VFTO spectral analysis method based on STFT-WVD transform

A technology of spectrum analysis and time-spectrum, applied in spectrum analysis/Fourier analysis, etc., can solve problems affecting VFTO time-frequency analysis performance, cross-term interference, etc., achieve good time-frequency analysis performance and eliminate cross-interference items

Inactive Publication Date: 2019-02-22
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +3
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Problems solved by technology

[0006] In the embodiment of the present invention, a VFTO spectrum analysis method based on STFT-WVD transformation is provided to solve the problem in the prior art that there is cross-term interference in WVD transformation, which affects the performance of VFTO time-frequency analysis

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  • VFTO spectral analysis method based on STFT-WVD transform
  • VFTO spectral analysis method based on STFT-WVD transform
  • VFTO spectral analysis method based on STFT-WVD transform

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Embodiment Construction

[0033] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the...

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Abstract

An embodiment of the invention discloses a VFTO spectral analysis method based on STFT-WVD transform. The VFTO spectral analysis method comprises the steps of: subjecting a time-domain waveform of a VFTO to STFT time-frequency transform and WVD time-frequency transform to obtain an STFT matrix and a WVD matrix with the same dimensionality; selecting a threshold value, and binarizing elements of the STFT matrix; eliminating cross terms of the WVD matrix by utilizing the binarized STFT matrix, so as to obtain a time-frequency spectrum of the VFTO; and analyzing frequency contained in the VFTO and amplitude-time characteristics of each frequency component according to the time-frequency spectrum. The VFTO spectral analysis method eliminates the cross term interference in WVD transform by utilizing the binarized STFT, eliminates the cross interference terms in WVD transform on the basis of maintaining the highest time-frequency aggregation of WVD transform, and has better time-frequency analysis performance.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a VFTO frequency spectrum analysis method based on STFT-WVD transformation. Background technique [0002] GIS (Gas Insulated Substation) is a technology that encloses high-voltage electrical equipment such as disconnectors, circuit breakers, busbars, and voltage transformers in metal shells, and then fills them with SF6 gas as insulation. [0003] In the GIS substation, due to the low movement speed of the isolating switch contacts, in the process of closing or breaking the small capacitive current, there will be dozens or even hundreds of arc restrikes, and then VFTO (Very Fast Transient Overvoltage, special fast transient overvoltage). VFTO contains rich frequency components. When some of the frequency components match the resonant frequency of winding equipment, a resonant overvoltage will be generated between the turns of the winding, threatening the insula...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 辜超李帅秦佳峰徐现昊王喆林颖李程启白德盟杨祎郑文杰
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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