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See discussions, stats, and author profiles for this publication at: A robust fractional order controller for an EAF electrode position system Conference Paper · August 2014 CITATIONS 0 READS 102 4 authors: Some of the authors of this publication are also working on these related projects: Control del proceso productivo de fabricación del acero View project Fractional-order control systems View project Vicente Feliu University of Castilla-La Mancha 431 PUBLICATIONS 9,877 CITATIONS SEE PROFILE Raul Rivas-Perez Universidad Tecnológica de la Habana, José Antonio Echeverría 314 PUBLICATIONS 2,084 CITATIONS SEE PROFILE Fernando Jose Castillo Garcia University of Castilla-La Mancha 93 PUBLICATIONS 931 CITATIONS SEE PROFILE Carlos Alberto Rodriguez Martinez Ensenada Center for Scientific Research and Higher Education 8 PUBLICATIONS 10 CITATIONS SEE PROFILE All content following this page was uploaded by Raul Rivas-Perez on 27 October 2016. The user has requested enhancement of the downloaded file.
A robust fractional order controller for an EAF electrode position system Feliu-Batlle V.*, Rivas-Perez R.**, Castillo-Garcia F.J.*, Rodriguez-Martinez C.A.** ** Escuela Técnica Superior de Ingenieros Industriales, Universidad de Castilla-La Mancha, Campus Universitario s/n, Ciudad Real, C.P. 13005, Spain (e-mail: [email protected]; [email protected]) ** Department of Automatica and Computer Science, Havana Polytechnic University, Calle 114 No 11901, CUJAE, Marianao, Habana, C.P. 19390, Cuba (e-mail: [email protected]; [email protected]) Abstract: This paper proposes a simple fractional-order controller with a PI α structure for controlling the position of the electrodes of an electric arc furnace (EAF) . The dynamics of one of the three electrodes of an industrial EAF process was experimentally identified. Models of the electrode position system and the furnace electrical system (electric arc impedance model) were obtained. This identification procedure yielded an equivalent fourth order plus time delay transfer function, and showed strong plant parameter variations and measured and unmeasured disturbances . We therefore propose a new methodology for the design of fractional-order robust controllers for this system. By carrying out a partial inversion of the dynamics, a method for fractional-order robust control of first order plus time delay plants was developed and applied to this process. It was shown that the attained controllers significantly outperformed the robustness achieved with PI and PID controller (also combined with the partial dynamics inversion term), while adding only moderate complexity to the control structure. Keywords: robust control systems; fractional order controllers; electric arc furnace; electrode position system.

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