Alternating current signal direct current component extraction method and system and computer readable storage medium

By eliminating low-frequency harmonics step by step and limiting high-frequency noise, the problem of insufficient speed and accuracy of DC component extraction in the existing technology is solved, and fast and accurate DC component extraction is achieved.

CN122137212AActive Publication Date: 2026-06-02ZHEJIANG UNIV
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Patent Information

Application Number
CN202610486016.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-14
Publication Date
2026-06-02
Estimated Expiration
2046-04-14

AI Technical Summary

Technical Problem

In existing technologies, low-pass filters have large response delays and poor dynamic performance, while fixed parameters of band-stop filters lead to decreased extraction accuracy when the AC signal frequency shifts, making it difficult to quickly and accurately extract the DC component.

Method used

A method for eliminating low-frequency harmonics in stages is adopted. By setting a limit value significantly higher than that of the DC component, high-frequency noise and high-order harmonics are amplified and limited to a high-amplitude range, and the DC component is extracted by combining filtering processing.

Benefits of technology

It achieves rapid and accurate extraction of DC components, improves the reliability and efficiency of extraction, and reduces response delay and noise interference.

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Abstract

The invention discloses a direct-current component extraction method for an alternating-current signal. The method comprises the following steps: acquiring a to-be-processed alternating-current signal and a fundamental wave angular frequency of the to-be-processed alternating-current signal; low-frequency harmonic elimination processing is sequentially carried out on the alternating current signals according to the fundamental wave angular frequency and the order of the harmonic order from high to low, and each low-frequency harmonic elimination processing is configured as follows: current target low-frequency harmonics are eliminated, and meanwhile, high-frequency noise and higher harmonics which are not eliminated in the alternating current signals are amplified, so that the high-frequency noise and the higher harmonics trigger amplitude limiting; after the low-frequency harmonic elimination processing of the preset number of times is completed, filtering processing is carried out on the obtained signal to extract a target direct current component in the alternating current signal; wherein the amplitude limiting value of the amplitude limiting is set to be obviously higher than the amplitude of the target direct current component in the alternating current signal, so that the amplitude of the high-frequency noise and the higher harmonic after amplitude limiting is far away from the amplitude of the target direct current component. According to the method, the target direct current component can be rapidly and accurately extracted.
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