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In this technical note, the problem of designing fixed-order robust Hinfin controllers is considered for linear systems affected by polytopic uncertainty. A polynomial method is employed to design a fixed-order controller that guarantees that all the closed-loop poles reside within a given region of the complex plane. In order to utilize the freedom of the controller design, an Hinfin performance specification is also enforced by using the equivalence between robust stability and Hinfin norm constraint. The design problem is formulated as a linear matrix inequality (LMI) constraint whose decision variables are controller parameters. An illustrative example demonstrates the feasibility of the proposed design methods.
Date of Publication: Oct. 2007