commissioned by Sep 2017.
3 Requirement of Auxiliary Power Supply System (APS) as per revised BOQ (excluding input ACDB and one battery bank of the proposed two battery banks).
Survey completed. Space in SRLDC is not sufficient for APS solution under URTDSM project. APS system not supplied due to space constraint in TN & SRLDC.
4 Capacity of Battery & charger
None of the constituents requested 48 V DC power supply source. Hence this point is not applicable now.
5 Responsibilities under
Entities
SR-II confirmed that Dismantling of panels, any civil works etc required to prepare site for installing APS System was not under the scope of the Project and thus was in the scope of respective constituents.
Supply, erection& commissioning of UPS, ACDB Input &Output panels, Battery Bank and associated cabling works for establishing APS system was under the scope of the Project.
Air Conditioning System was required and Constituents were to make necessary arrangements.
134th OCC Minutes- 11.08.2017 Page 31
Kerala yet to provide clear site by removing existing old EMS SCADA system and dismantled materials.
KPTCL has yet to provide Air-conditioning system to match with the commissioning schedule i.e. Sept. 17.
TANTRANSCO yet to provide the earthing connection point for the panels
6 Redundancy for PMUs PGCIL confirmed that all PMUs are provided with redundant communication path and schematic diagram of communication flow had been shared with the constituents.
7 SAT procedure FAT completed for all 4 Nos control centers. Equipment supplied to all 4 Nos control centers and installation under progress at SRLDC , Karnataka SLDC & TN SLDC.
8 SR Region Training Training had been firmed up by M/s GE and one batch training is over.
9 Availability of necessary communication ports for connection of servers under URTDSM
Except TANTRANSCO, all constituents extended the required communication ports at PDS.
10 Training on Application part Application part is in development stage. Would communicate the details in due course.
11 Update the Drawings Constituents‟ requested PGCIL to update the Drawings with changes done in the CT/PT/Status wiring for the PMU system and submit as built drawing.
PGCIL had informed that it will be submitted on closure to commissioning.
12 Completion of the commissioning activity at each site
M/s Alstom and PGCIL representatives were requested by constituents to certify the completion of the commissioning activity at each site.
13 Mandatory spares PGCIL had agreed to furnish the details about the
mandatory spares supplied at each site. Mandatory
spares (servers and switches) supplied at each control
centre where main hardware supplied.
Mandatory spares (servers & switches) supplied at
each control center where main hardware
supplied.
6.33 Video Conferencing facility at SLDCs
AP PUDU
APSLDC informed that they would be taking up themselves and claim from M/s ALSTOM.
Puducherry would take up VC requirement in the next financial year 2017-18.
6.34 Status of important elements
ICT at Madurai
134th OCC Minutes- 11.08.2017 Page 32
It was noted that the provision of one No. of 500 MVA additional ICT at Checkanoorani 400/230 kV S/s in PGCIL end 400 kV side was commissioned on 29.12.2017. LV side 230 kV Bay work is under progress and would be completed on 30.09.2017.
In the Meeting TANTRANSCO informed that tender was opened on 16.05.2017
Status of ICTs at Trichy
The works are completed and commissioned.
Completion of Karaikudi bay – PGCIL and TN SLDC to update
In the Meeting, PGCIL informed that the works will be completed by November 2017. TANTRANSCO expressed concern over commissioning of bays.
6.35 Advance intimation regarding first time synchronization of transmission elements with all
necessary
The approved procedure needs to be followed with due diligence.
6.36 RE Data
The information received from states is at Annexure-6Q.
6.37 Assessment of lift irrigation loads and necessary planning for using as demand response
It had been observed that TS is assessing the lift irrigation loads. It was suggested that other
states could also assess the lift irrigation loads which will help in load management /RE
issues/load change over in a optimal manner.
6.38 Communication requirement for ensuring data /voice to RLDC/ SLDC during Natural Disasters SRPC vide letter dated 10.07.2017 had taken up the issue with CEA on Communication
requirement for ensuring data /voice to RLDC/ SLDC during Natural Disasters. It was requested
to CEA that the way forward to the above issue may kindly be suggested.
6.39 Operating Procedure for SR
SRLDC informed that Operating Procedures for SR for the year 2017-18 had been published
and available at SRLDC website.
6.40 Data for PoC
NLDC had submitted the PoC data for Quarter October –December (Annexure-6R) .All DIC‟s
were requested to submit the comments at the earliest. KSEBL stated that they had furnished the
comments but are not reflecting in the NLDC data.
SRLDC informed that Kerala comments had been received at NLDC. .
6.41 Letter from MNRE
6.41.1 In the meeting SRLDC informed that SRLDC has received a letter from MNRE. The following
was noted.
Ministry of Defense has requested MNRE to formulate a methodology to switch ON or
OFF the wind farms/turbines near to IAF/Railways during war time using centralized
system in order to avoid any interference to IAF operations in the war.
Wind power division of MNRE has come up with the methodology that could be adopted
by the wind turbine operators in foreseen situations.
134th OCC Minutes- 11.08.2017 Page 33
Installed capacity of wind mills and wind farms that are commissioned near the vicinity
of IAF are required to be submitted to MNRE.
Power project developers should establish a centralized monitoring and control system
and such CMCS should be capable of switching all the wind turbines in the respective
wind farms. The communication between CMCS and the individual WTG in the wind
farm should be independent of internet.
In addition to this wind farm developers should have internet based control system,
SCADA which can be put at any of the locations depending on the requirement.
Wind farms should have SCADA and CMCS operational. Each wind generator should
have the provision to switch ON manually also.
Wind developers should demonstrate the operating procedure to nearby Air force
officials once in a year, respective state nodal agency and STU.
Wind developers should assure that all prerequisite approvals including all safety
measures are obtained from respective STU/CTU in order to assure the above
mentioned activities whenever required.
MNRE had requested SRLDC to review the procedure/contents and furnish the
comments/suggestions by taking the views of SLDCs also.
6.41.2 SRLDC informed that SRLDC is writing a letter to all the concerned and States are requested to
furnish the information as sought by MNRE. They would seek clarity on „vicinity‟ from MNRE.
6.42 Precautions to be taken regarding Grid Security in SR
6.42.1 SRLDC vide letter dated 08.08.2017(Annexure-6S) had furnished the precautions to be
taken by SLDCs in the expected low demand during 12th to 15th August 2017.
6.42.2 OCC forum noted the above.
7 GRID FREQUENCY
7.1 High frequency
7.1.1 High Frequency Grid Operation
7.1.1.1 It was noted that the Regional Grid had operated above IEGC range i.e.50.05 Hz for 14.36% of
the time. It was also noted that the frequency on some of the days was higher for considerable
periods as shown below:
Date
Percentage of time of Frequency
50.05 Hz &<50.2 Hz
More than 50.2 Hz
02- July -17 23.19 0.00
06- July -17 23.19 0.07
19- July -17 21.74 0.00
20- July -17 19.65 0.00
23-July -17 26.46 0.00
24 July -17 20.42 0.21
7.1.1.2 SRLDC informed that maximum frequency touched 50.22 Hz on 6th July 2017 at 08:01 hrs. It was
observed that during the instance all the SR States drawal were under limits except Tamil Nadu.
TN under drawal was around 400 MW during the instance. (Graph at Annexure-7A)
134th OCC Minutes- 11.08.2017 Page 34
7.1.1.3 SRLDC presented the underdrawal of states when frequency was above 50.05 Hz. (Annexure-
7B). Out of 24 instances which met the criteria for frequency, sustained under drawals were
observed for Karnataka 1 instance, Telangana 1 instance and for Tamil Nadu in 19 instances.
7.1.1.4 The maximum under drawal touched by States are as follows:
AP : 793 MW for 18 minutes on 30.07.2017
TS : 795 MW for 19 minutes on 20.07.2017
KAR : 789 MW for 25 minutes on 19.07.2017
KER : 529 MW for 2 minutes on 28.07.2017
TN : 796 MW for 9 minutes on 29.07.2017
7.1.1.5 Constituents were advised to kindly avoid uneconomic operation at high frequencies. It was noted
that this affects the power transfer between NEW Grid and SR grid to a great extent.MS, SRPC
requested all the constituents that action needs be taken to stick to the schedule since it had
commercial/operational impacts even for under drawals.
7.1.2 High frequency excursions w.r.t. 5.2 (j) of IEGC during load change over and remedial
measures to arrest such instances
7.1.2.1 All SLDCs/constituents were again requested to kindly adhere to the Regulations in place or take
up with appropriate forum for any exemption / amendment. Following remedial measures to
arrest high frequency operation in the Grid were noted:-
Implementation of staggered load changeover by the constituents/DISCOMs
Moderating own generation
Restricted Governor Mode of Operation of all eligible machines to be in place
Proper load management to prevent the sharp rise in frequency
ADMS healthiness
Exploring the possibility of running in pump mode the Kadamparai and Srisailam units
Planned and advance intimation for surrender of ISGS
Reduction in purchases/MTOA/STOA transactions
7.1.3 Operation of Nagarjunasagar / Srisailam / Kadamparai units in pump mode
7.1.3.1 It was noted that there was no pump mode operation at Kadamparai & Srisailam LB units
during the month of July 2017.
