1SOUTHERN REGIONAL LOAD DESPATCH CENTRE

POWER GRID CORPORATION OF INDIA LIMITED

PRESENTATION ON

ROLE OF REGULATORS

IN

SELLING EXCESS POWER FROM CPPs

31ST May, 2005

by

V.K AGRAWAL

AGM, SRLDC

2

PRESENTATION OVERVIEW

SR GRID AND IPP’ ROLE - QUICK FACTS

OPEN ACCESS REGULATIONS – RECENT CHANGES

IMPACT OF CHANGES – CASE STUDIES

SHORT TERM OPEN ACCESS – EXPERIENCES

REGULATORS DELIGHT – MORE BUT LESS

STATE SECTOR – CHALLENGES & TASKS AHEAD

3

THANK YOU

4

SOUTHERN REGIONAL GRID

QUICK FACTS

5

SOUTHERN REGION

WESTERNREGION

EASTERN REGION

NORTHERN REGION

NORTH-EASTERN REGION

INSTALLED CAPACITY

NORTHERN :- 31,230 MW

EASTERN :- 17,697 MW

SOUTHERN :- 32,734 MW

WESTERN :- 32,354 MW

NORTH-EASTERN :- 2,357 MW

TOTAL 116,372 MW

REGIONAL GRIDS

6

SOUTHERN REGION – GEOGRAPHY

ANDHRA PRADESH

TAMIL NADU

KARNATAKA

KE

RA

LA

POPULATION :- 22.5 CRORES ( 22% OF INDIA)

AREA :- 651 (‘000 SQ KM)(19% OF INDIA)

INSTALLED CAPACITY:- 32,734 MW(28.1%)

PER CAPITA CONSUM. – 700 unit (A. I. – 567)

WEATHER :- South-west monsoon

North-east monsoon

SEA COAST :- AROUND 4000 KM

7

INSTALLED CAPACITY IN SR

The above capacity does not includes

--- About 1342 MW of Wind Mill Capacity in Tamil Nadu.

--- Micro and Captive plants in different states.

STATES HYDRO THERMAL NUCLEARDIESEL/

GASWIND/

OTHERS TOTAL %

AP 3586 2993 --- 272 2 6853 21%

KAR 3277 1470 --- 128 5 4879 15%

KER 1811 -- --- 235 2 2047 6%

TN 1987 2970 --- 423 19 5400 17%

PONDY --- -- --- 32 --- 32 0.1%

C.S --- 8090 830 360 --- 9280 28%

IPP 278 387 --- 2506 1071 4243 13%

TOTAL 10939 15910 830 3956 1099 32734  

% 33% 49% 3% 12% 3%    

8

SOURCE-WISE INSTALLED CAPACITY OF SR

15910 (49%)

10939 (33%)830 (3%)1099 (3%)

3956 (12%)

