Vulnerability Assessment of Cyber Physical Power System Based on Improved Cascading Failure Model

Aiming at the problem that the existing vulnerability assessment models ignore the state transformation of information nodes and delay effect of information network, an improved cascade failure model is proposed to assess the vulnerability of cyber physical power system. Firstly, the cyber physical power system model is established according to the topological structure and correlation of the network. Secondly, considering the overload state and recovery process of cyber nodes, as well as the physical layer power flow optimization and information flow redistribution in the process of fault propagation, an improved cascading failures model is established. Finally, the vulnerability index is established from the topological structure and the running state of the system to assess the vulnerability of the cyber physical power system. The simulation results show that the deliberate attack is more destructive to the system than the random attack, as well as that the fault propagation is faster. Moreover, the vulnerability of CPPS can be decreased by increasing the overload and recovery parameters within a certain limit.