基于非线性模式分解的配电网高阻接地选线方法  

High resistance grounding line selection method of distribution network based on nonlinear mode decomposition

作　　者：刘旺 孙正龙[1] LIU Wang;SUN Zhenglong(School of Electrical Engineering,Northeast Dianli University,Jilin 132011,China)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132011

出　　处：《电气应用》2023年第7期97-103,共7页Electrotechnical Application

摘　　要：由于故障电流微弱、故障发生时刻不确定及受线路参数和随机因素影响等原因,一直缺乏可靠的高阻接地故障选线方法。通过建立弧光高阻接地故障的等效电路,分析暂态过程中故障线路和健全线路零序电流的区别以及与母线零序电压之间的关系。然后考虑传统电弧模型难以代入等效电路进行计算的问题,提出一种适应弧光高阻接地故障解析的电弧模型及其分段线性等效方法,有效还原了高阻接地故障伴随电弧的非线性特征。经非线性模态分解(NMD)有效提取出故障零序电流。Due to the weak fault current,uncertain time of fault occurrence,line parameters and random factors affected by the lack of reliable high resistance grounding fault line selection method.The equivalent circuit of high resistance grounding fault of arc light is established and the difference between zero sequence current of faulty line and sound line and the relationship between zero sequence current and bus voltage in transient process is analyzed.Then,considering the problem that the traditional arc model is difficult to be carried into the equivalent circuit for calculation,an arc model and its piecewise linear equivalent method adapted to the analysis of arc highresistance grounding faults are proposed,which effectively restore the nonlinear characteristics of the arc associated with high-resistance grounding faults.The fault zero sequence current is effectively extracted by nonlinear mode decomposition(NMD).

关 键 词：非线性模态分解(NMD) 弧光高阻接地 分段线性等效 

分 类 号：TM862[电气工程—高电压与绝缘技术]