1995 Volume 8 Issue 11 Pages 649-658
This paper presents an alternative characterization of reduced-order controllers via LMI approach. First we give necessary and sufficient conditions for the existence of a reduced-order controller which may be suitable for multi-purpose controller design compared to former ones. And we characterize the set of all reduced-order controllers explicitly. Second we discuss the relation between our results and former ones. Finally we characterize the reduced-order H2 controller in a similar way, and give a numerical example.