金沙江下游与三峡梯级水库群协同消落方式研究

梯级水库群消落期协同运行方式是梯级水库群联合调度重要环节。以溪洛渡、向家坝、三峡与葛洲坝梯级水库群为背景,将消落期来水分成丰水年组、平水年组和枯水年组,以分组期望发电量最大为目标,建立了消落期随机联合优化调度模型,结合各库不同消落期初水位开展了模拟计算,得到不同水文年型下梯级水库群的期望协同消落方案。结果表明:金沙江下游与三峡梯级水库群协同消落方式能在一定程度上提高梯级期望总发电量;当来水较少且三峡消落期初水位较低时,金沙江下游与三峡梯级水库群协同消落方式可显著提高三峡和葛洲坝水库的供水效益。最后,总结归纳了不同情境下溪洛渡-三峡协同消落策略,以指导金沙江下游与三峡梯级水库群消落期实际运行。

Synergetic method of dry season operation in downstream Jinsha River and Three Gorges cascade reservoirs

The synergetic method of dry season operation of cascade reservoirs is an important part of the joint operation of cascade reservoirs. A research was carried out in the background of the cascade reservoirs including Xiluodu, Xiangjiaba, Three Gorges and Gezhouba. The runoff in dry season was separated into three groups including high hydrological years, normal hydrological years and low hydrological years. A stochastic optimal dispatching model for cascaded reservoirs in dry season was established taking the maximum mathematical expectation of generated energy in each group as the object. A calculation was carried out considering the different water levels at the beginning of dry season and the synergetic schemes of different hydrological years were obtained. The result showed that the synergetic method of dry season operation in Three Gorges cascade reservoirs coulf increase overall generated energy in some degree. The water supply benefit was great under the condition that the inflow was low and the beginning water level of Three Gorges was low. At last, the synergetic strategy of dry season operation of Xiluodu- Three Gorges cascade reservoirs was summed up to guide the practical operation of the downstream Jinsha River and Three Gorges cascade reservoirs.