Interaction modelling approach to distributed control with application to power systems

A class of systematic distributed control design methods suitable for large-scale interconnected power systems is presented in this paper. The design methods are based on: (i)distributed implementations of centralized control systems; (ii) model reduction of dynamical systems; and (iii) modelling of the interactions between the subsystems comprising the global control system. In these schemes the control task is decomposed into local subtasks. The function of each subtask is to generate the required local control input so that, collectively, the centralized performance of the global system is preserved. The local control input is composed of a control signal generated from local state feedback and a corrective control signal generated from low-order dynamic and, in some schemes, static compensators. The structure of these compensators is determined from the reduced-order model of the global closed-loop control system and from derived models of the interactions among the subsystems. A two-area interconnected power system is considered for the application of the proposed distributed control schemes. Results of time simulation studies show that the performance of the power system under the distributed control schemes presented in this paper are almost identical with the centralized one.