关键词: 多能互补;水轮机;效率;加权因子;经济运行;

Abstract: In recent years, hydropower has been increasingly burdened with regulating wind and solar power in a compensation way, and the wide load operation of hydropower units has become a new normal.To explore the variation of efficiency and its influencing factors of hydropower units under wide-load operation, the weighted factor method for analyzing turbine efficiency is applied and refined.The efficiency distribution of turbine in corresponding interval before and after the wide load upgrade of Unit 3 of Lijiaxia Hydropower Station is studied, and the variation of weighted average efficiency of the turbine is analyzed, especially the specific influence of operating conditions on weighted efficiency is analyzed.The results show that the weighted average efficiency is improved by 3.61%.The Unit 3 mainly operates in three output intervals, and the output interval moves upward to higher output after the upgrade, showing a more concentrated features, which does not fully play its potential to wide-load operation, indicating that there is still a room for unit efficiency improvement.The specific analysis methods and conclusions are presented, and the deficiencies of the existing operation are pointed out, which can provide method and technical references for the economic operation of hydropower station under the background of multi-energy complementarity.

Key words: multi-energy complementarity; hydraulic turbine; efficiency; weighted factor; economic operation;