masterThesis
Proteção em sistemas elétricos com geração distribuída utilizando a transformada wavelet
Fecha
2015-06-22Registro en:
PAIVA, Sâmara de Cavalcante. Proteção em sistemas elétricos com geração distribuída utilizando a transformada wavelet. 2015. 110f. Dissertação (Mestrado em Engenharia Elétrica e de Computação) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2015.
Autor
Paiva, Sâmara de Cavalcante
Resumen
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.