基于改进指数趋近律的PMSM滑模控制研究

Research on Compound Control of Permanent Magnet Synchronous Motor Based on Sliding Mode Variable Control

永磁同步电机(PMSM)控制系统中,滑模控制(SMC)以其鲁棒性强的优势得到了广泛的应用。传统的滑模控制存在着超调量大、响应速度慢、抖振严重等问题。针对以上问题,该文选择永磁同步电机为被控对象,设计了一种改进指数趋近律的滑模变结构控制器,所提趋近律对传统趋近律前的切换项进行处理改进,使系统中的运动点分成两段,当距离滑模面较远时,会加速趋近滑模面,当距离滑模面较近时,会明显削弱抖振。仿真结果显示,与传统指数趋近律相比,改进后的指数趋近律,提高了系统的快速性、稳定性以及抗扰动性。

Sliding mode control(SMC)has been widely used in permanent magnet synchronous motor(PMSM)control system for its strong robustness.The traditional sliding mode control has many problems,such as large overshoot,slow response speed and severe chattering.To solve the above problems,this paper selects the permanent magnet synchronous motor as the controlled object,and designs a sliding mode variable structure controller with improved exponential approach law.The proposed approach law improves the switching items before the traditional approach law,so that the moving points in the system are divided into two segments.When the distance is far from the sliding mode surface,the approach to the sliding mode surface will be accelerated,and when the distance is close to the sliding mode surface,the chattering will be significantly weakened.The simulation results show that compared with the traditional exponential approach law,the improved exponential approach law improves the rapidity,stability and anti-interference of the system.