Robust Performance of Decentralized Control Systems by Independent Designs

Decentralized control systems have fewer tuning parameters, are easier to understand and tune, and are more easily made failure tolerant than general multivariable control systems. In this paper the decentralized control problem is formulated as a series of independent designs. Simple bounds on these individual designs are derived, which when satisfied, guarantee robust performance of the overall system. The results provide a generalization of the ¿-Interaction Measure introduced by Grosdidier and Morari (1986).