Linhas de transmissão: um modelo no domínio de fases preciso e eficiente.

Abstract

Phase-domain transmission line computational models are available in some EMTP-type programs {Electromagnetic Transients Program). These models overcome the limitations of the modal-domain models implemented in some commercial EMTP programs for situations in which asymmetry takes place such as unbalanced overhead lines and underground cables. The current Thesis presents the formulation, development and implementation of a frequency-dependent multiphase transmission line model. The following contributions are presented: the transformation matrix is considered to be complex and frequency-dependent; only one propagation time is needed to represent the line in the phase-domain; ali the characteristic admittance and propagation function matrices elements are synthesized at once by low order and accurate rational functions, directly in the phase-domain. The proposed model is validated using time-domain digital simulations focusing on computational accuracy and efficiency.