This document contains a study report on auxiliary power consumption (APC) at a thermal power station (TPS). It provides APC data for 7 generating units over two stages on a given date. The total APC for both stages was 9.49% of total generation. Charts show the average APC is higher for Stage I units compared to Stage II. Additional charts show the minimum loads required to achieve less than 8% APC for each unit, ranging from 186-213 MW. Partial loading and poor quality lignite are identified as reasons for higher APC percentages.

1. Study report on Auxiliary Power
Consumption in TPP
Prepared by Energy Manager / TPS II
M G Morshad , ADGM

2. STAGE I
(Date 28.09.16)
Date 28.09.16
Generation
(MU)
Average Load
(MW)
% APC APC (MU) APC (MW)
UNIT 1 4.614 192.25 8.46 0.390 16.26
UNIT 2 4.803 200.12 8.12 0.390 16.25
UNIT 3 4.850 202.08 8.54 0.414 17.26
TOTAL 14.267 594.45 8.37 1.195 49.77
Unit Consumption
1.195 MU
49.77 Ave MW
Station consumption
0.204 MU
8.52 Ave MW
Station ( Unit + Station) Consumption
1.399 MU
58.29 Ave MW
Station ( Unit + Station) APC ( %) 9.81%
STAGE II
(Date 28.09.16)
Date :28.09.16
Generation
(MU)
Average Load
(MW)
% APC APC (MU) APC (MW)
UNIT 4 4.710 196.25 7.96 0.375 15.62
UNIT 5 4.722 196.75 8.19 0.387 16.11
UNIT 6 4.729 197.04 7.96 0.376 15.68
UNIT 7 4.456 185.67 8.23 0.367 15.28
TOTAL 18.617 775.71 8.08 1.505 62.70
Unit Consumption
1.505 MU
62.70 Ave MW
Station consumption
0.218 MU
9.09 Ave MW
Station ( Unit + Station) Consumption
1.723 MU
71.79 Ave MW
% APC 9.25%
Typical Generation particulars

5. TPS II
(Date 28.09.16)
Total (Stage I + II) Generation
32.884 MU
1370.16 Ave MW
Total (Stage I + II)Unit Consumption
2.70 MU
112.47 Ave MW
Total (Stage I + II)Station consumption
0.42 MU
17.61 Ave MW
Total (Station + Unit) Consumption
3.122 MU
130.08 Ave MW
Station % APC 9.49%
Station %APC = [Fed to the bus (Export) – Station Consumption (Import)] / [Total Generation]
Typical Generation particulars

6. UAC - ST I SAC - ST I UAC - ST II SAC - ST II
AVE MW 49.00 8.50 62.00 9.09
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
MW
Typical - Average MW consumption
UAC – Unit Auxiliary Consumption
SAC – Station Auxiliary Consumption

7. Stage I Stage II
% UAC 8.38% 8.08%
%SAC 1.43% 1.17%
0.00%
1.00%
2.00%
3.00%
4.00%
5.00%
6.00%
7.00%
8.00%
9.00%
Comparative % UAC & % SAC
UAC & SAC of stage I units are higher than stage II units

8. HT LOAD CONSUMPTION
DESIGN
OPERATING
UNIT I UNIT II UNIT III
Date 28.09.2016 28.09.2016 28.09.2016
Time ( From - To) 11:30 To 12Hrs 11:30 To 12Hrs 11:30 To 12Hrs
UNIT LOAD 210 MW 203 213 210
KW KV PF FLC Amps KV KW Amps KV KW Amps KV KW
FD A 1400 6.6 0.85 145 45 6.6 435 55 6.6 531 54 6.6 522
FD B 1400 6.6 0.85 145 45 6.6 435 66 6.6 638 55 6.6 531
ID A 1800 6.6 0.81 195 181 6.6 1674 168 6.6 1554 188 6.6 1739
ID B 1800 6.6 0.81 195 175 6.6 1618 168 6.6 1554 184 6.6 1702
BFPA 3500 6.6 0.85 359 262 6.6 2558 0 6.6 0 0 6.6 0
BFP B 3500 6.6 0.85 359 0 6.6 0 274 6.6 2675 269 6.6 2626
BFP C 3500 6.6 0.85 359 262 6.6 2558 279 6.6 2724 288 6.6 2812
CEP A 515 6.6 0.83 54 43 6.6 408 0 6.6 0 0 6.6 0
CEP B 515 6.6 0.83 54 0 6.6 0 44 6.6 417 43 6.6 408
Mill A 710 6.6 0.82 76 0 6.6 0 48 6.6 450 46 6.6 431
Mill B 710 6.6 0.82 76 42 6.6 394 44 6.6 412 44 6.6 412
Mill C 710 6.6 0.82 76 41 6.6 384 44 6.6 412 47 6.6 441
Mill D 710 6.6 0.82 76 47 6.6 441 43 6.6 403 0 6.6 0
Mill E 710 6.6 0.82 76 47 6.6 441 44 6.6 412 44 6.6 412
Mill F 710 6.6 0.82 76 0 6.6 0 0 6.6 0 41 6.6 384
CWP A 1400 6.6 0.75 163 134 6.6 1149 133 6.6 1140 142 6.6 1217
CWP B 1400 6.6 0.75 163 138 6.6 1183 128 6.6 1097 142 6.6 1217
CWP C 1400 6.6 0.75 163 0 6.6 0 0 6.6 0 0 6.6 0
TOTAL MW 20.265 13.68 14.42 14.85
% APC 6.74% 6.77% 7.07%
Consumption MU 0.33 0.35 0.36
Total consumption (MU) 1.03

