Conditions on input disturbance suppression for multivariable nonlinear systems on the basis of feedforward passivity

Authors:
Steven W. Su;Jie Bao;Peter L. Lee
Affiliations:
School of Chemical Engineering & Industrial Chemistry, The University of New South Wales, UNSW, Sydney, NSW, Australia;School of Chemical Engineering & Industrial Chemistry, The University of New South Wales, UNSW, Sydney, NSW, Australia;Division of Engineering, Science & Computing, Curtin University of Technology, Perth, WA, Australia
Venue:
International Journal of Systems Science
Year:
2006

Citing 6
Cited 0

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Abstract

In this paper, we consider the problem of input disturbance suppression for nonlinear systems based on feedforward passivity. First, we show that integral control can sufficiently suppress a class of slowly variant (including constant) input disturbance and track constant references provided certain closed-loop stability is achieved. Then, sufficient conditions of integral controllability for nonlinear processes are presented. These conditions are further relaxed by using an input and output transformation.