基于参数拟合的单相接地电弧研究  

Single-Phase Grounding Arc Based on Parameter Fitting

作　　者：肖梓林[1] XIAO Zilin(China Railway First Survey And Design Institute Group Co.,Ltd.,Xi'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《电瓷避雷器》2021年第2期190-197,共8页Insulators and Surge Arresters

基　　金：中国铁建股份有限公司(副部级单位)科技研究开发计划课题“城市轨道交通再生能量利用研究”(编号:13-C49)。

摘　　要：配电网中故障频发,其中多以单相接地故障为主,且常伴随着电弧的产生,严重影响配电网稳定。因此建立有效的电弧模型,对指导配电网单相接地故障定位与故障消弧,提高配电网供电可靠性,有重要作用。笔者首先对配电网单相接地故障电弧和实测波形特点进行总结分类,接着基于现场实验参数拟合,运用回归分析方法,在MATLAB仿真软件中分别以定值电阻、分段电阻、多项式电阻的形式建立了可变电阻电弧模型,该模型聚焦于接地故障电弧外在伏安特性的准确模拟上,拟合曲线函数不存在奇异点、计算效率高。仿真结果表明,3种基于参数拟合的单相接地故障能够在一定程度上反故障电弧特征,在工程应用上具有一定的参考价值。There are frequent faults in distribution network,most of which are single-phase grounding faults,and often accompanied by the generation of arc,which seriously affects the stability of distribution network. Therefore,the establishment of an effective arc model plays an important role in guiding single-phase grounding fault location and arc suppression,and improving the reliability of distribution network power supply. The author first classifies the characteristics of arc and measured waveform of single-phase grounding fault,and then establishes the arc model in the form of fixed resistance,piecewise resistance and polynomial resistance respectively in MATLAB simulation software based on field experiment parameter fitting and regression analysis. The variable resistance arc model focuses on the accurate simulation of the external volt-ampere characteristics of the grounding fault arc. There is no singularity in the fitting curve function and the calculation efficiency is high. The simulation results show that the three single-phase grounding faults based on parameter fitting can reverse the arc characteristics of faults to a certain extent,which has a certain reference value in engineering application.

关 键 词：单相接地 实测波形 回归分析 可变电阻模型 参数拟合 

分 类 号：TM862[电气工程—高电压与绝缘技术]