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Transformer partial discharge denoising method based on synchronous compression wavelet transform domain

A technology of synchronous compression and wavelet transform, which is applied in the direction of instruments, measuring electricity, testing circuits, etc., can solve the problems of discontinuous wavelet shrinkage coefficient, low signal-to-noise ratio, and shrinkage, etc., to achieve low signal distortion and improve signal-to-noise ratio. , to ensure the effect of precision

Active Publication Date: 2019-09-17
CHINA THREE GORGES UNIV
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Problems solved by technology

However, the hard threshold scheme will cause the wavelet shrinkage coefficients to be discontinuous, while the soft threshold denoising scheme will cause the irrelevant wavelet coefficients to shrink together, resulting in a low signal-to-noise ratio of the denoised signal

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  • Transformer partial discharge denoising method based on synchronous compression wavelet transform domain
  • Transformer partial discharge denoising method based on synchronous compression wavelet transform domain
  • Transformer partial discharge denoising method based on synchronous compression wavelet transform domain

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Embodiment Construction

[0037] The partial discharge denoising method of transformer based on synchronous compressed wavelet transform domain includes the following steps:

[0038] Step 1: Perform wavelet transform on the obtained transformer partial discharge one-dimensional time-domain signal to obtain the wavelet transform coefficient matrix of the one-dimensional time-domain signal;

[0039] Step 2: Carry out high-order statistical analysis on the wavelet transform coefficient matrix, and use the kurtosis threshold criterion to initially suppress the noise of the wavelet transform coefficient matrix, and obtain the corrected wavelet transform coefficient matrix;

[0040] Step 3: use the modified wavelet transform coefficient matrix to obtain the synchronously compressed wavelet transform coefficient matrix, and use the generalized cross-validation algorithm to obtain the noise threshold level of the synchronously compressed wavelet transform SS-CWT coefficient matrix;

[0041] Step 4: Using the n...

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Abstract

The invention discloses a transformer partial discharge denoising method based on a synchronous compression wavelet transform domain. The method comprises the following steps that: carrying out wavelet transform on an analog local signal to obtain a wavelet coefficient matrix; carrying out high-order statistics analysis on the wavelet transform coefficient matrix, utilizing a kurtosis threshold value criterion to carry out noise preliminary restraining on the wavelet transform coefficient matrix to obtain a corrected wavelet transform coefficient matrix; utilizing the corrected wavelet transform coefficient matrix to obtain a synchronous compression wavelet transform coefficient matrix, and adopting a generalized cross validation algorithm to obtain the noise threshold value level of the synchronous compression wavelet transform coefficient matrix; utilizing the noise threshold value level, and adopting a shear threshold value algorithm to carry out residual noise restraining on the synchronous compression wavelet transform coefficient matrix to obtain the synchronous compression wavelet transform coefficient matrix with small noise interference; and carrying out synchronous compression wavelet inverse transform on the synchronous compression wavelet transform coefficient matrix with small noise interference to obtain a pure partial discharge one-dimensional time domain signal. The method has the advantages of high denoising accuracy and short operation time, and is suitable for occasions of transformer partial discharge denoising.

Description

technical field [0001] The invention relates to the field of transformer partial discharge detection, in particular to a transformer partial discharge denoising method based on synchronously compressed wavelet transform domain. Background technique [0002] Partial Discharge (PD) is a highly localized microscopic discharge phenomenon. Due to the progressive deterioration of the insulation, PD can lead to complete destruction of the insulation leading to catastrophic failure of the transformer. Partial discharge one-dimensional time-domain signal is an important carrier for studying transformer partial discharge phenomenon, which is mainly interfered by narrow-band noise and white noise signal. This interference will affect the normal progress of follow-up work such as partial discharge detection and pattern recognition, so it is particularly important to suppress the interference signal. [0003] Traditional time-frequency analysis algorithms have low resolution and poor r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/14G01R31/16G06K9/00
CPCG01R31/1227G01R31/1263G01R31/14G01R31/16G06F2218/06
Inventor 徐艳春夏海廷高永康
Owner CHINA THREE GORGES UNIV
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