Disturbance observer-based sliding mode control strategy of PMSM against mismatched disturbance

Abstract

This paper presents a disturbance observer-based sliding mode control strategy of PMSM to address overcurrent and mismatched disturbances. A time-varying disturbance observer is proposed to reduce the influence of mismatched disturbances and estimated peaks. Then, an integral sliding mode control strategy with nonlinear term is designed in permanent magnet synchronous motor control output. Then, the sliding mode surface is constructed by combining the estimates of the mismatched disturbances and the integral sliding mode control. Furthermore, the stability proof of the proposed control strategy is developed. Experimental results are given to validate effectiveness of the proposed control strategy. The proposed control strategy can improve speed control performance under the mismatched disturbances and overcurrent.

Keywords

• Permanent magnet synchronous motor
• Overcurrent protection
• Integral sliding mode control
• Disturbance observer
• Speed regulation