Resilience Assessment and Improvement for Cyber-Physical Power Systems under Typhoon Disasters

The cyber physical deep coupling makes power systems face more risks under small probability and high risk typhoon disasters. Resilience describes the ability of cyber physical power system (CPPS) withstanding extreme disasters and re sum ing normal operation. To improve the resilience assessment and analysis method of CPPS, first, a CPPS resilience assessment framework that considers the space time metrics of disasters and the interactions of information systems and power grids is proposed, including fault scenarios extraction, response and recovery analysis, quantitative assessment of resilience. Second, f rom the perspective of the geographical coupling between OPGW and transmission lines and the control coupling between automatic generati on control system (AGC), substation automation system (SAS) and power system, the interaction of information flow and energy flow during the failure period is analyzed. The network flow theory is used to establish an information network traffic model to de scribe the operating status of the information system at each stage. On this basis, a mixed integer linear programming model for DC optimal power flow considering the information network constraints and a multi stage bi level model for cyber physical colla borative recovery are established. Finally, we take the IEEERTS 79 system as an example to show that the proposed method can improve the quantization accuracy comparing with the assessment method of the conventional power system, and evaluate the enhanceme nt of typical measures at different stages.