Study on a Fast Controlled Partition Scheme Based on Improved Dinic Max-flow Strategy

When power system is subjected to severe disturbances and then will be out of step. The interconnected power grid should be split into several islands to avoid blackout. The controlled islanding is an active control technique based on the information from Wide Area Measurement System (WAMS) to accomplish the islanding task. This paper proposes a fast islanding strategy for large power networks. Firstly, the grid structure is mapped to point sets and edge sets in the graph theory. Secondly, the model is built by adopting the minimum power flow impact as the objective function and considering several constraints which includes generator coherency constraint and connective constraint. Finally, the optimal splitting strategy is searched by the improved Dinic maximum flow algorithm. Simulation results on IEEE 118-bus power system show that the proposed strategy is correct, effective and fast.