Abstract
The finite-time stability (FTS) problem of discrete-time switched singular systems consisting of all unstable modes is investigated in this paper. By means of dynamic decomposition technique, the original singular system is converted to a reduced-order normal discrete-time switched system. Following the idea of getting into each unstable mode, its internal behaviour is analysed in detail. Two approaches, namely, the Lyapunov one and the state transition matrix one, are utilised to design the switching law with mode-dependent average dwell time such that the FTS property is guaranteed. It is shown that each of them has its own advantages. Selecting appropriate one depends on the specific object for study. In addition, the corresponding asymptotic stability criteria can be easily derived as a by-product. Finally, two examples are given to verify the obtained results and illustrate the effectiveness of the proposed strategies.
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