7.1.3.2 It was noted that a Special Meeting had been convened at SLDC, TSTRANSCO in which the
recommendations were finalised w.r.t Nagarjunasagar & Srisailam pump mode operation
7.1.3.3 It was noted that with higher ingress of renewable energy, the matter regarding utilization of
existing Pump Storage hydro schemes has been highlighted in most of the RE integration
forums. Pursuant to deliberations held in MoP, a Technical Committee had been constituted
in CEA under Chairmanship of Member(Planning) for study of optimal location of various
types of balancing energy sources/energy storage devises to facilitate grid integration of RE
and associated distribution. This issue has also been part of deliberations of the Committee
Meetings. A meeting regarding operationalization of existing pump storage plants (PSPs) and
134th OCC Minutes- 11.08.2017 Page 35
related issues was held in New Delhi (at NRPC) on 28.06.2017 wherein it was suggested to
take up these issues with CEA. (Minutes of the Meeting is at Annexure-7C).
7.1.3.4 Accordingly, SRPC vide letter dated 06.07.2017 had taken up the issue with Member (Hydro),
CEA and requested that CEA may kindly bestow its attention on these issues.
7.2 Low Frequency
7.2.1 It was noted that the frequency of grid operation was at times in the lower range of IEGC. The
grid had operated below IEGC range i.e. 49.90 Hz for 8.27 % of time. It was also noted that the
frequency on some of the days was less than 49.90 Hz for significant duration as shown below:
7.2.2 SRLDC informed that minimum frequency touched was 49.69 Hz at 21:16 hours on 8th July 2017.
It was observed that Southern Regional states drawals were within limit except AP which was
over drawing around 400 MW during the incidence. (Graph at Annexure-7D) .
7.2.3 Overdrawal by SR constituents at frequency less than 49.90 Hz (Annexure-7E) was presented
by SRLDC. SRLDC stated that proper demand side management measures needed to be
implemented by the constituents to curtail low frequency operation. The maximum over-drawals
touched by States during July 2017 are as follows:
AP : 728 MW for 128 minutes on 08.07.2017
TS : 617 MW for 39 minutes on 25.07.2017
KAR: 710 MW for 44 minutes on 27.07.2017
KER: 314 MW for 5 minutes on 30.07.2017
TN : 780 MW for 64 minutes on 11.07.2017
7.2.4 SRPC & SRLDC felt that automatic control was required in such situations. SRLDC suggested
that ADMS settings may be changed to 49.90 Hz. and contingency plan w.r.t Tamil Nadu needs
Date Percentage of time of frequency
<49.2 Hz
49.2 Hz & < 49.5 Hz
49.5 Hz & < 49.7 Hz
49.7 Hz &< 49.8 Hz
49.8 Hz & < 49.9 Hz
02-July-17 0.00 0.00 0.00 0.21 5.21
03-July-17 0.00 0.00 0.00 0.83 15.49
04-July-17 0.00 0.00 0.00 0.35 8.89
07-July-17 0.00 0.00 0.00 0.35 11.53
08-July-17 0.00 0.00 0.21 2.85 15.63
09-July-17 0.00 0.00 0.00 0.14 2.99
12-July-17 0.00 0.00 0.00 0.07 7.50
16-July-17 0.00 0.00 0.00 0.21 4.58
18-July-17 0.00 0.00 0.00 0.28 9.72
19-July-17 0.00 0.00 0.00 2.29 7.50
21-July-17 0.00 0.00 0.00 0.07 6.18
25-July-17 0.00 0.00 0.00 0.07 6.94
26-July-17 0.00 0.00 0.00 0.97 9.17
27-July-17 0.00 0.00 0.00 2.85 23.54
29-July-17 0.00 0.00 0.00 1.46 17.85
30-July-17 0.00 0.00 0.00 1.39 7.99
31-July-17 0.00 0.00 0.00 0.21 4.58
134th OCC Minutes- 11.08.2017 Page 36
to be reviewed considering generation loss at pooling station level. TANTRANSCO had been
suggested to revert back.
7.2.5 The following was informed by constituent states for month of July 2017 :
State/UT Load shedding in MU
Max load shedding in MW
Bilateral Purchases import (+)/export (-) in MU
Comments
AP 0 0 616/227
TS 0 0 1914/45 Agricultural supply of 9 hours was being ensured from April 2016. Agricultural supply is extended to 24 hours in 3 districts.
KAR 0 0 490/32
KER 4.53 350 568/10
TN 0 0 1518/25
PED 0.33 20
7.3 Messages for violation of Deviation Limits(Annexure-7F)
7.3.1 SE(O), SRPC stated there were many instances of sustained under drawls and over drawals and
corresponding emergency/noncompliance messages were to be suitably issued.
7.3.2 From the analysis it is evident that continuous overdrawal/underdrawal are observed in AP, TS
and TN. SE(O), SRPC requested the states to take steps to ensure that these type large quantum
and sustained underdrwal/overdrawal are curtailed and exchange of power may be explored.
7.3.3 SRLDC informed that 422 (real time-emergency/alert) messages had been issued to SR
constituents during July 2017. AP (142), TS(55), KAR(47), KER(14), TN(162),and Pudu(2).
(Annexure-7G) Beyond the real time messages issued, they are in touch with states over phone
to get the situation improved.
8 VOLTAGE PROFILE
8.1 Low voltage
8.1.1 It was noted that the following nodes experienced low voltage in July 2017. :
Station Minimum
Voltage in kV
Average duration in
minutes per day when V
< 380kV
Bengaluru 372 26
Trichur 377 53
134th OCC Minutes- 11.08.2017 Page 37
8.1.2 In the earlier OCC Meeting States had been suggested to take measures like capacitor
installation/UVR/tap optimization in downstream of these areas.
8.1.3 SRPC & SRLDC stated that concerted efforts was needed to be taken to improve the voltage profile
at 400 kV and 220 kV Sub Stations in SR grid for safe and secure grid operation. The action plan
for mitigating the low voltage scenario in the long term also was required to be firmed up and to be
shared in OCC.
8.2 UV Relay
8.2.1 The following was noted in the 131st OCC Meeting:
State Location identified for implementation
Status of implementation /Remarks
KPTCL Somanahalli
Nelamangala
Hoody
For Second Stage a letter had been communicated to BESCOM to identify the new set of feeders as the existing list of feeders configured will not suffice the required relief.
8.2.2 KPTCL had informed about the mail received from BESCOM and they had sought some more time
for identification and finalization of feeders for Phase-II of UVAR.
8.2.3 In the Meeting, it was suggested that in case of BESCOM was not able to identify the feeders,
feeders at higher voltage level may be identified to trip through SCADA.
8.3 Installation of Shunt Capacitors (Status as on 1st August 2017 at Appendix)
8.3.1 The information regarding installation/healthy capacitors in the required format needed to be
regularly furnished every month. SRLDC requested that installation & ensuring healthiness of
capacitor banks at distribution level should be ensured by all the constituents.
8.3.2 PSS/E Base Case model has been received from the states of SR for low voltage scenario.
Complete converged network of SR had also been modeled by SRLDC/SRPC and submitted to
CPRI on 23rd March 2017 for capacitor requirement assessment. SRPC vide letter dated
27.03.2017 had again requested constituents to make necessary arrangements to contribute
towards Consultant Fee charges for assessment study to CPRI.
Pallakad 377 1
Udumalpet 377 39
Cochin 379 7
Trivandrum 379 5
Nelamangala 376 34
Bidadi 375 39
Hosur 373 24
134th OCC Minutes- 11.08.2017 Page 38
8.3.3 SRPC vide letter dated 03.05.2017 had placed a work order on CPRI for carrying out the
assessment studies for Southern region (except Karnataka). The total cost would be Rs.17.35
lakhs, excluding taxes, for the Regional level study of Capacitor requirement for SRPC excluding
Karnataka from the scope of study. 4 states will be there as part of study namely Andhra Pradesh,
Kerala and Tamil Nadu and Telangana.
8.3.4 In the Meeting, it was noted that CPRI may be submitting the study report within few days.
8.4 High Voltage
8.4.1 SRLDC highlighted the severity of high voltage problem at the following nodes as given in table:
8.4.2 Condenser mode of operation of NagarjunaSagar and Srisalam LB
8.4.2.1 In the Meeting SRLDC presented condenser mode operation of Srisailam and Nagarjunasagar
Units (Annexure-8A). It was observed that even though high voltage was persisting on all days
the condenser mode operation was not consistent.
