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Single-phase inverter-based neutral-current suppressor for attenuating neutral current of three-phase four-wire distribution power system

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4 Author(s)
Wu, J.-C. ; Dept. of Microelectron. Eng., Nat. Kaohsiung Marine Univ., Kaohsiung, Taiwan ; Jou, H.-L. ; Wu, K.-D. ; Xiao, S.-T.

In this study, a neutral-current suppressor is proposed. The proposed neutral-current suppressor comprises a zero-sequence transformer, a single-phase power converter and a rectifier. The proposed zero-sequence transformer is implemented by only two single-phase transformers, which are connected to three-phase lines of the three-phase four-wire distribution power system to supply a zero-sequence current path. The single-phase power converter is connected between the zero-sequence transformer and neutral line. A rectifier with small power rating is connected to the DC bus of single-phase power converter for overcoming the power loss of single-phase power converter to sustain a constant DC voltage. The performance of neutral-current suppression for the zero-sequence transformer is advanced by controlling the single-phase power converter so as to make the neutral load current flow through the proposed neutral-current suppressor. Moreover, the proposed neutral-current suppressor can also avoid the neutral current caused by the unbalanced voltage of three-phase four-wire distribution power systems. Hence, the proposed neutral-current suppressor is an effective solution to the neutral-current problem of three-phase four-wire distribution power systems. Both computer simulation and experimental results verify that the proposed neutral-current suppressor can achieve the expected performance.

Published in:

Generation, Transmission & Distribution, IET  (Volume:6 ,  Issue: 6 )