Research On Permanent Magnet Synchronous Motor Control System Based On Adaptive Periodic Disturbance Observer

In actual production,the permanent magnet synchronous motor(PMSM)control system is affected by a variety of disturbances dominated by load fluctuations.The disturbances cause the performance of the motor system to deteriorate and even fail to operate normally.This article focuses on the problem of PMSM operation pulsation caused by periodic load disturbance.Based on the principle of Disturbance Observer(DOB),a Periodic Disturbance Observer(PDOB)with a specific disturbance compensation frequency is designed.Above,add an adaptive notch filter(ANF)to make PDOB follow the frequency change of periodic interference to change the compensation frequency.The above control structure is applied to the PMSM system to face the periodic load disturbance of unknown frequency and improve the anti-periodic disturbance ability of the PMSM control system.Based on the principle of internal model and periodic signal characteristics,this paper adds a reasonable disturbance internal model to the Disturbance Observer(DOB),optimizes the Q filter,and sets related parameters in conjunction with the system amplitude-frequency characteristics,and proposes a PDOB design program that can accurately observe specific frequency disturbances.In addition,the Steiglitz-Mcbride method(SMM)is used to improve the adaptive notch filter(ANF),combined with the adaptive algorithm to verify that SMM-ANF has good frequency estimation capabilities and the ability to track frequency changes.Moreover,the periodic interference frequency estimated by ANF is accurately transmitted to the PDOB by designing a reasonable filtering link to obtain an adaptive periodic disturbance observer(APDOB).The standard control system with APDOB is used for numerical simulation,and the system disturbance response output is compared to show that the APDOB system has accurate periodic disturbance estimation and compensation characteristics.In order to verify the feasibility of applying APDOB to the PMSM system,this paper builds the current loop compensation model of APDOB for PMSM system based on the simulink simulation platform,combines the periodic load form in actual production to carry out simulation experiments,and compares indicators such as the motor speed fluctuation,q-axis current and rotor angle error before and after the addition of APDOB system.The simulation results show that the APDOB system can effectively reduce the fluctuation of motor operation caused by the change of the periodic load.In addition,the motor drive system with periodic load is an experimental platform.By comparing the motor speed and rotor position error under different control strategies,it is verified under actual conditions that the APDOB control strategy can effectively suppress the motor running pulsation and improve the anti-periodic disturbance capability of the PMSM system,thereby improve the stability of motor operation.Therefore the APDOB has important practical significance for motor-driven production activities.