电测与仪表Issue(19)：123-128,6.
动态测量不确定度在局部放电信号提取中的应用
Application of Dynamic Uncertainty Measurement in Partial Discharge Signal Extraction
李慧奇 1王凯红 1李晓龙 2王平1
作者信息
- 1. 华北电力大学 河北省输变电设备安全防御重点实验室，河北 保定 071003
- 2. 国网河北省电力公司，石家庄 050021
- 折叠
摘要
Abstract
The partial discharge signal contains a lot of random noise,which makes it difficult to separate the partial discharge signal and the random noise. Aiming at such problem,a partial discharge signal extraction method based on dynamic measurement uncertainty has been proposed in this paper. The deterministic component will be separated by Gaussian fitting method,and the random component of the remaining residual after the separation will be estimated u-sing autoregressive(AR)model;the true value estimation and dynamic uncertainty measurement of noisy signal will be obtained by the combination of the deterministic component and the random component;the threshold will be deter-mined according to the 3σ rule,and the data of poor quality will be removed firstly so as to improve the filtering effect. Because of the discontinuity point in the signal after being processed,wavelet transform smoothing filter will be used to improve the extraction accuracy. Finally,the effectiveness and feasibility of the method will be verified by MATLAB simulation and experimental noisy PD signal extraction.关键词
局部放电/拟合/AR/动态测量不确定度/小波变换/MATLABKey words
partial discharge/fitting/AR/dynamic measurement uncertainty/wavelet transform/MATLAB分类
信息技术与安全科学引用本文复制引用
李慧奇,王凯红,李晓龙,王平..动态测量不确定度在局部放电信号提取中的应用[J].电测与仪表,2014,(19):123-128,6.
