Cascading Failure Propagation in Cyber Physical Power Systems under Extreme Weather Events

With the rapid development of the energy Internet, the role of cyber networks in the power system has become more and more important. Considering both the cyber layer and the physical layer, the cyber-physical power systems (CPPS) have been introduced and studied in many researches. On the one hand, the cyber network strengthens the real-time monitoring and control capabilities of the power system. On the other hand, the deep coupling between the cyber layer and the physical layer adds new ways and modes of failure propagation. When suffering extreme weather events, such coupling relationship could lead to cascading failure propagation and have significant impacts on the system safety. This paper studies the cascading failure propagation of the CPPS under extreme weather events. First, the effect of extreme weather events on the initial fault state vector of the system nodes. Then, a node state influence matrix is proposed to analyze the cascading failure development process of the system starting from the initial failure state. Moreover, the solution method of the matrix based on optimization model of quadratic programming is given. Finally, an 8-node CPPS is adopted to verify the effectiveness of the proposed method.