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Ensuring reliable operation of large power systems subjected to multipleoutages is a challenging task because of the combinatorial nature of theproblem. Traditional approaches for security assessment are often limited bytheir scope and/or speed, resulting in missing of critical contingencies thatcould lead to cascading failures. This paper proposes a two-componentmethodology to enhance power system security. The first component combines anefficient algorithm to detect cut-set saturation (called the feasibility test(FT) algorithm) with real-time contingency analysis (RTCA) to create anintegrated corrective action (iCA), whose goal is to secure the system againstcut-set saturation as well as critical branch overloads. The second componentonly employs the results of the FT to create a relaxed corrective action (rCA)to secure the system against post-contingency cut-set saturation. The firstcomponent is more comprehensive, but the latter is computationally moreefficient. The effectiveness of the two components is evaluated based upon thenumber of cascade triggering contingencies alleviated, and the computationtime. The results obtained by analyzing different case-studies on the IEEE118-bus and 2000-bus synthetic Texas systems indicate that the proposedtwo-component methodology successfully enhances the scope and speed of powersystem security assessment during multiple outages.

Mitigation of Saturated Cut-sets During Multiple Outages to Enhance Power System Security