Simulation of a new method in double closed loop for slip power recovery motor with chopper

In order to improve the dynamic performance of slip power recovery motors, a new method of double closed loop control system is proposed by using auto-disturbance-rejection-controller (ADRC) as auto speed regulator (ASR) and conventional proportional-integral-derivative (PID) controller as auto current regulator (ACR). Nonlinear dynamical model is built and used to design the inner loop PID controller. However, the design of ADRC in outer loop does not depend on the mathematical model due to using extended state observer (ESO) to estimate and compensate the uncertainties and total disturbance, using tracking differentiator (TD) to arrange a desirable transition process and utilizing the control law of a nonlinear function of state error and its differential without integrator. The simulation results of this control strategy for motor drive show that this system has strong anti-disturbance capacity, fast response, nearly non-overshoot, so the system dynamic performance is improved in contrast with the conventional PID controller.