Optimal Neutral-Point Voltage Balancing Algorithm for Three-Phase Three-Level Converters with Hybrid Zero-Sequence Signal Injection and Virtual Zero-Level Modulation

Jun Wang, Xibo Yuan, Kfir J. Dagan, Andrew Bloor

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

This article presents an optimal carrier-based voltage balancing scheme for three-phase three-level converters. The proposed scheme utilizes two available degrees of freedom, i.e., zero-sequence signal injection and virtual zero-level modulation (VZM), to eliminate the low-frequency neutral-point voltage oscillation. It is universally effective over the full power factor and modulation index range and easy to implement in digital controllers. The hybrid algorithm combines the merits of both approaches, which offers the optimal performance regarding controllability, switching device power losses, and output harmonics. The main drawbacks of VZM, i.e., the increased switching loss and high-frequency harmonics due to additional switching transitions, have been minimized in the proposed scheme. The performance of the proposed scheme is evaluated through simulation and experiment.

Original languageEnglish
Article number9052463
Pages (from-to)3865-3878
Number of pages14
JournalIEEE Transactions on Industry Applications
Volume56
Issue number4
DOIs
StatePublished - 1 Jul 2020
Externally publishedYes

Keywords

  • DC-AC power converters
  • pulsewidth modula-tion
  • three-level converters
  • voltage balancing

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