Current Harmonics Suppression Strategy for Permanent Magnet Synchronous Motor Based on Bandwidth Adaptive Second-Order Generalized Integrator Extended State Observer

A current harmonic interference suppression strategy for permanent magnet synchronous motors (PMSM) is proposed, which is improved on the basis of the traditional current loop active disturbance rejection controller (ADRC). The disturbance harmonics in the current observation error are extracted by the second-order generalized integrator (SOGI), which improves the observation accuracy of the extended state observer (ESO); The introduction of an integrator reduces the bandwidth pressure of ADRC, which can be appropriately reduced and adaptively changed with the motor speed, so as to ensure the elimination of most current harmonics and reducing the influence of high- frequency noise caused by sampling and other processes, and finally achieve the goal of reducing torque fluctuations.