基于改进K-means聚类高压电缆的局部放电定位和识别  

Localization and Identification of Partial Discharges in High Voltage Cables Based on Improved K-means Clustering

作　　者：李小龙 郭来功[1] 来文豪 王保德 韩剑秋 LI Xiaolong;GUO Laigong;LAI Wenhao;WANG Baode;HAN Jianqiu(College of Electrical and Information Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《电工技术》2025年第6期124-130,共7页Electric Engineering

基　　金：安徽省高等学校科研项目(编号2023AH051214)。

摘　　要：针对高压电缆局部放电到时产生误差导致定位不准、干扰信号导致图谱识别困难等问题,提出了一种改进K-means聚类算法。在局部放电定位时,消去非线性方程组的二阶项,将其转换成线性方程组,考虑到时误差的情况下,至少使用4个高频电流传感器测量并计算PD的初值,改进K-means聚类对初值进行聚类优化,获得最优的PD源坐标,从而对PD进行精确定位。在局部放电信号的识别过程中,建立检测信号处理甄别系统对信号进行采集、处理,产生PRPD图谱和T-F图谱,由改进K-means聚类对T-F图谱进行聚类,将PRPD图谱分类成2簇信号的PRPD图谱,根据PRPD源图谱库特征对比,准确地对信号进行识别。实验结果表明,该方法可有效分离局部放电信号和干扰信号,实现局部放电信号类型的准确识别。An improved K-means clustering algorithm is proposed to address the problems of inaccurate localisation due to errors in the arrival of partial discharges in high-voltage cables,and difficulties in map recognition due to interfering signals.In the localisation of partial discharge,by eliminating the second-order term of the non-linear system of equations and converting it into a linear system of equations,at least four high-frequency current sensors are used to measure and calculate the initial value of the PD under the consideration of the arrival error,and the improved K-means clustering is used to optimise the clustering of the initial value to obtain the optimal coordinates of the source of the PD,so as to accurately locate the PD.In the identification process of local discharge signals,a detection signal processing screening system is established to collect and process the signals,generate PRPD maps and T-F maps,and the T-F maps are clustered by the improved K-means clustering to classify the PRPD maps into two clusters of signals′PRPD maps,and accurately identify the signals according to the comparison of the features of the library of PRPD source maps.The experimental results show that the method can effectively separate the local discharge signal from the interference signal and achieve accurate identification of the type of local discharge signal.

关 键 词：局部放电 K-MEANS聚类 定位 PRPD图谱 

分 类 号：TM755[电气工程—电力系统及自动化]