含分布式电源的三相不平衡配电网潮流计算

根据配电网三相不平衡的实际情况，为准确计算各种分布式电源(distributed generation，DG)并入配电网后的潮流问题，文章基于前推回代法，提出了可处理PV和PQ节点模型DG的三相不平衡潮流算法。按照配电网拓扑结构，利用支路分层技术，加快了潮流计算速度。在处理PV节点模型DG时，将电压正序分量幅值作为电压调节参数，计算电压正序分量幅值和额定电压幅值差，得到PV节点的无功补偿量，将DG由PV节点运行模型转换为PQ节点运行模型。IEEE 34节点系统算例结果验证了该算法的正确性。最后，通过分析DG对电压的调节和无功补偿能力，研究了不同类型DG对配电网电压的影响。

Calculation of Three-Phase Unbalanced Power Flow in Distribution Network Containing Distributed Generation

According to actual conditions of three-phase unbalance in distribution network, to accurately calculate the power flow of distribution network connected with various distributed generations (DG) a three-phase unbalanced power flow algorithm based on forward and backward substitutions, that can cope with DG modeled as PV or PQ nodes, is proposed. In accordance with topological structure of distribution network and by use of laterals delaminating technology the calculation of power flow is speeded up. During the coping with DG modeled as a PV node, taking the amplitude of positive sequence voltage as voltage regulating parameter the amplitude difference between positive sequence voltage and rated voltage is calculated, then the amount of reactive power compensation for PV node is obtained and then the DG represented by PV node operation model is changed into that represented by PQ node operation model. The correctness of the proposed algorithm is verified by the calculation results of IEEE 34-bus test system. Finally, by means of analyzing the ability of voltage regulation and reactive power compensation of DG, the impacts of various types of DGs on distribution network voltage are researched.