电力系统及其自动化学报2018，Vol.30Issue(5)：120-126,7.DOI:10.3969/j.issn.1003-8930.2018.05.019
HHT分析局部放电信号时模态混叠的抑制
Analysis of Suppression of Mode Mixing in Partial Discharge Signals with HHT
张安安 1徐洋涛 2都健刚 3李红伟1
作者信息
- 1. 西南石油大学电气信息学院,成都 610500
- 2. 许昌开普检测研究院股份有限公司,许昌 461000
- 3. 国网成都供电公司,成都 610041
- 折叠
摘要
Abstract
Owing to its good adaptability,Hilbert-Huang transform(HHT)has been widely used in the analysis of par?tial discharge(PD)and other nonlinear/non-stationary signals. However,the phenomenon of mode mixing,which is generated during the process of decomposition,always results in a large deviation between the analysis results and actu?al values.In this paper,wavelet packet transform is used to decompose the signal into high-and low-frequency parts at first. Then,empirical mode decomposition(EMD)is used in the reconstructed signals respectively,and the optimal correlation coefficient is adopted as the criterion for selecting valid components of intrinsic mode function(IMF)to per?form Hilbert transform.Finally,the Hilbert and marginal spectrums of the original signal are drawn.Through simula?tions as well as the analysis and verification of actual PD signals,it is proved that compared with the traditional HHT, the method proposed in this paper can suppress mode mixing effectively and express the frequency components con?tained in the signal and the time-frequency distribution more accurately.关键词
希尔伯特-黄变换/模态混叠/相关系数/小波包变换/局部放电Key words
Hilbert-Huang transform(HHT)/mode mixing/correlation coefficient/wavelet packet transform/partial dis⁃charge(PD)分类
信息技术与安全科学引用本文复制引用
张安安,徐洋涛,都健刚,李红伟..HHT分析局部放电信号时模态混叠的抑制[J].电力系统及其自动化学报,2018,30(5):120-126,7.
