Improved 2-Order Active Disturbance Rejection Control for PMSM

Traditional PMSM control system is based on the PID controllers and vector control (VC) technologies. Active disturbance rejection control (ADRC) is a new kind of control strategy which has quicker convergence and more stable response than the PID controller. The basic 2-order ADRC controller in PMSM system fails to use the current feedback and so there are large torque ripples and harmonic current. A improved ADRC controller is designed using the model compensation method where the current feedback is utilized effectively and the torque ripples and harmonic current are decreased obviously. We derive the expressions of the improved ADRC strategy in detail based on the mathematic model of PMSM and basic ADRC controller. Some simulation experiments under the three kind of controller improved ADRC, basic ADRC and traditional PID are performed. The results confirm our algorithm proper and several conclusions are summarized at last.