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小型水电站装机容量选择的计算方法,一般来说,有电力电量平衡法和装机年利用小时数法、保证出力倍比法、最优水流总利用率法等简化法。电力电量平衡法一般在初步设计阶段采用。在独立小电网的骨干电站,根据电网的负荷和网内电源的结构,确定拟建电站的工作位置来选择装机容量,是比较准确合理的。但在规划阶段或非骨干电站和资料不足的电站（包括直接联大电网的）可以采用各种简化的计算方法。
Small hydropower station installed capacity of the choice of calculation methods, in general, there are power balance method and installation of hours using hours method to ensure that the output ratio method, the optimal method of total water flow and other simplified method. Power balance method is generally used in the preliminary design stage. In the independent small power grid backbone power station, according to the grid load and the structure of the network power to determine the proposed power station work location to select installed capacity, is more accurate and reasonable. However, a variety of simplified methods of calculation may be used during the planning phase or at non-backbone and insufficiently-available power stations, including directly connected power grids.