Robust combined feedback/feedforward control for fractional FOPDT systems

Publisher: John Wiley & Sons Inc

E-ISSN: 1099-1514|37|5|902-921

ISSN: 0143-2087

Source: Optimal Control Applications And Methods, Vol.37, Iss.5, 2016-09, pp. : 902-921

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Abstract

Summary

In this paper, a combined feedback/feedforward design methodology is proposed for fractional systems in order to cope with model uncertainty and to minimize performance degradation. Based on a fractional commensurate uncertain model, a parametric robust controller is first designed. Then, a parametric command signal for the unity feedback loop is designed. Finally, an optimal set of tuning parameters is found by solving a constrained min–max optimization problem in order to minimize the worst‐case settling time. Simulation results show the effectiveness of the methodology. Copyright © 2015 John Wiley Sons, Ltd.