结合改进趋近律和扰动补偿的PMSM滑模控制

PMSM sliding mode control combining improved reaching law and disturbance compensation

为了进一步提高永磁同步电机滑模调速控制系统的性能,提出一种基于改进趋近律和扰动补偿的综合控制策略。首先,针对传统指数趋近律中趋近速度和系统抖振幅度存在矛盾的问题,引入滑模面的幂次函数和系统状态变量的范数设计了一种改进趋近律,其可根据系统状态动态调节控制过程,并对改进趋近律进行了抑制抖振效果的分析和稳定性分析;其次,针对系统受到扰动影响稳定性的问题,设计了一种扩展的滑模扰动观测器,对扰动进行实时观测并补偿到系统中。MATLAB/Simulink仿真结果表明:基于改进趋近律和扰动观测器的综合控制方法可以提高控制系统的鲁棒性和动态响应性能。

In order to improve the performance of sliding mode speed control system of permanent magnet synchronous motor,an integrated control strategy based on improved reaching law and disturbance compensation was proposed.First,in view of the contradiction problem between the approach speed and the amplitude of the system chattering of traditional exponential reaching law,by introducing the exponential function of the sliding mode plane and the norm of the system state variables,an improved reaching law was designed,the process could be adjusted dynamically based on the system state control,and the effectiveness and stability of the improved approach law in suppressing chattering were analyzed.Secondly,aiming at the problem that the stability of the system was affected by the disturbance,an extended sliding mode disturbance observer was designed to observe the disturbance in real time and compensate it into the system.MATLAB/Simulink simulation results showed that the integrated control method based on the improved reaching law and disturbance observer could improve the robustness and dynamic response performance of the control system.