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Robust nonlinear integral control

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2 Author(s)
Zhong-Ping Jiang ; Dept. of Electr. Eng. & Comput. Sci., Polytech. Univ., Brooklyn, NY, USA ; I. Marcels

It is well known from linear systems theory that an integral control law is needed for asymptotic set-point regulation under parameter perturbations. The note presents a similar result fur a class of nonlinear systems in the presence of an unknown equilibrium due to uncertain nonlinearities and dynamic uncertainties. Both partial state and output feedback cases are considered. Sufficient small-gain type conditions are identified for existence of linear and nonlinear control laws. A procedure for robust nonlinear integral controller design is presented and illustrated via a practical example of fan speed control

Published in:

IEEE Transactions on Automatic Control  (Volume:46 ,  Issue: 8 )