计及分布式电源下垂控制和负荷静态特性的三相不平衡孤岛微电网直接潮流算法

基于分布式电源下垂控制、负荷静态特性和三相不平衡网络模型，提出了一种三相不平衡孤岛微电网的直接潮流算法。首先基于配电网直接潮流算法，并计及分布式电源下垂控制和负荷静态特性的影响，推导建立了三相不平衡孤岛微电网直接潮流算法的计算模型。为了求解所提直接潮流算法的计算模型，提出了一种两层潮流迭代法，其中内层潮流迭代法用于求解除虚拟节点外的三相不平衡孤岛微电网的潮流计算，外层潮流迭代法用于更新虚拟节点电压和系统角频率。最后分别基于澳大利亚真实网络和25节点典型微电网开展多场景仿真分析，并将其与牛顿信赖域方法进行对比分析，仿真及对比结果表明所提算法能够快速准确地反映微电网的特点以及真实运行状态，并能够解决三相不平衡孤岛微电网的潮流计算问题。

Direct power flow algorithm for three-phase unbalanced island microgrid considering distributed power generation droop control and load static characteristics

Based on DG(Distributed power Generation) droop control, load static characteristics and three-phase unbalanced network model, a direct power flow algorithm for three-phase unbalanced island microgrid is proposed. Firstly, based on the direct power flow algorithm of distribution network, considering the influence of DG droop control and load static characteristics, a calculation model of direct power flow algorithm for three-phase unbalanced island microgrid is derived. In order to solve the calculation model of the proposed direct power flow algorithm, a two-layer power flow iteration method is proposed. The inner power flow iteration method is used to solve the power flow calculation of the three-phase unbalanced island microgrid beside the virtual node, and the outer power flow iteration method is used to update the voltage and system angular frequency of the virtual node. Finally, multi scenario simulation analysis is carried out based on Australian real network and 25-bus typical microgrid respectively, and compared with Newton trust region method. The simulative and comparison results show that the proposed algorithm can quickly and accurately reflect the characteristics and real operation state of microgrid, and can solve the power flow calculation problem of three-phase unbalanced island microgrid.