含多类型直流的交直流混联电网潮流计算方法适用性分析

作为电网发展的新阶段，交直流混联电网呈现多类型直流参与、大规模交直流互联的特点，而关于统一迭代和交替迭代2种潮流计算方法的适用性尚未得到深入分析。为此基于含多类型直流的交直流混联电网对2种潮流计算方法的运算性能进行对比研究。推导了含常规直流、柔性直流、混合直流的交直流混联电网潮流模型，进而提出了相应的统一迭代法和交替迭代法。通过3个交直流混联电网测试系统和南方电网实际系统数据验证了潮流模型的有效性和潮流算法的准确性，结合系统负荷水平、系统强度、直流嵌入规模等因素对2种潮流计算方法的收敛性能和计算速度进行对比分析。研究结果表明，在含多类型直流的交直流混联电网中进行潮流计算时，统一迭代法的计算效率比交替迭代法高。

Applicability analysis of power flow calculation methods for AC/DC hybrid connected power grid with multi-type DC

As a new stage in the development of power grid, the AC/DC hybrid connected power grid is characterized by multi-type DC participation and large-scale AC/DC interconnection. However, the applicability of the unified iteration and alternating iteration algorithms for power flow calculation has not been deeply analyzed. Therefore, based on an AC/DC hybrid connected power grid with multi-type DC, the calculation performance of the two algorithms is compared and studied. The power flow model of the AC/DC hybrid connected power grid with conventional DC, flexible DC, and hybrid DC is derived, and correspon-ding unified iteration and alternating iteration algorithms are proposed. The effectiveness of the power flow model and the accuracy of power flow algorithms are verified by the data of three AC/DC hybrid connected power grid test systems and the actual system of China Southern Power Grid. The convergence performance and calculation speed of the two algorithms are compared and analyzed in combination with the factors such as system load level, system strength, and DC embedding scale. The research results show that during the calculative progress of large-scale AC/DC hybrid connected power grid with multi-type DC, the unified iteration algorithm has higher computational efficiency than that of the alternating iteration algorithm.