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Reactive Power Management - Case study

Reactive Power Management - Case study. -- Nandan Pathak (AE). ICT -2. G-3. G-4. G-5. ICT -1. 160 MW 135 MVAR. 160 MW 140 MVAR. 160 MW 135 MVAR. 200 MW 160 MVAR. 200 MW 160 MVAR. 220 kV Parli Bus. 220 kV Girwali Bus. LOAD. LOAD. Preface. GENERATION. LOAD:. 870 MW

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Reactive Power Management - Case study

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  1. Reactive Power Management - Case study -- Nandan Pathak (AE)

  2. ICT -2 G-3 G-4 G-5 ICT -1 160 MW 135 MVAR 160 MW 140 MVAR 160 MW 135 MVAR 200 MW 160 MVAR 200 MW 160 MVAR 220 kV Parli Bus 220 kV Girwali Bus LOAD LOAD Preface

  3. GENERATION LOAD: 870 MW 730 MVAR ~ Problem A ) GENERATORS: a) High MVAR drawl b) High excitation current B) ICT: a) Overloading due to MVAR b) Low voltage on 220 kV bus ( 200 kV)

  4. Problem C) LOAD: 11 kV side: a) Overload tripping b) Very low voltages c) Conductor snapping d) Local load shedding 440 V side: a) Failure of transformers b) Conductor snapping

  5. Analysis • High seasonal load especially agriculture • during October to March • B) Failure of reactive compensation

  6. Analysis • Identification of areas • a) Beed district • b) Solapur district • c) Nanded district • d) Pabhani district • e) Latur district

  7. ~ ~ 220 kV Girwali Bus 220 kV Parbhani 100 MW 80 MVAR 220 kV Nanded 160 MW 100 MVAR 132 kV Parli Bus 132kV Beed 80 MW 60 MVAR 132 kV Girwali Bus 132 kV Latur -2 60 MW 45 MVAR 132 kV Latur -1 90 MW 75 MVAR Analysis • Identification of radial feeders On similar lines loaded 11 & 33 feeders were identified.

  8. Action I) Reactive power compensation available : i. Substation ----- 164 MVAR ii. Switched capacitors on 11kV – 240 MVAR (0.6 X405) II) Focus Area – 11 kV , 0.6 MVAR capacitors a. Repairs in a central laboratory b. On site replacement, checking, modification, training

  9. Modifications adopted for optimum compensation • 1. Cell rating 0.66 Mvar at 12 kV • 2. De-rating at Low Voltage • 3. Modification • A. Fixed capacitors • B. Addition to basic scheme

  10. Modified 1.2 MVAR version

  11. Modified 1.2 MVAR version

  12. Action • 4. On site demonstrations • 5. Team visit – Nasik , Pune (R ), Kolhapur, Sangli,Parbhani

  13. Observations: • 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 105 Volts to 190 volts • 11kV 7.6 kV to 9.8 kV

  14. Changed System scenario ICT -2 G-3 G-4 G-5 ICT -1 200 MW(160) 60 MVAR(135) 195 MW(150) 80 MVAR(140) 200 MW 60 MVAR 250 MW(200) 100MVAR(160) 250 MW (200) 100 MVAR(160) 220 kV Parli Bus 220 kV Girwali Bus LOAD LOAD

  15. GENERATION LOAD: 1095 MW (870) 400 MVAR (730) ~ Changed System scenario Voltage changes: 220 kV 215 kV (200 kV) 132 kV 125 kV (106 kV) 33 kV 31 kV (27 kV)

  16. ~ ~ 132 kV Parli Bus 132kV Beed 95 MW 30 MVAR (80 MW 60 MVAR) 132 kV Girwali Bus 132 kV Latur –2 70 MW 30 MVAR (60 MW 45 MVAR) 132 kV Latur –1 105 MW 40 MVAR (90 MW 75 MVAR) Changed System scenario Radial load changes

  17. MONTH KWH 1998 KWH 1999 KWH 2000 KWH 2001 January 791500 1101100 1014800 401700 February 545000 938100 699100 239400 March 667900 819800 663300* 262200 April 539400 790900 87400* 183400 May 512000 473200 -* 275400 June 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 KWH recorded on 11kV Matkuli feeder from 132 / 11 kV T/F at 132 kV Ashti substation • ---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

  18. 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  Changed System scenario Energy savings on 11 kV Matkuli feeder

  19. Conclusion 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.

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