October Project Release (NPRRs 710, 706, 698 and 595) ERCOT Operations & Market Operations WebEx Training October XX, 2015

October Project Release(NPRRs 710, 706, 698 and 595)

ERCOTOperations & Market Operations WebEx TrainingOctober XX, 2015

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Antitrust Admonition • ERCOT strictly prohibits Market Participants and their employees who are

participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, an electronic version is available at http://www.ercot.com/about/governance/index.html. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws.

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Overview

• October project release scheduled for October 22nd• NPRR595 – RRS Load Resource Treatment In ORDC• NPRR698 – Clarifications to NPRR595, RRS Load Resource Treatment In ORDC• NPRR706 – Restore the ability to use Physical Responsive Reserve Capability as an

Indicator of Available Frequency-Responsive Capacity• NPRR710 – Removal of ORDC Phase 2 Language and Modification to HASL Calculation

• Market notices went out on October 9th with release details• http://lists.ercot.com/scripts/wa-ercot.exe?A0=NOTICE_PRR_SCR

http://lists.ercot.com/scripts/wa-ercot.exe?A0=NOTICE_PRR_SCR


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Outline

I. NPRR 706a. Protocol review

b. NFRC Telemetry Examples

II. NPRR 710, Resource Limit Calculator Changea. Protocol review

b. HASL Calculation Examples

III. NPRRs 698 and 595a. Protocol review

b. Examples

IV. Questions

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• NPRR 527 (and NPRR 687) allow Generation Resources to send to ERCOT the portion of their HSL that represents non-dispatched power augmentation capacity as the new telemetry Non Frequency Responsive Capacity (NFRC). [Approved – 11/19/2013, 6/9/2015]

Background

Non-Frequency Responsive Capacity

The telemetered portion of a Combined Cycle Generation Resource’s HSL that represents the sustainable non-Dispatched power augmentation capability from duct firing, inlet air cooling, auxiliary boilers, or other methods which does not immediately respond, arrest, or stabilize frequency excursions during the first minutes following a disturbance without secondary frequency response or instructions from ERCOT.

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• NPRR 706 alters Physical Responsive Capability (PRC) calculation to exclude NFRC, so that PRC indicates only the frequency responsive headroom. [Approved – 8/11/2015]

NPRR 706 & PRC

Variable DescriptionPRC1 Generation On-Line greater than 0 MWPRC2 Hydro-synchronous condenser outputPRC3 RRS supplied from Load Resources controlled by high-set under-frequency relayPRC4 Capacity from Controllable Load Resources active in SCED and carrying Ancillary Service

Resource ResponsibilityPRC5 Capacity from Controllable Load Resources active in SCED and not carrying Ancillary

Service Resource ResponsibilityPRC Physical Responsive CapabilityRDF The currently approved Reserve Discount FactorLRDF_1 The currently approved Load Resource Reserve Discount Factor for Controllable Load

Resources carrying Ancillary Service Resource ResponsibilityLRDF_2 The currently approved Load Resource Reserve Discount Factor for Controllable Load

Resources not carrying Ancillary Service Resource ResponsibilityNFRC Non-Frequency Responsive Capacity

PRC1 = Min(Max((RDF*(HSL-NFRC) – Actual Net Telemetered Output)i , 0.0) ,

0.2*RDF*(HSL

–NFRC)i),

resourcesgenerationonlineAll

resourcegenerationonlinei

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A representation of the total amount of system wide On-Line capability that has a high probability of being able to quickly respond to system disturbances. 1. Control room operators monitor PRC for determining OCN, Advisory,

Watch and EEA.

2. Currently PRC includes available capability from Online Generation, Loads Resources and Hydro units on Synchronous Condenser mode.

3. PRC uses a Reserve Discount Factor (RDF) to account for effect of temperature on Generator Capability.

4. Conventional Generation Resources and Controllable Load Resources maximum contribution to PRC is limited to 20% of their HSL*RDF.

Why 20%? The Generator with a governor droop setting of 5% will provide 20% of its HSL as Governor Response if Frequency drops to 59.40 Hz from 60.00 Hz.

5. Hydro Resources operating under synchronous condenser fast response mode can contribute their full HSL*RDF towards PRC.

6. Non-Controllable Load Resources providing RRS is 100% counted towards PRC.

Physical Responsive Capacity (PRC)

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PRC Example

0500

100015002000250030003500400045005000550060006500700075008000850090009500

100001050011000115001200012500

MW

Time

NFRC Adjusted PRC for 8/10/2015

PRC Diff PRC NFRC Adjusted PRC

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• NPRR 687 approved Generation Resources to send to ERCOT the portion of their HSL that represents non-dispatched power augmentation capacity as the new telemetry Non Frequency Responsive Capacity (NFRC).

