Power Systems Engineering Research Center

Project Summaries

Power Markets

Risk Assessment of Constraint Relaxation Practices (M-34)

Summary System operators allow various constraints within market models to be relaxed, i.e., the constraint can be violated for a set penalty price. These relaxations are generally corrected by operators (for example, the operator will commit additional generation to avoid an IROL violation that occurs in a market model due to a constraint relaxation); however, some of these relaxations occur during actual operations (there can be an IROL violation, as well as other types of violations, in real-time due to this constraint relaxation practice). This proposed project is an extension of PSERC Project M-29. The goal of this project is to analyze the following concerns raised by industry advisors: 1) should we treat pre-contingency limit relaxations different than post-contingency limit relaxations; 2) how does the duration of the violation impact reliability and what risk are we exposed to; 3) how should we incorporate probabilities of contingencies within this practice; 4) what is the impact on stability; and 5) how does this practice relate to a risk-based optimal power flow dispatch.
Academic Team Members Project Leader: Kory Hedman (Arizona State University, Kory.Hedman@asu.edu)
Team members: Vijay Vittal (Arizona State University, Vijay.Vittal@asu.edu)
James McCalley (Iowa State University, jdm@iastate.edu)
Industry Team Members Khosrow Moslehi (ABB), Chien-Ning Yu (ABB), David Gray (Alstom Grid), Xing Wang (Alstom Grid), Jim Price (CAISO), Bob Entriken (EPRI), Mahendra Patel (EPRI), Erik Ela (EPRI), Jinan Huang, (IREQ Hydro Quebec), Feng Zhao (ISO-NE), Yonghong Chen (MISO), Marissa Hummon (NREL), Muhammad Marwali (NYISO), Vikas Dawar (NYISO), Michael Swider (NYISO), Nivad Navid (PG&E), Alva Svoboda (PG&E), Hong Chen (PJM), Jay Liu (PJM), Juan Castaneda (SCE), Joseph Yan (SCE), Doug Bowman (SPP), Thomas Burns (SPP), Jay Caspary (SPP), Melanie Hill (SPP), Harvey Scribner (SPP)