Current signal filtering and denoising method based on generalized S transformation containing variable factor

Abstract

The invention discloses a current signal filtering and denoising method based on generalized S transformation containing a variable factor. The method comprises the following steps: firstly, converting a discrete sampling sequence of a group of continuous time domain current signals into a two-dimensional time-frequency complex matrix through generalized S transformation containing the variable factor; secondly, performing threshold filtering method processing on the two-dimensional time-frequency matrix, performing processing by using a time-frequency filter based on time-frequency spectrum distribution, reserving effective signals in a time-frequency domain, and extracting effective current signal components; and finally, obtaining a noise-removed one-dimensional time domain current signal through generalized S inverse transformation. According to the method, the current pure signal under the noise background can be effectively extracted, so that the current signal can be analyzed and processed under various working condition environments.

Description

technical field [0001] The invention belongs to the technical field of signal filtering and denoising processing, and in particular relates to a current signal filtering and denoising method based on generalized S-transform with variable factors. Background technique [0002] In engineering practice, the influence of noise on the real measured value is almost unavoidable. When a small current single-phase ground fault occurs in the distribution network, a large number of noise signals can easily overwhelm the weak fault characteristic signal, making it more difficult to extract effective fault signals, making the problem of fault location even more difficult. The noise here mainly comes from the distribution network itself. On the one hand, with the rapid development of the urban power grid, the proportion of cables in the distribution line is getting higher and higher, which aggravates the noise pollution; on the other hand, it is caused by the error of the measuring device...

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Problems solved by technology

[0003] Purpose of the invention: The present invention proposes a current signal filtering and denoising method based on the generalized S-transform with variable factors for the situation that the widely existing noise background submerges the effective signal, in order to realize the noise background from the noise background under various working conditions The purpose of extracting effective signals from

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