Node Coupling Degree Based Defense Strategy Against Continuous Cyber Attack on Power Grid

Power grid cyber attack is a new type of attack with the help of computer and information technology. The cyber attack targets the power grid cyber network and causes the failure of cyber nodes. Due to the coupling of the cyber-physical system(CPS), the fault generated by the faulty cyber node will spread to the physical network and cause damage. However, most of the current defense strategies are based on physical network characteristics without considering the cyber-physical interaction. In this paper, we first establish a power communication coupling network model and a continuous cyber attack model based on the power grid topology that conforms to the structural characteristics of the actual power CPS. Then, the definition of power CPS node coupling degree and the defense strategy based on node coupling degree are proposed. Finally, experiments based on the IEEE-118 nodes model are done to verify the effectiveness of the defense strategy proposed in this paper.