Research On Deadbeat Predictive Current Control Strategy Of Permanent Magnet Synchronous Motor With Internal Model Disturbance Observer

The rotor of the permanent magnet synchronous motor is a permanent magnet,which is excited by the permanent magnet,no excitation current is required,and there is no brush and slip ring.This not only makes the structure of the motor simpler,the operational reliability is improved,and the working efficiency and power density of the motor are also optimized.Because permanent magnet synchronous motors have the above advantages,they are widely used in industrial production fields such as rail transit,CNC machine tools,electric vehicles,and industrial robots.The deadbeat predictive current control calculate the control voltage at the current moment according to the motor mathematical model and the current given value,and applies the control voltage to the inverter through coordinate transformation and SVPWM modulation,so that the output current follows the given value in the next cycle.The advantages of fast dynamic response,small current ripple,and good tracking performance are widely used in permanent magnet synchronous motor control systems.However,because deadbeat predictive current control is more dependent on motor parameters,when the motor parameters change,the current loop control accuracy will be reduced.During the operation of the motor,temperature rise and magnetic saturation will cause the motor parameters to change,causing the motor parameters do not match the controller parameters,which will greatly reduce the control performance.Aiming at the problem of motor parameter changes,this paper takes permanent magnet synchronous motor as the control object,and studies a deadbeat predictive current control strategy that introduces an internal model disturbance observer.Based on the dead-beat predictive current control system of permanent magnet synchronous motors,in view of the current static error caused by the mismatch of motor parameters and controller parameters,an internal model disturbance observer is introduced for real-time compensation to reduce the changes caused by motor parameters.To improve the robustness of the deadbeat currentIn order to verify the feasibility and effectiveness of the deadbeat prediction current control strategy introduced by the internal model disturbance observer,this paper builds a Matlab/simulink simulation model and builds a DSP experimental platform with TMS320F28335 as the core,which is verified by simulation and experiment.The simulation and experimental results show that,compared with the deadbeat predictive current control,the deadbeat predictive current control strategy with the internal model disturbance observer retains the good dynamic performance of the deadbeat predictive current control.When the motor parameters do not match the controller parameters,the deadbeat predictive current control strategy of the internal model disturbance observer is introduced,and the motor parameter changes are regarded as system disturbances and compensated to effectively reduce the current static difference and make the output current accurately follow the current given value,reduce the dependence of deadbeat current predictive control on motor parameters.