Abstract: In order to scientifically evaluate the comprehensive performance of the joint operation of hydropower station and pumped storage, a multi-index comprehensive evaluation model based on the combination of analytic hierarchy process(AHP) and technique for order preference by similarity to an ideal solution(TOPSIS) is proposed. Firstly, from the five dimensions of economy, technology, environmental benefits, water conditions and policies, a comprehensive evaluation system of 11 indicators, including power generation efficiency, peak regulation capacity, carbon emission intensity, and changes in the amount of incoming water is constructed. Secondly, AHP is used to determine the weights of each index to reflect the differential influence of different dimensions, and the closeness of each operation scheme to the ideal solution is calculated through TOPSIS to realize the ranking of the advantages and disadvantages of the joint operation mode. Finally, the joint project of hydropower station and pumped storage in a certain region is taken as an example for verification and analysis. The results show that, compared with the traditional single evaluation method, the AHP-TOPSIS model can effectively take into account the subjective and objective factors, and quantify the evaluation results, among which the peak regulation capacity and dynamic payback period have a significant impact on the comprehensive performance. At the same time, the collaborative optimization of energy storage capacity allocation and scheduling strategy in the joint operation scheme can improve the comprehensive benefit of the system by more than 15%. The study results provide a theoretical basis for the scheme optimization and decision-making of hydropower-pumped storage joint operation in multi-energy complementary systems, and have practical significance for promoting the efficient utilization of clean energy.

Key words: hydropower station, pumped storage, AHP-TOPSIS, comprehensive evaluation, joint operation