Impact of controlling zero sequence current in a three-phase four-wire LV network with PV units

Fida Hasan Md Rafi, M. J. Hossain, Md Shamiur Rahman, J. Lu

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

7 Citations (Scopus)

Abstract

The dynamic impacts of controlling zero sequence current in a three-phase four-wire low voltage (LV) distribution network with a four-leg voltage source inverter (VSI) and PV installations are investigated in this paper. The PV VSI is designed to control active power at unity power factor (p.f) with additional neutral and zero sequence current controls. Inherently, most of the three-phase four-wire LV distribution networks exhibit voltage unbalance characteristics due to the connection of single- and three-phase nonlinear loads as well as occurrence of asymmetrical faults in the networks. The control over zero sequence current can improve the inherent voltage unbalance in the LV networks. The transient characteristics of the unbalanced network are investigated utilizing a widely used software environment, PSCAD/EMTDC, for the Energex 11 kV/420 V distribution network in Brisbane, Australia. The performance of the designed four-leg VSI is compared with the traditional three-leg VSI experiencing different asymmetrical faults. The results show that, with the additional degree of freedom from the four-leg VSI, faster fault recovery and lower MVA requirement can be achieved for unbalanced LV networks.

Original languageEnglish
Title of host publicationPESGM 2016 : IEEE Power and Energy Society General Meeting : proceedings
Place of PublicationBoston
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1-5
Number of pages5
Volume2016-November
ISBN (Electronic)9781509041688
DOIs
Publication statusPublished - 10 Nov 2016
Externally publishedYes
Event2016 IEEE Power and Energy Society General Meeting, PESGM 2016 - Boston, United States
Duration: 17 Jul 201621 Jul 2016

Other

Other2016 IEEE Power and Energy Society General Meeting, PESGM 2016
CountryUnited States
CityBoston
Period17/07/1621/07/16

Keywords

  • Four-leg inverter
  • Neutral current
  • Three-phase four-wire LV network
  • Voltage unbalance
  • Zero sequence component

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