Torque ripple suppression of permanent magnet synchronous motor based on sliding mode predictive cascade control strategy

For the permanent magnet synchronous motor drive system of traditional field-oriented control, the dual closed-loop PI cascade control structure has some drawbacks such as slow dynamic response, and poor low speed characteristic, which inevitably produces high torque ripple. Aiming at the finite switching sequence of the inverter, the optimal duty cycle predictive current control strategy is proposed to optimize the tracking performance of the torque current in the current inner loop. In the cascade structure control system, the power reaching law with sliding mode control strategy is applied to the speed outer loop to optimize torque performance during motor startup. A hybrid control algorithm combined sliding mode control with optimal duty cycle finite control set MPC is proposed to optimize the torque current setting and tracking. The proposed scheme can improve the control performance of the stator current and the robustness of the system. A performance comparison of the proposed hybrid control scheme with traditional control schemes is provided in this paper. The simulation results verify the feasibility of the proposed combined algorithm and prove that the dynamic performance of the system is improved. The purpose of suppressing the torque ripple of the motor is achieved by optimizing the torque current.