基于改进CFSFDP算法的变频谐振下电缆局部放电脉冲分离方法  

Partial Discharge Pulse Separation Method for Cables Under Variable Frequency Resonance Based on Improved CFSFDP

作　　者：黄永禄 周凯[1] 谢敏 李泽瑞 陈诗佳 奚航 HUANG Yonglu;ZHOU Kai;XIE Min;LI Zerui;CHEN Shijia;XI Hang(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Sichuan Technical Training Center,Chengdu 611133,China;State Grid Wuxi Power Supply Company,Wuxi 214000,China)

机构地区：[1]四川大学电气工程学院,成都610065 [2]国网四川省电力公司技能培训中心,成都611133 [3]国网无锡供电公司,无锡214000

出　　处：《高电压技术》2020年第12期4326-4333,共8页High Voltage Engineering

基　　金：中国博士后科学基金项目(2015T80976)。

摘　　要：变频串联谐振耐压是电力电缆交接试验中最常用的试验方法之一,但其无法检出潜伏性缺陷,而局部放电(partial discharge, PD)测试作为一种检测潜伏缺陷有效手段在变频串联谐振条件下又面临强干扰问题。为此提出了一种变频串联谐振下的电缆局部放电脉冲分离方法。该方法首先基于二阶包络线进行脉冲提取,并采取阈值策略剔除部分干扰;然后对脉冲频域及时域波形特征量进行提取,并利用基于改进的密度峰值快速搜索与聚类算法(clustering by fast search and find of density peaks,CFSFDP)对其进行自适应聚类及离散噪声剔除,从而实现局放脉冲与干扰信号的分离;最后将聚类结果返回至时域单波及局放相位分布(phase resolved partial discharge, PRPD)谱图,进一步判别局放信号簇。实验室测试结果表明,该方法可在变频电源强干扰下实现局放信号的分离与检出,为实现电力电缆谐振耐压与局放同步测试提供了一种可行的解决思路。The variable frequency resonant voltage withstand test is one of the most commonly used test methods in power cable commissioning tests, but some latent defects cannot be detected. However, the partial discharge(PD) test, as an effective method for detecting latent defects, faces strong interference under the condition of variable frequency resonant system. Therefore, a method of separating partial discharge pulses of cables based on variable frequency resonant sets is proposed. First of all, pulses are extracted based on second-order envelope. A part of interference is eliminated through threshold strategy. Then, the characteristic parameters of pulse frequency domain and waveform of time domain are extracted. And the adaptive clustering and discrete noise elimination are carried out based on the improved clustering by fast search and find of density peaks(CFSFDP), so as to separate partial discharge pulse from the interference signals. Finally, the clustering results are returned to the time domain waveform and phase resolved partial discharge(PRPD) to further identify the PD clusters. The results in laboratory show that the method can be utilized to realize the separation and detection of PD signals under strong interference generated by the variable frequency resonant sets. This method provides a feasible solution for synchronous tests of power cable variable frequency resonance and PD.

关 键 词：变频谐振 局部放电 电力电缆 干扰 脉冲分离 

分 类 号：TM855[电气工程—高电压与绝缘技术]