8.4.2.2 The following issues had been deliberated in the Special Meeting held on 28.04.2017 at
Hyderabad and the following was noted:
STATION
MAX VOLTAGE IN KV
AVERAGE DURATION IN MINUTES PER DAY WHEN V > 420 KV/ V > 780KV
Vijayawada 430 795
N‟ Sagar 429 232
Hyderabad 430 335
Gooty 434 642
Kurnool 430 489
Khammam 430 421
Vemagiri 426 248
Srisailam 441 1140
Hiriyur 432 264
Guttur 425 60
Raichur 428 319
Kaiga 429 91
Narendra 434 229
Chennai 423 124
Pugalur 425 170
Malkaram 436 801
Sattenapally 429 618
Almatty 435 779
Mysore 434 217
Hassan 431 129
Mehaboobnagar 440 1070
Raichur TPS 810 73
Kurnool 765 812 88
Nellore 765 807 60
Tiruvalam 765 817 569
134th OCC Minutes- 11.08.2017 Page 39
TSGENCO had informed that issues with Nagarjunasagar units would be rectified
during next overhaul planned during this year.
TSGENCO informed that Srisailam units were having this technical difficulty. It could
take around 3-4 hours to put all machines in condenser mode of operation. TSSLDC
confirmed that units are being put in condenser mode as per grid requirement.
8.4.2.3 In the Meeting, SRLDC informed that Srisailam 400 kV side voltage is touching 440 kV nearly
every day. In this scenario synchronous condenser mode of operation of Srasailam Units are
very much essential to control the voltage. TSTRANSCO had informed that that synchronous
condenser mode of operation was not possible due to lack of sufficient cooling water pressure. It
was also noted that temperature rise also is observed in this mode of operation. SRLDC had
requested TSTRANSCO to explore an alternate method of cooling as high voltages pose threat
to Grid security. Even total black out of station also may occur. Forced cooling method by
pumping water was suggested.
8.4.2.4 TSTRANSCO was requested to furnish the problems action taken/planned to rectify the issues
at the earliest.
8.4.3 Status review of GT Tap positions
8.4.3.1 GT tap Positions - GT taps yet to change as per recommendation:
Station
Unit Present Tap And Corresponding Voltage(In kV)
Recommended Tap And Corresponding Voltage(In kV)
Remarks
ISTS connected Generators:
Kaiga I 1 & 2 6 & 229.125 7 & 223.25 MVAR interchange as per Special Meeting to be ensured. Kaiga II 3 & 4 3 & 409.5 4 & 399
APGENCO/APSLDC
IPPs of AP It is recommended that all IPPS under APSLDC could be advised to change their Tap position corresponding to voltage level of 400 kV / 220 kV.
KPCL/KAR SLDC
Sharavathi 9 & 10 2 & 231 4 & 220 KPCL informed that at Sharavathi new GTs (Thoshiba Make) were procured for Units 9 & 10 which were expected within one years. Tap change would be carried out after receiving the ICTs.
UPCL 1 & 2 4 & 409.5 5 & 400 Observed rotor teeth temperature issues. 2 x 125 MVAR reactors agreed in 39th SCPSPSR. It was suggested that their MVAR absorption should be
134th OCC Minutes- 11.08.2017 Page 40
around 50-60 MVAR in case they are not able to change Tap.
TANGEDCO/TN SLDC
Tuticorin TPS 1,2,3,4 5
8 & 243 230 All the GTs in TTPS are kept in Tap No. 10.
MTPS St.III 1 6 & 409.5 7 & 399 Provision of Bus Reactor is being carried out by GCC/TANTRANSCO, Salem. After the provision of Bus Reactor the GT Tap will be increased to 7(399 kV) from Tap-6. Reactor bay works were completed at present and allotment of reactor is awaited.
8.4.3.2 GT taps of all new units getting synchronized to grid should be kept at nominal grid voltage level of
400 kV or 220/230 kV. SRLDC would ensure the requirement for ISTS connected generators while
SLDCs need to ensure it for their embedded generators.
8.4.3.3 A Special Meeting had been convened on 04.04.2017 to discuss on the MVAR
absorption/injection. The minutes of the Meeting are available at SRPC Website. Summary /
Recommendations of the Special Meeting are given below:
For some generators, it was noted that there was injection / absorption at the same voltage
levels though tap position and Vref were reportedly unchanged. All the generators were
requested to kindly analyse the response and take steps to improve the performance.
It was noted that there were still some margins available as per Capability Curve and
generators could consider improving the MVAR interchange.
It was noted that few units were not keeping the Vref at nominal and were changing it
manually to control / restrict the MVAR interchange. This was to be discontinued
immediately.
SLDCs would discuss MVAR issues for embedded generators along with RGMO/FGMO
issues.
SRLDC would take up the status point availability to SRLDC of the GT taps for ISG stations
wherever not extended.
MVAR testing would be taken up for a few stations shortly and schedule would be
communicated by SRLDC.
8.4.3.4 SRLDC informed that next set of MVAR testing schedule is tentatively scheduled and is as
follows:
State Station Date
Karnataka BTPS KPCL would confirm the date
TN NTPL 18.08.17
134th OCC Minutes- 11.08.2017 Page 41
AP TPCIL & SGPL 15.09.17
8.5 MVAR Interchange/MVAR capability testing
Nodal Officers may kindly ensure that the data reaches SRLDC/SRPC in time (by fourth of
every month) so that SRLDC can correlate it with SCADA data and analysis could be done
facilitating actions for further improvement.
Recommendations finalized in the Special Meetings/Capability Testing Reports were
required to be implemented.
All the SLDCs to kindly monitor VAR absorption/injection of generating units in their
respective control areas in real-time.
Order of Hon‟ble CERC dated 23.12.2009 merited attention in this regard. It had been stated
in the Order that all agencies needed to provide required reactive compensation thus
avoiding the need for exchange of reactive power to/from ISTS and maintain ISTS voltage
within specific range.
8.5.1 Regional entities to implement the steps to contain the rise in the voltages in their
respective control area stations as given below:
Ensure Bus reactors and Line reactors are switched in.
Capacitor banks especially at high voltage areas are switched off.
Optimizing the GT and ICT tap positions as per the advice of SRLDC/SRPC.
Tap optimization at lower voltage levels to be carried out by STU/SLDC in coordination
with DISCOMs.
All the generating units on bar to absorb reactive power as per their capability limits.
Operate generating units on synchronous condenser mode for VAR absorption,
whenever feasible.
Release loads in high voltage areas keeping in view the drawl of the control area.
Maintain drawl from grid close to schedule.
Operate available hydro units on pump mode in high voltage nodes keeping in view
the drawl of the control area.
Load re- arrangement, wherever feasible, may be taken up to optimize loading on
trunk lines.
Line opening would be the last resort by SRLDC after receipt of message from the
constituents.
Concerted action/follow up by SLDC.
8.6 Status review of Bus/Line Reactors, Line Reactors and STATCOM
8.6.1 Status of implementation of Bus / Line Reactors approved in the Standing Committee / SRPC
pending for commissioning by the SR constituents is furnished below:
Entity Bus Name Status REMARKS
KPTCL
Hoody Reactor erected on platform.
October 2017
Nelamangala Reactor erected on platform
December 2017
Entity Bus Name Capacity in MVAR
Approved in
Type
Remarks
PGCIL Yelahanka 2x63 Bus Deferred as per 40th SCPSSR. When
134th OCC Minutes- 11.08.2017 Page 42
Madhugiri line will come it will be expedited.
Cuddapah 50 to 125 39th SC Yet to be awarded
APTRANSCO
Vemagiri 125 36th SC
Bus Kalpakka, Vemagiri and Kurnool is expected by October 2017. LoA issued on 18.06.2017. Engineering and foundation works are under progress. Awaiting for APERC approval for Chitttoor Reactor. Commissioning by March 2018.
Kurnool 125 Bus
Kalpakka 125 Bus
Chittoor 125 39th SC
Vijayawada 125 39th SC
It was noted that a separate reactor at Vijayawada in scope of AP had been identified. The exact location could be firmed up by APTRANSCO.
APTRANSCO/ APGENCO
VTPS Stage IV
125 39th SC
APGENCO informed that reactor enquiry was being taken up. It was noted that this reactor was different from the APTRANSCO reactor.
KPTCL
Davangere 125 39th SC KPTCL informed that they had taken up with CEA for reviewing. During studies no reactors had been considered at that area and arrived at 125 MVAR requirement. Now two reactors had come at Guttur and Talaguppa.
Talguppa 125 39th SC
TANTRANSCO
Almathy 125 39th SC Tender under progress
Kayathar 125 39th SC Tender under progress
TANTRANSCO/ TANGEDCO
Mettur 125 39th SC Diverted from Palavadi. Structural works are over
TSTRANSCO
Mamidipalli 125
36th SC
Bus Gazwel: Commissioned on 31.03.2017 Expected to be commissioned in September 2017. Malkaram commissioned
Gajwel 125 Bus
Sankarapalli 125 Bus
Mehboob Nagar
125 Bus
Malkaram 125 Bus
TSTRANSCO: Sanction of funding from PSDF is received for 5 Nos of 125 MVAR reactors from MoP on 05.09.2016. Works for all five reactors awarded in September 2016 and works are in progress.
TSTRANSCO/ TSGENCO
Srisailam LB 125
39th SC
Erection of GIS Bus reactor is not suggestible due to financial implications and space
134th OCC Minutes- 11.08.2017 Page 43
constraint in 400 kV GIS of SLBHES. Hence, the erection of Bus reactors will be examined at other end. TSGENCO was requested to take up the issue with Standing Committee.
NPCIL Kaiga 2 x 125
Bus
KGS informed that both the reactors are expected to be commissioned by December 2019. Financial approval had been received. They were in the process of floating the tender.
UPCL Udupi 2 x 125
39th SC
KPTCL had informed that the line is planned to be LILOed at Drinking water substation between UPCL and Hassan. Subsequently the studies would be put up to Standing Committee. UPCL will submit the issues to KPTCL and KPTCL will discuss with PCKL to sort out issues. UPCL had submitted all the information as required.
8.6.2 APTRANSCO had informed that first 125 MVAR reactor at Ghani had been commissioned on
24.04.2017. Additional 125 MVAR bus reactor works are under progress. 80 MVAR reactor at
Jammalamagudu and Uravakkonda would be commissioned in December 2017.
8.6.3 In view of very high voltage at some nodes, it was emphasized that urgent action needs to be
taken to commission reactors as committed. All the constituents were requested to update the
status of implementation of reactors on a monthly basis in the OCC Template (State wise/
location wise / status of implementation like tender called, PO placed etc) .
8.6.4 In the Meeting SR I informed that commissioning of NGR bypass breaker/isolator for all reactors
in SRTS I had been completed except the following
400 kV Nellore-Thiruvalam line I & II ,Thiruvalam-Kurnool I & II, Kozhikode-Mysore I & II
line reactors : November 2017
8.7 Reactive Power Planning
8.7.1 Status update on capacitor installation is given below:
134th OCC Minutes- 11.08.2017 Page 44
Utility Reactive Power Planning Voltage level
Remarks
APTRANSCO
Kadapa: 273.6MVAR
Vijayawada: 136.8 MVAR
Visakhapatanam:151.2 MVAR
On 33 kV side
14.4 MVAR commissioned
0 MVAR commissioned
7.2 MVAR commissioned
APSPDCL 802 MVAR
70 MVAR commissioned
APEPDCL 276 MVAR
0 MVAR commissioned.
KPTCL Bengaluru Tr. Zone:708.8 MVAR
12.1 kV LOA issued.
Bagalkot Tr. Zone :258.1 MVAR
12.1 kV Material supplied. Erection completed/under progress.
Hassan Tr. Zone 150.8 MVAR
Material supplied. Erection completed/under progress.
Mysore Tr. Zone :60.9 MVAR
3x2.9 MVAR commissioned
Gulbarga Tr. Zone :98.60 MVAR
No update
Tumkur Tr. Zone :281.3 MVAR
12.1 kV 40.6 MVAR commissioned. 34.8 MVAR EI approval awaited.
KSEBL
360 MVAR
66 kV Works will be taken up after approval.
11kV
TANGEDCO
34 x 2.4 MVAR 11 kV
16 x 2.4 MVAR 22 kV 14 x 2.4 commissioned
35 x 2.4 MVAR 11 kV Tender to be floated.
51 x 2.4 MVAR 22 kV Tender to be floated
13 x 24 MAVR 110 kV Tender under negotiation.
82 sets of 11 kV, 2.4 MVAR Capacitor Banks in Coimbatore Region
11 kV Tender to be floated.
822 MVAR capacitors at Distribution level had been commissioned out of 931 MVAR capacitors planned.
Balance 109 MVAR to be commissioned. However, for further enhancement of Reactive Power, Capacitor bank provisions have to be arranged by Planning/Transmission wings.
8.7.2 SRPC & SRLDC requested all the states to come up with the updated information like till date
commissioned, plan for new commissioning, quantum in working condition, action taken to
rectify/replace faulty capacitors, etc.
9 Network Protection/Security issues
9.1 U/F & df/dt Relays Schemes
134th OCC Minutes- 11.08.2017 Page 45
9.1.1.1 Implementation of SRPC recommended quantum
It was noted that all the States had implemented AUFR and df/dt schemes fully. All the
Constituents were requested to furnish the details of the feeders implemented in AUFR & df/dt
schemes along with the status of SCADA mapping as per the specified Formats.
In accordance with clause 9 (2) of CEA (Grid Standards) Regulations, 2010, all constituents shall
submit a detailed report of operation of AUFR at different frequencies to SRLDC and SRPC on
daily basis. It was noted that only KSEBL and PED were submitting the daily report regarding
operation of relays.
9.1.1.2 SRLDC presented the load relief realized as a percentage of AUFR quantum declared in the
identified feeders during the month of July 2017 as follows: (Presentation at Annexure-9A)
AP: 81 %, TS: 49 % KAR: 113 %, KER: 83 %, TN: 57 %, Pudu: 66%. SR: 79 %.
9.1.1.3 SRPC & SRLDC expressed concern that the load relief observed in real time in respect of
Telangana and Tamil Nadu was very less. TSTRANSCO informed that as per them visible relief
was around 57 % whereas as per SRLDC it was only 49 %.
9.1.1.4 MS, SRPC expressed concern that less realization even during Peak Months was threat to
system security. The issue needed to be addressed by TN & TS and was to be reviewed
appropriately. If required, additional feeders may be required to be identified.
9.1.2 SCADA mapping of feeders of AUFR &df/dt schemes
9.1.2.1 As per CERC vide Order dated 27.11.2015 on Petition No. 60/MP/2014, SRPC vide letter dated
29.01.2016 had submitted the status report duly certified by SRLDC and SRPC w.r.t
implementation of SCADA mapping of all the constituents to Hon‟ble CERC. SCADA mapping
confirmation report of KSEBL had also been submitted to Hon‟ble CERC.
The status update is as follows:
State SCADA mapped
%
Status
AP 64 APTRANSCO informed that 20 RTUs had been
commissioned out of 25 and have achieved 64 %.
5 would be commissioned shortly. Balance RTUs
are covered under OPGW scheme approved
through PSDF.
TS 79 TSSLDC informed that 6 RTUs had been provided
for Solar Generators and for 17 RTUs, procurement
was being taken up and it could take 4-5 months.
There were 18 RTUs for Interstate feeders and
some would provide UFR and df/dt relief quantum
also. With this they were likely to achieve 100%
mapping.
134th OCC Minutes- 11.08.2017 Page 46
TN 92 Additional RTUs needed to be procured for 100%
SCADA mapping. 100 % data visibility will be
ensured by June 2017. Transducers to be procured
and expected by June 2017.
SRPC/SRLDC requested that a monthly report on the action taken to reach 100 %
availability may be furnished to SRPC/SRLDC.
9.1.2.2 APTRANSCO and TANTRANSCO were requested to kindly initiate the action to achieve 100 %
SCADA visibility.
9.1.2.3 Joint validation of AUFR and df/dt feeder details of individual States by SRPC and
SRLDC
9.1.2.4 As decided in 132nd OCC meeting, a team was formed with members from SRPC and SRLDC
to validate AUFR & df/dt feeder details viz., radial or grid mode connected load, flow values,
SCADA mapping, table configuration at SLDC SCADA and ICCP transfer etc., by visiting the
concerned SLDCs of the States in SR.
9.1.2.5 As per the schedule joint validation has been done for Telangana on 1st August 2017 ( Report
at Annexure-9B) . Salient points are:
32 feeders / elements data in AUFR and df/dt are not available at TS SLDC. Besides that
all the related data is available at SLDC and SRLDC.
TSLDC informed 132 kV Kamalapur-Manthani feeder is no more radial and they are
planning to relocate as per the feasibility.
TSLDC informed that Sircilla substation was upgraded to 220 kV, so they are planning to
change 220kV Durshed to 132kV Sircilla feeder to 220/132kV or 132/32kV Sircilla PTRs as
per feasibility.
6 feeders which are in df/dt stage 2 are repeated in AUFR stage-2.
1 feeder in AUFR stg-1 is repeated in AUFR stg-4. TSLDC informed that they will continue
the above feeder in stage-4 only.
9.1.2.6 As per the schedule joint validation has been done for AP on 02nd August 2017(Report at
Annexure-9C). Salient points are:
47 feeders / elements data in AUFR and df/dt are not available at AP SLDC. For those
feeders for which APSLDC was having data and SRLDC was not getting data, those data
has to be extended from APSLDC to SRLDC and will be done during next ICCP onlining at
SRLDC.
Three feeders / Elements data are coming negative. The same are due to generation
pockets (wind or solar) that have come up as per APTRANSCO.
As informed by APTRANSCO, all the feeders are radial feeders only, However as data is
not available, APTRANSCO may review the same.
