Risk assessment of power grid cascading failure considering system operation conditions

In bulk power systems,cascading failures initiated by common events often lead to blackouts.In this paper,a new simulation model of cascading failure is established to investigate the law that the faults spread in power grids,to estimate the outage risk and loss of cascading failures and to recognize the key elements which initiate the cascading faults.The system load conditions, weather conditions, hidden failures of the protective relays are considered in this model.The proposed method can be used to identify the key lines triggering cascading faults in different situations,and get the risk indices of cascading failure in a certain operating state.The application results on the IEEE-RTS and IEEE-57 bus system validate the effectiveness of the proposed method.