A method of simplifying large dynamic systems

Abstract

Large interconnected power systems demand complex computational schemes requiring excessive time and cost for the dynamic performance analyses. A method for simplifying such large systems described by linear differential equations, using Schwarz canonical form, is presented. This method docs not require the computation of eigenvalues and eigenvectors of the system matrix as in the case of other methods (Davison 1966, Chidambara and Davison 1967, Kuppurajulu and Elangovan 1971). A linearized power system model of order 7 is considered for this type of simplification and the response of the original and the reduced fourth-order system is compared. The results are also compared with the method of state variable grouping discussed by Kuppurajulu nnd Elangovan (1971).