Estudo Comparativo do Ajuste de Funções Racionais em Modelos de Linhas Aéreas de Transmissão

Túlio Oliveira Silva e Assunção; Rodolfo Antônio Ribeiro de Moura; Marco Aurélio de Oliveira Schroeder; Fernando Aparecido de Assis

doi:10.20906/sbse.v2i1.2935

Túlio Oliveira Silva e Assunção Universidade Federal de São João del-Rei (UFSJ), MG
Rodolfo Antônio Ribeiro de Moura Universidade Federal de São João del-Rei (UFSJ), MG
Marco Aurélio de Oliveira Schroeder Universidade Federal de São João del-Rei (UFSJ), MG
Fernando Aparecido de Assis Universidade Federal de São João del-Rei (UFSJ), MG

DOI: https://doi.org/10.20906/sbse.v2i1.2935

Keywords: Electromagnetic Transient, Rational Fitting, Vector Fitting, Bode’s Asymptotic Method, Overhead Transmission Line

Abstract

The overhead transmission lines are subject to several transients events, such as atmospheric discharges. For this, the study of electromagnetic transients in transmission lines is fundamental to know the response of this element before the electrical power system in cases of unexpected requests. In the existing line models in electromagnetic transient softwares, a required step is the fitting of the functions that model the line in rational functions. Therefore, this paper aims to analyze the difference between two methods of rational approximation in the study of electromagnetic transients in a single-phase overhead transmission line. The two methods used are: i) Asymptotic Bode Fitting (ABF); ii) Vector Fitting (VF) . The analyzed models are computed considering a frequency spectrum from 100 Hz to 10 MHz. According to the results, the use of the most complex model, VF, can lead to mean square errors up to 36 times smaller than those resulting from the use of the traditional ABF implemented in electromagnetic transient software, such as ATP.