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According to IEEE Standard 1547, DGs must be automatically
disconnected from the electric power system in the event of faults [7]-[8]. Hence,
DGs will be disconnected faster than the protectivedevice from the faulted circuit
using stable islanding method [9]. But this solution would work effectively if the
penetration of DGs in the distribution system is low. When the penetration of DG
ishigh, the above technique would reduce reliability as well as the expected
benefits of DG. Therefore, by avoiding unnecessary disconnection of DG,
benefits of DG can be maximized (Bhalja,2011).Reference [13] analyzes part of an actual distribution system
to identify some more potential cases of malcoordination that
depend on size and placement of DG in system. It concludes
that, ingeneral, if protection scheme is not changed, the only
way to maintain coordination in presence of arbitrary DG
penetration is to disconnect all DG instantaneously in case of
fault. This would enable thesystem to regain its radial nature
and coordination would withhold. But this would mean that
DG is disconnected even for temporary faults (Brahma, 2004).

[13] S. M. Brahma and A. A. Girgis,“Impact of distributed generation on
fuse and relay coordination: analysis and remedies,” in Proc. Int. Assoc.
Sci. Technol. Develop., Clearwater, FL, 2001, pp. 384–389.


Reference [14] discusses thissituation in
detail and concludes that the coordination in the presence of DG
can be achieved with microprocessor-based reclosers available
in the market. This recloser has to be made directionaltoward
the downstream side of feeder. But in this case too, all DG downstream of the recloser has to be disconnected before the first reclose
takes place to avoid connection without synchronism(Brahma, 2004).

[14] S. M. Brahma and A. A. Girgis, “Microprocessor-based reclosing to coordinate fuse and recloser
in a system with high penetration of distributed generation,” in Proc.
IEEE...
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