Sensorless control of harmonic suppression of PMSM based on CCF-ESO

In order to improve the anti-interference ability and robustness of the sensorless speed control system of permanent magnet synchronous motor (PMSM), a complex coefficient filter (CCF) is introduced to improve the extended state observer (ESO), and an active disturbance rejection control method based on CCF-ESO is proposed. In this method, a CCF is introduced on the basis of the traditional linear ESO. The frequency selection characteristic of the CCF makes full use of the reciprocal orthogonal characteristics of the harmonic disturbance of the d and q axis of the motor, which realizes the error observation of the high order harmonic disturbance, improves the observation accuracy of the harmonic disturbance, and enhances the anti-interference ability of the sensorless control system.