Minutes of Special Meeting for Frequency Response

Characteristics of regional entities in Western Region held on

27.11.2015 at WRPC Mumbai

Special meeting for Frequency Response Characteristics of regional entities in

Western Region held on 27.11.2015 at WRPC Mumbai. The meeting was attended

by officers from WRPC, WRLDC, NTPC, Maharashtra SLDC, MP SLDC, Gujarat

SLDC & Regional IPPs.

List of participants is enclosed in Annexure-I

At the outset, Member Secretary WRPC welcomed all the participants and stated

that today's special meeting is called as per the decision taken in 477th OCC

meeting held on 9th October 2015 held at NTPC Sipat. He informed that during the

earth quake on 26th September 2015 in north India there was a load throw of around

1200 MW and frequency rose from 50.02 Hz to 50.29 Hz. Frequency response

of generators in Western Region was found to be unsatisfactory and even negative

response has been observed on some of the units and need investigation.

Representative from WRLDC made a presentation (enclosed at annexure –II).

He informed that as per IEGC 5.2 (f) all thermal generating units of 200 MW and

above and all hydro units of 10 MW and above, which are synchronized with the grid,

irrespective of their ownership, shall have their governors in operation at all times,

and under IEGC 5.2 (f) (iii) all other generating units including the pondage upto 3

hours Gas turbine/Combined Cycle Power Plants, wind and solar generators and

Nuclear Power Stations shall be exempted from Sections 5.2 (f) ,5.2 (g), 5.2 (h) and

5.2(i) till the Commission reviews the situation . He requested WRLDC to make a

presentation on the issue. During the presentation WRLDC informed that the

Frequency Response from Western Regions Utilities during rise in frequency after

the earthquake on 26.10.15 is as given below:

J&K Earthquake and Load Loss of 1200MW at All India. Increase in Frequency from 50.02 to 50.29 Hz (Rise of 0.27 Hz)

Generators Generation Before the

event Generation After the

event Difference

SSP 106.78 102.78 -4

KSTPS 2008.92 2002.98 -5.94

VSTPS 3755.52 3702.58 -52.94

SIPAT 2286.51 2195.96 -90.55

Mouda 430.72 433.27 2.55

CGPL 3009 3009.02 0.02

SASAN 3746.3 3746.3 0

NSPCL 471.96 466.06 -5.9

KSK 1158.57 1155.37 -3.2

DB Power 424.63 424.63 0

JP NIGRIE 889.16 887.23 -1.93

ESSARMAHAN 0 0 0

MB Power 508.37 513.86 5.49

MCPL 160.54 159.66 -0.88

RKM 0 0 0

Dhariwal 0 0 0

GMR Raipur 0 0 0

JPL Tamnar 572.48 578.07 5.59

JPL 725.05 715.32 -9.73

VANDANA 0 0 0

BALCO 0 0 0

LANCO 274.94 274.94 0

EMCO 511.23 509.23 -2

SKS 0 0 0

KWPCL 0 0 0

KAWAS 199.32 171.41 -27.91

GAND-HAR 294.92 289.15 -5.77

RGPPL -24.51 -24.51 0

DGEN 660.63 661.82 1.19

TAPS 1111.47 1115.59 4.12

KAPS 191.27 186.48 -4.79

State Control Area Frequency Response.

J&K Earthquake and Load Loss of 1200MW at All India. Increase in Frequency from 50.02 to 50.29Hz (Rise of 0.27 Hz)

State Drawl Before the Event Drawl After the event Difference

GUJ 2741.03 2902.68 161.65

MAH 6737 6855.27 118.27

MP 4904.74 5002.25 97.51

Chhattisgarh 1157.37 1251.72 94.35

GOA 336.13 339.52 0

DD 286.78 286.19 0

DNH 701.2 704.27 0

WR -6724.01 -6037.25 686.76

He reiterated that all SLDCs to compute FRC in line with the CERC order dated

3.05.13 petition no 47, 48, 49, 50, 51/MP/2012. The CERC approved procedure for

FRC computation is available at URL:

http://www.cercind.gov.in/2013/orders/SO47.pdf.

