Tesis
Proposta de um sistema de proteção para preservar a coordenação entre religadores e elos fusíveis de sistemas de distribuição na presença de geração distribuída
Fecha
2013-08-11Registro en:
GUTIERRES, Luiz Fernando de Freitas. Proposal of a recloser-fuse coordination protection for
distributed generation systems. 2013. 101 f. Dissertação (Mestrado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2013.
Autor
Gutierres, Luiz Fernando de Freitas
Institución
Resumen
This work presents a novel recloser-fuse coordination protection for distributed generation
systems based on the use of RMS current comparators. In real-time, these comparators are
responsible for analyzing current magnitude in upstream and downstream network directions;
identify faults; and assess the recloser-fuse coordination status based on critical margins identified
by the protection system. Once a miscoordination is detected, some distributed generation
units are strategically disconnected from the distribution network by gate turn-off thyristors.
As a result of this action, short-circuit current is reduced to a satisfactory level, restoring the
coordination between recloser and fuses in the grid. The proposed protection system has been
implemented in a 12.47-kV grid and simulations have been carried out in ATP/EMTP. The main
contributions in this work are the results obtained mainly throughout testing fault circumstances
and operational conditions. Besides, this work proposes a protection methodology in the perspective
of a national standardized regulation. Significantly, the approach contributes to the
adequacy and modernization of distribution systems with considerable tendency of distributed
generation insertion.