关键词: 永磁同步电机, 电流谐波抑制, 重复-比例积分复合控制, 小增益定理

Abstract: Due to factors such as the non-sinusoidal distribution of the motor magnetic field and the dead-time effect of the inverter,a significant amount of current harmonics exist in permanent magnet synchronous motor drive systems, which degrade the motor’ s operational performance. Repetitive control is widely used in harmonic suppression due to its multiple resonant peaks,which enable the simultaneous attenuation of disturbance signals at different frequencies. This work employs a repetitive-proportional-integral compound control to suppress harmonic. Based on the models of the permanent magnet synchronous motor and current harmonics,the structure of the repetitive control compensator is systematically designed,and
the system stability is analyzed based on the small-gain theorem. The simulation and experimental data demonstrate that this proposed method achieves effective suppression of targeted harmonics,consequently leading to a significant reduction in the current’ s total harmonic distortion.

Key words: permanent magnet synchronous motor, current harmonic suppression, repetitive-proportional-integral composite control, small-gain theorem