HYDRO THERMAL GAS WIND/OTHERS NUCLEAR

IN MW

32,734 MW

HYDRO

THERMAL

WIND/OTHERSNUCLEAR

GAS

GENERATING UNITS IN SOUTHERN REGION

A.PKAR

TNKER

TYPICAL

GENERATOR

SPREAD

IN SR

UNIT CAPACITY AP KAR KER TN CGS TOTAL

THERMAL (500 MW) 2 8 10

THERMAL

(200-250 MW)10 7 13 15 45

GAS/THERMAL

(100-150 MW)9 2 3 9 23

HYDRO

(>50 MW)27 27 16 15 85

TOTAL 48 36 19 37 162

- HYDRO

- THERMAL

- GAS / NAPTHA

- NUCLEAR

GENERATING STATIONS ABOVE 1000 MW

GENERATING STATIONS 500 – 1000 MW

GENERATING STATIONS BELOW 500 MW

KHAMMAM

VIJAYAWADANAGARJUNASAGAR

VISAKHAPATNAM

(POWERGRID)HYDERABAD

RAICHUR

GOOTY

HOODY

SALEM

UDUMALPET

TRICHUR

MADURAI

TRICHY

MADRAS

NEYVELI

CUDDAPAHDAVANAGERE

KAIGA

115

317

RSTPP

BHADRAVATI

130x216

4x2

182

151

181

173

302

308172

277

279

155

178x

2

PONDICHERY

BANGALORE

SIRSI

MUNIRABAD

PP

P

P

P

P

P

P

P

P

P

PP

P

P

N

KOLAR

PALLOM

KAYANKULAMEDAMON

TALCHER

JEYPORE

63

187

2x78

2x221

54

HOSUR

KADRA

KODASAALY

Nagjhari

1

120

60

MAPS

P

SSLMM

MMDP

THIRUVANATHAPURAM

ALMATHI

NELLORE

400 KV LINE PRESENTLY

OPERATED AT 220 KV

NELAMANGALA

KURNOOL

GAZUWAKA(AP)

SIMHADRI NTPC

HIRIYUR

189

195

267x

2

258

242

175

179

127

130x

2

221x2

146x252x2

197x2

301x2

8x4

15x2

300

28

330

ABOUT 12000 CKM 400KV TRANSMISSION

TALGUPPA

GRID MAP

GRID FOCAL POINT SHIFTED TO KOLAR AFTER COMMISSIONING OF HVDC

KOODANKULAM

THIRNELVALI

TYPICAL FLOWS ARE FROM NORTH TO SOUTH

QUANTUM CHANGES IN FLOW PATTERN LIKELY AFTER COMMISSIONING OF KOODANKULAM 2000 MW

11

13000

14000

15000

16000

17000

18000

19000

20000

21000

22000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

TIME IN HRS --->

DE

MA

ND

IN

MW

---

>

MONSOON SUMMER WINTER

TYPICAL LOAD CURVE OF SR

WINTER

MONSOON

SUMMER

EVENING PEAK

WEATHER

RESERVOIR CONSUMPTION

12

DEEP VALLEY

DEEP VALLEY

SHARP

PEAK

13

GRID OPERATION

TYPICAL ISSUES IN THE PAST

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GRID OPERATION – TYPICAL ISSUES IN PAST

• LOW / HIGH FREQUENCY PROBLEMS

– FREQUENCY EXCURSES TO LOW/HIGH VALUES

• LOW / HIGH VOLTAGE OPERATION

– CRITICALLY LOW VOLTAGES AT LOAD CENTRES

– SUBSTANTIALLY HIGH VOLTAGES AT FAR ENDS

• SYSTEM BROWNOUTS / BLACK OUTS

– SEPERATION OF SYSTEMS / LOSS OF LOAD

• ECONOMIC IN-STABILITY / INCREASED ELECTRICAL LOSSES– UNRELIABLE / INEFFICIENT OPERATION OF EQUIPMENT

15

GRID PRESENT STATUS

16

47.00

47.50

48.00

48.50

49.00

49.50

50.00

50.50

51.00

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95

% OF TIME --->

FR

EQ

IN H

Z -

-->

2004-05

2003-04

 

<49.049.0 & <49.5

49.5 & <50.5

50.5 & Above

Max Min Avg FVI

 

2004-05 0.13 8.49 91.21 0.17 50.90 48.62 49.85 0.83

2003-04 2.30 22.03 75.23 0.44 51.17 48.18 49.69 1.95

2002-03 49.48 14.48 34.03 2.01 51.37 47.69 48.95 18.86

2002-03

FREQUENCY DURATION CURVE 2002-03, 2003-04 & 2004-05

17

320

330

340

350

360

370

380

390

400

410

42000

:05

01:0

5

02:0

5

03:0

5

04:0

5

05:0

5

06:0

5

07:0

5

08:0

5

09:0

5

10:0

5

11:0

5

12:0

5

13:0

5

14:0

5

15:0

5

16:0

5

17:0

5

18:0

5

19:0

5

20:0

5

21:0

5

22:0

5

23:0

5

TIME IN HRS --->

VO

LT

AG

E IN

KV

---

>

REALITY BITE:

FARMERS IN KARNATAKA ARE HAPPY WITH FEWER HOURS OF QUALITY POWER!!.

