基于VMD和灰色综合关联度的谐振接地故障选线  

Line Selection of Resonance Grounding Fault Based on VMD and Grey Comprehensive Correlation Degree

作　　者：岳昕 张新慧[1] 王敬华[1] 于毅 YUE Xin;ZHANG Xin-hui;WANG Jing-hua;YU Yi(Electrical and Electronic Engineering College Shandong University of Technology,Zibo Shandong 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《计算机仿真》2022年第4期76-79,267,共5页Computer Simulation

基　　金：国家电网公司科技项目(SGHADK00PJJS1900192)。

摘　　要：由于非线性与非平稳性的信号频率会随着时间特征产生变化,需要通过计算所有馈线序列之间的关联度确定故障线路,因此提出基于VMD和灰色综合关联度的谐振接地故障选线方法。利用VMD分析低阻和高阻接地故障,分解所有馈线零序电流序列,得出当灰色关联度数值较低时,线路发生故障;灰色关联度数值较高时,馈线之间关联程度较高,线路为正常工作状态;当母线出现故障时,全部馈线之间的关联程度相对较高。根据上述结论,实现谐振接地故障的准确选线。通过实验证明,与传统方法对比,所设计方法选线精准度较高,利于及时对故障电路进行判断,提高了供电系统的可靠性。The nonlinear and non-stationary signal frequency will change with time characteristics, and it is necessary to determine the fault line by calculating the correlation degree between all feeder sequences. Therefore, a resonant grounding fault line selection method based on VMD and grey comprehensive correlation degree is proposed.VMD was used to analyze the grounded fault with low resistance and high resistance, and thus to decompose all the zero-sequence current sequences of feeder. When the gray correlation value was low, the line failed;When the gray correlation value was high, the correlation degree between feeders was high, and the line was normal;When the bus bar failed, the correlation degree between all feeders was relatively high. According to the above conclusions, the accurate line selection was realized. Experimental results show that the proposed method has higher accuracy in line selection than the traditional method. This is conducive to timely judgment of fault circuit. This method also improves the reliability of power supply system.

关 键 词：灰色综合关联度 谐振接地 故障选线 馈线 频率 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]