基于改进SMO与高阶滑模速度控制器的永磁同步电机无位置传感器控制

Sensorless Control of Permanent Magnet Synchronous Motor Based on Improved SMO and High Order Sliding Mode Speed Controller

永磁同步电机的无位置传感器控制发展迅速,由于传统的滑模观测器(sliding mode observer,SMO)有高频抖振等问题,本文提出一种新型改进SMO控制策略。将原有的SMO控制中的开关符号函数用双曲正切函数进行替换,可以大幅减小系统抖振。同时为了进一步优化抖振问题,基于高阶滑模控制(sliding mode controller,SMC),使用Super-Twisting算法的控制策略,设计了快速Super-Twisting算法的高阶滑模控制(FSTA)速度控制器用来代替传统的无传感器控制系统中速度环所用的PI控制器,不仅可以抑制抖振,还有整定参数简单和鲁棒性强等优点。最后通过MATLAB/Simulink仿真比较了传统的基于SMO的无传感器控制系统和本文提出来的新型策略,新型策略可以有效抑制抖振,还可以提高整个系统的鲁棒性。

The sensorless control of permanent magnet synchronous motor(PMSM)develops rapidly.Aiming at the problems of traditional sliding mode observer(SMO),such as high-frequency chattering,a new improved SMO control strategy is proposed.Replacing the switch sign function with the hyperbolic tangent function can reduce the chattering of the system.Meanwhile,in order to further optimize the chattering problem,based on the Sliding Mode Controller(SMC),a control strategy based on the super-introduced algorithm was used and A High-order Sliding mode control(FSTA)speed controller is designed to replace the PI controller used in the traditional sensorless control system.This method not only can suppress the chattering-based,but also has the advantages of simplicity in setting parameters and strong robustness.Finally,the traditional sensorless control system based on SMO is compared with the proposed new strategy through MATLAB/Simulink simulation.The strategy can effectively suppress chattering and improve the robustness of the whole system.