access icon free New result on robust stability of switched systems with all subsystems unstable

© The Institution of Engineering and Technology
Received 05/01/2019, Accepted 10/06/2019, Revised 26/04/2019, Published 11/06/2019

In this study, the stability problem of continuous-time switched systems composed fully of unstable subsystems is considered. Unlike the hybrid conditions derived in previous literature, this study used a novel time-dependent quadratic Lyapunov function approach and a convex sufficient condition for switched linear systems is proposed in the framework of bounded maximum average dwell time (BMADT). The resulting condition in this study is enforced using the sum of squares programming. Then, the condition for switched linear systems is extended to uncertain systems and the robust stability condition is derived. Moreover, a new stability result of continuous-time switched systems with all subsystems unstable is investigated based on the BMADT conditions. The simulation shows that it is better than the results in previous literature. Two numerical examples are proposed to illustrate the authors' approach.

Inspec keywords: continuous time systems; robust control; uncertain systems; asymptotic stability; linear systems; Lyapunov methods; time-varying systems; discrete time systems; stability

Other keywords: resulting condition; uncertain systems; robust stability condition; continuous-time switched systems; unstable subsystems; switched linear systems; previous literature; stability result; hybrid conditions; BMADT conditions; novel time-dependent quadratic Lyapunov function approach; convex sufficient condition; stability problem

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

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