Robust control of linear time-invariant plants using periodic compensation
Khargonekar, P.; Poolla, K.; Tannenbaum, A.
Automatic Control, IEEE Transactions on
Volume 30, Issue 11, Nov 1985 Page(s): 1088 - 1096
Digital Object Identifier  
Summary: This paper considers the use and design of linear periodic time-varying controllers for the feedback control of linear time-invariant discrete-time plants. We will show that for a large class of robustness problems, periodic compensators are superior to time-invariant ones. We will give explicit design techniques which can be easily implemented. In the context of periodic controllers, we also consider the strong and simultaneous stabilization problems. Finally, we show that for the problem of weighted sensitivity minimization for linear time-invariant plants, time-varying controllers offer no advantage over the time-invariant ones.

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