Title :
Single-phase inverter-based neutral-current suppressor for attenuating neutral current of three-phase four-wire distribution power system
Author :
Wu, Jinn-Chang ; Jou, Hurng-Liahng ; Wu, Kuen-Der ; Xiao, Shun-Tian
Author_Institution :
Dept. of Microelectron. Eng., Nat. Kaohsiung Marine Univ., Kaohsiung, Taiwan
fDate :
6/1/2012 12:00:00 AM
Abstract :
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.
Keywords :
invertors; power distribution lines; DC bus; computer simulation; constant DC voltage; neutral current attenuation; neutral line; neutral load current; power loss; rectifier; single-phase inverter-based neutral-current suppressor; single-phase power converter; single-phase transformers; three-phase four-wire distribution power system; three-phase lines; zero-sequence current path; zero-sequence transformer;
Journal_Title :
Generation, Transmission & Distribution, IET
DOI :
10.1049/iet-gtd.2011.0125