Partial discharge signal de-noising method based on wavelet and high-order PDE

Abstract

The invention discloses a partial discharge signal de-noising method based on a wavelet and a high-order PDE, comprising the following steps: S1, inputting a collected partial discharge noise signal; S2, selecting an appropriate mother wavelet through a correlation coefficient method, selecting an appropriate decomposition layer number N, and performing wavelet transformation and decomposition on the collected noise signal; S3, performing high-order PDE processing on low-frequency sub-components in the Nth layer; S4, calculating the signal-to-noise ratio SNR of a de-noised signal, repeating S3 and S4, and stopping iteration until the SNR value output at any iteration is smaller than the SNR value output at the previous iteration; S5, performing threshold processing on high-frequency sub-components in the first to Nth layers; and S6, performing wavelet reconstruction on the processed low-frequency sub-components and high-frequency sub-components to get a de-noised partial discharge signal. The method is simple in calculation, runs fast, can better remove noise, achieves low distortion, and can retain the signal edge properly.

Description

technical field [0001] The invention belongs to the technical field of electric equipment insulation state evaluation, and in particular relates to a partial discharge signal denoising method based on wavelet and high-order PDE. Background technique [0002] Partial discharge is not only a symptom of equipment insulation degradation, but also an important cause of insulation degradation. Partial discharge signal monitoring can more sensitively reflect the early failure of equipment. Therefore, monitoring the partial discharge signal of high-voltage equipment can timely detect hidden troubles, Predict the operating life and ensure the safe and reliable operation of high-voltage equipment. Since the high-order PDE denoising does not depend on the selection of the threshold, and can perform multiple iterative denoising as required, many applied researches have been carried out in image denoising and vibration signal purification. The use of wavelet and higher-order PDE to supp...

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Problems solved by technology

[0004] The purpose of the present invention is in order to overcome the shortcoming of above-mentioned prior art, has proposed a kind of partial discharge signal denoising method based on wavelet and high-order PDE, to solve the severe waveform distortion problem of the partial discharge signal that detects, improve denoising efficiency effect and speed

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