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Research Papers

Linear Matrix Inequality Robust Tracking Control Conditions for Nonlinear Disturbed Interconnected Systems

[+] Author and Article Information
Ali Sghaier Tlili

Polytechnic School of Tunisia,
BP. 743, La Marsa,
Tunis 2078, Tunisia
e-mail: ali.tlili@ept.rnu.tn

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received April 16, 2016; final manuscript received November 29, 2016; published online March 22, 2017. Assoc. Editor: Zongxuan Sun.

J. Dyn. Sys., Meas., Control 139(6), 061002 (Mar 22, 2017) (8 pages) Paper No: DS-16-1192; doi: 10.1115/1.4035404 History: Received April 16, 2016; Revised November 29, 2016

Abstract

The objective of this paper is to develop a robust decentralized observer-based feedback model reference tracking control approach for a class of nonlinear disturbed interconnected systems. The proposed H control and observation design method is formulated within an optimization problem involving linear matrix inequalities (LMIs), efficiently solved by a one-step LMI procedure, to compute the decentralized observation and control gain matrices of each subsystem, and to attenuate the external disturbances affecting the subsystems by minimizing a H performance criterion. A numerical simulation is highlighted on a power system with three-interconnected machines to demonstrate the effectiveness of the developed control approach despite the interconnections between different generators, nonlinearities in the system, and external disturbances.

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Figures

Fig. 2

Robust tracking control of the three-machine power system toward strong disturbances applied on wi, i = 1, 2, 3

Fig. 4

Robust control laws ui, i = 1, 2, 3, of the three-machine power system in the case of strong disturbances

Fig. 3

Observation errors eΔδi, eωi, eΔPmi, and eΔXei, i = 1, 2, 3, of the three-machine power system in the case of strong disturbances

Fig. 1

A power system with three-interconnected machines

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