Research On Control Performance Optimization Of Permanent Magnet Synchronous Motor Based On Active Disturbance Rejection Control

Active disturbance rejection control(ADRC)has the advantage that the controller design does not depend on the accurate model of the system and it has strong disturbance rejection ability.It can be used in permanent magnet synchronous motor(PMSM)control system to achieve good control effect.In this paper,the decoupling performance of current loop and the disturbance rejection performance of speed loop are analyzed.The corresponding improved algorithms are designed to improve the control performance of current loop and speed loop based on the traditional ADRC method.The main research contents are as follows:Firstly,this paper analyzes the shortcomings of PI controller’s application in motor control system.The design and parameter tuning method of the first-order linear active disturbance rejection controller(LADRC)are given.Starting with the frequency domain analysis method,the effects of controller parameters on tracking performance,filtering performance of linear extended state observer(LESO)and disturbance rejection performance of closed-loop control system are systematically analyzed,which provide a theoretical basis for the latter application and improvement of LADRC.Secondly,the optimization method of current loop decoupling performance is studied.The current loop first-order LADRC is designed,and an improved LADRC current decoupling method based on cascaded LESO is proposed.The disturbance tracking performance of LADRC,disturbance rejection performance and stability of the closed-loop control system are analyzed theoretically before and after the improvement,which prove that the improved LADRC has a better disturbance rejection ability.The simulation model of current feedback decoupling control(CFDC),LADRC and improved LADRC are built in MATLAB,and the simulation results are analyzed comparatively.The results show that the improved LADRC method has the best current decoupling effect and it is not affected by the change of motor parameters,which means that the decoupling performance of current loop is improved.Thirdly,the optimization method of speed loop disturbance rejection performance is studied.The disturbance in the speed loop is analyzed and the first-order LADRC is designed.In order to reduce the disturbance estimation burden of LESO,a disturbance observer is designed and added into LADRC.Therefore,an improved LADRC based on disturbance compensation is obtained.The restrain load disturbance ability,speed regulation performance and parameter robustness of LADRC speed loop controller before and after improvement are simulated in MATLAB.The simulation results show that the improved LADRC has a better ability to observe and reject disturbance,which means that the disturbance rejection performance of speed loop is improved.Finally,the experimental platform of PMSM is built.The control algorithm is written and debugged in CCS 6.3.1.The control performance of current loop and speed loop are verified by experiments.The experimental results are consistent with the simulation results.