Simulation of Transmission Line Bend Using a Non-Uniform Transmission Line Model Based on Scattering Theory

Abstract

Modelling non-uniformities in power transmission lines for high frequencies has been a subject of interest. However, the classical multi-conductor transmission line (MTL) models used in Electromagnetic transient (EMT)-type simulators are valid only for uniform lines. Although non-uniformities in lines can be solved using full-wave techniques, they are computationally cumbersome and are therefore rarely used in power system transient simulators. This paper proposes a novel transmission line model based on scattering theory that can simulate bends in transmission lines. Solutions of the proposed model are obtainable with the same amount of computer resources as for a classical MTL model and therefore is a viable candidate for modelling non-uniform transmission lines in EMT-type simulators. Results obtained using the proposed model have been compared with those obtained using full-wave techniques.