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Design of $H_{\infty}$ Controller with Different Weighting Functions Using Convex Combination  

Kim Min-Chan (KIMICS)
Park Seung-Kyu (KIMICS)
Kwak Gun-Pyong (KIMICS)
Abstract
In this paper, a combination problem of controllers which are the same type of $H_{\infty}$ controllers designed with different weighting functions. This approach can remove the difficulty in the selection of the weighting functions. As a sub-controller, the Youla type of $H_{\infty}$ controller is used. In the $H_{\infty}$ controller, Youla parameterization is used to minimize $H_{\infty}$ norm of mixed sensitivity function by using polynomial approach. Computer simulation results show the robustness improvement and the performance improvement.
Keywords
Convex combination; Robust control; Youla parameterization;
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