9.1.2.7 The presentation by SRLDC is at Annexure-9D
9.1.2.8 SE(O), SRPC informed that some discrepancies are observed in the type of feeders/PTRs
between the APTRANSCO report and Joint Validation report by SRLDC/SRPC for AUFR and
df/dt. He requested AP to kindly analyse the same and clarify the reasons for discrepancies.
134th OCC Minutes- 11.08.2017 Page 47
Subsequently SRPC vide letter dated 18.08.2017(Annexure-9E) had taken up the issue with
APTRANSCO.
9.1.2.9 KSEBL informed that the realisation percentage showed is not matching with their analysis and
desired to know the feeders which SRLDC was considering.
9.1.3 SPS operation of Talcher-Kolar on 23.07.2017
9.1.3.1 HVDC Talcher - Kolar Pole 1 & 2 tripped on 23rd July 2017 at 17:07 Hrs. SPS trip signal 1 and
2 operated and load shedding details had been furnished by respective states. It is seen that
there was no load relief in Andhra Pradesh and Kerala upon operation of SPS trip signal 1 & 2.
Also in case of Karnataka and Tamil Nadu the actual load relief was not as per the desired
values. It was requested that the reason for the above may be furnished to SRPC/SRLDC by
the respective states.(E-Mail dated 25.07.2017 at Annexure-9F)
9.1.3.2 KSEBL reply in this regard at Annexure-9G
9.1.3.3 In the Meeting SRLDC informed that the antecedent flow on HVDC Pole I & II was 1,800 MW.
Upon tripping SPS trip signal I & II got triggered resulting in tripping of loads. The load relief
details were furnished by respective states.
Andhrapradesh: 0 MW against designed 470 MW
Karnataka: 300 against designed 450 MW
Tamil Nadu:264 against designed 565 MW
Keral: 0 against designed 170 MW
It was noted that a total expected relief of 1,655 MW the realised relief was only 564 MW
which is quite alarming.
9.1.3.4 The following was informed by the states:
AP informed non receipt of SPS from Kolar end at 220 kV Chinakkapilly for trip signal I
and Gooty, Anathpur, somayajapally, Narnoor for trip signal II.
KSEBL had informed that no trip signal was received at DTPC installed at
Madakkathara and Kanhirode stations. Also a major alarm was persisting at kanhirode
DTPC.
TN informed that trip signal 1 was not extended to KR Thoppur station of
TANTRANSCO from the DTPC installed at KR Thoppur station of PGCIL. Hence the trip
pulse could not be extended to loads at Unjani, Pudansandhai and Deviakurchi being
fed from KR Thoppur TANTRANSCO.
9.1.3.5 SE(O), SRPC suggested that once again mock exercise may be carried out and identify the
problems. This issue would be put up in the next communication/SCADA meeting. He
emphasised the importance of healthiness of the channels in view that Regulation on
Communication is also in place.
134th OCC Minutes- 11.08.2017 Page 48
9.1.3.6 Subsequently SRLDC vide letter dated 18.08.2017(Annexure-9H) had requested SRTS II,
Powergrid to kindly examine the healthiness of communication link from Kolar to respective
states locations and healthiness of DTPCs so as to ensure that the desired load relief is
obtained.
9.1.4 System Protection using Optimization Technique (SPOT)- SRLDC proposal
9.1.4.1 System Protection using Optimization Technique (SPOT) Engine was discussed in earlier OCC
Meetings.
9.1.4.2 SRLDC had informed that they are following up the issue with M/s ABB. They would revert back
with some concrete proposal.
9.1.5 Automatic Demand Side Management Scheme (Petition No. 250/MP/2012) & GSES (Petition No. 265/MP/2012)
9.1.5.1 It was noted that the issue of changing the frequency setting to 49.9 Hz was discussed in the
30th TCC/31st SRPC Meetings held on 24th /25th February 2017 and it was agreed to retain the
settings at 49.8 Hz till the next TCC/SRPC meetings.
9.1.5.2 In the Meeting SRLDC pointed out the following:
ADMS(Proposed) Operation with 49.9 Hz, 15 Min, OD 250MW
47 Instances met the requirement for frequency.
7 instance for AP
2 instance for TS
5 instances for Tamil Nadu
9.1.5.3 After deliberations, OCC forum stated that revision could be discussed further in the TCC/SRPC
Meeting. SRLDC opined that it is the apt time to migrate to new setting.
9.1.5.4 SRLDC had pointed out that similar to existing ADMS logic (O/D), backing down of generation
during the sustained U/Ds during high grid frequency may be required.
9.1.6 It was observed that KSEBL and KPTCL were having provisions of tripping the
generators/backing down in case of U/Ds during high frequency. States were requested to
examine the technical feasibility/provision for backing down of generators and revert back
9.1.7 Grouping of loads (IEGC clause 5.4.2 (e))
9.1.7.1 As per IEGC, to maintain the frequency within stipulated band and also to ensure network
security, the interruptible loads were to be arranged in four groups of loads, This was for the
purpose of scheduled power cuts/load shedding, loads for unscheduled load shedding, loads to
be shed through UF relays, df/dt relays and loads to be shed under any SPS scheme. These
loads are to be grouped in such a manner that there is no overlapping between different groups
of loads.
134th OCC Minutes- 11.08.2017 Page 49
9.1.7.2 The issue was noted for compliance by the concerned utilities. SRLDC requested all the states
to kindly furnish the updated details in this regard.
9.1.8 Tripping Details/Reports
In various forums SRLDC had raised concern that it was not getting tripping information/data
within 24 hrs as per IEGC/CEA regulations and sometimes the information from both the ends
was not being received. Also at times, tripping details only were being received without DR& EL
details. SRLDC was unable to analyse events on account of non-receipt of details of tripping in a
timely manner. SRLDC had stated that all tripping details should be uploaded on the SRLDC
web portal. Para 29 of Hon‟ble CERC Order dated 20.02.2014 in respect of Petition
No.146/MP/2013 was brought to attention of the OCC. Non-furnishing of timely tripping details
would be treated as non-compliance. Procedure for timely furnishing information was needed to
be streamlined by the utilities. It was noted that tripping information details were to be uploaded
within the stipulated time frames.
9.1.9 Declaration of availability and healthiness of various protection / defense mechanism
9.1.9.1 SRLDC stated that the healthiness certification was not being received in timely manner from all
the constituents.
9.1.9.2 Healthiness certificates and other reports were being sought as per directives of higher bodies.
Validated certificates needed to be communicated in a timely manner.
9.2 LVRT Implementation
9.2.1 Hon‟ble CERC has passed Order in respect of Petition No. 420/MP/2014 on 05.01.2016. The
Order directs a number of actionable points by various utilities for compliance of LVRT, CEA &
CERC Regulations etc. Three Special Meeting were conducted at SRPC Bangalore on
05.02.2016, 18.04.2016 & 05.07.2016 (Meeting minutes are available at SRPC website). This
issue was further discussed in the Special TCC Meeting held on 02.08.2016.
9.2.2 The following had been noted in the earlier OCC Meetings: SRLDC had pointed out that PMU at Pooling station was required to assess LVRT
performance.
TANTRANSCO had informed that P&C SCADA scheme was under progress.
TANGEDCO scheme at WTG level was also under progress.
SRLDC had stated that the basic information which they have sought from new generators
had not received from any of the generator. SRLDC vide letter dated 20.01.2017 had
requested all SLDCs to furnish the company wise installed capacity and LVRT/HVRT
characteristic at Renewable energy pooling stations.
SRLDC had requested that SLDCs may kindly prepare a geographic picture of the
Wind/Solar generators and extend it to SRLDC through ICCP. Later it can be integrated to
Regional Picture. In the REMC project extension of data was to be carried out by states and
action now would make it easier subsequently.
134th OCC Minutes- 11.08.2017 Page 50
9.2.3 All the constituents were requested to ensure provision and enabling of LVRT feature in all the
upcoming wind/solar generators before declaring COD. SLDCs were requested to approve
connectivity to new generators only on confirmation of availability of LVRT feature and other
CEA/CERC requirements. Monthly report of compliance needs to be furnished for new wind/solar
generators added to the grid.
9.2.4 It is noted that all the states had been submitted the details for the period from April to June 2017.
The consolidated Report jointly validated by SRPC/SRLDC had been forwarded to CERC vide
letter dated 30.08.2017.(Annexure-9I).
10 Formulation of plan for procurement and Placement of Emergency Restoration System (ERS) in the country
10.1 As per ERS requirement outlined in MoP letter dated 05.12.2014, status update on ERS is given
below:
Transmission Utility
Requirement as per MoP
Existing Status/Remarks
APTRANSCO 3 2 ERS III-submitted for approval of PSDF funding.
TSTRANSCO 1 TSTRANSCO had informed that earlier tender had been cancelled and it was being retendered. Subsequently, it would be taken up for PSDF funding.
KPTCL 2 2
KSEBL 1 Tenders to be floated. Being followed up.
