Decentralized observation in large-scale systems

This paper describes a new approach to the development of simple and efficient state observation schemes for large-scale systems described as Interconnections of several low-order subsystems. The study is conducted within a decomposition-decentralization framework and consists of obtaining Suitable modifications of a decentralized Observation scheme comprising of a set of local observers designed on the basis of the dynamics of the decoupled subsystems. The modifications sought are required to ensure a desired convergence rate for the overall observation scheme and generally involve the use of additional inputs, which account for the interconnection effects, into the local observers. The most noteworthy feature of the present results is that almost all the necessary computations are conducted at the subsystem level only, thus leading to simple and practicable observer designs.