A concept of vector L2-gain is presented for switched systems. Each subsystem does not necessarily have L2-gain in the classic sense but is assumed to have individual L2-gain during any time interval when the subsystem is active. Stability is derived from this vector L2-gain under some constraints on inactive storage functions. Asymptotic stability is also achieved if in addition a small-time norm-observability property is imposed. A small-gain theorem for feedback switched systems with vector L2-gain assured for each subsystem is established. The small-gain condition is given in terms of the L2-gains of the coupled active subsystems and the changes of inactive storage functions. A switching law design method is also given to achieve vector L2-gain. © 2009 Elsevier Ltd. All rights reserved.
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