Abstract
The adoption of power cyber physical systems (Power CPS) is becoming more and more widespread, and as risk spreads, cascading failures of overload behavior can lead to the collapse of individual or entire networks, becoming a major threat to the network security. Taking the power CPS coupling node pair as the starting point, this paper establishes the comprehensive indicators characterizing the importance and vulnerability of the coupled node pair, based on the idea of intrusion tolerance, when the cyber side is faulted by the network attack, the system actively carries out reasonable and effective dynamic load redistribution based on the indicators updated after each round of cascading, thereby inhibiting the spread of risk, reducing system losses, and improving survivability. The above theory is simulated on the IEEE 30-bus system and concludes that the proposed load redistribution strategy can effectively reduce the loss of the system after attacks.