EFFICIENCY OF PUMPS AT TG HALLI WATER WORKS IMPROVED!

COMPARISION OF BANGALORE VOLTAGE-TYPICAL DAY

BETTER VOLTAGE PROFILE MEANS LESS ELECTRICAL LOSSES

Jan 02

Jan 03

18

SOUTHERN REGION LOSS*

 2002 2003 2004** 2005**

 

LOAD (MW)

LOSS (MW)

LOSS %

LOAD (MW)

LOSS (MW)

LOSS %

LOAD (MW)

LOSS (MW)

LOSS %

LOAD (MW)

LOSS (MW)

LOSS %

AP 6510 408 6.27 5983 264 4.41 7234 311 4.30 7557 279 3.69

KARNATAKA 4078 265 6.50 4609 237 5.14 5158 228 4.42 5285 183 3.46

KERALA 1928 82 4.25 2227 101 4.54 2479 86 3.47 2453 66 2.69

TAMILNADU 6135 224 3.65 6888 240 3.48 7421 198 2.67 7522 216 2.87

PONDICHERRY                   215 0 0.00

CENTRAL GENERATING STATION 472 0 0.00 684 0 0.00 538   0.00 121 0 0.00

SOUTHERN REGION 19123 979 5.12 20391 842 4.1 22830 823 3.6 23153 744 3.2

•*Source : Report of System Studies conducted for Accessing Shunt Compensation requirement in Southern Region – March 2004 and March 2005 - SREB ,CEA

•** Projected figures 0.5% REDUCTION MEANS 100 CR ANNUAL SAVINGS0.5% REDUCTION MEANS 100 CR ANNUAL SAVINGS

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GRID PRESENT STATUS

CARDINAL EVENTS

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GRID PRESENT STATUS -- CARDINAL EVENTS

• AVAILABILITY BASED TARIFF

• UNIFIED LOAD DESPATCH SCHEME

• GENERATION ADDITION

• INTERREGIONAL AC / HVDC LINKS

• OPERATIONAL EXCELLANCE

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AP KAR KER TN PONDY

Total UI exported(-) /

Imported(+) in MUs

-4441 4132 1210 1163 -140

Total amount paid in Crores

Rs.-899 768 204 344 28

Average rate of UI in paise/unit 202 186 169 296 203

SUMMARY OF UI – 124 WKS(FROM 01/JAN/03 TO 15/MAY/05)

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UI IN SR (FROM 01/01/03 TO 15/05/05)

• TOTAL UI TURNOVER :- 7792 MU

• TOTAL UI AMOUNT DISBURSED:- 1600 CR

• AVG WEEKLY TRANSACTION:- 63 MU

• AVG WEEKLY UI AMOUNT DISBURSED:- 13 CR

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GRID OPERATION:GRID OPERATION: A TIGHT ROPE WALK A TIGHT ROPE WALK

BLACK-OUTVOLTAGE

COLLAPSE IN-ECONOMIC

OPERATION

INSTABILITYPOWER

SWINGSINCREASED

LOSSES

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UI TRANSACTION ON 31/08/03

HIGHLIGHTS OF UI TRANSACTION ON 31.08.03 (SUNDAY, GANESH CHATURTHI)

• UI imported from ER : 6.07 MU• UI imported from WR : 2.81 MU• Total UI imported from C. Grid by SR : 8.88 MU• Average UI rate of C.Grid : 93 Ps/Unit • Average UI rate in SR for C.Grid : 213 Ps/Unit • Max. Power transfer in UI from ER : 510 MW• Max. Power transfer in UI from WR : 350 MW• Total Max. Power transfer in UI from C.Grid : 860 MW• Amount saved for the SR constituents : 107 Lacs• Total Number of HVDC Operations : 50 no.s