Research On Speed Control Strategy Of PMSM Based On ADRC

Permanent magnet synchronous motors(PMSM)have broad application prospects in fields of industrial production,national defense and military,due to their small size and high efficiency.Currently,Proportion-integration-differentiation(PID)control is widely employed for PMSM control.However,PID meets problems of overshoot and insufficient disturbance rejection ability.Active disturbance rejection control(ADRC)inherits the advantages of PID control,including independence from the model,good adaptability and anti-interference ability.Besides,ADRC shows good effects in controlling the speed system of permanent magnet synchronous motors.However,traditional ADRC cannot simultaneously consider current coupling,time delay and interference in permanent magnet synchronous motor systems.Therefore,an enhanced ADRC approach is proposed to enhance the dynamic and static features and anti-interference capacity of the permanent magnet synchronous motor control system.The primary research topics of the paper are as follows:Firstly,the working principle of PMSM is presented,and the mathematical model is established.The corresponding simulation model is constructed using PID in Matlab environment.Simulation results demonstrate that PID satisfies the essential requirements of the speed control system of the PMSM.However,the problems exist,such as speed overshoot,current coupling,and poor disturbance rejection capability.Secondly,the basic principle,design process,and parameter tuning method of ADRC are introduced.A tracking differentiator is suggested to improve the ADRC strategy,thus resolving the current coupling and delay issues in the PMSM speed control system.To begin with,the effects of current coupling and delay on the current loop and the limitations of traditional complex vector decoupling control are analyzed.Next,the tracking differentiator with a feedforward compensation factor is introduced into the ADRC to restructure the ADRC structure an,and theoretical proofs are provided.Then,the simulation results of the improved ADRC and traditional ADRC on the Matlab platform are compared and analyzed.The results show that the improved current loop ADRC can solve the problems of coupling and delay and improve the disturbance suppression capability of the current loop.Furthermore,a cascaded ADRC strategy,based on the cascaded design of extended state observer(ESO),is proposed.This approach to address the issue of disturbance impacting the speed loop of the speed control system of the PMSM.To begin with,the disturbance factors of the speed loop and the limitations of traditional ADRC are analyzed.Next,the principle and design of the cascaded ESO are presented.Then simulation was used to verify its control performance.The results show that the cascaded ESO had superior tracking accuracy and observation precision,a greater anti-noise capacity,and upgraded the PMSM speed control system’s disturbance suppression and response speed.The simulation results indicate that the proposed control strategy is viable.Finally,a physical experimental platform has been constructed.The hardware circuits and software programs are designed to evaluate the performance of the speed control system of PMSM.The improved ADRC strategy proposed is verified with experimental platform.By analyzing the experimental figure,it can be conclude that the control strategy improve the dynamic performance of the system and boost its disturbance rejection capacity.