Robust combined feedback/feedforward control for fractional FOPDT systems

摘要

In this paper, a combined feedback/feedforward design methodology is proposed for fractional systems\udin order to cope with model uncertainty and to minimize performance degradation. Based on a fractional\udcommensurate uncertain model, a parametric robust controller is first designed. Then, a parametric command\udsignal for the unity feedback loop is designed. Finally, an optimal set of tuning parameters is found by solving\uda constrained min–max optimization problem in order to minimize the worst-case settling time. Simulation\udresults show the effectiveness of the methodology.