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VFTO spectrum analysis method based on continuous wavelet transform and hard threshold denoising

A technology of wavelet transform and spectrum analysis, which is applied in the field of spectrum analysis, can solve problems such as errors and errors in spectrum analysis results, and achieve the effect of suppressing frequency components

Inactive Publication Date: 2019-04-02
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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Problems solved by technology

The Fourier transform is only suitable for the analysis of stationary signals. When it is used for the spectrum analysis of non-stationary signals, the results of the spectrum analysis have errors or even errors.

Method used

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  • VFTO spectrum analysis method based on continuous wavelet transform and hard threshold denoising
  • VFTO spectrum analysis method based on continuous wavelet transform and hard threshold denoising
  • VFTO spectrum analysis method based on continuous wavelet transform and hard threshold denoising

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Embodiment Construction

[0029] 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

The invention discloses a VFTO spectrum analysis method based on continuous wavelet transform and hard threshold denoising, comprising the following steps of: performing continuous wavelet transform on VFTO time-domain waveform by using basic wavelet; performing hard threshold denoising on the results of the continuous wavelet transform to obtain a denoised time spectrum; and extracting amplitude-time characteristics of a specific frequency component from the time spectrum. Through the VFTO spectrum analysis method based on the continuous wavelet transform and the hard threshold denoising, theamplitude-time characteristics of the frequency components and the frequency of the VFTO are obtained, which helps the GIS designers to specifically suppress the harmful frequency components in the VFTO.

Description

technical field [0001] The invention relates to the technical field of spectrum analysis, in particular to a VFTO spectrum analysis method based on continuous wavelet transform and hard threshold value denoising. Background technique [0002] Gas insulated substation has the advantages of compact structure, small space occupation, high operational reliability and easy maintenance, so it has been widely used in cities and densely populated areas. GIS equipment is used in all UHV power transmission and transformation projects in China. During the operation of the isolating switch in GIS, due to the different voltages at both ends of the isolating switch, when the voltage between the ports is greater than the insulation strength of the air gap between the ports, the voltage breaks down the air gap to generate a step voltage traveling wave. Due to the compactness of the GIS The structure of the voltage traveling wave occurs frequent refraction and reflection at the node where th...

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 李帅徐现昊秦佳峰林颖辜超李立生李程启张鹏平汪鹏由新红白德盟郑文杰杨祎
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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