Research On Fault Handling Simulation Of Distribution Network CPS Considering Information Network Security Risk

With the development of intelligent distribution network,a large number of sensor systems,computing units,control systems and communication systems are gradually integrated with the distribution physical network,forming a distribution network cyber physical system(CPS)with the characteristics of typical cyber physical system.In view of the current situation that the distribution network information and physical modeling principle are separated,it is urgent to carry out the unified modeling research of distribution network CPS to realize the analysis of the overall system operation state.The information system of distribution network CPS is faced with complex network security problems.The influence of information network security events on distribution network CPS can not be ignored.In order to realize the unified simulation of distribution network cyber system and physical system,and analyze the impact of information network security risk on distribution network fault processing process,it is urgent to develop a distribution network CPS simulation technology,which can reflect the influence of communication system into the distribution network operation simulation,and accurately simulate the distribution network CPS fault processing process.Based on the relevant theoretical knowledge and methods,this paper studies the fault processing simulation of distribution network CPS under the influence of information network security events.The main contents of this paper are as follows:(1)Fault processing method and simulation platform foundation of distribution network CPS.This chapter analyzes the fault processing process of distribution network CPS,summarizes the advantages different from other fault handling methods;from the perspective of simulation,analyzes the three levels of distribution network CPS physical layer,communication layer and information control layer,and selects the corresponding simulation tools respectively;finally,based on the selected simulation software,the simulation models of physical layer,communication layer and information control layer of distribution network CPS are established.(2)Information network security risk analysis of distribution network CPS.Firstly,the communication mode,typical communication network structure and master station system of distribution network CPS information network are analyzed,and the weak links of distribution network CPS information network security and the source of information network security risk are summarized;then,the DDoS attack and man in the middle attack in the distribution network CPS information network and the impact of the two attacks on the information network and physical network are studied.Finally,the security risks and consequences of information attacks are analyzed.(3)Fault processing method of distribution network CPS considering information security risk.Firstly,a CPS fault processing method based on matrix operation is studied.Then,by fully considering the influence of information network security,the identification method of information network attack events and fault-tolerant CPS fault processing method of distribution network are proposed from the perspective of simulation.Finally,we verify the effectiveness of the algorithm through simulation.(4)Fault processing simulation of distribution network CPS based on simulation platform.Firstly,on the basis of the selected three-level simulation software,the joint simulation platform of distribution network CPS is built by solving the problem of data interaction between levels.Then,the simulation methods of DDoS attack and man in the middle attack on the platform are studied.Finally,the fault processing simulation of distribution network CPS under normal communication condition,DDoS attack and man in the middle attack is carried out.