Decentralized variable structure control for mismatched uncertain large-scale systems: a new approach

In this paper, a decentralized variable structure controller for a class of large-scale systems with mismatched uncertainties is proposed. In every su bsystem, two sets of switching surfaces is introduced. New invariance condi tions are derived such that the system in the new sliding mode is completel y invariant to both matched and mismatched uncertainties. To demonstrate th e effectiveness of the proposed scheme, a decentralized variable structure controller is synthesized to perform the new sliding mode. Moreover, the st ability analysis of the overall system is also provided. (C) 2001 Elsevier Science B.V. All rights reserved.