A newborn anti-windup scheme based on state prediction of fractional integrator for variable speed motor

In this paper an attempt is made to design and simulate a fractional integral state predictor anti-windup scheme with fractional order PID controller for first order plus time delayed system (FOPDT). This scheme improves the performance of the system, which is subjected to actuator saturation and change in load. In the present work it is shown that, the anti-windup fractional order PID controller improves set-point tracking performance of FOPDT system. Amongst various methods of anti-windup fractional integral state predictor scheme is suggested here. The performance of the system is compared using this method and conventional anti-windup method. A comparison of performance of the system, when using suggested method and the other conventional anti-windup method, is presented. The scheme is designed and tested on FOPDT transfer function of AC variable speed motor drive using Matlab/Simulink. The performance indices ISE, and control effort is observed to be minimized while using the proposed method.