A new design of anti-windup control system based on integral state prediction

In view of the saturation of the traditional PI controller, a novel anti-windup controller with integral state prediction function is proposed in the direct torque control system of Brushless DC motor. Based on the analysis of the influence of the traditional speed controller model and the initial value of the integral link on the system, an integral state predictor is set up on the basis of the conventional anti-windup controller. Under the conditions of different load torque and speed, the final integral steady-state value is calculated. When the integrator reaches saturation, the system stops integrating, withdraws the constant accumulation of the speed deviation, and the estimated integral steady-state value is used as the initial input of the integrator, so that the system can achieve the effect of exit saturation quickly. The simulation and verification results show that the new anti-windup controller can effectively achieve the anti-windup effect, and can reduce the overshoot of the system, and ensure the system has good dynamic performance.