• NFRC can include any unloaded power augmentation capability from the following:

– Duct firing– Auxiliary boilers that augments the HSL capacity

• NFRC cannot include the following:– Steam Turbine of a Combined Cycle Plant– Any method that supplements efficiency of Combustion Turbine

• Chillers or Inlet air cooling

• NFRC must dynamically change as output from Generation Resource changes.

NFRC Telemetry

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NFRC Telemetry Example #1

0

1

2

3

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL CCC

CC on start-up.

CC switches to full train configuration.

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0

1

2

3

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL ST1 CT1 CT2 CCC


Duct burners enabled.

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0

1

2

3

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL NFRC NPF ST1 CT1 CT2 CCC


Duct burners enabled.

13

0

1

2

3

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL NFRC NPF ST1 CT1 CT2 CCC


HSL reflects the base load capacity of the 2 CTs.

NFRC should be 0. ST online, NFRC included in ST capacity and in HSL.

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0

0.5

1

1.5

2

2.5

0

50

100

150

200

250

300

Confi

gura

tion

(CCC

)

MW

HSL NFRC NPF CT1 ST1 CCC


CT fully loaded before duct burners enabled.

1x1 CC. NFRC = 0 and not included in HSL.

Duct burners enabled and included in HSL.

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0

1

2

3

4

5

6

7

8

9

10

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL CCC


CC switches from 2x0 to 3x1 configuration.

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0

1

2

3

4

5

6

7

8

9

10

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL ST1 GT1 GT2 GT3 CCC


CT & ST ramp up.Duct burners are fired.

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0

1

2

3

4

5

6

7

8

9

10

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL NFRC NPF ST1 GT1 GT2 GT3 CCC


Non-zero NFRC telemetry when ST is off-line.

NFRC reduces as duct burners are fired.

HSL reflects capacity of CT, ST and duct burners

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0

1

2

3

4

5

6

7

8

9

10

0

100

200

300

400

500

600

700

Confi

gura

tion

(CCC

)

MW

HSL NFRC NPF ST1 GT1 GT2 GT3 CCC


NFRC should be 0 when ST and duct burner capacity not reflected in HSL.

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NPRR 710, Protocol Review

• NPRR 710, Removal of ORDC Phase 2 Language and Modification to HASL Calculation

• Removed ORDC Phase 2 language• Added language, highlighted below, in the Resource Limit Calculator (RLC) to adjust the High Ancillary

Service Limit (HASL) for Non-Frequency Responsive Capacity (NFRC) if a resource has a non-zero Responsive Reserve Schedule (RRS)

• 6.5.7.2 Resource Limit Calculator• (1) ERCOT shall calculate the HASL, LASL, SURAMP, SDRAMP, HDL and LDL within four seconds after a change of the Resource-specific

attributes provided as part of the QSE’s SCADA telemetry under Section 6.5.5.2, Operational Data Requirements. The formulas described below define which Resource-specific attributes must be used to calculate each Resource limit. The Resource limits are used as inputs into both the SCED process and the Ancillary Service Capacity Monitor as described in Section 6.5.7.6, Load Frequency Control. These Resource limits help ensure that the deployments produced by the SCED and Load Frequency Control (LFC) processes will respect the commitment of a Resource to provide Ancillary Services as well as individual Resource physical limitations.

(3) For Generation Resources, HASL is calculated as follows:

HASL = Max (LASL, (HSLTELEM – (RRSTELEM + RUSTELEM + NSRSTELEM + NFRCTELEM)))

Variable Description

HASL High Ancillary Service Limit.

HSLTELEM High Sustained Limit provided via telemetry – per Section 6.5.5.2.

LASL Low Ancillary Service Limit.

RRSTELEM Responsive Reserve Ancillary Service Schedule provided by telemetry.

RUSTELEM Reg-Up Ancillary Service Resource Responsibility designation provided by telemetry.

NSRSTELEM Non-Spin Ancillary Service Schedule provided via telemetry.

NFRCTELEM NFRC currently available (unloaded) and included in the HSL of the Generation Resource with non-zero Responsive Reserve Ancillary Service Schedule telemetry.

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• NPRR 710 – Removes ORDC phase 2 language– Changes High Ancillary Sustained Limit (HASL) calculation in Protocol section 6.5.7.2 to

conditionally exclude NFRC

– Note that HASL changes only when RRS Schedule is non-zero, i.e.• IF RRSC = 0 THEN HASL = Max (LASL, (HSLTELEM – (RRSTELEM + RUSTELEM + NSRSTELEM )))• ELSE


NPRR 710 – Protocol Review


Variable DescriptionHASL High Ancillary Service Limit.HSLTELEM High Sustained Limit provided via telemetry – per Section 6.5.5.2. LASL Low Ancillary Service Limit.RRSTELEM Responsive Reserve Ancillary Service Schedule provided by telemetry. RUSTELEM Reg-Up Ancillary Service Resource Responsibility designation provided

by telemetry.NSRSTELEM Non-Spin Ancillary Service Schedule provided via telemetry.NFRCTELEM NFRC currently available (unloaded) and included in the HSL of the

Generation Resource with non-zero Responsive Reserve Ancillary Service Schedule telemetry.

