15th Triennial World Congress of the International Federation of Automatic Control
  Barcelona, 21–26 July 2002 
ROBUST CONTROL FOR A CLASS OF UNCERTAIN STATE-DELAYED SINGULARLY PERTURBED SYSTEMS
H. R. Karimi    M. J. Yazdanpanah
Department of Electrical and Computer Engineering, Faculty of Engineering,
University of Tehran, Tehran, Iran.
Email: karimi-h@khorshid.ece.ut.ac.ir and yazdam@sofe.ece.ut.ac.ir

This paper considers the problem of robust control for a class of uncertain state-delayed singularly perturbed systems with norm-bounded nonlinear uncertainties. The system under consideration involves state time delay and norm-bounded nonlinear uncertainties in the slow state variable. It is shown that the state feedback gain matrices can be determined to guarantee the stability of the closed-loop system for all and independently of the time delay. Based on this key result and some standard Riccati inequality approaches for robust control of singularly perturbed systems, a constructive design procedure is developed. We present an illustrative example to demonstrate the applicability of the proposed design approach.
Keywords: Robust stability; Disturbance attenuation; singularly perturbed systems; Time delay
Session slot T-Tu-E15: Robust Control III/Area code 2e : Robust Control