Research on Modeling and Simulation of CPPS and Its Cascading Failure Mechanism

With the rapid development of smart grid, the integration of information network and power physical network has reached a new level. The traditional power system has gradually developed into a highly interconnected cyber-physical power system with information domain and physical domain. However, due to the gradual integration of cyber-physical networks, when the system fails or is attacked, it will interact and spread across domains between the information domain monitoring system and the physical domain power grid system, which brings more security problems to the smart grid. In this paper, the improved power flow model and complex network model are integrated to establish a two-layer cyber-physical power network model. On this basis, the key issues that need to be solved in the modeling and simulation of the cyber-physical power coupling network are analyzed and solved, that is, the reasonable simplification of simulation model and the design of efficient coordination mechanism. Taking IEEE39 node as an example, the paper analyzes the impact of different attack methods on cyber-physical power system through simulation experiments, finds out the key nodes of the system, and obtains the propagation mechanism of cascading failure. Our work points out the direction for the defense and reinforcement of cyber-physical power system.