volume | PIER Journals

Abstract

Improving only the speed-loop controller in a PMSM drive system is insufficient to address limitations in the current loops, such as integral saturation and severe oscillations. To achieve high-performance current control across the speed-current loop structure, this paper proposes an improved non-singular fast terminal sliding mode continuous composite control (INFTSMC) method, integrated with a fast super-twisting sliding mode observer (STSMO). First, a state-space model of the PMSM speed-current loops is established. Then, the speed and current loop controllers are designed using the STSMO within the INFTSMC framework. The fast super-twisting control law is adopted to reduce the number of observer parameters and to mitigate the severe oscillations caused by high gains in conventional sliding mode observers. Finally, the proposed composite control strategy is compared with conventional PI and SMC+SMO controllers through both simulation and RT-LAB experiments. The results demonstrate that the proposed approach significantly enhances the dynamic response performance of the PMSM drive system.

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Professor Junqin Liu

Dr. Zhentong Wang

Dr. Feng Deng

Professor Kaihui Zhao

Dr. Xiangfei Li