Title: Design of adaptive PID controllers based on adaptive Smith predictor for ultra-local model control

Authors: H. Thabet; M. Ayadi; F. Rotella

Addresses: Laboratoire de Recherche LA.R.A Automatique, Ecole Nationale d'Ingénieurs de Tunis, Université de Tunis El Manar, BP 37, 1002, Tunis, Tunisia ' Laboratoire de Recherche LA.R.A Automatique, Ecole Nationale d'Ingénieurs de Tunis, Université de Tunis El Manar, BP 37, 1002, Tunis, Tunisia ' Laboratoire de Génie de Production, Ecole Nationale d'Ingénieurs de Tarbes, 65016, Tarbes CEDEX, France

Abstract: In this paper, an ultra-local model control approach based on adaptive Smith predictor is proposed. The design of adaptive PID controller takes into account the estimation of variable time delay which is compensated by the addition of an adaptive Smith predictor. The purpose of this paper is to solve the online estimation problem of time delay thanks to the proposed identification method of ultra-local model parameters. A performance comparison between the proposed control approach and the Smith predictor control with classical PID is carried out. The numerical simulation results of the thermal process study with severe constraints and operating conditions show the superiority of the adaptive PID controller. The robustness with respect to noises, disturbances and system parameter uncertainties of control approaches are highlighted.

Keywords: ultra-local model control; online time delay estimation; adaptive control; PID control; controller design; adaptive Smith predictor; robustness; robust control; numerical simulation.

DOI: 10.1504/IJAAC.2017.083311

International Journal of Automation and Control, 2017 Vol.11 No.2, pp.222 - 238

Received: 28 Apr 2016
Accepted: 28 Aug 2016
Published online: 23 Mar 2017 *

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