volume | PIER Journals

Abstract

To address the problems of low speed control accuracy and performance degradation caused by time-varying disturbances in conventional control methods for high-precision speed regulation of permanent magnet synchronous motors (PMSMs), an improved full-order model-free sliding mode control (IFOMFSMC) method based on full-order sliding mode control (FOSMC) is proposed. First, a novel ultra-local model under parameter perturbations is established. Based on this model, the IFOMFSMC is designed by combining a second-order full-order sliding mode surface with an improved double-power reaching law, which improves the speed control accuracy of the PMSM. Subsequently, a full-order extended sliding mode disturbance observer (FOESMDO) is developed by incorporating FOSMC into the extended disturbance observer. The FOESMDO estimates unknown disturbances more accurately, thereby compensating the IFOMFSMC and enhancing system robustness under complex time-varying disturbances. Finally, simulation results confirm accurate speed tracking with the proposed method. Under complex time-varying disturbance conditions, compared with the conventional control method, the IFOMFSMC improves speed response and tracking performance by 57.6% and 88.2%, respectively, while reducing steady-state speed error and torque ripple by 71.8% and 29.2%. The proposed method effectively enhances steady-state and dynamic performance as well as disturbance-rejection capability.

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Mr. Xingkai Huang

Dr. Xiangfei Li

Professor Kaihui Zhao

Dr. Meiyun Luo

Dr. Lihua Zou