考虑参数不对称的配电网单相接地故障柔性消弧方法  

A flexible arc suppression method for a single-phase grounding fault in a distribution network considering parameter asymmetry

作　　者：丁敬明 邹贵彬[1] 周成瀚 温旭辉 杨晶晶[2] 栾国军[2] DING Jingming;ZOU Guibin;ZHOU Chenghan;WEN Xuhui;YANG Jingjing;LUAN Guojun(Shandong University,Jinan 250061,China;State Grid Weifang Power Supply Company,Weifang 261021,China)

机构地区：[1]山东大学,山东济南250061 [2]国网潍坊供电公司,山东潍坊261021

出　　处：《电力系统保护与控制》2023年第12期58-67,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52077124);国网山东省电力公司科技项目资助(2021A-019)。

摘　　要：为了解决配电网参数不对称导致的中性点位移过电压以及消弧不彻底的问题,在配电网正常运行时利用闭环控制对中性点电压进行调控,自动跟踪配电网结构参数的变化,实现不平衡电压的快速精准抑制。设计注入电流反馈控制环节,结合不平衡电压调控过程以及故障后的零序电流和零序电压,仅注入一次电流便可实现故障辨识、故障选相并求得故障可靠消弧所需的注入电流参考值。仿真分析验证了闭环控制能够有效跟踪、抑制中性点不平衡电压,所提柔性消弧方法在系统参数不对称的情况下,故障判别精度高,故障消弧效果良好。To solve the problems of neutral point displacement overvoltage and incomplete arc suppression caused by distribution network parameter asymmetry,closed-loop control is used to regulate the neutral point voltage during the normal operation of the distribution network.It automatically tracks the changes of the distribution network structure parameters,and realizes rapid and accurate suppression of the unbalanced voltage.An injection current feedback control link is designed.It is combined with the unbalanced voltage regulation process and the zero-sequence current and zero-sequence voltage after the fault.Then fault identification,fault phase selection and the reference value of the injection current required for reliable arc suppression can be achieved by injecting only one current.The simulation analysis shows that the closed-loop control can effectively track and suppress the unbalanced voltage of the neutral point.The proposed flexible arc suppression method has high fault discrimination accuracy and good fault arc suppression when there are asymmetric system parameters.

关 键 词：参数不对称 闭环控制 故障判别 故障选相 柔性消弧方法 

分 类 号：TM862[电气工程—高电压与绝缘技术]