Multi-Dimensional Gray Relational Comprehensive Evaluation of an AC/DC Hybrid Grid Operation Mode Based on the DEMATEL-CRITIC Method

To evaluate the operation modes of AC/DC hybrid power grids, a comprehensive evaluation index system is established based on the principles of index system construction, with a focus on mode development personnel in practical engineering. This system includes four aspects: static security, transient stability, DC security, and economic performance of the operation mode, with detailed explanations of the statistical or computational methods for each index. This index system can objectively and comprehensively reflect the rationality of the operation mode. Then, the Decision-making Trial and Evaluation Laboratory—Criteria Importance Through Intercriteria Correlation (DEMATEL-CRITIC) method is used for combining subjective and objective weights. Considering the scheduling decisions of power grid operators, the method is used to analyze the relationships among indexes, as well as their conflicts and variations. Gray relational analysis is used as the evaluation method to form a comprehensive evaluation model for the operation modes, achieving a scientific and effective comprehensive assessment of AC/DC hybrid power grids. Finally, a case study of an AC/DC hybrid power grid is used to validate the index system and the evaluation model. A comparative analysis demonstrates the effectiveness of the evaluation method and provides a practical tool for the planning, modification, and safe operational management of grids.