Research On PMSM Control System Based On Auto Disturbance Rejection Technology

Permanent magnet synchronous motor has the advantages of simple structure,high power density and fast response speed,thus,it has occupied an important position in the field of servo.Permanent magnet synchronous motor has been applied in high-precision servo systems,at the same time,it also puts forward higher requirements on motor control performance.Aiming at the problem that the extended state observer in the auto disturbance rejection controller suffers from excessive observation burden,which led to a decrease in control performance,this paper designed an auto disturbance rejection controller based on identification compensation from the perspective of identification compensation.Firstly,this paper deduced the mathematical model of the permanent magnet synchronous motor in different coordinate systems and introduced the conventional vector control method,which analyzed the composition and mathematical model of the auto disturbance rejection controller on the basis of the former method.Besides,it proved the advantages of auto disturbance rejection control strategy by comparing with PID control strategy.Secondly,aiming at the problem that the extended state observer is overburdened by observation,this paper adopted an identification and compensation method to achieve partial compensation for the system disturbance by obtaining the rotational inertia and load torque.In terms of identification of rotational inertia,this paper used recursive least squares and model reference adaptive method.In view of the contradiction between the convergence speed and stability of the gain coefficient selection in model reference adaptive method,a variable adaptive gain model reference adaptive method was adopted.And,in terms of load torque observation,this paper used the reduced-order load torque observation method,which was used to achieve accurate observation of load torque.Then,on the basis of vector control,the current loop auto disturbance rejection controller and the identification compensation speed loop auto disturbance rejection controller was established.Besides,the simulation results were compared with the simulation results of conventional auto disturbance rejection controller,which proved the correctness and effectiveness of the identification and compensation of auto disturbance rejection controller.Finally,under the premise that both the theoretical calculation and simulation verification met the control requirements,an experimental platform of a permanent magnet synchronous motor control system with DSP / F28335 as the core was built.Through experimental tests,the effectiveness and superiority of the algorithm in this paper in practical application were verified.