SPEAKER: SHRI S.K. GHOSH,

DY. CE, DSTPS, DVC, ANDAL

SOLAR & WIND CAPACITY (GW)

As on 31ST. August,

2020

Expected in

Year, 2021-22

Solar 36.49 100

Wind 37.70 60

Biomass 9.95 10

Small hydro 4.65 5

Total 88.79 175

INSTALLED CAPACITY

As on 30.08.2020 As on 31.03.2022 As on 31.03.2030

(GW) (%) (GW) (%) (GW) (%)

Thermal (Excluding Gas):

206.46 55.40 217.00 45.30 267.00 32.10

Hydro: 45.69 12.30 51.00 10.65 73.00 8.80

Gas: 24.96 6.70 26.00 5.43 25.00 3.00

Nuclear: 6.78 1.80 10.00 2.09 17.00 2.00

Renewable: 88.79 23.80 175.00 36.53 450.00 54.10

Total: 372.69 100.00 479.00 100.00 832.00 100.00

POWER POSITION IN WORLD

LEVEL

COAL FIRED POWER GENERATION ACCOUNTS FOR ABOUT 40% OF WORLD ELECTRICITY GENERATION The coal fired power generation is widely used in high energy consuming countries such as China, India & the USThe proportion of coal fired power generation is about 34% in Japan

PERCENTAGE OF EACH GENERATION RESOURCE

180

177

174

172

171

172

175

178

179

180

182

181

181

179

178

178

178

175

175

185

190

190 187

186

29 27 25 22

23

23

23

41

59

80

94

102

108.0

82

105

93

81

62

44

33 32 29

29

29

29

111

111

110

111

110

111

112

96

77

58

46 3

9

32.6

65

35

45

57

76

92

102

109

117

117

115

114

0

25

50

75

100

125

150

175

200

1 2 3 4 5 6 7 8 9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

GW

Hours

Total Load (2021-22) RES (S+W) BAU Coal BAU

PROJECTED DEMAND & GENERATION ON THE DAY 27TH JULY,2021

BAU – Business as usual

• Low PLF and flexible operation of thermal power plants

• Balancing capacity and steep ramping requirements

• Shortage of natural gas

• Low VM & High ash content in coal

• Implementation of new environmental norms

• Sustained supply of Coal for daily generation

• Ash disposal

• Pump storage

CHALLENGES – PRESENT AND EMERGING IN INDIAN POWER MARKET

ROAD MAP FOR FLEXIBLE

OPERATION

1. Hydro plants are especially suitable for quick supply of power. Pump storage,

existing and under construction, shall be used exclusively for meeting the

peak load or balancing the system.

2. Gas power plants have better start stop capability and need to contribute to

flexible generation as much as possible.

3. 210 MW & 500 MW units shall be operated at lower MTL than bigger size

units.

4. Among the fleet of (200 MW, 500/600 MW or 660/800 MW) thermal units, which

are efficient and have low ECR, should be given preference over other units in

terms of generation schedule.

ACTION PLAN TO MEETUP CHALLENGES

5. Test run/ study of thermal units for operation at low load shall beconducted as has been done for NTPC plants & presently beingundertaken for DVC, DSTPS & MPL, MAITHON.

6. Capex to be reimbursed on actual basis after examination,Regulatory intervention is required.

7. The skills of plant operators to enhance to meet up present

requirement .

ACTION PLAN TO MEETUP CHALLENGES

Merit economics for supporting flexibility

Scheduling in flexible regime with all India Merit Order Dispatch based on ECR

Categorization of units

SymbolCategor

y

Capacity

RangeCapacity

No. of

units

X Low flexible660 to 800

MW68160 98

Y Flexible490 to 600

MW70770 133

ZVery

Flexible

195 to 360

MW67640 285

TSOTwo shift

operation< 151 MW 10564 110

Total 217134 626

Scheduling Case Study

Factors considered for

selection of a thermal unit:

1. Unit heat rate

2. Load centre unit

3. Pit head unit

4. Old units

5. New units

6. Merit Order/ ECR

7. Super critical/ Sub-critical

8. Size of unit

• Boiler tubes, bends, water walls etc. - life consumption from fatigue, creep-fatigue, corrosion, expansion

• Turbine valves, casings, rotors – life consumption

• Achieving very low firing rates

• Other impacts

– air heater corrosion and leakage

– lower efficiency, incr. cost

– higher emissions

PLANT AREAS TO CONSIDER

Command Area of 24,235 sq. kms

State Districts Covered

West Bengal East & West Bardhaman, Hooghly, Howrah, Purulia & Bankura

Jharkhand Bokaro, Dhanbad, Hazaribagh, Chatra, Latehar, Koderma, Giridih, & Jamtara

DVC’s FUTURE INITIATIVES FOR

THE PUMP STORAGE & RE POWER

DVC INITIATIVES - LUGU PAHAR PUMP STORAGE PROJECT

Pumped Storage project at Lugu Pahar on Bokaro river in Jharkhand with maximum capacity of 1500 MW (6x250 MW)

Project considered by Expert Appraisal Committee (EAC) of MOEF & CC.

LOA for preparation of DPR by consultant is expected by November 2020.

Expected finalization of DPR by May 2022. Project completion by March 2028 (construction time - 60 months).

DVC PUMP STORAGE HYDRO

DVC’S INITIATIVES – RENEWABLE ENERGY

• Floating Solar Plant on reservoirs at Maithon, Panchet, Tilaiya & Konar having a total

capacity of 2000 MW under UMREPP & CPSU Schemes of MNRE, GOI:

JV proposal (between DVC & NTPC) is under process of approval of DVC Board.

Expected completion: Phase wise up to 2024.

Ground Solar plant of 50 MW capacity at DVC Panchet:

Through Developer Mode (DBOT-Design Built Operate Transfer).

Price Bid Opened on 24.09.20 and in process of approval from DVC Board for award.

Completion time : 1 year after signing of PPA.

INITIATIVE OF DVC, DSTPS ON

FLEXIBLE OPERATION &

EXPERIENCES

DSTPS HAVE EXPERIENCE TO RUN BOTH UNITS (2X500MW) SUCCESSFULLY AT 55% RATED

CAPACITY.

RAMP UP RATE 1.2% & RAMP DOWN RATE 0.6% ACHIEVED SUCCESSFULLY.

DURING MTL FOLLOWING ISSUES ARE PROMINENT:- SOMETIMES MAJOR PROBLEMS FACED CAUSING HINDRANCE TO LOW LOAD OPERATION I.E. POOR

FLAME INTENSITY & FURNACE INSTABILITY DUE TO POOR COAL QUALITY

LOW FURNACE TO WB DP

LOW APH O/L TEMPERATURE

2ND TDBFP RE-CIRCULATION VALVE OPENING

STALLING OF 2ND FD FAN

HIGH CONDENSER VACUUM DURING PEAK WINTER: INCREASING TREND OF TG VIBRATION

EXPERIENCEs OF DSTPS ON FLEXIBLE OPERATION (UPTO 55%)

WBDP, COND. VACUUM & FG TEMP AT APH O/L DURING LOW LOADUNIT # 1 UNIT # 2

Date 10.02.20 11.02.20 12.02.20 13.02.20 10.02.20 11.02.20 12.02.20 13.02.20

Load(MW) 290 285 280 310 295 290 292 320

WBDP(MMWC) 60 58 55 70 50 48 48 60

COND VACCUM (BACK PR.) (KG/CM2)

0.048 0.049 0.049 0.0537 0.048 0.049 0.049 0.054

APH O/L FG (DEG) 114/117 111/113 109/112 114/116 101/103 103/105 106/108 108/109

Other than winter at same load Vacuum and Flue Gas temp AT APH outlet maintain in the range of 0.07 to 0.08 kg/cm2 and 115-120 deg C respectively.

