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Processes 2019, 7(3), 146; https://doi.org/10.3390/pr7030146

Simple Alternatives to PID-Type Control for Processes with Variable Time-Delay

1,2,*,†
,
1,2,†
and
1,2,3,†
1
DySC Research Group on Dynamical Systems and Control, Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, Technologiepark 914, B9052 Ghent, Belgium
2
Core Lab EEDT, Flanders Make, 9000 Ghent, Belgium
3
Department of Automation, Technical University of Cluj Napoca, Memorandumului Street No. 28, 400027 Cluj, Romania
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 13 December 2018 / Revised: 20 February 2019 / Accepted: 25 February 2019 / Published: 8 March 2019
(This article belongs to the Section Computational Methods)
Full-Text   |   PDF [4095 KB, uploaded 8 March 2019]   |  

Abstract

Process industries include chemicals, petrochemicals, pulp and paper, steel, minerals, food, and power generation industries. Although diverse, all of these share common dynamics in terms of continuous variables and rely on the same measurements, e.g., level, flow, temperature, and pressure. They also have common actuators, such as valves and pumps. Additionally, they have variable time delays from process dynamics, such as mixing effects, measurement lines, or wireless data communication protocols. Processes with variable time delay can often lead to poor performance and instability. This paper proposes a fractional-order (FO) control design with adaptive laws for dealing with such processes, and a comparison is analysed against other controllers established in the literature for delayed dynamics. Two examples are presented to illustrate the advantages of the proposed approach. A real time-embedded control setup and interface to industrial standard devices is tested to illustrate the implementation aspects of the proposed fractional-order control. Comparison with other established controllers is given. View Full-Text
Keywords: fractional-order control; variable time-delay; industrial devices; real-time systems; process industry fractional-order control; variable time-delay; industrial devices; real-time systems; process industry
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Copot, D.; Ghita, M.; Ionescu, C.M. Simple Alternatives to PID-Type Control for Processes with Variable Time-Delay. Processes 2019, 7, 146.

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