As the largest hydropower, project under construction in the world, the three Gorges hydropower station on Yangtze features water head variation in large range, low head operation during flood season and high head operation during long dry season. The parameter selection for the turbine-generator units of the project shall satisfy not only the requirement of generating more electricity in low head situation, but also the assurance of stable operation in high head situation. This paper describes how to select design head of the turbine and increase generator capacity properly so as to improve operation stability as well as analyses the structure of the turbine-generator units and cooling scheme of the generator.
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