reactive power management - case study -- nandan pathak (ae)
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Reactive Power Management
- Case study
-- Nandan Pathak (AE)
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ICT -1 ICT -2
G-3 G-4 G-5
200 MW160 MVAR
160 MW135 MVAR
200 MW
160 MVAR 160 MW135 MVAR
160 MW140 MVAR
LOAD LOAD
220 kV Girwali Bus
220 kV Parli Bus
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~GENERATION
870 MW
730 MVAR
LOAD:
A ) GENERATORS:a) High MVAR drawlb) High excitation current
B) ICT:a) Overloading due to MVARb) Low voltage on 220 kV bus ( 200 kV)
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C) LOAD:11 kV side:
a) Overload trippingb) Very low voltagesc) Conductor snappingd) Local load shedding
440 V side:a) Failure of transformersb) Conductor snapping
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A)High seasonal load especially agriculture during October to March
B) Failure of reactive compensation
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A)Identification of areasa) Beed districtb) Solapur districtc) Nanded districtd) Pabhani districte) Latur district
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A)Identification of radial feeders
220 kV Girwali Bus
220 kV Nanded160 MW 100 MVAR
220 kV Parbhani100 MW 80 MVAR 132 kV
Parli Bus
132kV Beed80 MW 60 MVAR
~ ~
132 kV Latur -190 MW 75 MVAR
132 kV Latur -260 MW 45 MVAR
132 kV Girwali Bus
On similar lines loaded 11 & 33 feeders were identified.
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I) Reactive power compensation available :i. Substation ----- 164 MVARii. Switched capacitors on 11kV – 240 MVAR (0.6 X405)
II) Focus Area – 11 kV , 0.6 MVAR capacitorsa. Repairs in a central laboratoryb. On site replacement, checking, modification, training
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Modifications adopted for optimum compensation
1. Cell rating 0.66 Mvar at 12 kV
2. De-rating at Low Voltage2. De-rating at Low Voltage 3. 3. ModificationModification
A. Fixed capacitorsA. Fixed capacitors B. Addition to basic schemeB. Addition to basic scheme
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4. On site demonstrations 5. Team visit – Nasik , Pune (R
), Kolhapur, Sangli,Parbhani
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1. Reduction in overload tripping of 11 kV & 33 kV feeders.
2. Reduction in blowing of HG fuses at 33/11 kV transformers.
3. Reduction in conductor snapping. 4. Improvement in voltage profiles
LT LT 105 Volts to 190 volts105 Volts to 190 volts 11kV11kV 7.6 kV to 9.8 kV7.6 kV to 9.8 kV
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ICT -1 ICT -2
G-3 G-4 G-5
250 MW (200)100 MVAR(160)
200 MW(160)60 MVAR(135)250
MW(200)100MVAR(160)
200 MW60 MVAR
195 MW(150)80 MVAR(140)
LOAD LOAD
220 kV Girwali Bus
220 kV Parli Bus
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~GENERATION
1095 MW (870)
400 MVAR (730)
LOAD:
Voltage changes: 220 kV 215 kV (200 kV) 132 kV 125 kV (106 kV) 33 kV 31 kV (27 kV)
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Radial load changes
132 kV Parli Bus
132kV Beed95 MW 30 MVAR(80 MW 60 MVAR)
~ ~
132 kV Latur –1105 MW 40 MVAR(90 MW 75 MVAR)
132 kV Latur –270 MW 30 MVAR(60 MW 45 MVAR)
132 kV Girwali Bus
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MONTH KWH 1998 KWH 1999 KWH 2000 KWH 2001January 791500 1101100 1014800 401700
February 545000 938100 699100 239400March 667900 819800 663300* 262200April 539400 790900 87400* 183400May 512000 473200 -* 275400June 164400* 459800 167700* 43800**July 313900 1170300 442100
August 310400 948000 490900 September 330600 630400 342700
October 500300 706100 350100 November 530400 854700 626000 December 307300* 1104100 542000
•---Load shifted to another feeder --- Load of other feeder taken on this feeder
•** --- kWh meter stopped due to leading PF
Note:
0.6 MVAR capacitor bank recommissioned at village Pandharee on Dt.28.11.2000
0.6 MVAR capacitor bank added at same location on Dt.4.12.2000
New 0.6 MVAR capacitor bank commissioned at Pokharni Phata on Dt.8.12.2000
KWH recorded on 11kV Matkuli feeder from 132 / 11 kV T/F at 132 kV Ashti substation
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0
200000
400000
600000
800000
1000000
1200000
1998
1999
2000
2001
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Month Forecasted Energy sent out (kWH)
Actual Energy sent out (kWH)
Savings (kWH)
Remark
Dec 2000 689997 542000 147997 21.45
Jan 2001 624172 401700 222472 35.60
Feb 2001 520905 239400 281505 54.00
Mar 2001 562029 265200 296829 52.00
Apr 2001 511766 183400 328366 64.10
May 2001 451451 275400 176051 39.00
Total 3360320 1907100 1453220 43.24
Energy savings on 11 kV Matkuli feeder
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1.System requires high order reactive compensation.
2.Use of fixed value non switched/seasonal manual switched capacitors is economical.
3. Complementary switching for optimum compensation.
4. Dedicated setup for overall line loss reduction.