高电压技术2013，Vol.39Issue(2)：342-347,6.DOI:10.3969/j.issn.1003-6520.2013.02.013
基于高阶累积量的局部放电超高频信号时延估计算法
Time-delay Estimation Algorithm of Partial Discharge Ultra High Frequency Signals Based on Higher-order Cumulant
摘要
Abstract
Time-delay estimation is the basis of the location algorithm for partial discharge based on time difference in substations, and it is the key to the accuracy of location. According to the higher-order statistics theory raised by Tugnait, a novel time delay estimation algorithm for partial discharge ultra-high frequency (UHF) signals is put forward based on 4-order cumulant. The algorithm substitutes high-order cumulants for the signals themselves to analyze the correlation, then the signal time delay is gained after estimating the time delay between signals. The presented method has advantages in its insensitive to Gaussian noises with unknown related characteristics. The signals of the UHF caused by partial discharge are simulated by double exponential oscillation decay function, interfered by Gaussian noises and fixed-frequency signals, meanwhile, the accuracy of the algorithm has been verified by the simulated signals. Finally the algorithm has been used to calculate the time delay of field partial discharge(PD) signals, and the sequence of the delay has been applied to substation PD location based on antenna array. The PD source location is estimated, and the locating error is less than 0. 3 m. Therefore the effectiveness and practicality of the algorithm are verified.关键词
时延估计/变电站/局部放电/定位算法/超高频(UHF)/高阶累积量Key words
time-delay estimation/ substation/ partial discharge/ location algorithm/ ultra high frequency (UHF)/ higher-order cumulants引用本文复制引用
侯慧娟,盛戈皞,朱文俊,王红斌,江秀臣..基于高阶累积量的局部放电超高频信号时延估计算法[J].高电压技术,2013,39(2):342-347,6.基金项目
国家高技术研究发展计划(863计划)(SS2012AA050803) （863计划）
上海市科委项目(10dz1203000). （10dz1203000）
