Abstract
The control law for infinite horizon H 2 control oflinear discrete-systems with norm bounded time-varying uncertainties has been presented in the literature. In this paper, a sufficient condition for robust stability of this control is presented. Based upon the results obtained, a connection is made between the monotonic behavior of the Riccati difference equation (RDE) and the robust stability of “frozen” closed-loop systems. This connection then allows the derivation of a robust stability condition for “frozen” closed-loop systems, which depends only on the initial condition of the RDE. An example is included to illustrate the implementation of the proposed theory.
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