The Interdependence Ranking Method and Failure Mitigation Strategy for Cyber-Physical Power System

Abstract

This paper puts forward the Cyber-Physical Power System (CPPS) interdependence ranking method and risk mitigation strategy. The interdependences are ranked according to their integrated loads, which are the summation of the physical and cyber layer nodes weighted loads at two ends of the interdependence. The risk mitigation strategy is applied through identifying the nodes at two ends of the comparably important interdependences, and then providing backup power to the cyber nodes and connecting the physical layer nodes to the backup 3c-function support node in the cyber layer. The effectiveness of the ranking method and the risk mitigation strategy are verified through simulating sequenced interdependence attack. It shows that the interdependence ranking method is useful to identify the interdependence that is important to the robustness of the CPPS, and the risk mitigation strategy can provide effective protection to the CPPS under interdependence attack failure.