Set-point weight tuning rules for fractional-order PID controllers

The problem of tuning the set-point weight for fractional-order proportional-integral-derivative (FOPID) controllers is addressed in this paper. Tuning rules are given in order to use the set-point weight effectively for the recovering of the set-point following performance when the FOPID controller is tuned in order to optimize the load disturbance rejection performance. Self-regulating, integral and unstable processes are considered. Simulation results show the effectiveness of the proposed tuning rules and the comparison with integer-order PID controllers.