Several time-frequency analysis methods applied in spectral analysis of VFTO

被引：0

作者：

Kang, Bing ^{[1
]}

Guan, Xiangyu ^{[1
]}

Shu, Naiqiu ^{[1
]}

Hou, Tiexin ^{[2
]}

Bu, Zhengliang ^{[2
]}

机构：

[1] School of Electrical Engineering, Wuhan University, Wuhan

[2] Wuhan Guoce Hengtong Intelligent Instrument Co., Ltd., Wuhan

来源：

Gaodianya Jishu/High Voltage Engineering | 2015年 / 41卷 / 02期

关键词：

Generalized S transform; Pseudo Wigner-Ville distribution; S transform; Short-time Fourier transform; Spectral analysis; Time-frequency analysis; Very fast transient overvoltage; Wigner-Ville distribution;

D O I：

10.13336/j.1003-6520.hve.2015.02.047

中图分类号：

学科分类号：

摘要：

From the perspective of signal processing, very fast transient overvoltage(VFTO) is non-stationary signal, hence traditional Fourier transform is no longer suitable for its spectral analysis. Considering the characteristics of VFTO waveform, including wide frequency band and complex frequency components, we tried to figure out a time-frequency analysis method that is adaptive for the spectral analysis of VFTO. We compared the performance of five time-frequency analysis methods, namely short-time Fourier transform, Wigner-Ville distribution, Pseudo Wigner-Ville distribution, S transform and generalized S transform, in the spectral analysis of VFTO synthetic signals. The results show that generalized S transform has its time-frequency resolution reached higher level than the other methods at both high frequencies and low frequencies. Then we applied generalized S transform to the spectral analysis of measured VFTO waveforms, and obtained amplitude-time curves of each VFTO frequency component. The curves show that the VFTO frequency components have various durations; the higher the frequency is, the faster the amplitude attenuates and the shorter the duration is. This further demonstrated that generalized S transform was applicable and feasible to the spectral analysis of VFTO. ©, 2015, Science Press. All right reserved.

引用

页码：680 / 686

页数：6

共 23 条

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