Abstract
An H/sub /spl infin// performance preserving controller order reduction method is proposed. Here performance preservation indicates that the H/sub /spl infin// norm bound of the closed loop transfer function with reduced-order controller is not greater than the H/sub /spl infin// norm bound of the closed loop transfer function with full order controller. We assume additive perturbations to the closed-loop transfer function and obtain a sufficient condition for performance preservation. Two kinds of useful weightings are derived, and the controller reduction problem is solved via a frequency weighted model reduction problem.
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