大型水电站主要特征值的无尺度统计分析

Nondimensional statistic analysis of main features of large hydropower plants

本文对大型水电站的5项主要特征值——多年平均流量Q(m^3/s)、水库有效库容V(10~3m^3)、水轮机组设计水头H(m)、电站装机容量N(MW)、平均年发电量E(10~6MW·h),建议应用5个无尺度数——库容系数α、流量-水头比ω、装机系数β、运行系数τ、电能系数ε,进行无尺度统计分析,使位置分散、特征值大小悬殊的许多水电站,得以进行综合性归纳比较,同时对特征值之间的关系进一步加深认识,文中对国内外装机容量超过1000MW的已建大型坝库式水电站的特征值进行无尺度数计算,见表1;无尺度分析的成果列于表2.由表2归纳所得的7点认识,可供大型水电站规划及可行性研究参考,本文所建议的无尺度统计分析方法,对于装机容量在1000MW以下的大、中型坝库式水电站以及引水式水电站也可应用。

This paper suggests to use five nondimensional numbers in the stati-stie analysis of main features of hydropower plants. The five nondimen-sional numbers are. coefficient of active storage α, dimensionless ratio of discharge and design head ω, coefficient of installed capacity β, coefficient of mean annual operation hours τ and coefficient of mean annual output ε.The five main features of 20 large hydropower plants with installed capacity over 1000MW are analysed accordingly. Some findings resulted from the nondimensional statistic analysis will be beneficial to the planning and feasibility studying of various types of hydropower plants.