Research On Cooperative Cyber-Physical Attacks In Cyber-Physical Power System

Power system provides power for social production and life,its security and stability is related to human life and social economy stability.More and more intelligent control equipment and communication equipment are introduced into power system,which improves the ability of information perception,integration,sharing and collaboration of power system,but also brings potential risks.The forms of malicious attacks on power system emerge in endlessly.Network attacks on information systems and network-physical cooperative attacks may cause blackouts.Firstly,this paper introduces the background and research methods of cyber-physical power system,cyber-attacks and cyber-physical cooperative attacks,the characteristics and research results of the system in cyber-attacks and cyber-physical cooperative attacks.And then this research introduces the principle and mechanism of cyber-physical cooperative attacks.After that,this paper proposes a hybrid integer non-linear programming model.The attacker aims to find the optimal scheme of cooperative attack,that is,the physical attack scheme that can completely cover up the system fault by injecting false data by the function of the bad data recognition in state estimation.In view of the complexity of mixed integer nonlinear model,this paper first transforms the non-linear constraints in cooperative attack model into linear constraints,and solves the problem via a branch-and-cut(B&C)algorithm,which greatly reduces the size of branch-and-bound tree.At last,the influence of cooperative attack on the system,the mechanism of cooperation between physical attack and information attack and the different cooperative attack schemes considering state estimation in cooperative attack are demonstrated by using an illustrative the IEEE14-bus,118-bus test power system.