Active and passive cooperative power grid harmonic suppression method and composite filter

By analyzing harmonic coupling characteristics and predicting rolling harmonics, the competitive compensation relationship between active and passive filters is identified, realizing dynamic coordination and timing alignment of power grid harmonic suppression methods. This solves the problem of limited control accuracy in existing technologies and improves the effect of power grid harmonic suppression.

CN122267783APending Publication Date: 2026-06-23SHENZHEN YUCI ELECTRONIC TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610382711.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-26
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing active and passive filter collaborative control methods have problems in power grid harmonic suppression, such as lack of competitive identification means for reverse injection, significant differences in response speed, and failure to dynamically correct compensation weights when harmonic distribution migrates, which leads to limited control accuracy.

Method used

By analyzing the harmonic coupling characteristics, a compensation division of labor map is generated, competitive compensation identifiers are identified, and combined with rolling harmonic prediction and response delay sorting, a composite filter coordination control command is generated to achieve dynamic coordination and timing alignment of active and passive co-operation.

Benefits of technology

It improves the control accuracy and operational stability of power grid harmonic suppression, avoids the degradation of compensation effect caused by fixed tuning offset and frequency band competition, and ensures efficient coordination of active and passive collaborative compensation.

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Abstract

The invention discloses an active and passive cooperative power grid harmonic suppression method and a composite filter. The method comprises the following steps: performing harmonic coupling characteristic analysis on power grid multi-source operation data, constructing a harmonic coupling characteristic spectrum, determining a passive compensation interval, introducing detuning polarity correction to dynamically correct a boundary, and identifying a compensation competition relationship of active and passive in an overlapped frequency band; performing rolling harmonic prediction on the compensation division map, extracting dominant frequency migration characteristics and mapping the dominant frequency migration characteristics to each branch response time delay, and generating a layered compensation activation parameter group through continuous conflict identification and activation sorting; and detecting a current zero crossing point of the preferentially activated branch, generating a switching time window through time sequence dislocation distribution, and outputting a composite filtering coordination control instruction in combination with predicted residual feedback and the adjustable margin of the branch. According to the invention, dynamic coordination of active and passive compensation frequency band division and fine alignment of a switching time sequence are realized, and the control precision and stability of cooperative compensation under a dynamic working condition are improved.
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