向家坝水电站扩机综合效益初步分析

摘要

For realizing efficient utilization of water resource , reduction of surplus water , improvement of downstream naviga-tion condition and more flexible operation of the power plant , the proprietor plans to install 3 Francis turbines with rated capacity of 480MW (rated water head 93m) in Xiangjiaba Hydropower Plant.On the basis of typical inflow series of different frequencies as well as daily average runoff series at Pingshan station , the additional power generation after capacity enlargement was calculat -ed, and the comprehensive benefit after the enlargement was also analyzed .The research result shows that a certain amount of ad-ditional power generation would be produced by the enlargement .Under the influence of inflow re -distribution due to the newly-built reservoirs in upper reaches , the additional power generation would decrease , however the other comprehensive benefit would be significant due to the enlargement project .%为了充分利用水能资源、减少水库弃水，以及改善枯水期下游航道的航运条件，提高水电站调度运行的灵活性，向家坝水电站计划开展扩机工程，拟安装3台单机额定出力为480 MW（额定水头为93 m）的混流式水轮发电机组。为此，将依据屏山站不同频率的典型来水和近10 a的日径流过程资料，来计算向家坝水电站扩机增容后的增发电量；并在此基础上，对该电站扩机后的综合效益进行初步分析。研究表明，向家坝水电站扩机以后将带来一定的电量增长，但是随着上游新建水库调蓄对来水的再分配影响，扩机电量将会相应减少，然而该工程带来的其他综合效益将会很显著。