A Simple Zero-Sequence Voltage Injection Method for Carrier-Based Pulsewidth Modulation of the Three-Level NPC Inverter

Fa Chen, Wei Qiao, Hongmei Wang, Liyan Qu

Research output: Contribution to journalArticlepeer-review

Abstract

This article proposes a simple zero-sequence voltagei injection method for the carrier-based pulsewidth modulation (CBPWM) of the three-level neutral-point-clamped (NPC) inverter. The injected zero-sequence voltage signal is simply determined by comparing the three reference voltage signals and the dc-link capacitor voltages, respectively. Theoretical analyses show that the CBPWM with the proposed method can balance the dc-link capacitor voltages and eliminate/reduce the ripples of the dc-link capacitor voltages of the NPC inverter. Compared with other CBPWM schemes, the CBPWM with the proposed method has lower computation cost, does not need the information of the three-phase currents, and can reduce the switching loss of the NPC inverter. The CBPWM with the proposed zero-sequence voltage injection method and its superiority is validated experimentally in comparison with existing CBPWM schemes. The proposed method works in both inverter and rectifier modes, which is validated by simulation results.

Original languageEnglish (US)
Article number9151962
Pages (from-to)4687-4699
Number of pages13
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume9
Issue number4
DOIs
StatePublished - Aug 2021

Keywords

  • Carrier-based pulsewidth modulation (CBPWM)
  • neutral-point-clamped (NPC) inverter
  • three-level inverter
  • voltage balance
  • zero-sequence voltage injection

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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