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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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slide1

Reactive Power Management

- Case study

-- Nandan Pathak (AE)

slide2

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

slide3

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)

slide4

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

slide5

Analysis

  • High seasonal load especially agriculture
  • during October to March
  • B) Failure of reactive compensation
slide6

Analysis

  • Identification of areas
    • a) Beed district
    • b) Solapur district
    • c) Nanded district
    • d) Pabhani district
    • e) Latur district
slide7

~

~

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.

slide8

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

slide9

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
slide12

Action

  • 4. On site demonstrations
  • 5. Team visit – Nasik , Pune (R ), Kolhapur, Sangli,Parbhani
slide13

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
slide14

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

slide15

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)

slide16

~

~

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

slide17

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
slide19

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

slide20

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.