Effective Voltage Balance Control for Bipolar-DC-Bus-Fed EV Charging Station with Three-Level DC-DC Fast Charger

Longcheng Tan, Bin Wu, Venkata Yaramasu, Sebastian Rivera, Xiaoqiang Guo

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

The development of high-power charging stations with fast chargers is a promising solution to shorten the charging time for electric vehicles (EVs). The neutral-point-clamped (NPC) converter-based bipolar-dc-bus-fed charging station brings many merits, but it has inherent voltage balance limits. To solve this issue, a voltage balance control (VBC) method based on a new modulation together with three-level (TL) dc-dc converter-based fast charger is proposed. Additionally, an effective VBC coordination between the TL dc-dc converter and the NPC converter is formulated. Through the proposed VBC coordination, the controllable balancing region is extended so that additional balancing circuits are eliminated. Meanwhile, the quality of the grid-side currents is improved as the NPC converter has more freedom to control currents. The low-frequency voltage fluctuations in dc buses are removed because the TL dc-dc converter performs most of the balancing tasks. Faster VBC perturbation performance is achieved due to higher available balancing current at TL dc-dc converter side. In addition, the voltage balance limits of both the TL dc-dc converter and the NPC converter are explored. The voltage balancing performances are compared when VBC is located at different sides. Simulation and experimental results are provided to verify the proposed VBC and the VBC coordination.

Original languageEnglish
Article number7428939
Pages (from-to)4031-4041
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume63
Issue number7
DOIs
StatePublished - Jul 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 IEEE.

Keywords

  • Electric vehicles
  • fast charger
  • NPC converter
  • three-level DC-DC converter
  • voltage balance control

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