Proportional-integral-resonant control for the periodic disturbance minimization of the PMSM

Abstract

This paper presents the periodic disturbance minimization technique by using the proportional-integral-resonant (PIR) control scheme for the permanent magnet synchronous motors (PMSM). Flux harmonics, cogging torque, and the current sampling errors are the prominent sources of the periodic disturbances in the PMSM. The conventional proportional-integral (PI) control scheme is widely employed in the cascaded control structure to regulate the PMSM for the specified speed and control references. However, the conventional PI controllers cannot effectively minimize the periodic disturbances which produce the speed and torque ripples. Therefore, the resonant controller is coupled with the PI controller in the current control loop to minimize the periodic disturbances of the PMSM. The bandwidth of the resonant controllers is determined by the selection of the suitable gains by using the bode plot analysis. In addition, the impact of the speed change on the bandwidth of the resonant controllers is also investigated in detail by using the bode plot analysis. Finally, the comparative results of the conventional PI controller are compared with the proposed PIR current control to highlight its control efficacy. The simulation results demonstrate the better performance of the PIR control for the wide operating range compared to the conventional PI controller.