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Cascading Failure Analysis of Cyber-Physical Power Systems under Communication Congestion

It is inevitable that cascading failure occur in cyber-physical power systems (CPPS). With the deep integration of power grids and communication networks, the congestion of message packets in communication networks will aggravate the spread of cascading failure, even cause large-scale blackouts. Firstly, the topological and interactions characteristics between power grids and communication networks are analyzed, and a CPPS model is constructed based on the concepts of complex networks. Secondly, considering the congestion problem of message packets in the communication network, an optimal routing strategy of the betweenness centrality to capacity ratio tree (BCCT) approach based on publish-subscribe network (PSN) architecture is presented to reconstruct the transmission paths. Then, to reduce the spread of cascading failure, a cascading failure modeling method of CPPS based on direct current (DC) power flow and optimal routing strategy is studied. Finally, the IEEE 39-bus is used as a blueprint for simulation verification, and the results demonstrate the effectiveness and superiority of the proposed method in comparison with other approaches.