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Abstract:
A novel approach with active grounding is proposed to solve the problems of ground fault arc extinguishing and line detection for distribution networks. The single-phase cascaded H-bridge multi-level converter is connected to the neutral point in distribution networks directly. When the single phase ground fault occurs, a compensating current is injected to neutral point by multi-level converter, fully compensating the fault current and controlling the fault phase voltage to zero, thus extinguishing the fault arc. After a certain delay, the ground fault judgment is executed when the compensating current is reduced to zero. If permanent ground fault is determined, the line detection is carried out to identify fault line according to changes of compensating current and zero-sequence current before and after the multi-level converter exiting. The theoretical analysis and simulation results show that this method has the advantages of clear principle, easy implementation and good feasibility. ©, 2015, Power System Technology Press. All right reserved.
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Power System Technology
ISSN: 1000-3673
CN: 11-2410/TM
Year: 2015
Issue: 9
Volume: 39
Page: 2677-2674
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count: 45
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 4
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