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DISCRETE‐TIME OBSERVER‐BASED OUTPUT TRACKING CONTROLLER DESIGN FOR NONMINIMUM PHASE SYSTEMS WITH PERTURBATIONS
Author(s) -
Chang JeangLin
Publication year - 2007
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1111/j.1934-6093.2007.tb00431.x
Subject(s) - control theory (sociology) , bounded function , feed forward , perturbation (astronomy) , observer (physics) , tracking error , discrete time and continuous time , computer science , tracking (education) , controller (irrigation) , mathematics , control engineering , engineering , control (management) , artificial intelligence , psychology , mathematical analysis , pedagogy , agronomy , statistics , physics , quantum mechanics , biology
In this paper, an observer‐based output tracking controller for an SISO nonminimum phase discrete‐time system is proposed. When the disturbances between two consecutive sampling instances do not vary significantly, the observer algorithm can simultaneously estimate the system states and the unknown perturbation, and can render the estimation errors of system states and perturbation constrained in a small bounded region. The control law, including a feedforward term and a feedback input, can make the tracking error constrained in a small bounded region with guaranteed system stability. A numerical example is presented to demonstrate the applicability of the proposed control scheme.