Title: Operator-based non-linear control system design for unstable plants with input saturation

Authors: K. Umemoto; Mingcong Deng

Addresses: Graduate School of Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan. ' Department of Electrical and Electronic Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

Abstract: Operator-based robust right coprime factorisation approach is an interesting approach for non-linear control. It provides an effective framework for non-linear unstable system. In practice, the input constraint always exists, which induces that the real control input is different from the controller output, thus the input constraint may destabilise the system. However, control system design for non-linear plants with input saturation has seldom been studied due to the difficulties in dealing with non-linearity. Also in operator-based robust right coprime factorisation method, input saturation is not considered. In this paper, a new control system design for non-linear unstable plants with input saturation is proposed. Based on the robust right coprime factorisation, an operator-based switching controller is designed, which avoids the unstable region. Moreover, based on the proposed design scheme, the output tracking performance is also realised, and the effectiveness of the proposed method is verified by simulation.

Keywords: nonlinear control; input saturation; robust right coprime factorisation; operator-based switching control; unstable plants; controller design; simulation.

DOI: 10.1504/IJAMECHS.2011.043378

International Journal of Advanced Mechatronic Systems, 2011 Vol.3 No.4, pp.297 - 303

Published online: 18 Mar 2015 *

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