基于双解耦的配电网三相不平衡快速潮流算法

Three-phase unbalanced fast power flow calculation algorithm based on double decoupling for distribution network

为实现三相配电网潮流的高效计算,同时兼顾对分布式电源、线路参数不对称、高R/X比值和弱环网的适应性,提出一种相间解耦与复数域快速分解算法相结合的主动配电网双解耦三相快速潮流算法。首先采用相间解耦补偿模型对配电线路三相直接进行相间解耦;然后利用复数域标幺化技术减小各相的R/X比值的影响,继而引入快速分解潮流算法进行相内分解运算。该方法中的两步解耦减小了雅可比矩阵维数并且使其在计算过程中保持不变,极大地简化了计算复杂性。该算法对分布式电源和弱环网也有较强的适应性。算例测试结果验证了所提算法的有效性。

In order to realize the efficient calculation of three-phase power flow of distribution network and consider the adaptability of distribution generation,unbalanced line parameters,high ratio of R/X and weak looped network,a double decoupling three-phase fast power flow algorithm is proposed by the combination of interphase decoupling and fast decomposition method in complex field. The interphase decoupling compensation model is adopted for the direct three-phase interphase decoupling of distribution transmission line,the complex per unit normalization is used to reduce the impact of R/X ratio in each phase,and then the fast decomposition power flow algorithm is introduced for decomposition. Double decoupling in the proposed method reduces the dimension of Jacobian matrix and keeps it constant in the calculation process,which significantly simplifies the complexity of calculation. The proposed method also has a better adaptability of distributed generation and weak looped network. The testing results verify the effectiveness of the proposed algorithm.