QR-DESO-Based Active Disturbance Rejection Control for PMSGs Under Aperiodic and Periodic Disturbances

Permanent magnet synchronous generators (PMSGs) are inevitably subject to aperiodic and periodic disturbances due to complex operating conditions and internal coupling effects. To improve speed regulation under such disturbances, this paper develops a hierarchical control framework that integrates a parameter-decoupled extended state observer (DESO) with quasi-resonant control. A novel parameter decoupling method enables independent tuning of the observer bandwidth and controller parameters, while the quasi-resonant control module specifically targets periodic torque ripples caused by the tower shadow effect. Simulation results under stochastic wind conditions confirm that the proposed QR-DESO significantly outperforms conventional methods, reducing the speed tracking root mean square error (RMSE) by 61.8% and the total harmonic distortion (THD) to 0.17%. The system also exhibits strong robustness against ±20% parameter mismatches, validating its effectiveness for offshore wind power applications.