Research On High Performance Control Strategy Of Permanent Magnet Synchronous Motor

With the continuous emergence of permanent magnet materials with excellent performance,permanent magnet synchronous motors(PMSM)have been used to different degrees in different fields,and the promotion rate and application rate continue to rise,so the performance requirements of the speed control system are also increasing rapidly.In this regard,PMSM is used as the controlled object,and the direct torque control(DTC)technology based on space vector modulation(SVM)is used as the application scheme of PMSM speed control system.The control strategy is improved,from theoretical analysis,modeling simulation and experimental testing in three aspects.This paper analyzes the application,control technology development and structural characteristics of PMSM.Establish mathematical models for different coordinate systems.Based on the realization of DTC technology and SVPWM theory,the focus is on the SVM-DTC technology of flux and torque closed loop.The traditional SVM-DTC control performance is often limited by the PI regulator parameters.Although the traditional sliding mode control(SMC)overcomes the shortcomings of the poor robustness of the PI algorithm,there are some shortcomings such as steady-state chattering.This paper proposes a sliding mode control based on the new approach law.The new sliding mode control(NSMC)is applied to the speed loop of the SVM-DTC speed control system.The simulation shows that the NSMC can quickly and accurately track the target value of the predetermined speed compared with the SMC and PI,and smoothly turn to stability state effect.In order to improve the observation accuracy and convergence speed of the linear active disturbance rejection control(LADRC)on the unknown disturbance of the system,an improved linear expansion state observer(LESO)LADRC(LESO-LADRC)is proposed.The design approach of this algorithm is studied in the speed loop and magnetic,the simulation results show that the algorithm improves the system speed response,the tracking effect is good,and the flux linkage fluctuation is reduced.In order to further improve system performance,reduce the number of controllers,introduce model prediction ideas,propose SVM-MPC,and use the improved LESO-LADRC algorithm for speed loop.The simulation results show that the dynamic quality of the system is improved,the flux output is stable,and it has good dynamics static performance.On the basis of theoretical analysis and system simulation,a set of complete PMSM speed control system is explained in depth from the aspects of software and hardware,and the main module schematic design of the hardware and the design flow of each sub-module of the software are given.Several important links have been targeted software testing.The hardware platform with TMS320F28069 as the control core is built.The algorithm performance test is carried out on the platform,and the experimental results are analyzed.The control effect is basically consistent with the theory.The correct validity of the algorithm is verified from the experimental point of view,and the expected results of the project are achieved.It has certain reference value for engineering applications.