Study on the gain mechanism of joint power-generation operation of cascade reservoirs system between downstream Jinsha River and Three Gorges-Gezhou Dam
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Abstract:
Located at the lower reaches of Jinsha River and middle reaches of Yangtze River, the cascadereservoirs system of Xi luodu, Xiangjia Dam, Three Gorges, and Gezhou Dam is an important hydrologic project in the Yangtze river basin. Joint operation of the reservoirs system has significant benefits. In this study , we established two optimized operation models for independent and joint power generation of the reservoirs system. Long inflow time series were used to calculate the gain of power generation benefit and to analyze the distribution of the gain in time, year type, and space. Moreover, we quantified the contribution percentages of released water and water head to the gain using the total differential equation. The results showed that: (1) the gain during the drawdown season mainly occurred in May, and was mostly in Gezhou Dam and Xiangjia Dam. (2) The gain was generated because Xiluodu and Three Gorges evened the water release process in May and June and reduced the discarded water volume of Xiangjia Dam and Gezhou Dam, thus increasing the water head of these two reservoirs. (3) The released water and water head contributed nearly equally to the gain generated in Xiangjia Dam. The main contribution factor to the gain in Gezhou Dam was water head. The variation of the gain generated in Xiluodu and Three Gorges was mainly influenced by the variation of water head during the joint operation.
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