基于相模变换的三相四线制系统故障计算方法  

Three-phase Four-wire System Fault Computing Method Based on Phase-model Transformation

作　　者：单玉凯 徐丙垠[2] 薛永端[1] SHAN Yukai;XU Bingyin;XUE Yongduan(College of New Energy,China University of Petroleum(East China),Qingdao 266580,Shandong Province,China;Smart Grid Research Institute(Shandong University of Technology),Zibo 255049,Shandong Province,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东省青岛市266580 [2]智能电网研究院(山东理工大学),山东省淄博市255049

出　　处：《电网技术》2022年第2期726-732,共7页Power System Technology

基　　金：国家自然科学基金项目(52077221)。

摘　　要：三相四线制在低压及国外中压配电网中应用广泛,其接地故障,尤其是中性线接地故障,缺少类似于“对称分量变换”那样的简化计算方法。文章提出一种四阶相模变换方法,将三相与中性线电气量变换为独立的1模、2模及仍存在耦合的0模与r模,利用受控电压源表达0模与r模间的耦合关系;根据单相接地和中性线接地的故障边界条件,构建接地故障模网图,求解得到故障电压电流等电气量。最后利用仿真验证了所提方法的正确性。The three-phase four-wire system is widely used in low-voltage and foreign medium-voltage distribution networks.However,it's grounding fault,especially the neutral line grounding fault,lacks a simplified calculation method similar to"symmetrical component transformation".This paper proposes a fourth-order phase-to-mode conversion method,which can convert the electrical quantities of the three-phase and neutral wire into independent 1 mode,2 mode,and still coupled 0 mode and r mode.And the paper expresses the coupling relationship of the 0 mode and r mode by using a controlled voltage source.According to the boundary conditions of single-phase grounding and neutral wire grounding fault,a grounding fault model network diagram is constructed,and electrical quantities such as fault voltage and current are solved.In the end,simulation is used to verify the correctness of the proposed method.

关 键 词：三相四线制 低压配电网 接地故障 相模变换 故障计算 

分 类 号：TM721[电气工程—电力系统及自动化]