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The robust H2 control problem: a worst-case design

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1 Author(s)
Stoorvogel, A.A. ; Dept. of Math. Comput. Sci., Eindhoven Univ. of Technol., Netherlands

The worst-case effect of a disturbance system on the H 2 norm of the system is analyzed. An explicit expression is given for the worst-case H2 norm when the disturbance system is allowed to vary over all nonlinear, time-varying and possibly noncausal systems with bounded L2-induced operator norm. An upper bound for this measure, which is equal to the worst-case H2 norm if the exogeneous input is scalar, is defined. Some further analysis of this upper bound is done, and a method to design controllers which minimize this upper bound over all robustly stabilizing controllers is given. The latter is done by relating this upper bound to a parameterized version of the auxiliary cost function studied in the literature

Published in:
Automatic Control, IEEE Transactions on  (Volume:38 ,  Issue: 9 )

Date of Publication: Sep 1993

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