关键词: 永磁同步电机, 直流母线电压波动, 无模型预测电流控制, 扰动动态补偿

Abstract: To address the issue of increased current harmonics in permanent magnet synchronous motor drive systems caused by DC-link voltage fluctuations, this paper proposed a model-free predictive current control strategy. This strategy treated current harmonics as disturbances and incorporates a predictive model and lumped variables, utilizing an extended state observer to achieve real-time estimation and dynamic compensation of the disturbances. It does not rely on precise motor parameter models, thus ensuring robustness against motor parameter variations. Experimental results demonstrated that under conditions of severe DC-link voltage fluctuations, the proposed strategy effectively reduced current harmonic
content and total harmonic distortion, thereby optimizing motor performance.

Key words: permanent magnet synchronous motor, DC-link voltage fluctuations, model-free predictive current control, dynamic disturbance compensation