1. BAL-001-TRE-1 Primary Frequency Response Update for Texas RE RSC
October 3, 2012

2. SAR-003 Standard Drafting Team
Name
Company
Sydney Niemeyer (Chair)
NRG Energy
Ananth Palani (Vice-Chair)
Optim Energy
Pamela Zdenek
Infigen Energy
Vann Weldon
ERCOT
Brenda Hampton
Luminant
Sandip Sharma
ERCOT (Non-voting SME)
BAL-001-TRE-1 RSC October 3, 2012

3. Requirements Overview
Applies to BA, GO and GOP function
Provides requirements for:
Identifying Frequency Measureable Events (FME)
Calculating the Primary Frequency Response (PFR) of each resource in the Region
Calculating the Interconnection minimum Frequency Response
Monitoring the actual Frequency Response of the Interconnection
Setting Governor deadband and droop parameters
Providing Primary Frequency Response performance requirements.
Importantly, the standard narrows the governor deadband and requires the droop curve to begin at the edge of the deadband with no step function.
BAL-001-TRE-1 RSC October 3, 2012

4. PFR Performance Measures
Under this standard, two Primary Frequency Response performance measures are calculated: “initial” and “sustained.”
The initial PFR performance (R9) measures the actual response compared to the expected response in the period from 20 to 52 seconds after an FME starts.
The sustained PFR performance (R10) measures the best actual response from t(46) to t(60), compared to the expected response at t(46).
BAL-001-TRE-1 RSC October 3, 2012

5. Primary Frequency Response Reference Document
This Primary Frequency Response Reference Document is not considered to be a part of the regional standard.
This document will be maintained by Texas RE and will be subject to modification as approved by the Texas RE Board of Directors, without being required to go through the formal Standard Development Process.
This arrangement provides Regional flexibility in adjusting the technical details of the performance metric calculations.
The PFR Reference Document includes flowcharts that detail the calculations
BAL-001-TRE-1 RSC October 3, 2012

6. PFR Reference Document Revision Process
A Revision Request may be submitted to the Texas RE Reliability Standards Manager
The Reliability Standards Committee (RSC) will consider the request
The revision request will be posted in accordance with RSC procedures
The RSC shall discuss the revision request in a public meeting, and will accept and consider verbal and written comments pertaining to the request
The RSC will make a recommendation to the Texas RE Board of Directors
The Board may adopt the revision request, reject it, or adopt it with modifications
Any approved revision to the Primary Frequency Response Reference Document shall be filed with NERC and FERC for informational purposes
BAL-001-TRE-1 RSC October 3, 2012

7. Technical Document – Initial Flowchart Overview
Read Deadband, Droop, HSL, Capacity and Actual Frequency
Calculate Ramp Magnitude
Calculate Expected Primary Frequency Response
Calculate Actual Primary Frequency Response
Calculate P.U. Primary Frequency Response
Calculate P.U. Primary Frequency Response Rolling Average No
Is Rolling Avg ≥ 0.75
Fail R9
Yes
End
Pass R9
BAL-001-TRE-1 RSC October 3, 2012

8. Based on events from June 2011 to June 2012.
Field Trial Results
28 generating units were evaluated in the trial, which included 7 coal, 4 gas, 2 simple cycle combustion turbine, 5 wind, and 10 combined cycle units.
Based on events from June 2011 to June 2012.
No high-frequency events were evaluated.
8-event average was not possible with some units.
These results use NEW R10 calculation.
BAL-001-TRE-1 RSC October 3, 2012

9. Field Trial Results – Coal Units
BAL-001-TRE-1 RSC October 3, 2012

10. Field Trial – Gas Units
BAL-001-TRE-1 RSC October 3, 2012

11. Field Trial – Wind Units
BAL-001-TRE-1 RSC October 3, 2012

12. Field Trial – Combined Cycle Units
BAL-001-TRE-1 RSC October 3, 2012

13. Changes Made after Field Trial and Comments
Changed Sustained Measure (R10) from average over several minutes to instantaneous at t(46).
Too much happens during former averaging window.
Added 2 MW limit to the 2% exception criteria.
Applies to generators < 100 MW.
Moved examples of “legitimate operating conditions that may support exclusion” from Measures to Requirements (R9 and R10).
M7 re-written to focus on notice from GO to GOP of change in Governor status.
Avoids concern about 24/7 proof issue.
Changed deadband setting from to Hz.
Reformatted R2 to break into sub-requirements.
Intend to deal with augmented capacity issue.
Duct burners, etc.
BAL-001-TRE-1 RSC October 3, 2012

14. Implementation Plan 12 months after Effective Date
The BA must be compliant with Requirement R1
At least 50% of the GO’s generating units/generating facilities must be compliant with Requirement R6 (if >1 unit/facility)
At least 50% of the GO’s generating units/generating facilities must be compliant with Requirement R7 (if >1 unit/facility)
The GOP must be compliant with Requirement R8
18 months after Effective Date
The BA must be compliant with Requirements R2, R3, R4, and R5
100% of the GO’s generating units/generating facilities must be compliant with Requirement R6
100% of the GO’s generating units/generating facilities must be compliant with Requirement R7
BAL-001-TRE-1 RSC October 3, 2012

15. Implementation Plan 24 months after Effective Date
At least 50% of the GO’s generating units/generating facilities must be compliant with Requirement R9 (if >1 unit/facility)
At least 50% of the GO’s generating units/generating facilities must be compliant with Requirement R10 (if >1 unit/facility)
30 months after Effective Date
100% of the GO’s generating units/generating facilities must be compliant with Requirement R9
100% of the GO’s generating units/generating facilities must be compliant with Requirement R10
BAL-001-TRE-1 RSC October 3, 2012

16. Drafting Team is finishing standard and related documents.
Path Forward
Drafting Team is finishing standard and related documents.
Expect completion in November. (11/7 SDT Mtg.)
Submit for RSC approval in November.
Can do by or call a special meeting.
Post for Review and Ballot in December – January.
Avoid ballot during Holidays.
RSC Approves ballot results.
TRE Board approval.
NERC/FERC process.
BAL-001-TRE-1 RSC October 3, 2012

18. R9: Initial Response Performance - Steam Turbine
BAL-001-TRE-1 RSC October 3, 2012

19. R10: Sustained Response Performance - Steam Turbine
BAL-001-TRE-1 RSC October 3, 2012

20. R9: Initial Response Performance - Steam Turbine
BAL-001-TRE-1 RSC October 3, 2012

21. R10: Sustained Response Performance - Steam Turbine
BAL-001-TRE-1 RSC October 3, 2012

22. R9: Initial Response Performance - Steam Turbine
BAL-001-TRE-1 RSC October 3, 2012

23. R10: Sustained Response Performance - Steam Turbine while Ramping up before and during event
BAL-001-TRE-1 RSC October 3, 2012

24. R9: Initial Response Performance - Combustion Turbine with below standard performance
BAL-001-TRE-1 RSC October 3, 2012

25. R10: Sustained Response Performance – Combustion Turbine with below standard performance
BAL-001-TRE-1 RSC October 3, 2012