中文摘要：

该文给出基于注入电流的牛顿–拉夫逊潮流计算方法和算例分析。叙述各端点元件的潮流方程的构建方法,详述三相分布式电源6个控制方程与节点注入电流不平衡量方程的结合方法,同时推导雅可比矩阵元素的计算公式。在Matlab平台编制计算程序,采用多个IEEE测试系统对所提模型和算法进行验证。与现有文献及多个商业软件比较计算精度,并分析低压配电网络中接地阻抗对中性点电压和中性线电流的影响。在IEEE 37节点的三相三线制系统基础上构建一个包含三相三线制中压配电网和三相四线制低压配电网及多个类型分布式电源的混合中低压配电系统,运用所构建的混合中低压配电系统进一步验证所提出的方法,并分析配电变压器零序励磁阻抗对系统不平衡度的影响。

英文摘要：

Newton-rapshon power flow calculation method based on the current injection and example analysis were given. The construction method of the power flow equation of endpoint components was described, and the method for combining the six control equations of three-phase DG with the imbalance equations of node injection current was detailed. At the same time, the formula for calculating the element of Jacobi matrix was also derived. Multiple IEEE sample systems were used to verify the proposed model and algorithm in the Matlab platform. The calculation precision of the proposed method was compared with the one reported in the existing literature and commercial software, and the influence of grounding impedance of low-voltage distribution network on neutral point voltage and the neutral line current was also analyzed. Based on IEEE37 sample system, a hybrid medium-low voltage distribution system, which contains three-phase three-wire system medium-voltage distribution network, three-phase four-wire low-voltage distribution networks and various types DG, was constructed. The constructed hybrid medium-low distribution system was applied to further test the proposed method, and the influence of the transformer zero sequence excitation impedance on system unbalance was also investigated.