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LMI characterization of fractional systems stability. (English) Zbl 1125.93051
Sabatier, J. (ed.) et al., Advances in fractional calculus. Theoretical developments and applications in physics and engineering. Dordrecht: Springer (ISBN 978-1-4020-6041-0/hbk; 978-1-4020-6042-7/e-book). 419-434 (2007).
Summary: The notions of linear matrix inequalities (LMI) and convexity are strongly related. However, with state-space representation of fractional systems, the stability domain for a fractional order ν, 0<ν<1, is not convex. The classical LMI stability conditions thus cannot be extended to fractional systems. In this paper, three LMI-based methods are used to characterize stability. The first uses the second Lyapunov method and provides a sufficient but nonnecessary condition. The second and new method provides a sufficient and necessary condition, and is based on a geometric analysis of the stability domain. The third method is more conventional but involves nonstrict LMI with a rank constraint.
MSC:
93D05Lyapunov and other classical stabilities of control systems
93D99Stability of control systems
26A33Fractional derivatives and integrals (real functions)
93B50Synthesis problems