A Comprehensive Vulnerable Line Identification Method for Distribution Network Consider-ing Cyber-physical Coupling

By identifying the key lines of the network and assessing the vulnerability of the distribution network, so as to effectively allocate security resources, the power supply reliability of the distribution network can be effectively improved. However, the definition of vulnerability assessment of the existing distribution network is relatively simple, and the high degree of interconnection between the information network and the physical network is not considered, and there is a lack of reliable indicators and methods for the identification of vulnerable lines in the cyber-physical system of the distribution network. Therefore, considering the energy supply characteristics of physical nodes to in-formation nodes, a cyber-physical system model of distribution network with distributed generators is established. In this paper, three kinds of vulnerable line identification indexes of the cyber-physical system of distribution network, namely line comprehensive degree, line comprehensive load impact vulnerability and line comprehensive fault vulnerability, are proposed. The example shows that the proposed method can consider the coupling characteristics of the cyber-physical system and the influence of distributed power generation, and can more comprehensively identify the vulnerable lines of the distribution network.