In order to solve the problem that the most linear power flow calculation methods can not deal with PV nodes, a linear power flow calculation method for distribution networks is proposed. Focused on the nodal power equations of polar coordinates' Newton-Raphson power flow calculation, the proposed method uses linear approximation to handle the nonlinear terms in the nodal power equations according to the characteristics of distribution networks, and brings up a kind of linear power flow equation. The proposed method not only applies to weakly meshed networks, but also overcomes the defects that the most linear power flow calculation methods can not deal with PV nodes. The results of Newton-Raphson power flow calculation method is taken as a criterion, and the analysis of examples show that the magnitude of the maximum error of the proposed method is maintained at 10-4. Computational accuracy and computational efficiency all meet the engineering demand of rapid analysis of distribution system.%为了解决线性潮流计算方法无法处理PV节点的问题, 提出了一种含PV节点的配电网线性潮流计算方法.所提方法从极坐标的牛顿-拉夫逊法潮流计算的节点功率方程出发, 利用配电网的特征对节点功率方程中的非线性项进行线性近似处理, 得出一种线性潮流方程.所提方法不仅适用于弱环网络, 还克服了大多数线性潮流计算方法无法处理PV节点的缺陷.算例分析表明, 以牛顿-拉夫逊法潮流计算结果作为基准, 所提方法的最大误差的数量级保持在10-4, 计算精度与计算效率满足配电系统快速分析的要求.
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