Meter Working Group Update to WMS
Loss Compensation For Joint Use Facilities addresses scenarios involving EPS meters at the Point of Interconnection (POI) and the compensation of losses in complex network configurations. Discussion includes compensation methods for meters behind the POI and potential challenges in determining line losses in private networks. Further exploration of options is deemed necessary by ERCOT and TDSPs.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
Meter Working Group Update to WMS APRIL 5, 2023 DOUG BRESHEARS
NPRR 945 Double Counting Scenarios Scenario for the double counting of energy flows EPS Metering Design Proposal submitted and approved for a generation site where load is netted with generation, and ERCOT assigns gen site net load to the ESI ID assigned to the gen site, and A separate ESI ID is established in ERCOT systems by the TDSP for the netted Load with the TDSP as the MRE, and Transactions submitted by the TDSP for the separate ESI ID includes any portion of the meter data that was also assigned to a gen site ESI ID populated by ERCOT during the gen site settlement process. Multiple options requiring protocol and system changes were discussed Current protocol language supporting the assignment of multiple ESIIDs to a generation facility was reviewed as a possible path forward. This would eliminate the concerns of double counting energy. The general consensus of the MWG was that the individual market participants could decide if the existing Protocol language can be used to eliminate the double counting of energy.
Loss Compensation For Joint Use Facilities For scenarios where there is an EPS meter at the POI and another EPS Meter behind the POI, all losses are captured by the POI meter, so any meters behind the POI should not be loss compensated, as trying to determine losses in complicated networks behind a generation site POI can be problematic. For scenarios where no EPS meter is at the POI, generation and load meters behind the POI should be loss compensated to the POI. The generation meter would be compensated by programming loss compensation in the meter. The load meter would be compensated by programming loss compensation in the meter, or the use of a fixed factor based on the loads maximum value. Concerns were raised about calculating the line loss in a private network. Topic will warrant further discussion as ERCOT and TDSPs consider additional options.
Composite Error Testing of Current Transformers Composite Error Testing is a method to derive the Ratio Correction Factor (RCF) and Phase Angle(PA). Per SMOG/ANSI for EPS metering CTs, RCF, and PA, must be determined by direct measurement, therefore Composite Error Testing is not acceptable for this application.
