基于改进GCC算法的交流配电电缆局部放电在线定位方法研究
Research on Online Localization Method of Partial Discharge of AC Distribution Cable Based on Improved GCC Algorithm
肖小龙 1郭佳豪 1郭茂森 2杨景刚 1许佳杰 2方鑫 1史明明 1刘洋3
作者信息
- 1. 国网江苏省电力有限公司电力科学研究院,江苏 南京 210008
- 2. 东南大学电气工程学院,江苏 南京 210096
- 3. 国网江苏省电力有限公司,江苏 南京 210024
- 折叠
摘要
由于受到电磁噪声等因素的影响,现有的电缆局部放电定位方法不能准确定位放电故障.为处理该问题,在双端定位法的基础上,提出一种面向工程实际应用的电缆局部放电信号在线定位方法.基于改进的广义相关算法估计信号时延,并考虑局放信号的波速不定性,采用修剪均值数据滤波算法提高多定位样本下的局部定位精度.最后在仿真及试验中,通过与传统时延估计法进行对比,对所提方法的准确性进行验证.试验结果表明,相比传统的时延估计定位方法,所提方法在环境干扰严重、检测设备采样频率受限的条件下,能够有效提高时延估计精度,减小定位误差,试验定位相对误差为0.47%,满足工程实际要求.
Abstract
Due to the influence of electromagnetic noise and other factors,the existing on-line office dis-charge level method cannot accurately locate the office discharge fault.To handle it,this paper propo-ses an online localization method for cable local discharge signals that is suitable for practical engineering applications,based on the double-end localization method.The proposed method uses an improved gener-alized correlation algorithm to estimate the signal time delay,and takes into account the wave speed uncer-tainty of the local discharge signal.To improve local localizing accuracy under multiple localizing samples,a trimmed-mean data filtering speed algorithm is employed.Simulation and experimental results demon-strate that the proposed method effectively enhances time delay estimation accuracy and reduces localiza-tion error,even under complex electromagnetic noise environment and restricted sampling rates of detec-tion equipment,when compared to traditional time delay estimation localization methods.The experimental localizing relative error was found to be only 0.47%,which meets actual engineering requirements.
关键词
改进GCC算法/交联聚乙烯/局部放电/在线定位Key words
improved GCC algorithm/XLPE/partial discharge/online localization引用本文复制引用
基金项目
国网江苏省电力有限公司科技资助项目(J2021056)
出版年
2024
国家科技期刊平台
NSTL
万方数据