ERCOT Congestion Management Working Group Updates
The ERCOT Congestion Management Working Group discussed various topics such as reviewing constraint management processes, implementing the Not-to-Exceed method for efficient control of GTCs, and analyzing congestion at the cap during a recent event. The group aims to improve processes, reduce transmission constraint violations, and enhance reliability in ERCOT's grid operations. The upcoming meeting on September 20 will further delve into these key areas.
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Congestion Management Working Group SEPTEMBER 1, 2021
TAC Emergency Conditions Item No. 51/86 o Review constraint management process during EEA3: How much generation was curtailed for congestion including GTCs during EEA3? o The remaining item to be discussed is how to clarify ERCOT s procedures on the process: oReducing from double circuit to single circuit oUse of a 15-minute emergency rating
OBDRR 026, Change Shadow Price Caps to Curves and Remove Shift Factor Threshold o This item will be taken up in September o ERCOT provided a presentation on the August CMWG meeting page
Improving Efficient Control of GTCs o ERCOT introduced the Not-to-Exceed (NTE) method o Under this concept, Intermittent Renewable Resources (IRRs) behind a binding GTC with a considerable impact should not exceed their SCED basepoint when the NTE is activated o Some of the benefits ERCOT stated include: oERCOT should be able to bind at a higher limit, resulting in more MW production from IRRs behind IROL when binding oKeeps ERCOT from exceeding SOLs and IROLs oMore efficient way of meeting reliability requirements o Next month we will review draft protocol and SCR language
Congestion at the Cap o During the February event, there were units that offered at the cap that were not able to be dispatched due to congestion. o ERCOT conducted an analysis and scenario to see how SCED would react. o The result summary showed that: oSCED will solve under the scenario oTransmission Constraint violations would be reduced oMost Resources would have lower Base Points o As a follow-up, ERCOT will come back with a scenario of the distribution of shift factors associated with the 7000 MW not dispatched as well as the impact of a higher Power Balance Penalty Curve (PBPC).
Next Meeting: September 20 o Item No. 86 - Review constraint management process during EEA3: How much generation was curtailed for congestion including GTCs during EEA3? o OBDRR 026 o Improving Efficient Control of IRRs to Manage GTCs o Congestion at the Cap
