John S. Baras


Reduced Complexity Nonlinear H∞ Controllers: Relation to Certainty Equivalence

J.S. Baras and N.S. Patel

IFAC’96, 13th World Congress International Federation of Automatic Control, San Francisco, CA , June 30-July 5, 1996.

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This paper considers the problem of constructing reduced complexity controllers for output feedback nonlinear H∞ control. Conditions are obtained under which such controllers achieve the closed loop performance requirements. These controllers are non-optimal in general. However, in case optimality holds, they are in fact the certainty equivalence controllers. Conditions under which certainty equivalence holds are simplified, and linked to the solvability of a functional equation.


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