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Slow Coherency Based Controlled Islanding in Large Power Systems

An integrated algorithm was developed to identify cutsets for large scale power systems for the application of slow coherency based controlled islanding schemes. The large scale power system was represented as a graph and a simplification algorithm was used to reduce the complexity of the system. Generators belonging to the same slowly coherent group were collapsed into a dummy node, and a graph partition library was used to split the graph into a given number of parts. Some extra islands formed by the partition library were merged into their adjacent large islands and the original cutset of the actual power system was recovered from the highly simplified graph. A software package was developed based on the algorithm, and dynamic simulations were run on the Western Electricity Coordinating Council (WECC) system to verify the effectiveness of the cutsets obtained.