Safety Assessment Method for PV-ES-DC-Flexible V2G Emergency Power Supply Based on the Fuzzy Evaluation Method

To enhance the safety and reliability of the Vehicle-to-Grid emergency power supply system in disaster and fault scenarios, this paper proposes a comprehensive safety assessment method based on the fuzzy evaluation method. Firstly, a three-level assessment system is constructed, and a five-level evaluation set is divided. For weight calculation, a strategy integrating subjective and objective weights is designed by combining the Analytic Hierarchy Process and the Entropy-CRITIC method. For indicator assignment, a comprehensive approach is adopted, including the expert assignment method, TOPSIS method, and Sigmoid function combined with national standards for assignment. Finally, by designing membership functions, a comprehensive fuzzy evaluation model is built to calculate the safety level of the system. The effectiveness of this assessment method is verified through experiments, which can provide a scientific basis for the safety optimization of the V2G emergency power supply system.