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改进ESO与并联重复控制的PMSM的MFPCC研究

Improved ESO and Parallel Repetitive Control for Model-Free Predictive Current Control of PMSM

  • 摘要: 传统的无差拍预测电流控制(DPCC)依赖于精确模型,无法处理表贴式永磁同步电机(SPMSM)驱动系统中存在的直流和交流未建模干扰。基于带有超局部模型的扩展状态观测器(ESO)的无模型预测电流控制(MFPCC)降低了对某些电机参数的敏感性,增强了系统鲁棒性。然而,这种方法受到ESO带宽的限制,导致在多种运行条件下对交流干扰的干扰观测不佳,从而使系统中产生不可忽略的电流谐波。本文介绍了一种基于改进型扩张状态观测器与并联可切换重复控制器(IESO-SRC)的增强型MFPCC,该方法通过IESO去补偿主要的六次谐波,同时在中低速工况下,嵌入重复控制器去抑制被IESO放大的第12次谐波。进行仿真实验对比后,结果表明该方法可以提高动态响应、抑制电流谐波。

     

    Abstract: Traditional difference-free predictive current control (DPCC) relies on accurate models and cannot handle the unmodeled DC and AC disturbances present in surface-mounted permanent magnet synchronous motor (SPMSM) drive systems. Model-free predictive current control (MFPCC) based on an extended state observer (ESO) with a hyperlocal model reduces sensitivity to certain motor parameters and enhances system robustness. However, this approach is limited by the ESO’s bandwidth, resulting in poor observation of AC disturbances under various operating conditions and leading to non-negligible current harmonics in the system. This paper presents an enhanced MFPCC method based on an improved expanded state observer (IESO) coupled with a parallel switchable repetitive controller (SRC). This approach uses the IESO to decompensate the dominant sixth harmonic, while embedding a repetitive controller to suppress the twelfth harmonic amplified by the IESO during low-to-medium speed operation. Simulation experiments and comparisons demonstrate that this method improves dynamic response and suppresses current harmonics.

     

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