| Summary: | To solve the problem of high harmonic in the stator current of Permanent-Magnet Synchronous Motor (PMSM), a current harmonic suppression method combining Three-parameter Notch Filter (TNF) and Linear Active Disturbance Rejection Controller (LADRC) is proposed. First, the current loop controller adopts LADRC, and Linear extended state observer (LESO) is used to estimate the disturbance signal. The harmonic suppression performance is studied in the frequency domain. Second, the TNF is used to extract and feedforward compensation the harmonic signals of a specific frequency, which further weakens the influence of medium and low-frequency current harmonics on the performance of the motor. Finally, the simulation and experimental results verify that the proposed strategy can obviously reduce the distortion degree of the current, and improve the steady-state performance of PMSM.
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