三峡工程水轮发电机组若干技术问题

长江三峡水电站是世界上在建的最大水电站。电站水头变幅大，汛期低水头运行，枯期高水头运行持续时间长。三峡要组的参数选择除应满足低水头时多发需要外，还应保证水轮机在高水头时稳定运行，为此对如何合理地确定水轮机设计水头和适当增大发电机容量以改善运行稳定性问题进行论述，并对机组结构型式和发电机冷却方式也作了分析研究。

Several technical problems of hydrogenerator unit of the Three Gorges Project

The Three Gorges Project in the Yangtze River is the largest under-construction hydropower station in the world. The water head of the station has a large varying range, that is, the station would operate in low water head during flood season but in high water head during dry season for a long period. Besides it should meet the needs of more power generation during low water head period,the selection of the generating unit parameters in the Three Gorges Project should guarantee the water turbine to be steadily operated during the high water head period. This paper describes how to rationally determine the design water head of turbine and properly increase the generator capacity in order to improve the operation stability, and analyzes the generator unit structural type and generator cooling way.