Electric Vehicle Charging Station Using a Neutral Point Clamped Converter with Bipolar DC Bus

Sebastian Rivera, Bin Wu, Samir Kouro, Venkata Yaramasu, Jiacheng Wang

Research output: Contribution to journalArticlepeer-review

247 Scopus citations


This paper proposes a novel architecture for plug-in electric vehicles (PEVs) dc charging station at the megawatt level, through the use of a grid-tied neutral point clamped (NPC) converter. The proposed bipolar dc structure reduces the step-down effort on the dc-dc fast chargers. In addition, this paper proposes a balancing mechanism that allows handling any difference on the dc loads while keeping the midpoint voltage accurately regulated. By formally defining the unbalance operation limit, the proposed control scheme is able to provide complementary balancing capabilities by the use of an additional NPC leg acting as a bidirectional dc-dc stage, simulating the minimal load condition and allowing the modulator to keep the control on the dc voltages under any load scenario. The proposed solution enables fast charging for PEVs concentrating several charging units into a central grid-tied converter. In this paper, simulation and experimental results are presented to validate the proposed charging station architecture.

Original languageEnglish
Article number7055987
Pages (from-to)1999-2009
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number4
StatePublished - Apr 2015
Externally publishedYes

Bibliographical note

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  • Bipolar dc bus, fast charging
  • grid connection
  • neutral point clamped (NPC)
  • plug-in electric vehicles (PEVs)


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