Zero-sequence manipulation to maintain correct operation of NPC-PFC rectifier upon neutral line disconnection and reconnection

Natan Schechter, Alon Kuperman

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In this paper, the reason for operational instability occurring upon neutral line disconnection and reconnection of active three-phase three-level neutral-point-clamped power factor correction rectifiers is revealed and simple solution allowing to maintain correct operation is proposed. It is shown that the neutral line disconnection/reconnection inverts the sign of the partial dc-link voltages balancing loop; thus, reversing the sign of zero-sequence component created by the balancing loop controller would eliminate the mentioned drawback by keeping the balancing loop negative feedback. The proposed finding is experimentally verified on a commercial 25-kVA NPC-PFC front end.

Original languageEnglish
Article number7514943
Pages (from-to)866-872
Number of pages7
JournalIEEE Transactions on Industrial Electronics
Volume64
Issue number1
DOIs
StatePublished - 1 Jan 2017

Keywords

  • Active rectifier
  • power factor correction (PFC)
  • three-level converter

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