Abstract
An observer theory is presented for decentralized stabilization of large-scale systems composed of interconnected subsystems, where the information structure constraint is conformable to subsystems. The major trouble in estimating the state of a subsystem or its linear function using a locally associated observer, is that the behavior of the subsystem is influenced by other subsystems through interconnections, but no information about the influence is communicated to the local observer. In this paper, we consider the influences as unmeasurable disturbances to subsystems, and propose to apply almost disturbance decoupling observers decentrally to estimate approximately the control inputs generated by local state feedback laws. The existence condition of such observers is provided. It is shown that the approximate estimates of local state feedback control inputs can serve for the real state feedback in decentralized stabilization problems.
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