Study on cross-space risk interaction mechanism in CPS system under network attack

Power Information-Physical Systems are at risk of cyberattacks. Based on the interaction mechanism of power information-physical fusion system across space risks under network attack, this paper first analyzes the operational characteristics of power information-physical fusion system, and studies the operating characteristics and structural characteristics of the system before the attack occurs. Secondly, the topological model of power information-physical fusion system is established, and the influence of CPS system structure vulnerability on the spread of network attack security risk is analyzed from the characteristics of power grid topology, and a method of quantifying vulnerability nodes in network is established. At the same time, considering the evolution process of risk in the cross-space environment, combined with the operational characteristics of information-physical fusion system, this paper deeply studies the process of interactive transmission of power grid information-physical system security risk under cyber attack, and analyzes the alternating propagation process of information side risk penetrating physical boundary to trigger physical side risk and lead to further expansion of risk. Finally, the simulation analysis is carried out through the IEEE-57 node test system.