TANTRANSCO 2 Retendering.
PED NIL NIL
PGCIL 4 (2 Nos. Additional)
4 (SR I & SR II is having 2 no. Each)
765 KV ERS (one each for SR-I and SR-II) tendering under progress.
APTRANSCO vide letter dated 06.07.2017 had informed procurement of 3rd ERS
(Emergency Restoration system) was envisaged as per the Instructions of CEA in the last
TCC/SRPC meeting on 9th Jan 2017. In reply to the above, PSDF-NLDC have updated the
status of schemes submitted by the entities for funding from PSDF in which they have
informed that the above proposal is not covered under the criteria given in t he category of
projects eligible for funding as per the clause no.5 of the guide lines”.
Further SRPC vide letter dated 18.07.2017 (Annexure-10A) had taken up with NLDC and
requested that this scheme could be considered under 5.1(e) or under 5.1(a) of MoP letter
dated 05.12.2014, since ERS relives transmission congestion/constraints in real time during
natural disasters when transmission availability is of utmost important and suggested that the
134th OCC Minutes- 11.08.2017 Page 51
above proposal of APTRANSCO for the procurement of ERS may kindly be reconsidered for
PSDF funding.
10.2 CEA vide letter dated 21.07.2017(Annexure-10B) had informed that a Meeting was held in the
Cabinet secretariat under the Chairmanship of Secretary (Security) on 28th June 2017 to discuss
the action taken report on the decisions taken at the early meeting on 9.03.2016 on the Crisis
Management Plan in respect of MoP. It was noted that ERS were in procurement stage in most of
the states and the response from the states was not very encouraging. Secretary (Security) has
sought a note from CEA in the matter so that he may take up the matter with the concerned
States at the highest level. CEA requested that state wise requirement and current availability of
ERS and the action taken on/status of procurement of ERS may please be sent to GM Division for
onward transmission to Cabinet Secretariat.
10.3 Subsequently SRPC vide letter dated 01.08.2017(Annexure-10C) had submitted the required
information to GM Division, CEA.
11 SCADA AND COMMUNICATION
11.1 A Special Meeting was held on 07.02.2017 to deliberate on pending SCADA/Communication issues.
Minutes of the Meeting is uploaded on SRPC website. The status of pending Items as deliberated
in the Special Meeting/Subsequent OCC meetings as updated is as follows:
S.No Issue Action Plan
1 Meeting with M/s ALSTOM
regarding AMC issues,
punch points
8.5 Alstom completed the pending works except some of the on-site training modules, for which schedule was given Alstom to complete by September 2017.
8.6 PGCIL informed that deduction amount had been communicated.
8.7 KSEBL requested for detailed breakup of the payments. 8.8 SR I informed that they had requested AP & TS for the
deductions on account of delay. 8.9 TSTRANSCO informed that they had requested for
modification in EMS package which they would be taking up as a separate order with M/s ALSTOM for around 77 Lacks.
8.10 TSTRANSCO had requested estimate for back up SLDC. PGCIL informed that the request had been communicated to Head Quarters.
2 ICCP link between RTAMC and SRLDC
Link is established and database tables have been exchanged. ICCP association is in progress by SRLDC and NTAMC/Manesar. SR II RTAMC provided the data & SRLDC to further carry out the job.
3 Data discrepancies in ISGS/IPP/PGCIL/STUs
Fresh list of points received from SRLDC on 05.07.2017 and same shall be attended by July end.
4 Providing additional RTU at NTPC Talcher
RTU procurement is under progress.
5 Protection coupler replacement for Kayamkulam Transmission system
Letter from KSEBL received on 23.05.2017. Actual expenditure of Protection Couplers towards PGCIL assets shall be borne by PGCIL at the rates of LOA to be placed by M/s KSEBL. KSEBL to examine the option of
134th OCC Minutes- 11.08.2017 Page 52
buyback of the old panels to be looked into or handover the panels to PGCIL. .
6 OPGW stringing on balance portion of KPTCL lines
Except Hassan-Santhigrama(7.4 kM) OPGW stringing is completed on all the lines of KPTCL. Because of non-readiness of direct line, KPTCL recommended to execute the connectivity through 3 different lines of 35 km and the same may not be possible in the on-going project as the supplies are completed.
7 Migration of SCADA periphery in line with SEM
Both AP & TS: Migrated to SEM based philosophy from 11:00 hours of 09.05.2017. TN migrated on 08.06.2017. KPTCL migrated from 04.07.2017.
8 SCADA Data failure Protocol
RTU not reporting/data failure would be communicated to the concerned entity/user with a copy to PGCIL. User would take lead role in getting the issue resolved. User/SRLDC would ensure necessary verification at their ends as explained in the training. Parallely, PGCIL would look into communication issues. User/SRLDC would appraise PGCIL about the verification at their end for PGCIL to sort out the communication issues.
Official email ID for SCADA issues to be created for each entity/User involved for easier communication and proper delivery of information. All correspondences regarding any SCADA issue to be made through this mail ID only. Details to be communicated to SRLDC/SRPC within a weeks‟ time.
SR II informed that the procedure is being followed
9 Integration of new elements in SRLDC/SLDC SCADA
SR I /SRII noted and shall be complied.
10 Issues with Orange Exchange
It was noted in the Meeting that a Meeting was held on 16.03.2017 at SR II Bangalore and the issues are being addressed. Except Remote sub-scriber units with PLCC links, all issues have been addressed.
11.2 Vide E-mail dated 16.06.2017 PGCIL SR II had informed that award is placed on M/s Vallant
Communications Ltd., for supply & installation of DTPC (60 no.) as approved by SRPC. The issue
was being reviewed in PCSC meeting.
11.3 Voice communication issues: (Annexure-11A)
11.3.1 The following issues were raised by SRLDC in the Meeting:
Many of voice links - NTPC Ramagundam, NTPL, Vallur, NLC TS II, NLC TS II Expansion,
LANCO Stage II, IL & FS were observed during the month of July 2017.
Main reason found for one way speech/disconnections due to bill not paid.
All constituents are required to follow up with their services providers to make reliable speech
communication.
11.3.2 DGM, SRLDC informed that it is the responsibility of generators to ensure that proper
communication is in place as it was required for coordinated grid operation.
134th OCC Minutes- 11.08.2017 Page 53
11.4 SRLDC had invited attention of the forum that CERC had brought out Order on Suo moto Petition
007/SM/2014 dated 29.01.2016 regarding SCADA. It was directed by Hon‟ble CERC that NLDC
and respective RLDC are directed to update the status of telemetry every month at their website
and persistent non-availability of data from the generating stations/substations be taken up in
RPC meeting for appropriate direction and action. Also, NLDC had been directed to submit user
wise latest telemetry by 31.08.2016. SRLDC informed that they had started posting this
information from February 2016 on their website.
11.5 Compiled Telemetry status – Utility wise- as directed by Hon’ble Commission
Hon‟ble Commission vide order dated 19.12.2013 on Suo-moto petition No. 56/SM/2013 had
directed all the utilities to provide the required telemetry within six months of this order.
It was requested that MAPS, KGS & KKNPP may please furnish the compliance status of
pending SCADA inputs the earliest. Details in this regard were available on SRLDC web site.
For KKNPP only 2 points are pending w.r.t GT tap position. Re -tendering was going on and
it will take 5 more months to complete the works.
11.6 PHYSICAL AND CYBER SECURITY/CRISIS MANAGEMENT PLAN/BLACK START
PROCEDURE
11.6.1 Physical and Cyber Security
Status update on Crisis Management Plan(C&DMP) of Power Sector is to be furnished every
quarter. Information regarding Cyber Security was to be furnished to Chief Engineer, DPD, CEA,
Sewa Bhavan, New Delhi-110066. Report on Physical Security, other Mock Drills for CMP, Mock
Drill for Black Start Restoration was to be furnished Chief Engineer, DMLF, CEA, Sewa Bhavan,
New Delhi-110066. A copy of the reports was to be sent to SRPC Secretariat ([email protected]
and [email protected]). Information required by CEA (vide letter dated 26.11.2013)
regarding Security of power installations was to be furnished to CEA.
11.7 Black Start Procedure
11.7.1 In earlier OCC Meetings, SRPC/SRLDC had expressed concern that black start mock test
procedure is not being followed properly, mock exercise by point to point method is not carried
out by all and schedules are also not being furnished. All the concerned entities were
requested to furnish the details of BSRP Mock test completed during 1st half i.e Jan 2017 to
June 2017 and schedule for second half ie July 2017 to Dec 2017 to be submitted at the
earliest.
11.7.2 In case of postponement or non-conducting of mock drill exercise then it must be intimated to
SRLDC along with the reason.
