绩溪抽水蓄能电站下水库洪水调节分析

Flood Regulation Analysis of Lower Reservoir of Jixi Pumped-Storage Power Station

摘要: 抽水蓄能电站机组发电流量相对下水库入库洪水较大，下水库的洪水调节需考虑入库洪水与发电流量的叠加影响。绩溪抽水蓄能电站下水库库容条件好，消落深度小，而水库下游河道的防洪能力弱，下水库泄洪设施规模设计综合考虑系统发电要求、枢纽建筑物的经济性，兼顾下游防洪安全，在坝高增加不多的情况下，选择较小规模的泄洪设施规模，达到为下游削减洪峰的作用；其设置逐步关机方案可将因防洪造成的影响停机时长控制在0.5 h以内。

Abstract: For a pumped storage power station, the flood regulation of lower reservoir should take the superimposition of inflow flood and generating flow into consideration, since the generating flow is usually larger than the inflow flood. The lower reservoir of Jixi pumped storage power station has a good condition of storage capacity with small hydro-fluctuation depth, while the flood control ability of downstream river is weak. The system generation requirements, the cost of hydraulic complex buildings and the downstream flood control security are supposed to be considered to design the scale of the flood control facilities in the lower reservoir. If the increase of the dam height is limited, a small scale of flood control facilities should be designed to reduce the downstream flood peak. In addition, the shutdown time of units can be controlled within 0.5 h by the step-by-step shutdown scheme.