1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education (Shanghai Jiao Tong University), Shanghai 200240, China;2.School of Electrical Engineering, Guangxi University, Nanning 530004, China

Conducting research on cascading failure defense is of great significance for ensuring the safe and stable operation of power systems. This paper proposes a cascading failure blocking method based on the coordination of multiple types of source-network-load-storage resources, aiming to address the problems of high economic cost and blackout risk caused by the one-sided consideration of factors in the fault stage selection method for implementing existing blocking strategies and the insufficient coordination of multiple types of resources. First, considering the characteristics of phased load loss during the cascading evolution of faults, an improved fault chain risk assessment index is established. Then, considering the system response capability to fault cascading propagation and the degree of risk increase at different fault stages, a selection method for the implementation stage of blocking strategies based on the time-risk integrated importance is constructed. Finally, considering the mechanism and complementary potential of resources on the source, network, load, and storage sides in cascading failure blocking, a coordinated cascading failure blocking model is proposed that integrates the characteristics of multi-type power output regulation on the source side, the flexible adjustment capability of the transmission network topology on the network side, the graded supply guarantee requirements for loads of different importance on the load side, and the rapid response characteristics of energy storage equipment. Simulation results show that applying the proposed blocking method at the selected fault stages can effectively reduce the blackout risk caused by cascading failures and significantly improve the economy of the blocking strategy and the safety of the power system.