Study on Time-frequency Analysis Method of Very Fast Transient Overvoltage

被引：2
作者：
Li, Shuai [1 ]
Liu, Shiming [1 ]
Huang, Qiyan [1 ]
Fu, Chuanshun [1 ]
机构：
[1] Shandong Univ, Minist Educ, Key Lab Power Syst Intelligent Dispatch & Control, Jinan 250061, Shandong, Peoples R China
来源：
NINTH INTERNATIONAL CONFERENCE ON GRAPHIC AND IMAGE PROCESSING (ICGIP 2017) | 2018年 / 10615卷
关键词：
Time-frequency analysis; very fast transient overvoltage (VFTO); spectrum analysis; non-stationary signal; WAVELET TRANSFORM; POLAR FACULAE;
D O I：
10.1117/12.2304669
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The operation of the disconnector in the gas insulated substation (GIS) may produce very fast transient overvoltage (VFTO), which has the characteristics of short rise time, short duration, high amplitude and rich frequency components. VFTO can cause damage to GIS and secondary equipment, and the frequency components contained in the VFTO can cause resonance overvoltage inside the transformer, so it is necessary to study the spectral characteristics of the VFTO. From the perspective of signal processing, VFTO is a kind of non-stationary signal, the traditional Fourier transform is difficult to describe its frequency which changes with time, so it is necessary to use time-frequency analysis to analyse VFTO spectral characteristics. In this paper, we analyse the performance of short time Fourier transform (STFT), Wigner-Ville distribution (WVD), pseudo Wigner-Ville distribution (PWVD) and smooth pseudo Wigner-Ville distribution (SPWVD). The results show that SPWVD transform is the best. The time-frequency aggregation of SPWVD is higher than STFT, and it does not have cross-interference terms, which can meet the requirements of VFTO spectrum analysis.
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页数：6
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