Area Models Representing Power System Control for Large System Investigations

Abstract

Area models are models of large networks constructed on a physical basis. The models are made to give a clear overview of the principal behaviour of large systems, to give quick results and to make several different investigation methods usable. In the paper the construction of area models are described, and the properties of the models are compared with those of models made by mathematical reduction of detailed networks. Examples of use of the area models for both planning, operation, and sensitivity studies are shown. The examples deal with power frequency control and damping of inter-area oscillations in large systems. The importance of the zeros of the system transfer function to the damping is discussed.