Enhanced ADRC of PMSM Drive System Considering Measurement Noise Suppression

The high frequency noise generated by switching devices in the permanent magnet synchronous motor drive system will cause the oscillation of the control system and affect its stability. In addition, the extended state observer in traditional ADRC has a trade-off between bandwidth gain and measurement noise, which further affects the performance of the system. This paper presents an improved extended state observer. By integrating a low-pass filter to suppress high-frequency noise and a tunable disturbance adjustment coefficient k, the Improved Extended State Observer improves the accuracy of disturbance estimation across both low- and high-frequency bands. Finally, experiments verify the feasibility and effectiveness of the Enhanced Active Disturbance Rejection Controller under measurement noise and load sudden changes in control conditions.