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NPRR 710 HASL Examples when NFRC > 0

1. On-line Resource w/wo RRS Schedule telemetry

2. On-line Resource telemetering non-zero Reg-Up and w/wo RRS Schedule telemetry

HSL 200 200RRSC 0 20

Reg-Up 20 20NSSC (NSRS=0) 0 0

NFRC 30 30Current-HASL 180 160

710-HASL 180 130

HSL 200 200RRSC 0 20

Reg-Up 0 0NSSC (NSRS=0) 0 0


710-HASL 200 150

HSL High Sustained LimitRRSC Responsive Reserve Service Schedule

Reg-Up Regulation Up Service ResponsibilityNSSC Non-Spin Service ScheduleNSRS Non-Spin Service ResponsibilityNFRC Non-Frequency Responsive Capacity

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1. On-line Resource telemetering a non-zero NSRS, a zero NSSC and w/wo RRS Schedule telemetry (On-line non-spin part of the energy offer curve >= $75/MWh)

2. On-line Resource telemetering non-zero Reg-Up, a non-zero NSRS, a zero NSSC and w/wo RRS Schedule (On-line non-spin part of the energy offer curve >= $75/MWh)


HSL 200 200RRSC 0 20

Reg-Up 0 0NSSC (NSRS≠0) 0 0


710-HASL 200 150

HSL 200 200RRSC 0 20



710-HASL 180 130



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1. On-line Resource telemetering a non-zero NSRS, a non-zero NSSC and w/wo RRS Schedule telemetry

2. On-line Resource telemetering non-zero Reg-Up, a non-zero NSRS, a non-zero NSSC and w/wo RRS Schedule telemetry


HSL 200 200RRSC 0 20



710-HASL 160 110

HSL 200 200RRSC 0 20



710-HASL 180 130



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NPRR 698 and 595, Protocol Review

• NPRR 698, Clarifications to NPRR595, RRS Load Resource Treatment In ORDC• NPRR595 and NPRR698 adjusts the Ancillary Service Imbalance calculation used for the

ORDC to account for additional capacity from Load Resources controlled by high set under frequency relays providing Responsive Reserve above their RRS Responsibility up to 150% of their telemetered RRS Responsibility.

• When deployed for unannounced testing or as part of the response in an emergency condition, the Load Resource will receive a unit specific XML deployment instruction.

• XML message sent to Load Resources other than Controllable Load Resources for manual deployment of Responsive Reserve Service will be updated to show a value (MW) calculated as follows.

• XML Instruction = min(max(RRS Responsibility, Net Power Consumption – Low Power Consumption), 150% of RRS Responsibility)

• Currently, the XML message shows a value (MW) equal to the Net Power Consumption – Low Power Consumption.

• Compliance will be measured using the actual response compared to the XML instruction.

• Note: All payments are made on telemetry values not on COP values• Section 3.9 language change will remain grey boxed for this release (NPRR 735 proposes deletion of grey box

language)

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NPRR 698 and 595, Example

1. On-line Load Resources controlled by high set under frequency relay providing Responsive Reserve

• ORDC MW are credited in the Ancillary Service Imbalance for the QSE (Section 6.7.4)

2. On-line Load Resources controlled by high set under frequency relay providing Responsive Reserve deployment example:

• XML message for resource above MW value:• min(max(RRS Responsibility, Net Power Consumption – Low Power Consumption), 150% of RRS Responsibility)• Example A: min(max(100, 110) 150) = 110 MW• Example B: min(max(100, 200) 150) = 150 MW• Example C: min(max(100, 90) 150) = 100 MW• Performance monitoring will be done on value in xml message (Protocol section 8.1.1.4.2)

Example A B CMPC 200 200 200LPC 0 0 0NPC 110 200 90RRS 100 100 100

Current ORDC MW 0 0 0Post 698 ORDC MW 10 100 -10

MPC Maximum Power ConsumptionLPC Low Power ConsumptionNPC Net Power ConsumptionRRS Responsive Reserve Responsibility

ORDC Operating Reserve Demand Curve

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Questions and Additional Information

• October project release scheduled for October 22nd• NPRR595 – RRS Load Resource Treatment In ORDC• NPRR698 – Clarifications to NPRR595, RRS Load Resource Treatment In ORDC• NPRR706 – Restore the ability to use Physical Responsive Reserve Capability as an

Indicator of Available Frequency-Responsive Capacity• NPRR710 – Removal of ORDC Phase 2 Language and Modification to HASL Calculation

• Client Services for Market Participants– 512-248-3900

[email protected]

• Market notice archive• http://lists.ercot.com/scripts/wa-ercot.exe?A0=NOTICE_PRR_SCR

mailto:[email protected]


Documents

October Project Release (NPRRs 710, 706, 698 and 595) ERCOT Operations & Market Operations WebEx Training October XX, 2015