Improved IMC-PID-Fractional-Order Multiloop Controller Design for Non Integer Order Multivariable Systems

[+] Author and Article Information
Tassadit Chekari

Ph.D Student, Laboratoire de Conception et Conduite des Systèmes de Production (L2CSP), Mouloud Mammeri University, Tizi Ouzou, Algeria

Rachid Mansouri

Professor, Laboratoire de Conception et Conduite des Systèmes de Production (L2CSP), Mouloud Mammeri University, Tizi Ouzou, Algeria

Maamar Bettayeb

Professor, Electrical & Computer Engineering Department, University of Sharjah, United Arab Emirates and Distiguished Adjunct Professor, Center of Excellence in Intelligent Engineering Systems (CEIES), King Abdulaziz University, Jeddah, Saudi Arabia

1Corresponding author.

ASME doi:10.1115/1.4041353 History: Received December 13, 2017; Revised August 16, 2018


This paper is aimed to propose a multiloop control scheme for Fractional Order Multi-Input Multi-Output (FO-MIMO) systems. It is an extension of the FO-multiloop controller design method developed for integer order multivariable systems to FO-MIMO ones. The interactions among the control loops are considered as disturbances and a 2DOF paradigm is used to deal with the process outputs performance and the interactions reduction effect, separately. The proposed controller design method is simple, in relation with the desired closed loop specifications and a tuning parameter. It presents an interest in controlling complex MIMO systems since Fractional Order models (FO-models) represent some real processes better than integer order ones and high order systems can be approximated by FO-models. Two examples are considered and compared with other existing methods to evaluate the proposed controller.

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