尾水重叠变化条件下水电站装机容量选择

董箐水电站的下游与龙滩水库衔接，呈现远景尾水重叠变化的特点。通过分析董箐水电站近远期水头特性、上游光照水库对董箐水电站入库径流的影响、河段综合利用要求、供电范围内负荷特性、电源结构及电力市场需求等，采取近期和远景结合的思路，以梯级发电引用流量匹配为原则，通过多方案技术经济比较，选择董箐水电站装机容量为880 MW。

Selection of installed capacity for hydropower station under condition of overlapped change of tail-water

As the downstream of Dongqing Hydropower Station links up with Longtan Reservoir, a feature of an overlapped change of the tail-water in the future is presented. Through the analysis on the recent and future characteristics of the water head, the impact from the upstream Guangzhao Reservoir on the inflow runoff to Dongqing Hydropower Station, the requirement on the comprehensive utilization of the river reach, the loading characteristics within the power supply range, the structure of power supply, demand of power market, etc., the concept of the combination of both the recent and the future is adopted, and then the installed capacity of 880 MW is selected for Dongqing Hydropower Station by taking the matching of the diversion water rate for the cascade power generation as the principle through the technical and economic comparison made among several schemes concerned.