Frequency-adaptive multi-harmonic tracking method, system, equipment and medium
By constructing a frequency adaptive multi-harmonic tracking method, using harmonic frequencies to build a repetitive controller and adding internal mode parameters and fractional part delay links, the problem of low tracking accuracy of harmonic signals is solved, and high-precision tracking under frequency fluctuations is achieved.
CN120433211APending Publication Date: 2025-08-05CHINA SOUTHERN POWER GRID COMPANY
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Patent Information
- Application Number
- CN202510521123.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2025-08-05
AI Technical Summary
Technical Problem
In the prior art, the tracking accuracy of harmonic signals is not high. Especially in the case of frequency fluctuations in the power system, the tracking performance of the repeating controller has significantly decreased, and the existing methods are complex and have high hardware requirements.
Method used
By obtaining the frequency of the harmonic signal, a repetitive controller is built and discretized, the internal mode parameters and fractional delay links are added, accurate approximation of frequency fluctuations is achieved and tracking accuracy is improved.
Benefits of technology
Under frequency fluctuations, high-precision harmonic signal tracking is maintained, improving the stability and tracking performance of the controller.
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Figure CN120433211A_ABST
Abstract
The invention discloses a frequency-adaptive multi-harmonic tracking method, system and device and a medium, and belongs to the technical field of harmonic signal tracking, and the method comprises the steps: obtaining harmonic frequencies corresponding to different harmonic signals in an input signal, so as to construct a repetitive controller corresponding to each harmonic signal; obtaining a discrete domain repetitive controller corresponding to each harmonic signal according to a preset delay link and the repetitive controller; internal model parameters corresponding to the delay links and fractional part delay links are obtained, so that each discrete domain repetitive controller is improved, and an improved repetitive controller corresponding to each harmonic signal is obtained; a plurality of improved repetitive controllers are connected in parallel, and the multi-type harmonic signal controller obtained after parallel connection performs signal tracking on the input signal to obtain the target harmonic signal corresponding to the harmonic frequency, so that the problem of low harmonic signal tracking precision in the prior art can be solved.
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