基于快速STA与扰动观测器的PMSM滑模控制

Sliding Mode Control of PMSM Based on Fast STA and Disturbance Observer

针对永磁同步电机调速系统PI控制鲁棒性差以及传统滑模控制抖阵过大的问题,提出了一种快速超扭曲算法与扰动观测器复合的二阶滑模控制策略。采用以快速超扭曲和超扭曲算法分别设计速度和电流控制器的方法,实现了双环二阶滑模控制,解决了传统滑模存在的系统抖阵与趋近速度、鲁棒性间的矛盾;利用扩张观测器估计扰动值进行速度控制器补偿的方法,进一步提高了滑模控制的鲁棒性。仿真结果表明,所提方法可有效提高系统响应速度和鲁棒性,并抑制滑模控制的抖阵。

In order to solve the problems of poor robustness of PI control and large chattering of traditional sliding mode control in PMSM speed regulation system, a second order sliding mode control strategy composed of a fast super-twisting algorithm and a disturbance observer was proposed. By using the fast super-twisting and super-twisting algorithms to design speed and current controllers respectively, the double-loop second-order sliding mode control was realized, and the contradiction between system chattering and reaching velocity and robustness existing in the traditional sliding mode was solved. The robustness of the sliding mode control was further improved by using the method of compensating the speed controller with the disturbance estimated by an extended observer. The simulation results show that the proposed method can effectively improve the response speed and robustness of the system, and restrain the chattering of sliding mode control.