基于改进Hough变换的消弧线圈接地配电网故障选线新方法  

A Novel Fault Feeder Selection Method for Resonant Grounding Distribution Networks Based on Improved Hough Transform

作　　者：郭亮 屈新宇 王晓卫 王毅钊 田影 张帆[2] GUO Liang;QU Xinyu;WANG Xiaowei;WANG Yizhao;TIAN Ying;ZHANG Fan(Institute of Electric Power Research of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330000,China;School of Electrical Engineering,Xi'an University of Technology,Xi'an 710054,China;Institute of Electric Power Research of State Grid Shaanxi Electric Power Company Limited,Xi'an 710100,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,江西南昌330000 [2]西安理工大学电气工程学院,陕西西安710054 [3]国网陕西省电力有限公司电力科学研究院,陕西西安710100

出　　处：《中国电力》2024年第7期132-142,共11页Electric Power

基　　金：国家自然科学基金资助项目(52177114);国网江西省电力有限公司科技项目(521820220016)。

摘　　要：针对配电网在电压过零点和高阻故障时刻选线不准确的问题,提出一种适用于谐振接地系统单相接地故障的选线新方法,利用优化后的变分模态分解对各馈线零序功率进行处理,遴选出与原始零序功率相关强度最高的本征模态函数IMF(k),将IMF(k)转换为JPG格式的二维图像,再利用Hough变换检测技术,得到故障起始阶段IMF(k)的拟合直线及夹角;对各支路模态量拟合直线夹角进行比对处理,将最小综合相关系数值对应的馈线确定为故障馈线;仿真结果表明:该方法不受接地电阻、故障相角、噪声干扰、数据缺失等因素的影响,验证了所提方法的有效性。Aiming at the problem of inaccurate feeder selection in case of zero-crossing voltage and high impedance faults in distribution networks,a novel feeder selection method for single-phase grounding faults of resonant grounding systems is proposed.Firstly,the optimized variational mode decomposition(VMD)is used to process the zero-sequence power of each feeder,consequently selecting the mode IMF(k)with the highest correlation strength with the original zero-sequence power.And then the IMF(k)is convert into a two-dimensional image in JPG format,and the Hough transform detection technology is used to obtain the fitting line and angle of IMF(k)at the initial stage of the fault.The angle between the fitting straight lines of the modal quantities of each feeder is compared and processed,and the feeder corresponding to the minimum comprehensive correlation coefficient value is determined as the faulty feeder.The simulation results show that the proposed method is not affected by the factors such as ground resistance,fault phase angle,noise interference,and data loss,which verifies the effectiveness of the proposed method.

关 键 词：单相接地故障 二维图像 HOUGH变换 综合相关系数 故障选线 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM475