ERCOT PUN Contingency Definitions and Trading Restrictions Overview
Discover the complexities of PUN contingency definitions and ERCOT trading restrictions as proposed by NPRR 832. Learn about PUN operator responses, load-resource dependencies, and examples of outages affecting PUN resources. Explore the challenges and considerations in managing PUN contingencies, including updates and commercial sensitivities. Find out how ERCOT handles constraints for existing PUN resources with local mitigation plans.
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Presentation Transcript
CRR/PTP Trading Restrictions As proposed by NPRR 832
PUN Contingency Definitions Contingencies at a PUN bus do not consider 1. PUN operator response, or 2. Load-Resource dependencies (e.g. process steam) For example, G-1 contingencies, that may be managed by the PUN, are not adequately considered in constraint definitions.
PUN Contingency Definitions Example Outage on 100MVA Line 100MVA Line PUN ~ 100 MW Resource 125MW Load In this example (which occurred, and contributed to RENA), the PUN is radial to the ERCOT system due to a scheduled outage. ERCOT enforced a G-1 contingency on the PUN resource to recognize, on a post-contingent basis, the PUN load could not be served by the radial line connecting the PUN to the ERCOT system. The Bus was priced at the shadow price cap, and did not impact the load zone price (LDF = 0.)
PUN Contingency Definitions Example Outage on 100MVA Line 100MVA Line PUN Steam ~ 100 MW Resource 125MW Load In reality, the PUN operator may: 1. Have consequential load that depends on steam to continue a process. Consequential load may reduce consumption following a resource contingency, or 2. Recognize that, post-resource contingency, the ERCOT system will be unable to serve plant load. Rather than risk relay / overcurrent separation from the ERCOT system, the operator may choose to manually manage PUN load at or below the line rating (similar to a RAP)
Complications with PUN Contingency Updates One size does not fit all Load-Resource Dependencies may be commercially sensitive Ability to reduce load may be commercially sensitive
ERCOT ignores constraints for existing PUNS A PUN resource with a local mitigation plan allowed ERCOT to de-activate an otherwise binding constraint (May 2017.)
