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Design of suboptimal H∞ excitation controllers

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3 Author(s)
Ahmed, S.S. ; Cape Town Univ., Rondebosch, South Africa ; Chen, L. ; Petroianu, A.

This paper presents a method to design suboptimal robust excitation controllers based on H∞ control theory. The suboptimal controller results from additional constraints that are imposed on the standard optimal H∞ solution. Global stability constraints are incorporated into the H∞ algorithm to ensure stability of the interconnected power system under decentralized control. Furthermore, a Lyapunov-based index is used to evaluate the robustness properties of the closed loop. In order to obtain a reduced order controller, the method of balanced truncation is used. The suboptimal H∞ controllers are output feedback controllers. These controllers posses superior robustness as compared to conventional PSS and optimal H∞ controllers

Published in:

Power Industry Computer Application Conference, 1995. Conference Proceedings., 1995 IEEE

Date of Conference:

7-12 May 1995

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