考虑中性点电阻接地的交直流配电网极地故障稳态机理建模  

Steady-state analysis model of single polar ground fault of a hybrid AC/DC distribution system with resistance grounded system

作　　者：高彬 赵佳琪 王越[1] GAO Bin;ZHAO Jiaqi;WANG Yue(College of Information and Electrical Engineering,China Agriculture University,Beijing 100083)

机构地区：[1]中国农业大学信息与电气工程学院,北京100083

出　　处：《电气技术》2022年第10期18-26,共9页Electrical Engineering

基　　金：国家自然科学基金资助项目(51977210)。

摘　　要：当交直流混合配电网阀侧换流变经电阻接地时,极地故障的机理尚不明确。本文提出一种考虑阀侧换流变经电阻接地的交直流配电网极地故障稳态模型。首先根据全桥整流器的导通条件,对故障后的系统运行状态进行分析和筛选,针对每种系统运行状态,推导三相电流的多元一阶线性微分方程表达式,提出稳态条件下可能运行状态的临界切换条件,并据此建立状态轮换分段解析方法。通过Matlab/Simulink仿真分析,证明了本文所提模型和求解方法的有效性,从而为极地故障下的系统稳态分析提供理论依据。When the valve-side commutation transformer is grounded through a resistor in the AC/DC hybrid distribution network, the mechanism of the polar fault is still unclear. This paper proposes a steady-state model for the pole fault of AC/DC distribution network considering the valve-side commutation transformer grounding through resistance. Firstly, according to conduction conditions of a full-bridge inverter, the system operation state after a pole-to-ground fault is analyzed and screened. For each possible system operation state, a multivariate first-order linear differential equation system of the three-phase current is deduced. State rotation segmentation analysis method can be found through numerical simulation thereon. Through an experimental test conducted on the Matlab/Simulink, the validity of the proposed model and solving method is verified, thus providing a theoretical basis for the post-fault steady-state analysis.

关 键 词：交直流配电网 IGBT闭锁 二极管导通状态 交流线路运行状态切换 

分 类 号：TM721.3[电气工程—电力系统及自动化] TM862