High-order NESO Based Enhanced ADRC for PMSM Drives Considering Uncertainty and Measurement Noise Suppression

Active disturbance rejection control (ADRC) is promising for permanent magnet synchronous machine (PMSM) speed regulation system. However, the control performance of ADRC scheme is generally affected by the measurement noise introduced by position sensors. To solve this problem, a high-order nonlinear extended stated observer (NESO) is proposed in this paper to directly estimate the motor speed. The bode diagrams of the high-order NESO based measurement noise suppression system obtained by frequency-sweep approach are illustrated to show its frequency domain characteristics. Taking full advantage of nonlinear control and high-order observer techniques, the proposed strategy can maintain satisfactory noise suppression performance without sacrificing the robustness of PMSM system. Comprehensive experimental results are conducted to verify the superior properties of the proposed control strategy.