基于改进渗流理论的信息物理融合电力系统连锁故障模型

基于改进渗流理论,提出了考虑物理层电网潮流分析与信息层延时的信息物理融合电力系统连锁故障模型。将连锁故障的动态发展描述为故障在信息层、物理层交替传播扩大的多阶段过程,在分析故障在物理层传播的阶段中考虑物理层电网潮流,在脆弱度指标中综合拓扑完整度、信息层延时增量及物理层实际运行指标。对信息层、物理层不同对应依靠策略及节点攻击策略的连锁故障建模仿真表明拓扑中心度对应依靠策略呈现较低的脆弱度;物理层分区设立分布式控制中心与集中式控制中心的结构相比,能提高连锁故障发展中信息层的运行实时性。同时,节点蓄意攻击相比于随机攻击能造成发展更迅速,影响范围更广的连锁故障。

Model Cascading Failures in Cyber Physical Power System Based on Improved Percolation Theory

This paper presents a model of the cyber physical power system(CPPS)cascading failures based on the improved percolation theory. In this model, the dynamic developing process of cascading failures in CPPS is divided into several stages. The physical layer power grid AC power flow analysis is incorporated in the stage corresponding to the failure propagating in the physical layer. The vulnerable indices include both topological integration, the increment of cyber layer delay and physical layer operation status. Simulations of cascading failures in the CPPS with various interdependence interface and node attack strategies show that the topological centrality interface strategy exhibits better robustness, compared with the centralized control center, the distributed control center strategy in the physical layer can improve the time-delay situation in the cyber layer during the cascading failures. Meanwhile, the topological centrality based node deliberate attack strategy can cause more rapidly developing cascading failures and heavier damages to the CPPS. This work is supported by National Natural Science Foundation of China(No.51537010)and National Basic Research Program of China(973 Program)(No. 2013CB228206).