Resilience Assessment for Hybrid AC/DC Cyber-Physical Power Systems Under Cascading Failures

This article presents a resilience assessment approach for hybrid ac/dc cyber-physical power system (CPPS), proposing a comprehensive assessment index called cascading failure recovery index (CFRI) that simultaneously considers the system scale and load level in the cascading failure recovery process. First, correlation characteristic matrix-based modeling framework is developed to capture the characteristics of multidimensional heterogeneous power systems, providing a clear description of the cyber-physical coupling network. Besides, the proposed CFRI incorporates cyber-physical coordinated attacks to assess the robustness of hybrid ac/dc power systems under different attack scenarios. The CFRI takes into account the number of nodes, branches, and load levels, enabling an accurate assessment of the disconnection degree and recovery capability of CPPS in case of cascading failures. Finally, simulation studies are conducted on a IEEE 39-bus power system modified with dc transmission lines to validate the effectiveness of the proposed method.