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Previous issue date: 2015-06-22 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Um sistema el?trico de pot?ncia t?pico ? caracterizado pela
centraliza??o da gera-
??o de energia. Entretanto, com a reestrutura??o do sistema
el?trico, esta topologia vem
modificando-se com a utiliza??o de geradores ao longo do sist
ema de distribui??o (gera-
??o distribu?da) que proporciona diversos benef?cios por l
ocalizar-se pr?ximo aos centros
de consumo. Com isso, a inser??o de geradores distribu?dos,
especialmente provenientes
de fontes renov?veis, no sistema brasileiro tende a se torna
r a cada ano mais comum. En-
tretanto, esta nova configura??o do sistema traz novos desafi
os concernentes ao controle,
opera??o e prote??o. Um dos principais problemas da gera??o
distribu?da nos sistemas de
prote??o ? a forma??o de ilhamentos, que pode resultar em ris
cos de seguran?a ?s pessoas
e a rede de energia el?trica. Dentre as diversas t?cnicas de p
rote??o de ilhamentos, as
t?cnicas passivas destacam-se devido ao custo de implement
a??o e simplicidade, sendo
necess?rias apenas medi??es de tens?o e corrente para detec
??o de problemas no sistema.
Prop?e-se neste trabalho um sistema de prote??o baseado na t
ransformada
wavelet
com
as fun??es de sobrecorrente, sub/sobretens?es e informa??
es dos transit?rios de falta para
r?pida detec??o e identifica??o de situa??es de falta no sist
ema. O esquema de prote??o
proposto foi avaliado por meio de estudos de simula??o e expe
rimental, apresentando de-
sempenho similar aos m?todos de sobrecorrente e sub/sobret
ens?o convencionais, por?m,
com o adicional da detec??o do instante exato das faltas. / A typical electrical power system is characterized by centr
alization of power gene-
ration. However, with the restructuring of the electric sys
tem, this topology is changing
with the insertion of generators in parallel with the distri
bution system (distributed gene-
ration) that provides several benefits to be located near to e
nergy consumers. Therefore,
the integration of distributed generators, especially fro
m renewable sources in the Brazi-
lian system has been common every year. However, this new sys
tem topology may result
in new challenges in the field of the power system control, ope
ration, and protection.
One of the main problems related to the distributed generati
on is the islanding formation,
witch can result in safety risk to the people and to the power g
rid. Among the several
islanding protection techniques, passive techniques have
low implementation cost and
simplicity, requiring only voltage and current measuremen
ts to detect system problems.
This paper proposes a protection system based on the wavelet
transform with overcur-
rent and under/overvoltage functions as well as infomation
of fault-induced transients in
order to provide a fast detection and identification of fault
s in the system. The propo-
sed protection scheme was evaluated through simulation and
experimental studies, with
performance similar to the overcurrent and under/overvolt
age conventional methods, but
with the additional detection of the exact moment of the fault.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20243 |
| Date | 22 June 2015 |
| Creators | Paiva, S?mara de Cavalcante |
| Contributors | 03168934470, http://lattes.cnpq.br/7510091283933216, Silveira, Luiz Felipe de Queiroz, 02863206494, http://lattes.cnpq.br/4139452169580807, Almeida, Marcos Antonio Dias de, 10611975491, http://lattes.cnpq.br/5323110802158816, Pimentel Filho, Max Chianca, 66368430478, http://lattes.cnpq.br/0466613101201324, Costa, Fl?vio Bezerra |
| Publisher | Universidade Federal do Rio Grande do Norte, 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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