A two-level control coordination in interconnected power systems

A general class of nonlinear models unifying dynamical systems is defined. The class of nonlinear models of interest here could represent many large-scale network-type systems. An example is given from electric power systems to show that typical models used for such systems belong to the general class of nonlinear systems defined. A two-level control design is proposed for a specific subcategory of this class, in which the number of controls is the same as the number of subsystems. Although an extension of the proposed results to the class for which this assumption is not satisfied is hard, it could be shown that even the subcategory studied here is very important in practice. A state coordinate transformation required for feedback linearizing control on the primary level is discussed.