Research On Deadbeat Predictive Control Of Permanent Magnet Synchronous Motor

Permanent magnet synchronous motors have the advantages of small size,simple structure,high power density,small torque ripple and excellent working efficiency in high-precision control,so they are increasingly used in industrial manufacturing,aerospace,and household appliances.And other fields.With the increasing tension of energy and environmental resources in recent years,energy conservation and environmental protection have become the basic strategy for national development.New energy electric vehicles are an important development trend of the automobile industry in the future.Therefore,studying the high-performance control strategy of permanent magnet synchronous motor is a research hotspot in the field of motor control at home and abroad.Among them,the deadbeat predictive control method has attracted extensive attention due to its advantages of fast dynamic performance,fixed switching frequency,low current harmonic content,and easy implementation.In this paper,the research on the deadbeat predictive control algorithm of permanent magnet synchronous motor is carried out.The main work includes:Based on the basic structure of permanent magnet synchronous motor,the mathematical model of three-phase stationary coordinates is established.Then the mathematical model of the two-phase synchronous rotating coordinate system is obtained by Clark transform and Park transform.The working principle of vector control of permanent magnet synchronous motor and the implementation method of space vector pulse width modulation module are introduced.Based on the current model of the two-phase synchronous rotating coordinate system of permanent magnet synchronous motor,the deadbeat current predictive controller is designed.Aiming at the shortcomings of the deadbeat current predictive control which is susceptible to the model parameters,a sliding mode disturbance observer is used to estimate the disturbance of the parameter mismatch,and the stability of the observer is analyzed.The simulation results show that the method can effectively improve the robustness of the current controller to the parameters.Then,for the chattering problem existing in the sliding mode disturbance observer,a new exponential approach law is proposed instead of the traditional exponential approach law.The effectiveness of the proposed strategy is demonstrated by simulation.In view of the poor dynamic performance of permanent magnet synchronous motor speed loop controller,a non-differential deadbeat speed predictive controller is designed,and the load torque is used for real-time observation and compensation of the load torque to further improve the system’s ability to resist external disturbance.The simulation results show that the proposed method has stronger anti-external load disturbance performance.Finally,an experimental platform of permanent magnet synchronous motor control system based on DSP28335 is built.The experimental results and results analysis of the speed loop and current loop controller algorithms are presented.Experimental results show that the proposed strategy can improve system control performance.