Arc extinguishing of grounding faults is difficult for neutral non-effective grounding distribution networks.In traditional flexible arc-suppression method,the real-time measured source voltage is used to calculate the compensation current,which is injected by single active converter connected to the neutral point in distribution networks to compensate the fault current.Whereas,the zigzag transformer and the boosting transformer are used for converter to integrate into the power distribution network and faulty phase detection is necessary.In order to improve the above mentioned way,a novel method for earth-fault separate-phase flexible arc-suppression in distribution systems based on three-phase cascaded H-bridge converteris proposed in this paper.The three-phase cascaded H-bridge converters are connected to the distribution networks directly inductance.When a single-phase-to-ground fault occurred,the real-time measured phase voltage is used to calculate the compensation current.Then,the compensation current is injected by the three-phase cascaded H-bridge converter without the zigzag transformer and the boosting transformer.Therefore,the voltage of the fault phase is controlled to be zero and the fault arc is suppressed.The simulation verifies that the proposed principle is able to compensate the fault current flexibly and effectively,and restrain the restriking of earth-fault arc.Furthermore,faulty phase detection is unnecessary for single-phase or three-phase cascaded H-bridge converter to suppress the fault arc.
郭谋发,游建章,张伟骏,杨耿杰,缪希仁. 基于三相级联H桥变流器的配电网接地故障分相柔性消弧方法[J]. 电工技术学报, 2016, 31(17): 11-22.
Guo Moufa,You Jianzhang,Zhang Weijun, Yang Gengjie, Miao Xiren. Separate-Phase Flexible Arc-Suppression Method of Earth-Fault in Distribution Systems Based on Three-Phase Cascaded H-Bridge Converter. Transactions of China Electrotechnical Society, 2016, 31(17): 11-22.
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