A Carrier-based Two-Phase-Clamped DPWM Strategy With Zero-Sequence Voltage Injection for Three-Phase Quasi-Two-Stage Buck-Type Rectifiers

Junzhong Xu, Thiago B. Soeiro, Yang Wu, Fei Gao, Yong Wang, Houjun Tang, Pavol Bauer

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A three-phase buck-type rectifier features a step-down ac-dc conversion function, which is considered as a prominent solution for electric vehicle chargers and telecommunication systems integrated to the grid above 380 V line to line. However, traditional solutions for those applications employ cascaded architectures with an ac-dc boost-type stage and a dc-dc buck-type stage, which may suffer from high switching losses and large dc-link capacitor volume. To relieve this issue, a straightforward carrier-based two-phase-clamped discontinuous pulsewidth modulation (DPWM) strategy with generalized zero-sequence voltage injection is proposed in this article for the commonly employed cascaded circuit. This method can stop the switching actions in the front-end stage during two-third of the grid period, which can yield to the best switching loss reduction. The operations of the front- and back-end converter stages become highly coupled to each other, which reduces the size requirement of the capacitor in the dc link. Therefore, the equivalent circuit behaves as a quasi-two-stage buck-type rectifier allowing an enhancement of the system power density by improving power conversion efficiency and by reducing the volume of passive components and heat sink. The proposed carrier-based two-phase-clamped DPWM strategy is described, analyzed, validated, and compared with different pulsewidth modulation methods on PLECS-based simulation and a 5-kW prototype.

Original languageEnglish
Pages (from-to)5196-5211
Number of pages16
JournalIEEE Transactions on Power Electronics
Volume37
Issue number5
DOIs
Publication statusPublished - 2022

Keywords

  • buck-type rectifier
  • Capacitors
  • Carrier-based
  • discontinuous pulsewidth modulation (DPWM)
  • Phase modulation
  • Pulse width modulation
  • Switches
  • Switching loss
  • Voltage
  • Voltage control
  • zero-sequence voltage injection

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