SOME CRITICAL OPERATIONAL PARAMETERS OF DSTPS UNITS

FW

W

AT 3

0

to 4

5

MTR E

L

RW

W 3

0

MTR E

L

LH

S

WATER

WALL 4

5

MTR E

L

Rear

WW

AT 3

0 t

o 4

5 M

TR E

L

Left

WW

AT

45 M

TR E

L

FW

W A

T 3

0 t

o 4

5 M

TR

EL

FRONT WATER WALL AT

30 TO 45 METRE

ELEVATION

LEFT WATER WALL AT

45 METRE ELEVATION

REAR WATER WALL AT

30 TO 45 METRE

ELEATION

IMPACTS OF CYCLIC LOAD OPERATION OF DSTPS UNIT#1

MIGHT BE THE IMPACT OF CYCLIC LOAD

OPERATION : DEMAND MORE FREQUENCY OF

INSPECTION THAN NORMAL: IMPACT ON

COST

RH

front

Panel

Ext.

WW

LH

SW

W

BOILER TUBE LEAKAGE – WATER WALL AT DSTPS UNITs

RHS FRONT PANEL

EXT WATER WALL

LHS WATER WALL

BOILER TUBE LEAKAGE –WATER WALL AT DSTPS UNITS

RHS WATER TUBE NO. 37

WALL 45 MTR EL.

SAMPLE OF FAILED TUBE

PREVETIVE ACTION:

TAKING MORE

CONCENTRATION ON

BOILER WATER CHEMISTRY

I.E. CPU OPERATION,

INCREASE IN BOILER BLOW

DOWN FREQUENCY

PITTING OF LP TURBINE FIXED BLADES OF DSTPS UNIT#1

• MIGHT BE THE IMPACT OF LOW LOAD OPERATION AT HIGH CONDENSER VACUUM

• DEMANDS REVIEW OF FREQUENCY OF INSPECTION / OH SCHEDULE

• IMACT ON CAPITAL COST

• PRESENTLY IGEF IS GIVING SUPPORT SERVICE FOR MINIMUM LOAD TRIAL OPERATION

(40% OF RATED CAPACITY) FOR DSTPS UNIT#1 (500MW).

• DUE TO PRESENT COVID-19 ISSUE SUPPORT SERVICES ARE BEING PROVIDED THROUGH

VCs.

• DSTPS SHARED OPERATIONAL DATA FROM DCS FOR ANALYSIS BY IGEF EXPERTS.

• IGEF SHARED THE PROJECT REPORT OF SUCCESSFUL TRIAL OPERATION AT 40% RATED

CAPACITY OF ONE OF THE 500 MW UNITs OF NTPC, DADRI.

LOW LOAD (40% MINIMUM) TRIAL OPERATION

SUPPORT SERVICE BY IGEF FOR DSTPS

• PRE-TEST DATA ASSESSMENT REPORT & TEST PROCEDURE FOR MIN LOAD / FAST LOAD

RAMPS SUBMITTED BY IGEF EXPERTS & BRIEFED IN THE VC WITH DSTPS OFFICIALS.

PRELIMINARY OBSERVATION & RECOMMENDATION:

LOW LOAD (40% MINIMUM) TRIAL OPERATION

SUPPORT SERVICE BY IGEF FOR DSTPS

REMOTE CONNECTIVITY OF UNIT DCS WITH SIEMENS SPPA T 3000

SYSTEM.

BOILER COMBUSTION OPTIMISATION : COAL FLOW MEASUREMENT IN

ONE COAL ELEVATION

USE OF MIDDLE RANKING COAL FOR FLAME STABILITY

TUNING OF IMPORTANT AUTO LOOPS LIKE BOILER DRUM LEVEL, S/H

STEAM TEMP CONTROL, FURNACE TO W.B. DP CONTROL ETC.

DSTPS SHALL ACHIEVE THE

MISSION SUCCESSFUL

IN ATTAINING

40% MINIMUM LOAD SHORTLY

UNDER THE GUIDANCE OF IGEF

Thank You