11.7.3 Status needs to be furnished in the following format :
134th OCC Minutes- 11.08.2017 Page 54
State BSRP reports for Jan 2017 to June 2017
BSRP schedule for July 2017 – Dec 2017
Point to point mock exercise report being furnished
Updated list of Nodal Officer
Workshop Schedule
11.8 Conducting mock exercise from RTPS to Jurala, Nagheri to BTPS
SRLDC appraised the forum of the proposed Black Start from Nagjheri to BTPS. KPTCL was
requested to revert back with the details. It was agreed that Black Start from Jurala to RTPS
would also be carried out subject to the generation at Jurala.
In the Meeting it was agreed that SRLDC would furnish a draft procedure and coordinate
for the final date.
11.8.1 In the Meeting, SRLDC expressed concern that most of the SR constituents have slipped from
the mock drill exercise schedules submitted by them and requested all constituents to furnish
the status update and reasons for slippage. Constituents were requested to conduct the point to
point mock drill. The format attached with the letter needed to be filled by the respective states
and sent to SRLDC within 10 days. It was also requested to submit the reports of mock exercise
carried out within 7 days.
11.8.2 In the Meeting it was agreed that mock exercise at KKNPP may be carried out in October 2017
and by that time the technical feasibility of doing the tests while units are in operation also may
be explored.
11.8.3 KGS and MAPS are requested to furnish the details regarding House Load Operation and
regarding restoration from complete black out of the Unis.
11.9 Priority for Railways/Metros in the matter of Restoration of Supply
11.9.1 The following had been noted in earlier Meetings:
KPTCL: to expedite on the actionable points of KPTCL/BMRCL which were finalized in the
Special Meeting.
KSEBL: Vide letter dated 06.06.2016 had furnished the Operating Procedure for extending
supply of power to Kochi Metro.
TANTRANSCO/Southern Railway: The follow up of actionable points finalized in the
special meeting in respect of Chennai Metro may be expedited
TSTRANSCO: was requested to take proactive action in respect of Hyderabad Metro.
11.9.2 In the Meeting, TSTRANSCO was requested to take up the issues with Hyderabad Metro and if
needed Meeting also may be convened.
134th OCC Minutes- 11.08.2017 Page 55
12 RGMO/FGMO
12.1 RGMO response had been deliberated in various Special/OCC/TCC/SRPC meetings.
Inadequate response was an area of serious concern and there was no noticeable
improvement. MS, SRPC had stated that the recommendations finalized in the special
RGMO/MVAR interchange meeting should be complied by all the utilities.
12.2 In earlier OCC Meetings, the following had been noted:
SLDCs were requested to analyze the RGMO instances posted by SRLDC for the
generators in their control area and take up action as per 84/MP/2015. Inadequate
Response to be taken up with SERC (Petition No.302/MP/2013). Action on
recommendations finalized in the Special Meetings needed to be taken by
generators/states. All generators were kindly requested to take all steps to ensure
intended RGMO/FGMO response.
As per the order in RGMO Petition No. 302/MP/2013, the units (including state
embedded) shall not be scheduled beyond their ex-bus generation corresponding to
100% of their installed capacity.
12.3 A Special Meeting had been convened on 04.04.2017 to discuss on RGMO/FGMO issues. A
sub group meeting to have a better understanding of different logics was held on 12.04.2017.
SRPC vide letter dated 15.06.2017 enclosing SRLDCs letter had communicated to all
concerned in this regard.
12.4 Chief (Engg), CERC vide letter dated 05.06.2017 had taken up some issues in this regard.
Status Report on Availability of RGMO/FGMO Response w.r.t SR jointly verified by
SRPC/SRLDC with reference to CERC letter dated 05.06.2017 had been forwarded to CERC
vide SRPC letter dated 24.07.2017 (Annexure-12A) . Subsequently, the list of units with
inadequate performance was also furnished vide letter dated 28.07.2017 (Annexure-12B).
12.5 RGMO implementation/ Extension of RGMO status point to SLDC
State/Entity RGMO Status extension to
SLDC/SRLDC
Comment
TS Thermal updated. Hydro
Manually updated at the
TSSLDC
TSTRANSCO is requested to take up the
issue with GENCO and solve the issue
KAR RTPS-4, Supa and LDPH RTPS Unit IV: will be made available
during R & M works. LDPH: Carried out
the works. Complete wiring is over.
Extended upto SLDC. Supa: yet to be
carried out.
KER Sholayar Sholayar: one unit extended. Rest will be
134th OCC Minutes- 11.08.2017 Page 56
extended during R & M.
All SLDCs were suggested to ensure various provisions of IEGC/CERC/CEA regulations including RGMO before confirming COD for the embedded generators.
To maintain the continuity of the issues, it was agreed that Nodal Officer should invariably attend the meetings.
The list of Nodal Officers was updated in the Meeting.
12.6 In the Meeting SRLDC presented the RGMO response for the incidence on 21st July 2017
The following was the realisation for Units of capacity 200 MW -500 MW
FIRST MINUTE
Thermal
% I/C No Of Units No of R Possible Actual %
AP 1890 9 5 75.02 35.73 47.63
TG 250 1 1 9.81 8.06 82.16
KAR 1570 6 1 48.25 15.9 32.95
KER 0 0 0 0 0
TN 2100 10 0 90.42 24.59 27.2
ISGS 1720 8 0 63.28 12.62 19.94
SR 7530 34 7 286.78 96.9 33.79
SECOND MINUTE
% I/C No Of Units No of R Possible Actual %
AP 1890 9 5 75.02 24.38 32.5
TG 250 1 0 9.81 7.33 74.72
KAR 1570 6 0 48.25 23.08 47.83
KER 0 0 0 0 0
TN 2100 10 0 90.42 9.54 10.55
ISGS 1720 8 0 63.28 13.18 20.83
SR 7530 34 5 286.78 77.51 27.03
The following was the realisation for Units 500 MW and above
FIRST MINUTE
Thermal
I/C No Of Units No of R Possible Actual %
AP 0 0 0 0 0
TG 1100 2 0 43.45 10 23.01
KAR 600 1 0 29.88 0.29 0.97
KER 0 0 0 0 0
TN 1200 2 0 56.63 3.8 6.71
ISGS 8160 16 0 353.73 16.26 4.6
134th OCC Minutes- 11.08.2017 Page 57
SR 11060 21 0 483.69 30.35 6.27
SECOND MINUTE
Thermal
I/C No Of Units No of R Possible Actual %
AP 0 0 0 0 0
TG 1100 2 1 43.45 15 34.52
KAR 600 1 0 29.88 -2.64 -8.84
KER 0 0 0 0 0
TN 1200 2 0 56.63 15.15 26.75
ISGS 8160 16 0 353.73 16.87 4.77
SR 11060 21 1 483.69 44.38 9.18
The following was noted:
JSWEL no response: KAR SLDC was requested to take up with JSWEL. It was informed by
KPTCL that in the meeting conducted for FGMO JSWELrepresentation was not there.
Ramagundam: NTPC informed that Unit I & VI had turbine valve problem. Rectified on 3rd
August 2017. Unit IV settings will be fine-tuned during AOH.
Simhadri: No response: NTPC informed that now units are responding for frequency change
of 0.1 Hz. and above. NTPC is requested to analyse the logic.
NTECL: Unit I (13 MW) less response. Unit II : No response. NTECL informed that schedule
was coming down from 914 MW to 864 MW. The response was balanced out.
Kakatiya Unit I: No response: Poor quality of coal.
UPCL: Modified the logic: But not responded. To examine and revert back.
CEPL/TPCIL: No response To examine and revert back
Singaneri: No response: TS to take up with Singareni
12.7 SE(O), SRPC informed that Report of units giving less response has been submitted to CERC
jointly vetted by SRLDC and SRPC incorporating comments from Generators. He requested all
the generators to take immediate action to assure the adequate response.
12.8 It was noted that as per 5th Amendment to IEGC gas stations above 50 MW Installed Capacity
also should come under RGMO/FGMO Operation from 1st October 2017. SLDCs are requested
to take action to comply the Amendment. AP, Tn and NTPC (Kayamkulam ) were requested to
take up the issue seriously with respective generators.
12.9 It was noted in the Meeting that all the states had conducted Meetings to discuss regarding
implementation of 5th Amendment of IEGC wrt FGMO/RGMO. TANTRANSCO had informed
that they are discussing this issue in their monthly OCC. Minutes of the Meeting held by AP and
KPTCL are at Annexure-12C.
13 TRANSMISSION NETWORK ISSUES AND SYSTEM OPERATION ISSUES
134th OCC Minutes- 11.08.2017 Page 58
13.1 Loadability of ICTs and revisit of the associated protection settings to prevent cascade tripping
of ICTs/high loading of transmission lines. Insufficient action in controlling the loading of ICTs
leads to N-1 criteria violation in compliance of Regulation 3.1 f(8) of CEA(Grid Standards)
Regulations 2010 and Regulation 3.5 a(i) of CERC Indian Electricity Grid Code Regulations
2010.
13.2 High loading on 400 kV Vemagiri PG- Vijayawada & Vemagiri PG-Gazuwaka lines was
observed and status of system strengthening beyond Vemagiri PG Station was to be expedited.
