DECENTRALIZED H-INFINITY CONTROLLER-DESIGN FOR LARGE-SCALE SYSTEMS

The problem of disturbance attenuation for large-scale systems using d ecentralized control is considered. The design procedure developed her e involves constructing H infinity local state feedback controls via t he Riccati equation approach, and a complete solution to this problem is carried out merely by iteratively solving a set of local algebraic Riccati equations. It is shown that when all the states are available, the H infinity norm of the closed-loop transfer function over all lin ear constant decentralized control laws is not imrpoved by allowing fe edback to be dynamic. With successively smaller values of the prespeci fied disturbance level, the local state feedback H infinity suboptimal control problem can be solved and the controller can be chosen to be static.