Energies (Sep 2023)

A Bidirectional Grid-Tied ZVS Three-Phase Converter Based on DPWM and Digital Control

  • Yi-Hung Liao,
  • Faa-Jeng Lin,
  • Ying Zhou,
  • Wei-Rong Lai,
  • Xuan-Sheng Huang

DOI
https://doi.org/10.3390/en16186453
Journal volume & issue
Vol. 16, no. 18
p. 6453

Abstract

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In this paper, a bidirectional grid-tied ZVS three-phase converter is proposed. The circuit operation principle in both the rectifier and inverter modes was analyzed. The proposed topology could achieve zero-voltage switching in the six main switches and the auxiliary switch both in the rectifier mode and inverter mode. In addition, the reverse recovery current of body diodes in the main switches was also suppressed. Furthermore, in order to realize the ZVS control scheme under the grid-tied bidirectional power flow condition and reduce the number of switchings, a modified carrier-based discontinuous PWM was proposed to fit the bidirectional switching sequence. Finally, a 3 kW prototype was constructed. Some simulation and experimental results are presented to verify the validity of the proposed circuit topology and PWM control scheme.

Keywords