Influência da resistência de amortecimento em transitórios eletromagnéticos utilizando cascatas de circuitos π: comparação entre diferentes estruturas

• Autor(a) principal: Santos, Melissa de Oliveira [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156792; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-06-25/000902297.pdf
• topic: Circuitos eletricos; Linhas de telecomunicação; Simulação (Computadores); Telecomunicações; Transitorios (Eletricidade); Computer simulation; Electric circuits; Telecommunication; Telecommunication lines; Transients (Electricity)

The study of transmission lines is fundamental, but it is impracticable to perform measurements on real transmission lines, so it is necessary to apply numerical models. Currently, the simplest way to model a transmission line is to use a large number of cascaded circuits. However, the results of the simulation include numerical errors and are influenced by numerical oscillations, result of the Gibbs phenomenon. Thus, a damping resistance (RD) is inserted to dampen the oscillations and reduce errors in simulations of transient electromagnetic propagation in transmission lines. Initially, the damping resistance was included in all circuits of the cascade, allowing very precise results and a very low error percentage. However, in an attempt to reduce computational simulation time without losing the precision obtained previously, tests are being performed with different circuit structures for the simulation of electromagnetic transients in transmission lines. In this work, two different cascade structures of circuits are presented and discussed, which are compared with the original structure that includes RD in all circuits of the cascade. The first one is an alternating structure, where a circuit contains RD in its structure while the other does not contain RD. In this case, the two circuit structures, with and without damping resistance, are applied alternately in the cascade representing the analyzed transmission line. The second structure does not contain the damping resistance in half of the total circuits of the model, this half being found in the central block of the cascade. Based on the results obtained, the new structures tested can not maintain the same precision and low error percentage of the original model that includes RD in all circuits of the cascade, even with the change and combination of the different parameters of the simulation