Member Secretary, WRPC suggested all generating units to examine the Frequency

Response of their Stations during such transients and take measures to ensure

compliance to IEGC 5.2 (f), (g), (h), (i). He suggested that bigger size stations such

as NTPC Vindhyachal, NTPC Sipat, NTPC Korba, CGPL, APL Mundra & JPL

Tamnar to carry out detailed study/analysis and summary of same will be discussed

in ensuing 478th OCC meeting on 15.12.2015. at Tarapur. The formats for furnishing

the data for existing status and settings of RGMO/FGMO is enclosed as annexure-

III. All the generator entities are requested to submit information in the same formats.

Member Secretary, WRPC asked WRLDC whether AGC is in line with the

RGMO/FGMO?

In response to the clarification, AGM, WRLDC representative informed that both

commands ie RGMO/FGMO and AGC are given to same controller which regulates

the generation as pre existing logic and settings and design of the machine. RGMO

and AGC are independent of each other. It is like two sources of parallel control input

working on same end equipment for a desired output.

MS WRPC further stated that in view of large amount of variable RES generator

RGMO and AGC along with spinning reserve and ancillary services are need of the

secured and safe operation of the grid

Meeting ended with vote of thanks.

**************************

RGMO / FGMOand

Frequency Response Characteristics of Western Region

Annexure-II

IEGC 5.2 (f)

• All thermal generating units of 200 MW and above and all hydro units of 10 MW and above, which are synchronized with the grid, irrespective of their ownership, shall have their governors in operation at all times

IEGC 5.2 (f) (iii)----Exempted Stations

• All other generating units including the pondage upto 3 hours Gas turbine/Combined Cycle Power Plants, wind and solar generators and Nuclear Power Stations shall be exempted from Sections 5.2 (f) ,5.2 (g), 5.2 (h) and ,5.2(i) till the Commission reviews the situation

IEGC 5.2 (f) (ii) (c) ---- FGMO/ Manual intervention

• If any of these generating units is required to be operated without its governor in operation as specified above, the RLDC shall be immediately advised about the reason and duration of such operation.

IEGC 5.2 (f) (ii) (b)

• Ripple filter of +/- 0.03 Hz. shall be provided so that small changes in frequency are ignored for load correction, in order to prevent governor hunting

IEGC 5.2 (f) (ii) (c)

• All governors shall have a droop setting of between 3% and 6%

IEGC 5.2 (f) (ii) (a)

• There should not be any reduction in generation in case of improvement in grid frequency below 50.05 Hz (for example, if grid frequency changes from 49.9 to 49.95 Hz, there shall not be any reduction in generation). ---Frequency Rise

• For any fall in grid frequency, generation from the unit should increase by 5% limited to 105 % of the MCR of the unit subject to machine capability ---- Frequency Drop

IEGC 5.2 (f)

• Provided that if a generating unit cannot be operated under restricted governor mode operation, then it shall be operated in free governor mode operation with manual intervention to operate in the manner required under restricted governor mode operation.

Western Region Installed capacity

• Installed Capacity : 101248 MW (as on 31st October 2015)• Coal- Thermal + Hydro = 68139 + 7448 = 75587 MW

• Gas+ Nuclear+ Renewable : 10815+1840+13006 = 25661 MW (exempted)

• Capacity mandated for RGMO/FGMO : 69331 MW

• Thus out of 75587 MW - 92% capacity is mandated

Frequency Response

• Event-1• Load Loss of 1200 MW in NR and Frequency Rise of 0.27 Hz in

All India due to Earthquake on 26-Oct-15

• Event-2• Generation loss of 1120 MW in NR and Frequency drop of 0.17 Hz

in All India Grid due to tripping of 2x600 MW units at Kalisindh on 12-Nov-15

Thank You !

