NPRR #188 · Revision Request
NPRR188 MVA for SCED Input
ReasonMVA values from a TSP or any Market Participant are not used within State Estimator solutions except in the case of a Dynamic Rating. The ERCOT Energy Management System (EMS) is not designed to accept MVA values for equipment except as a Dynamic Rating. The ERCOT State Estimator, and subsequently contingency analysis, utilizes MW and Mega Volt-Amperes reactive (MVAr) Inter-Control Center Communications Protocol (ICCP) data to determine an MVA value which then may be passed to SCED if needed. The State Estimator/contingency analysis-determined MVA value is used to compare with the Market Participant provided ratings, including Dynamic Ratings, and is captured as a Real-Time sequence and SCED requirement pursuant to paragraph (1) (b) of Section 6.5.7.1.13. This NPRR also replaces CIM with Network Operations Model as Common Information Model (CIM) is a format. All MVA ratings are provided and are utilized by ERCOT in maintaining the reliability of the ERCOT Transmission Grid.
Created2009-07-23
Approved2009-09-15
Sections Affected
6.5.7.1.13
Summary
This Nodal Protocol Revision Request (NPRR) removes the Transmission Service Provider (TSP) requirement to provide MVA to be used in Real-Time sequence and Security-Constrained Economic Dispatch (SCED). This NPRR also corrects the use of Common Information Model (CIM) and corrects the Dynamic Rating requirement.
Action Log 4 milestones
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Sep 15
BOARDApproved
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Aug 25
PRSRecommended for Approval→ TAC Consideration
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Sep 3
TACRecommended for Approval→ ERCOT Board Consideration
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Jul 23
PRSRecommended for Approval→ PRS Impact Analysis Review
Documents 9
| Name | Type | Posted | Classification |
|---|---|---|---|
| 188NPRR-01 MVA for SCED Input 071009 | doc | Jul 10 '09 | Revision Request |
| 188NPRR-02 CEO Revision Request Review 071009 | doc | Jul 10 '09 | Revision Request Comments |
| 188NPRR-03 ERCOT Comments 072209 | doc | Jul 22 '09 | Revision Request Comments |
| 188NPRR-04 Austin Energy Comments 072209 | doc | Jul 22 '09 | Revision Request Comments |
| 188NPRR-05 PRS Recommendation Report 072309 | doc | Jul 24 '09 | Committee Report |
| 188NPRR-06 Impact Analysis 082009 | doc | Aug 20 '09 | Staff Report |
| 188NPRR-07 PRS Recommendation Report 082509 | doc | Aug 27 '09 | Committee Report |
| 188NPRR-08 TAC Recommendation Report 090309 | doc | Sep 3 '09 | Committee Report |
| 188NPRR-09 Board Action Report 091509 | doc | Sep 16 '09 | Committee Report |
Meetings That Took It Up 4
| Date | Meeting | Committee | Status |
|---|---|---|---|
| Sep 3 '09 | TAC Meeting | TAC | Concluded |
| Aug 25 '09 | PRS Meeting | PRS | Concluded |
| Aug 7 '09 | Credit Work Group Meeting | CREDITWG | Concluded |
| Jul 23 '09 | PRS Meeting | PRS | Concluded |