Use of frozen-time H_∞ controllers in time-varyingapplications
Iglesias, P.A.
Control Theory and Applications, IEE Proceedings -
Volume 146, Issue 1, Jan 1999 Page(s):31 - 36
Digital Object Identifier   10.1049/ip-cta:19990369
Summary:This paper considers the use of frozen-time H_∞ optimal controllers for time-varying applications. It is shown that, under suitable requirements on the plant, this method will result in an internally stable time-varying plant. This is done by first showing that the algebraic Riccati equations associated with the H_∞ control problem are analytic with respect to the plant data. Classical results of Desoer (1970) on the stability of frozen-time systems are then invoked

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