Robust Control for Uncertain Linear System Subject to Input Saturation

Qingyun Yang and Mou Chen

Journal of Applied Mathematics, 2014, vol. 2014, 1-12

Abstract:

A robust control scheme using composite nonlinear feedback (CNF) technology is proposed to improve tracking control performance for the uncertain linear system with input saturation and unknown external disturbances. A disturbance observer is presented to estimate the unknown disturbance generated by a linear exogenous system. The designed gain matrix of the disturbance observer is determined by solving linear matrix inequalities (LMIs). Based on the output of the designed disturbance observer, a robust CNF controller including a linear feedback control item and a nonlinear item is developed to follow the desired tracking signals. The linear feedback controller is designed using LMIs and the stability of the closed-loop system is proved via rigorous Lyapunov analysis. Finally, the extensive simulation results are presented to illustrate the effectiveness of the proposed control scheme.

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnljam:803842

DOI: 10.1155/2014/803842

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