On the fragility of fractional-order PID controllers for FOPDT processes

Fabrizio Padula; Antonio Visioli

doi:10.1016/j.isatra.2015.11.010

On the fragility of fractional-order PID controllers for FOPDT processes

ISA Trans. 2016 Jan:60:228-243. doi: 10.1016/j.isatra.2015.11.010. Epub 2015 Nov 27.

Authors

Fabrizio Padula¹, Antonio Visioli²

Affiliations

¹ Dipartimento di Ingegneria dell׳Informazione, University of Brescia - Italy, Italy. Electronic address: fabrizio.padula@unibs.it.
² Dipartimento di Ingegneria Meccanica e Industriale, University of Brescia - Italy, Via Branze 38, I-25123 Brescia, Italy. Electronic address: antonio.visioli@unibs.it.

PMID: 26639055
DOI: 10.1016/j.isatra.2015.11.010

Abstract

This paper analyzes the fragility issue of fractional-order proportional-integral-derivative controllers applied to integer first-order plus-dead-time processes. In particular, the effects of the variations of the controller parameters on the achieved control system robustness and performance are investigated. Results show that this kind of controllers is more fragile with respect to the standard proportional-integral-derivative controllers and therefore a significant attention should be paid by the user in their tuning.

Keywords: Fractional-order controllers; Fragility; PID control; Tuning.