Annexure-III

Event-1Unit-1 Unit-2 Unit-3 Unit-4 ------- -------Yes / No Yes / No Yes / No Yes / No Yes / No Yes / NoYes / No Yes / No Yes / No Yes / No Yes / No Yes / No

------- ------- ------- ------- ------- -------------- ------- ------- ------- ------- -------------- ------- ------- ------- ------- -------------- ------- ------- ------- ------- -------

Time Frequency Unit-1 Unit-2 Unit-2 Unit-4 ------- -------hh:mm:ss Hz MW MW MW MW MW

14:41:0014:41:1014:41:2014:41:3014:41:4014:41:5014:42:0014:42:1014:42:2014:42:3014:42:4014:42:5014:43:0014:43:1014:43:2014:43:3014:43:4014:43:5014:44:0014:44:1014:44:2014:44:3014:44:4014:44:5014:45:0014:45:1014:45:2014:45:3014:45:4014:45:5014:46:00

Event-2Unit-1 Unit-2 Unit-3 Unit-4 ------- -------Yes / No Yes / No Yes / No Yes / No Yes / No Yes / NoYes / No Yes / No Yes / No Yes / No Yes / No Yes / No

------- ------- ------- ------- ------- -------------- ------- ------- ------- ------- -------------- ------- ------- ------- ------- -------------- ------- ------- ------- ------- -------

Time Frequency Unit-1 Unit-2 Unit-2 Unit-4 ------- -------hh:mm:ss Hz MW MW MW MW MW

23:05:00 ------- ------- ------- ------- ------- ------- -------23:05:10 ------- ------- ------- ------- ------- ------- -------23:05:20 ------- ------- ------- ------- ------- ------- -------23:05:30 ------- ------- ------- ------- ------- ------- -------23:05:40 ------- ------- ------- ------- ------- ------- -------23:05:50 ------- ------- ------- ------- ------- ------- -------23:06:00 ------- ------- ------- ------- ------- ------- -------23:06:10 ------- ------- ------- ------- ------- ------- -------23:06:20 ------- ------- ------- ------- ------- ------- -------23:06:30 ------- ------- ------- ------- ------- ------- -------23:06:40 ------- ------- ------- ------- ------- ------- -------23:06:50 ------- ------- ------- ------- ------- ------- -------23:07:00 ------- ------- ------- ------- ------- ------- -------23:07:10 ------- ------- ------- ------- ------- ------- -------23:07:20 ------- ------- ------- ------- ------- ------- -------23:07:30 ------- ------- ------- ------- ------- ------- -------23:07:40 ------- ------- ------- ------- ------- ------- -------23:07:50 ------- ------- ------- ------- ------- ------- -------23:08:00 ------- ------- ------- ------- ------- ------- -------23:08:10 ------- ------- ------- ------- ------- ------- -------23:08:20 ------- ------- ------- ------- ------- ------- -------23:08:30 ------- ------- ------- ------- ------- ------- -------23:08:40 ------- ------- ------- ------- ------- ------- -------23:08:50 ------- ------- ------- ------- ------- ------- -------23:09:00 ------- ------- ------- ------- ------- ------- -------23:09:10 ------- ------- ------- ------- ------- ------- -------23:09:20 ------- ------- ------- ------- ------- ------- -------23:09:30 ------- ------- ------- ------- ------- ------- -------23:09:40 ------- ------- ------- ------- ------- ------- -------23:09:50 ------- ------- ------- ------- ------- ------- -------23:10:00 ------- ------- ------- ------- ------- ------- -------

DesignationEmail idPhone Nos

SignatureName

Phone Nos

Name of the Station:

Whether RGMO is in service

Droop Setting in %Upper Load Limit setting in MWLower Load Limit setting in MWUnit Capacity in MW

Whether RGMO is in service

On 26-Oct-15 due to Earthquake at J&k at 14:41:35 hrs Frequency rise from 50.02 to 50.29 Hz

Unit Nos

On 27-Nov-15 due to Unit Outage at 23:05:35 hrs Frequency drop from 49.94 to 49.77 Hz

Unit Nos

Whether FGMO with manual control is in service

NameDesignationEmail id

Signature

Whether FGMO with manual control is in serviceDroop Setting in %Upper Load Limit setting in MWLower Load Limit setting in MWUnit Capacity in MW