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Previous issue date: 2017-01-23 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Tradicionalmente, a principal prote??o utilizada nos sistemas el?tricos de pot?ncia
? n?vel de distribui??o ? a prote??o de sobrecorrente, devido sua simplicidade e baixo
custo. No entanto, com a recente inser??o de geradores distribu?dos no sistema, o sentido
do fluxo de pot?ncia pode ser variado de acordo com o local de ocorr?ncia da falta, sendo
insuficiente, para algumas aplica??es, avalia??o apenas das amplitudes das correntes de
falta. Ent?o, um m?dulo direcional pode ser adicionado para fornecer informa??o do sentido
de ocorr?ncia da falta, se ? frente ou reversa ao ponto de medi??o das correntes e
tens?es. Portanto, prop?e-se nesta disserta??o de mestrado a reconstru??o das unidades
de sobrecorrente direcional de fase, de sequ?ncia positiva, negativa e zero baseadas na
transformada wavelet discreta redundante, com a qual ? poss?vel recriar as unidades de
sobrecorrente cl?ssicas por meio das energias dos coeficientes escala das correntes e as
unidades direcionais cl?ssicas por meio dos coeficientes escala das tens?es e correntes, o
que otimiza a prote??o pois n?o conta com alguns inconvenientes provenientes da transformada
de Fourier discreta. Para avalia??o do m?todo proposto, foi utilizando o sistema
de 30 barras do IEEE com gera??o distribu?da, assim como, o sistema de 230 kV do IEEE
? par?metros distribu?dos. / Traditionally, the primary protection used in low voltage power systems, as distribution
systems, is the overcurrent protection due to its simplicity and low cost. However, in
these recent years, the number of distributed generation connected to the system has been
growing, which changes the complexity of the system and require a directional module
to complement the diagnostic about the fault, providing information whether the fault is
forward or reverse according to a reference point. Therefore, in this work is proposed a
directional overcurrent protection module based on the stationary discrete wavelet transform.
This tool could recreate the standard directional overcurrent protection using just
currents and voltages scaling coefficients (low frequency), and the overcurrent protection
is recreated by using currents scaling coefficients energy, which overcomes some drawbacks
by using discrete Fourier transform. The proposed method was evaluated on the
IEEE 30 bus model with distributed generator and the IEEE 230 kV systems analysis
with distributed parameters.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22568 |
| Date | 23 January 2017 |
| Creators | Leal, M?nica Maria |
| Contributors | 03168934470, http://lattes.cnpq.br/7510091283933216, Lopes, Felipe Vigolvino, 05468182424, http://lattes.cnpq.br/3155646870666658, Oliveira J?nior, Jos? Josemar de, 02261193432, http://lattes.cnpq.br/4263696954174963, Fernandes, Marcelo Augusto Costa, 02099790469, http://lattes.cnpq.br/3475337353676349, Ribeiro, Ricardo L?cio de Ara?jo, 31804683434, http://lattes.cnpq.br/6628177274865696, Costa, Fl?vio Bezerra |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA EL?TRICA E DE COMPUTA??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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