Open AccessSaturated fault tolerant control based on partially decoupled unknown‐input observer: a new integrated design strategy
Author(s) -
Hashemi Mojtaba,
Egoli Ali Kamali,
Naraghi Mahyar,
Tan Chee Pin
Publication year - 2019
Publication title -
iet control theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.059
H-Index - 108
eISSN - 1751-8652
pISSN - 1751-8644
DOI - 10.1049/iet-cta.2018.6349
Subject(s) - control theory (sociology) , bounded function , fault tolerance , saturation (graph theory) , observer (physics) , scheme (mathematics) , fault (geology) , mathematics , computer science , control (management) , artificial intelligence , mathematical analysis , distributed computing , combinatorics , seismology , geology , physics , quantum mechanics
This study presents a fault tolerant control (FTC) scheme based on fault estimation (FE) for a system subject to input saturation, uncertainty,L 2‐bounded disturbance and additive faults. In this study, the saturation is represented in polytopic form, and the disturbance is partitioned into matched and unmatched parts. For the FE scheme, a partially‐decoupled unknown input observer is introduced to completely compensate for the matched part and only the unmatched part affects the FE performance. The FE and FTC schemes are integrated to ensure that the resulting closed‐loop system is stable withL 2‐gain performance. Furthermore, all sufficient conditions for robust performance are derived and cast as linear matrix inequalities (LMIs). Usage of the Young relation removes equality constraints, and thus all LMIs are solvable in a single step. Numerical simulations are provided to verify the effectiveness of the proposed scheme.