Research On The Deadbeat Current Predictive Control Strategy Of Permanent Magnet Synchronous Motors Incorporating Luenberger State Observer

Permanent magnet synchronous motor has the advantages of high reliability,easy maintenance and large ratio of torque to inertia,which is widely used in various industrial occasions.The deadbeat predictive current control has the advantages of fast dynamic response and good current tracking,and has been widely used in the control system of permanent magnet synchronous motor.However,due to the control delay problem existing in the digital control system,the calculated control voltage will lag one switching cycle before it can be loaded to the motor,resulting in the increase of the actual current pulsation and overshoot.At the same time,due to the dependence of the motor model on deadbeat predictive control,it is sensitive to the change of motor parameters.When the parameters of the controller and the motor are mismatched,the static current difference will occur.Aiming at the problem of the control delay and the current static difference caused by the mismatch between the controller and the motor parameters,this paper takes the permanent magnet synchronous motor as the control object,and studies a deadbeat predictive current control strategy after introducing a Luenberger state observer and disturbance compensation.Based on the deadbeat current predictive control system,a Luenberger state observer is designed to predict the current at the next moment so as to reduce the motor current pulsation caused by the contrrol delay.At the same time,aiming at the problem of current static difference caused by the mismatch between the controller and the motor parameters,the disturbance compensation link is constructed and its stability is analyzed,so as to determine the value range of the compensator parameters,reduce the current static difference caused by the mismatch between the controller and the motor parameters,and improve the parameter robustness of the deadbeat predictive current control strategy.In order to verify the feasibility and effectiveness of the deadbeat predictive current control strategy after introducing the Luenberger state observer and disturbance compensation,the simulation model was built and verified in Matlab/simulink,and the experimental verification was carried out on the DSP experimental platform with TMS320F28335 as the core.The simulation and experimental results show that the deadbeat predictive current control strategy introduced by the Luenberger state observer can effectively weaken the current pulsation caused by the control delay and improve the steady-state performance of the current loop of the system on the premise of good dynamic performance of deadbeat predictive current control.When the controller and the motor parameters do not match,the introduction of the Luenberger state observer and the deadbeat predictive current control strategy after disturbance compensation can make the output current accurately follow the current given value,effectively reducing the current static difference,Reduced the dependence of the deadbeat current predictive control on motor parameters.