Identification of low-order linear power system models from EMTP simulations using the Steigkitz-McBride algorithm

This paper presents the implementation of an efficient method for computing low order linear system models of power systems from time domain simulations. The method is the identification algorithm initially introduced by K. Steiglitz and L.E. McBride for calculating the transfer function of a linear system from samples of its input and output. The paper describes the original algorithm, added extensions, and issues addressed for its practical implementation. The applicability of the method is demonstrated by computing a low-order equivalent linear system of a detailed three-phase power system, modeled on an electromagnetic transients program (EMTP). The paper discusses practical implementation issues. Keywords - System identification, EMTP, modal analysis, Steiglitz-McBride.