Robust stability and stabilisation of discrete-time descriptor systems with uncertainties in the difference matrix

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Robust stability and stabilisation of discrete-time descriptor systems with uncertainties in the difference matrix

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This study considers the problems of robust stability and stabilisation for linear discrete-time descriptor systems with norm-bounded uncertainties in all the system matrices including that in the difference matrix E. Under the assumption that the difference matrix E is rank-invariant for all admissible uncertainties, the robustness analysis problem under consideration falls into two cases: right-singular case and left-singular case. A necessary and sufficient stability condition and a sufficient stability condition are proposed for the first and second case, respectively. By using a state augmentation technique, sufficient stabilisation conditions are obtained for both cases. Furthermore, a necessary and sufficient stabilisation condition is established in the case of a non-singular matrix E. Finally, illustrative examples show that the proposed conditions are effective to design the stabilising controller for uncertain discrete-time descriptor systems with both the singular and non-singular matrixE.

Inspec keywords: linear systems; control system analysis; discrete time systems; robust control; matrix algebra

Other keywords: left-singular case; linear system; discrete-time descriptor system; nonsingular matrix; norm-bounded uncertainty; difference matrix; sufficient stability condition; stabilisation; necessary stability condition; robust stability; robustness analysis; right-singular case; state augmentation technique

Subjects: Discrete control systems; Stability in control theory; Algebra; Control system analysis and synthesis methods

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cta.2011.0377
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