Vulnerability Assessment of Distribution Networks in the Context of Cyber Attacks

With the development of information technology, the means of network attack are also increasing and becoming stronger, and can not realize the complete defense of network attack in the real sense. Therefore, it is very important to evaluate the system vulnerability under network attack. In the context of cyber attacks, optimize the failure models of information nodes and grid nodes in the distribution network cyber physical system, and conduct vulnerability assessment research. Considering the overload state of information nodes and the rapid recovery process of information nodes, establish a failure model for the association between information nodes and physical nodes in the power grid, and establish vulnerability assessment indicators Based on IEEE 118 nodes and Barabasi-Albertmodel(BA) scale-free network, simulation calculations were conducted to compare and analyze the vulnerability index results under different evaluation methods. The simulation results have verified that the improved cascade failure model used can better simulate the actual operating situation and provide more accurate results for system vulnerability evaluation, providing useful references and guidance for improving the effectiveness and pertinence of defense strategies.