9. HT LOAD CONSUMPTION
DESIGN
OPERATING
UNIT - 4 UNIT - 5 UNIT - 6 UNIT-7
Date 28.09.2016 28.09.2016 28.09.2016 28.09.2016
Time ( From - To) 12:00 to 12:30 hrs 12:00 to 12:30 hrs 12:00 to 12:30 hrs 12:00 to 12:30 hrs
UNIT LOAD 210 MW 213 212 214 213
KW KV PF Amps Amps KV KW Amps KV KW Amps KV KW Amps KV KW
FD A 1200 6.6 0.81 130 57 6.5 520 70 6.5 638 54 6.5 492 65 6.5 593
FD B 1200 6.6 0.81 130 58 6.5 529 58 6.5 529 48 6.5 438 64 6.5 584
ID A 1800 6.6 0.8 197 147 6.5 1324 170 6.5 1531 155 6.5 1396 175 6.5 1576
ID B 1800 6.6 0.8 197 150 6.5 1351 160 6.5 1441 145 6.5 1306 170 6.5 1531
BFP A 4000 6.6 0.86 407 298 6.5 2885 300 6.5 2905 298 6.5 2885 263 6.5 2546
BFP B 4000 6.6 0.86 407 300 6.5 2905 0 6.5 0 0 6.5 0 0 6.5 0
BFP C 4000 6.6 0.86 407 0 6.5 0 310 6.5 3001 320 6.5 3098 301 6.5 2914
CEP A 600 6.6 0.78 67 52 6.5 457 0 6.5 0 0 6.5 0 54 6.5 474
CEP B 600 6.6 0.78 67 0 6.5 0 52 6.5 457 55 6.5 483 0 6.5 0
Mill A 600 6.6 0.69 76 0 6.5 0 48 6.5 373 44 6.5 342 50 6.5 388
Mill B 600 6.6 0.69 76 49 6.5 381 48 6.5 373 46 6.5 357 48 6.5 373
Mill C 600 6.6 0.69 76 43 6.5 334 51 6.5 396 0 6.5 0 49 6.5 381
Mill D 600 6.6 0.69 76 51 6.5 396 0 6.5 0 42 6.5 326 0 6.5 0
Mill E 600 6.6 0.69 76 48 6.5 373 45 6.5 350 46 6.5 357 50 6.5 388
Mill F 600 6.6 0.69 76 48 6.5 373 51 6.5 396 46 6.5 357 53 6.5 412
CWP A 1655 6.6 0.75 193 158 6.5 1334 170 6.5 1435 170 6.5 1435 161 6.5 1359
CWP B 1655 6.6 0.75 193 158 6.5 1334 160 6.5 1351 165 6.5 1393 160 6.5 1351
CWP C 1655 6.6 0.75 193 0 6.5 0 0 6.5 0 0 6.5 0 0 6.5 0
Total
MW
19.71 14.5 15.2 14.7 14.9
% APC 6.81% 7.16% 6.85% 6.98%
Consumption (MU) 0.35 0.36 0.35 0.36
Total consumption (MU) 1.42

10. Reasons for higher % APC
1.Partial loading of unit
2.Poor Lignite quality

11. 7.80
7.90
8.00
8.10
8.20
8.30
8.40
8.50
8.60
8.70
0.00 50.00 100.00 150.00 200.00 250.00
Break even % UAC - UNIT I
MW % UAC
172.75 8.59
181.31 8.45
193.23 8.30
197.88 8.17
200.58 8.17
202.50 8.02
209.83 7.97
212.79 7.85
For obtaining % UAC less than 8% - Unit 1 has to operated with load higher than 202 MW

12. 7.90
7.95
8.00
8.05
8.10
8.15
8.20
8.25
8.30
8.35
185.00 190.00 195.00 200.00 205.00 210.00 215.00
Break even % UAC – UNIT II
MW %UAC
190.88 8.27
195.86 8.29
207.96 8.07
209.58 8.00
213.01 7.94
For obtaining % UAC less than 8% - Unit 2 has to operated with load higher than 209 MW

