Direct Torque Control for PMSM Using Active Disturbance Rejection Control Method

Abstract

This paper proposed a direct torque control (DTC) approach for permanent magnet synchronous motor (PMSM) using the active disturbance rejection control (ADRC) technology. The ADRC technology is employed to design both the speed controller and torque controller to improve the robustness of the system, hence the uncertainties and the external perturbation of the system can be observed and compensated. Then the output voltage vectors which could compensate the errors of the torque and the flux are obtained through the angle increment of stator flux generated by the torque active disturbance rejection controller. Meanwhile, the pulse-width modulation signals are modulated through space vector modulation unit to drive the motor. The proposed control approach not only overcomes the large torque and flux ripples of the conventional DTC, but also gives the better dynamic response performance of the DTC system. Finally, the simulation test is performed by Matlab to verify the effectiveness of the proposed control approach.