13.3 SRLDC requested all the constituents that whenever real time messages were issued to control
over ICT loadings, constituents should be committed to take necessary steps/load shedding to
curtail the overloading. SRLDC requested for urgent action to alleviate the loading of 400/220 kV
ICTs. A long term solution of augmentation/load reconfiguration needed to be considered /
implemented in view of grid security. Action Plan of constituents to restrict the loading to
permissible limit may kindly be furnished to SRLDC and immediate action needs to be initiated.
14 Prolonged Outages
14.1 Status review of prolonged outage of grid elements in SR & realistic action plan for revival of the
prolonged outage was awaited from some of the constituents. Monthly reports are required to
be submitted to CERC.
14.2 The following was noted in the Meeting:
KKNPP informed that the contract awarding was delayed due to GST issues and would be awarded soon.
14.3 All constituents were requested to convey the schedule of revival for the elements under
prolonged outage to SRPC, which was to be reported to Hon‟ble CERC on monthly basis.
(CERC Order on petition no 146/MP/2013).
15 Closing of 220 kV Upper Sileru- Balimela line
Upper Sileru - Balimela line had been idle charged from 8th January 2015 from Upper Sileru end.
16 Upcoming Generating Stations
16.1 Central Sector
Station Unit Installed Capacity
MW
Scheduled date of synchronizing / commissioning
Remarks
NTPC
Kudgi TPS Stage-I
I,II, III
3 x 800= 2400
Unit-I
CoD from
31.07.2017
Unit-II.
CoD by Sep 17
NTPC had confirmed that
full DC would be ensured
from April 2018.
134th OCC Minutes- 11.08.2017 Page 59
Unit–III
CoD by Dec 17
Telangana STPP Phase I
2 x 800 U-I CoD Jan 2020 U-2 CoD June 2020
Pudimadaka AP 4 x 1000 52 Months from Zero Date
85% share to AP. Zero date yet to be finalized. AP requested NTPC to firm up the zero date at the earliest. AP informed evacuation system would be developed by PGCIL
30th TCC: NTPC informed that the domestic coal was yet to be tied up. APTRANSCO informed that they would apply for LTA with CTU after the coal linkage is firmed up.
NLC
New Thermal Power Project
I 500 April 2018 CTU had informed that for evacuation LILO of Neyveli - Puducherry and 400 kV D/C to Araliyur lines are planned. NLC had applied for LTA of 340 MW which could be managed with the LILO of Neyveli – Puducherry. Balance 600 MW would be catered by 230 kV system of TANTRANSCO. Araliyur S/S was being developed by TANTRASCO and was expected by June 2018
II 500 April 2018
NPCIL
BHAVINI
Kalpakkam (PFBR)
I 500 Synchronization by
2017-18
COD by 2017-18
Synchronization by March 2017 COD by Sep 2017
UMPP
Krishnapatnam 3960 (6 x 660)
APEPDCL and PCKL had taken steps with their legal counsel to expedite the hearing before Honorable High Court of Delhi
Cheyyur 4000 New bids would be called
NEW PROJECTS OF STATE SECTOR & IPP
Updated status of new projects of State sector is furnished below:
Sl No
Name of project Located in
Capacity in MW
Commissioning Schedule /Remarks
1 Rayalaseema TPS ST-IV
AP 1 x 600 Synchronization by June 2017 COD by Dec 2017
2 Dr. NTTPS, Vijayawada
AP 1 x 800 2017-18
3 Krishnapatnam Stage II (U3)
AP 1 x 800
4 Polaki AP 4000 (5 x
134th OCC Minutes- 11.08.2017 Page 60
800 MW)
5 Edlapur KAR 1 x 800
6 North Chennai Stage III TN 1 x 800 2019-20
7 North Chennai Stage IV
TN 2 x 800 Beyond 2019-20
8 Ennore TPS Exp TN 1 x 660 2018
9 Ennore replacement TN 1 x 660 2018
10 Udangudi Stage I TN 2 x 660 2019-20
11 Uppur TPP (TBCB) TN 2 x 800 2019-20
12 Manuguru PPP Telangana 4 x 270 U1 : 20.03.2017 U2: 20.05.2017 U3: 20.09.2017 U4:20.09.2017
13 Kakatiya TPP Stage III Telangana 1 x 800 2017-18
14 Kothagudem TPS Phase VII
Telangana 1 x 800
15 Damaracherla (Yadadri)
Telangana 5 x 800 2018-19
Updated status of new projects of IPPs is furnished below:
Sl No.
Name of project Located in
Capacity in MW
Commissioning Schedule /Remarks
1 Meenakshi PH-II AP 2 x 350 2017-18 Untied: 640 MW
2 East Coast Energy Thermal
AP 2 x 660
2017-18 AP : 300 MW
3 Thermal Powertech (TPCIL) Unit-III
AP 1 x 660
2017-18
5 Godhna TPP, Janjir – Champa Dist, Chhattisgarh
For KAR 2 x 800 2017-18
16.2 SRPC stated that declaration of COD letter from SLDC was required to be submitted to CEA,
Fuel Management Division for purpose of coal linkages etc.
16.3 SRLDC pointed out those new ISTS connected units should come out with detailed metering
scheme for various units commissioning schedule at least one year prior to synchronization.
The scheme needed to be discussed and finalized in the Meeting of Commercial Sub
Committee.
17 LGBR & OUTAGE PLANNING
17.1 Status Review on development of load forecasting tools by SLDCs as per IEGC Clause
5.4.2
17.2 The issue was noted for compliance by the states/SLDCs.
134th OCC Minutes- 11.08.2017 Page 61
17.3 The following was noted from the Order dated 19.12.2013 on Petition No.
249/250/251/MP/2012
“We direct all STUs/SLDCs of the Northern Region, Southern Region and Eastern Region to
forecast their demand and make adequate arrangements to avoid dependence on Unscheduled
Interchange for meeting their demand or for injecting short term surplus power, irrespective of
the frequency”
17.4 There was need for further involvement of DISCOMs for their 96 block load forecast and by
state generators of their 96 block generation forecast. SLDCs needed to play more proactive role
in this regard.
17.5 Outage deviation report for the period April 2017 –June 2017 in respect of Generating
Units/Transmission Elements of Southern Region need to be submitted by all the constituents
which is to be communicated to Hon‟ble CERC.
18 OTHER ISSUES
18.1 Collection of data regarding Power Supply to Rural Areas
18.1.1 In the Meeting held at MoP on 09.04.2014 it had been decided to collect the data invariably
from DISCOMs. It is requested that the data in this regard in the required format may please be
arranged to be communicated to SRPC Secretariat at the following E-mail addresses: msssrpc-
[email protected]/[email protected]
18.1.2 Data to be communicated by first week of the month for previous month.
18.2 Reporting the Status of implementation of the recommendations of the Enquiry Committee
18.3 All RPCs had been requested to update and forward the status of implementation of recommendations of the Enquiry Committee on Grid Disturbances on 30th and 31st July 2012 to CEA in the prescribed format on fortnightly basis regularly i.e. the status as on last day of the month to be forwarded by the 3rd day of the following month, and that as on 15th of the month to be forwarded by 17th of the month. All the constituents were requested to furnish timely status updates.
18.4 Energy Generation data Management from Renewable Energy Sources Monthly generation data in respect of Renewable Energy Sources was to be submitted to CEA
with a copy to SRPC.
18.5 Power supply hours in various States/UTs (Rural and Urban areas) for Replying to Parliament Questions: CEA Requirement Power supply hours to Rural and Urban areas of states/UTs (Rural and Urban category wise is
to be furnished SRPC Secretariat.
18.6 Wind Generation
SRLDC presented the day-wise Wind Generation pattern in Karnataka & Tamil Nadu during the period 1st July 2017 to 31st July 2017. Wind generation in Karnataka had varied between 48.695 MU (20.07.2017) to 22.484 MU (09.07.2017). Wind generation in Tamil Nadu had varied between 96.163 MU (27.07.2017) to 36.433 MU (31.07.2017) (Annexure-18A).
134th OCC Minutes- 11.08.2017 Page 62
18.7 Coal Stock Position
As per CEA norms, coal stock position is termed as critical (< 7 days) or super critical (< 4 days)
of coal stock. Except the following thermal stations in Southern Region all other stations have
more than 7 days stock as on 10.08.2017 (Annexure-18B) :
Raichur TPS(KPCL): 1day
18.8 Generators were requested to take steps to maintain the coal stock position.
19 Vote of Thanks
MS, SRPC thanked the participants for their active participation in the Meeting. He thanked NLC
for the nice arrangements made for the conduct of the meeting.
CGM (Thermal), thanked the OCC members for giving NLC the opportunity to host the Meeting
20 Date &Venue of the next Meeting
The schedule for the next OCC Meeting is as follows:
Meeting : 135th OCC of SRPC
Date : 12.09.2017
Time : 10:00 Hours
Venue : SRPC, Bangalore
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