一种改进指数趋近律滑模控制器的PMSM矢量控制研究

Research on PMSM Vector Control with Improved Exponential Approaching Law Sliding Mode Controller

滑模控制因其具有良好的控制性能,广泛地应用于永磁同步电机高精度调速场合。使用滑模控制设计永磁同步电机矢量控制转速环控制器时,传统的指数趋近律滑模控制器,在系统靠近滑模面时,若参数选取不当,会导致电机抖振。针对这一问题,设计了一种改进指数趋近律,在不影响系统快速性的前提下,使系统状态接近滑模面的速度更为缓慢,稳态性能更好。不同给定转速下的仿真实验证明了所提改进算法的有效性。

Sliding mode control is widely used in high-precision speed regulation of permanent magnet synchronous motors due to its excellent control performance.When using sliding mode control to design a speed loop controller for permanent magnet synchronous motor vector control,the traditional exponential approaching law sliding mode controller will lead to motor chattering if the parameters are not selected properly when the system is close to the sliding mode surface.To address this issue,an improved exponential approaching law is designed,which makes the system state approach the sliding mode surface at a slower speed without affecting the system’s speed,resulting in better steady-state performance.Simulation experiments at different given speeds have demonstrated the effectiveness of the proposed improved algorithm.