Identifying Chains of Events during Power System Cascading Failure

A search strategy for identifying chains of events during power system cascading failure is proposed in this paper. This strategy corresponds to the study of overload of power lines and protective relaying hidden failures. By applying optimal power flow (OPF) technique to implement the optimal active and reactive power dispatching, and accordingly reduce the load losses caused by cascading events. Besides, a kind of under specific voltage load shedding strategy is presented to prevent system collapse caused by cascading events. Finally, a risk index is applied to evaluate cascading failure and identify serious chains of events. Simulations are carried on IEEE 30-bus system as benchmark to demonstrate the validity and effectiveness of the proposed model and method.