Abstract: Among large and medium-sized hydropower stations in China, some of the older hydropower units that have been in operation for a long time have experienced a decline in performance and an increase in failure rates. It is of significance to take necessary technical measures to increase the capacity of the old units. Therefore, investigations and studies on the issue of hydropower unit capacity upgrading and renovation are carried out. Based on the survey, the existing problems and difficulties in the current implementation of hydropower unit capacity upgrading and renovation are analyzed and summarized, and suggestions are given for reference.

Key words: hydropower station, capacity upgrading and renovation, increase unit, characteristic, measure and suggestion

摘要： 我国已建成大中型水电站中，部分运行年限较长的老旧机组性能下降、故障率上升，采取必要的技术措施对老旧机组实施增容改造具有重要意义。通过多种方式对大中型水电站机组增容改造问题开展专项调查研究，总结当前实施机组增容改造和扩机存在的问题及难点，结合拟采取的增容改造和扩机措施，对当前实施机组增容改造和扩机提出下一步工作建议。

关键词: 水电站, 增容改造, 扩机, 特征, 对策建议