基于支路等值注入功率模型的外部网络等值修正方法

A corrected external equivalent approach using branch equivalent injection power model

在基于外部网络等值的最优潮流计算中,不断对外部网络等值导纳矩阵进行重新计算导致计算效率下降。针对Ward等值和REI等值,通过采用支路等值注入功率模型消去变动支路对节点导纳矩阵的影响,获得与变动支路无关的外部等值导纳矩阵,只需修正变动支路的等值注入功率,并把支路注入功率归并到边界点,即可对外部网络等值进行修正。以IEEE39节点系统作为试验系统,通过对外部网络等值修正效果进行评估,验证了所提方法的正确性和有效性。

During optimal power flow computing based on external network equivalent,t he equivalent admittance matrices of external networks need to be recalculated repeatedly and hence computational efficiency is reduced.According to Ward equivalent and REI equivalent,this paper presents the method which replaces the changed branches by means of branch equivalent injection power model to eliminate the influence of changed branches on bus admittance matrices and gain the equivalent admittance matrices which are not associated with changes of branches.The correction of external network equivalent is implemented only through modifying branch equivalent injection power and merging equivalent injection power into boundary buses.F urthermore,r esults on IEEE 39-bus systems validate the correctness and effectiveness of the proposed method.