For an inductor-capacitor–inductor (LCL) equipped high-speed permanent magnet synchronous machine (LCL-HSPMSM) with the inverter current feedback (ICF), the resonance frequency of the LCL filter is typically designed higher than one-sixth of the sampling frequency to accommodate the high electrical frequency. However, this design inherently poses a challenge to system stability in a digital system, primarily due to the presence of computation delays. This article proposes a two-degree-of-freedom (2DOF) current control strategy with reduced delay. Employing the proposed method, the system achieves strong stability, eliminating the need for active damping (AD). First, a mathematical model of the LCL-HSPMSM is formulated, which serves as the foundation for analyzing the stability concerning delays. Subsequently, a 2DOF control strategy is introduced, specifically tailored to the system with reduced delay. The additional DOF is provided by a feedforward controller to achieve dynamic decoupling. The delay-reducing method for the proposed control strategy is then described. In general, the whole controller design is independent of the resonance frequency, thereby exhibiting robust stability and resilience to a broad range of resonance frequency variations. Finally, the proposed method is verified in experiments, even with a carrier ratio as low as 8 and a resonance frequency close to the Nyquist frequency.


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    Title :

    Robust Fast Current Control for LCL-Equipped High-Speed PMSMs With Reduced Delay


    Contributors:
    Cheng, Chenwen (author) / Shi, Longhao (author) / Hu, Mingjin (author) / Hua, Wei (author) / Hu, Yinfeng (author)


    Publication date :

    2025-02-01


    Size :

    7316224 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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