13. 8.00
8.10
8.20
8.30
8.40
8.50
8.60
194.00 196.00 198.00 200.00 202.00 204.00 206.00 208.00 210.00 212.00 214.00
Break even % UAC – UNIT III
MW %UAC
196.73 8.57
199.44 8.50
201.59 8.42
205.05 8.37
209.97 8.29
212.20 8.07
For obtaining % UAC less than 8% - Unit 3 has to operated with load higher than 209 MW

14. 7.40
7.60
7.80
8.00
8.20
8.40
8.60
8.80
9.00
0.00 50.00 100.00 150.00 200.00 250.00
Break even %UAC - UNIT 4
MW %UAC
154.74 8.83
178.06 8.53
185.21 8.40
192.06 8.23
199.18 7.96
206.44 7.70
214.76 7.63
For obtaining % UAC less than 8% - Unit 4 has to operated with load higher than 192 MW

15. 0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
175.00 180.00 185.00 190.00 195.00 200.00 205.00 210.00 215.00
Break even % UAC- UNIT 5
MW %UAC
180.83 8.70
189.03 8.48
194.77 8.25
203.78 8.15
205.15 7.43
210.59 7.12
For obtaining % UAC less than 8% - Unit 5 has to operated with load higher than 203 MW

16. 7.00
7.20
7.40
7.60
7.80
8.00
8.20
8.40
185.00 190.00 195.00 200.00 205.00 210.00 215.00
Break even % UAC - UNIT 6
MW %UAC
186.41 8.32
193.19 7.93
198.77 7.88
204.61 7.56
213.59 7.17
For obtaining % UAC less than 8% - Unit 6 has to operated with load higher than 186 MW

17. 0
2
4
6
8
10
12
0 50 100 150 200 250
Break even % UAC - UNIT 7
MW %UAC
116.67 10.33
177.45 8.72
184.62 8.32
189.08 8.31
196.95 8.3
201.19 7.99
211.62 7.69
For obtaining % APC less than 8% - Unit 7 has to operated with load higher than 186 MW

18. UNIT 1 UNIT 2 UNIT 3 UNIT 4 UNIT 5 UNIT 6 UNIT 7
Series1 202 209 212 192 203 186 196
170
175
180
185
190
195
200
205
210
215
UnitLoad(MW) Break even load for obtaining %UAC less than 8%

19. UNIT 6 UNIT 4 UNIT 7 UNIT 1 UNIT 5 UNIT 2 UNIT 3
% UAC Trend
Highest Unit Auxiliary consumption in Unit -3
Lowest Unit Auxiliary Consumption in Unit - 6

20. 9.6
9.8
10
10.2
10.4
10.6
10.8
0 200 400 600 800 1000 1200 1400
Station % APC
MW APC
780.96 10.71
1048.73 10.39
1239.82 10.21
1308.43 9.74
1318.96 9.68
For obtaining Station % APC less than 10% - Plant to be operated with load
higher than 1240 MW

21. y = 214.6x2 - 432.4x + 227.0
R² = 0.065
9.15
9.20
9.25
9.30
9.35
9.40
9.45
9.50
0.990 0.995 1.000 1.005 1.010 1.015 1.020 1.025
APC
Poly. (APC)
MW SLC APC
1442 0.993 9.41
1482 0.993 9.28
1447 0.997 9.23
1413 1.002 9.46
1477 1.003 9.20
1466 1.006 9.35
1459 1.006 9.26
1457 1.008 9.26
1434 1.011 9.35
1481 1.011 9.28
1474 1.013 9.33
1473 1.017 9.23
1452 1.020 9.30
1466 1.021 9.28
1441 1.023 9.44

22. MW SLC APC
Actual % APC
(214.6x2 - 432.4x + 227.0)
Higher % APC due to
lignite quality
1442 0.993 9.41 8.64 0.77
1482 0.993 9.28 8.64 0.64
1447 0.997 9.23 8.61 0.62
1413 1.002 9.46 8.59 0.87
1477 1.003 9.20 8.59 0.61
1466 1.006 9.35 8.58 0.77
1459 1.006 9.26 8.58 0.68
1457 1.008 9.26 8.58 0.68
1434 1.011 9.35 8.58 0.77
1481 1.011 9.28 8.58 0.70
1474 1.013 9.33 8.58 0.75
1473 1.017 9.23 8.59 0.64
1452 1.020 9.30 8.60 0.70
1466 1.021 9.28 8.60 0.68
1441 1.023 9.44 8.61 0.83
Average variation in % APC due to lignite quality 0.71