Study on Fuzzy PID Control in Double Closed-Loop DC Speed Regulation System

In connection with the problem that disturbance of voltage and load change will lead to the performance deterioration of the conventional PID control in a DC speed regulation system, a two closed-loop fuzzy PID control method is presented. Through fuzzy logic reference, this method dynamically tunes the three parameters of PID controller adaptively according to the speed error e and its variety rate ec. Comparison of performance between this method and the conventional one is carried out by simulations in ideal idling state, load disturbance and voltage disturbance respectively. The results indicate that two methods enjoy same stable performance in ideal idling state. In the situation of load change disturbance, the fuzzy PID control method enjoys a less stable error than the conventional one does. In the situation of voltage disturbance, the fuzzy PID control method enjoys a less drop in speed and spends less time returning to the equilibrium condition. Therefore, fuzzy PID control method guarantees tracking and anti-jamming performance of a DC speed regulation system.