ERCOT Pilot Project for Fast Responding Regulation Service (FRRS)

PDCWGMay 30, 2013

2

Objective

• Summary of Findings

• Questions for PDCWG

• Conventional Regulation Deployment and Frequency

• FRRS Up and FRRS Down performance

• FRRS-Pilot Resource’s ability to respond to sudden large frequency

deviation

• Measuring ERCOT deployed FRRS-up against rate of change of

Frequency and Regulation-up deployment

• Stakeholder Review Process

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Summary of FindingsBased on the first three months of observations;

1.The introduction of FRRS improves ERCOT’s ability to arrest frequency decay during unit trips.

2.FRRS Pilot Resources successfully followed ERCOT FRRS deployments  and responded automatically using local frequency detecting techniques.  

3.When deployed, FRRS reduces the rate of change of frequency and regulation deployed to conventional Resources.

4.Observed lower offer amounts for FRRS-down and an overall lower performance for FRRS-down.

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Questions for the PDCWG

1. Can FRRS be part of Regulation Service?

2. If so, how much FRRS can participate in

Regulation Service?

3. If so, are there any recommended changes to

deployment logic of the pilot and what performance

criteria are recommended

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Conventional Regulation deployment and Frequency

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Response from Conventional Resource

59.84

59.86

59.88

59.9

59.92

59.94

59.96

59.98

60

60.02

60.04

350

365

380

395

410

425

440

455

470

485

500

20:13:12 20:13:55 20:14:38 20:15:22 20:16:05 20:16:48 20:17:31

Frequency

MW

Conventional Unit Expected Generation Conv Unit Output Frequency

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Response from FRRS Resource

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0

3

6

9

12

15

18

21

24

27

30

59.84

59.86

59.88

59.9

59.92

59.94

59.96

59.98

60

60.02

60.04

20:13:12 20:13:55 20:14:38 20:15:22 20:16:05 20:16:48 20:17:31

MW

Frequency

Frequency FRRS Deployment FRRS Resource Output

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Response from Conventional and FRRS Resources

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

350

360

370

380

390

400

410

420

430

440

450

460

470

480

490

500

20:13:12 20:13:55 20:14:38 20:15:22 20:16:05 20:16:48 20:17:31

FRRS MW Output

Conventional Resources MW

Conventional Unit Expected Generation Conv Unit Output FRRS Deployment FRRS Resource Output

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FRRS Performance

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05-22-2013 Frequency event

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59.7

59.72

59.74

59.76

59.78

59.8

59.82

59.84

59.86

59.88

59.9

59.92

59.94

59.96

59.98

60

-5000

-2500

0

2500

5000

7500

10000

12500

15000

17500

20000

22500

25000

27500

30000

32500

21

:11

:02

21

:11

:05

21

:11

:07

21

:11

:10

21

:11

:12

21

:11

:15

21

:11

:17

21

:11

:20

21

:11

:23

21

:11

:25

21

:11

:28

21

:11

:30

21

:11

:33

21

:11

:35

21

:11

:38

21

:11

:41

21

:11

:43

21

:11

:46

21

:11

:48

21

:11

:51

21

:11

:53

21

:11

:56

21

:11

:59

21

:12

:01

21

:12

:04

21

:12

:06

21

:12

:09

21

:12

:11

21

:12

:14

21

:12

:17

21

:12

:19

21

:12

:22

21

:12

:24

21

:12

:27

21

:12

:29

21

:12

:32

21

:12

:35

21

:12

:37

21

:13

:01

21

:13

:04

21

:13

:06

21

:13

:09

FrequencyKW

KW Frequency

11

03-30-2013 High Frequency Event

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60 Hz

Frequency FRRS-Up Deployed FRRS Response

12

Frequency FRRS-Up Deployed FRRS Response Regulation Deployed

Effect of FRRS-Up on Frequency and Reg-Up

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60 Hz

13

FRRS Impact on RoCoF

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FRRS Impact on Reg-Up Deployment

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Stakeholder Review Process

• ERCOT discussed progress of FRRS-pilot and some performance data with ETWG and PDCWG in March, April and May 2013

• More discussions in June with the various subcommittees (ID options)

• TAC July 2 (Update on Pilot and outline options)

• BOD July 16 (Present update and options)

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Questions?

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Appendix

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Purpose of FRRS PilotThe pilot governing document states the purpose of the pilot project is to:  1.Determine whether FRRS can improve ERCOT’s ability to arrest frequency decay during unit trips

2.Determine the optimal means of deploying FRRS by testing various deployment methodologies

3.Determine whether FRRS can reduce the need for Regulation Service and thereby reduce total Ancillary Service costs

4.Assess the operational benefits and challenges of deploying FRRS

5.Provide data for ERCOT to determine the appropriate settlement treatment for Resources providing FRRS, including possible “pay-for-performance” methods such as those being developed in response to FERC Order 755.

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FRRS Pilot Overview• FRRS pilot deployment obligations began on Feb.

25, 2013 at hour ending 11. • When the pilot began, there were 32 MW FRRS UP

and 30 MW FRRS DOWN qualified to participate.• Additional 1 MW FRRS UP and DOWN began

participating on Mar. 16, 2013.• All the qualified resources completed the

qualification tests.• ERCOT has made FRRS parameter changes twice

and more parameter changes are expected during the course of pilot

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Log of Parameter Changes

FAST RESPONDING REGULATION SERVICE PILOT PROJECT PARAMETER SETTINGS

Effective Date and TimeOperating Day 2-

25-13 HE 11Operating Day 3-

30-13 HE 1Operating Day

4-13-13 HE 1Band 1 High Trigger Frequency (Hz) 60.03 60.02 60.025Band 2 High Trigger Frequency (Hz) 60.05 60.05 60.05Band 3 High Trigger Frequency (Hz) 60.09 60.09 60.09Band 1 Low Trigger Frequency (Hz) 59.97 59.98 59.975Band 2 Low Trigger Frequency (Hz) 59.95 59.95 59.95Band 3 Low Trigger Frequency (Hz) 59.91 59.91 59.91

Capacity Deployment in Band 1 (%) 50 50 50Maximum Deployment Time per

Band (sec) 120 60 60

Recall Interval (sec) 12 12 12Single Event Reset High Trigger

Frequency (Hz)60.01 60.01 60.01

Single Event Reset Low Trigger Frequency (Hz)

59.99 59.99 59.99ERCOT PDCWG5/30/2013

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Impact on Reg-up in Feb 2013

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April and May 2013 Performance

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April, 2013 FRRS-UP FRRS-DOWN

FRRS Resource A 98.51% 64.77%

FRRS Resource B 77.78% 100.00%

Total Average 88.15% 82.39%

May 1 – May 20, 2013 FRRS-UP FRRS-DOWN

FRRS Resource A 97.61% 50.00%

FRRS Resource B 60.15% 74.69%

Total Average 78.88% 62.34%

Date Range Feb 25 - May 20

FRRS Service MwH Awarded Performance Overall RateTotal RegDN 7,167 4,750 66%Total RegUP 48,206 45,378 94%

FRRS MwH Awards vs Actual Performance