Sba: Controle & Automação Sociedade Brasileira de Automatica
Print version ISSN 0103-1759
KUROKAWA, Sérgio et al. Decomposição modal de linhas de transmissão a partir do uso de duas matrizes de transformação. Sba Controle & Automação [online]. 2007, vol.18, n.3, pp. 372-380. ISSN 0103-1759. http://dx.doi.org/10.1590/S0103-17592007000300009.
This paper shows an alternative modal decomposition procedure of non ideally transposed three-phase transmission lines with a vertical symmetry. The procedure is based in the use of two modal transformation matrices. First, Clarke's matrix is used to separate the line in its a, b and zero components. Because a and zero components are mutually coupled they can be represented as being a two-phase line without a vertical symmetry plane. After that this two-phase line is separated in its exact modes by using an adequated modal transformation matrix. The paper describes the characteristics of the two-phase line used to represent the coupled a and zero components and it shows the application of the modal decomposition procedure in a 440 kV three-phase transmission line.
Keywords : Electromagnetic transients; frequency domain; modal analysis; transmission line.