Improved Sliding Mode Control of PMSM with Dead-Time Distortion Suppression

This study presents an improved super-twisting sliding mode (SSMC) control method for permanent magnet synchronous motor (PMSM) in a low-speed region. Considering the harmonics taken by dead-time of converters, a resonant-based extended state observer (RESO) based sliding mode control method is proposed to design the current regulator. Due to the salient features of RESO, the disturbances and harmonics are estimated. Then, the harmonics in current are suppressed and ripples in speed are eliminated simultaneously. The advantages of proposed method are that no extra harmonic extraction operations are required and the entire computational complexity is reduced. Finally, numerous simulation results are given to demonstrate the harmonic suppression performance of proposed approach.

I. Introduction

Permanent magnet synchronous motor (PMSM) is wildly used in electric vehicles, marine propulsion, robotics due to its foremost advantages of high efficiency and high reliability [1]. The control of PMSM attracts more and more attention from all over the world. Several effective controllers are proposed to improve the performance, such as sliding mode control (SMC) [2], direct torque control [3], predictive control [4], and adaptive control [5]. However, there are still some issues in low-speed regions that need to be investigated.