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Disturbance Observer Based Output Feedback Controller Design for Systems with Mismatched Disturbance

Jeang-Lin Chang* and Tsui-Chou Wu
International Journal of Control, Automation, and Systems, vol. 16, no. 4, pp.1775-1782, 2018

Abstract : "For linear MIMO systems with mismatched unknown perturbations, this paper proposes a dynamic output feedback controller that uses a disturbance estimation algorithm. The proposed observer algorithm, which simultaneously estimates the system sates and the effect of an input disturbance, is successfully implemented in non-minimum phase systems. The developed control law, which uses estimation information into the controller design, can guarantee robust stabilization of the closed-loop system and sustain disturbance attenuation when the solutions to two algebraic Riccati inequalities are determined. Finally, the feasibility of the proposed method is illustrated using a numerical example."

Keyword : Disturbance observer, dynamic output feedback, mismatched disturbance, non-minimum phase.

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