A unidirectional DC-DC autotransformer for DC grid application

Meng Zhou, Wang Xiang, Wenping Zuo, Weixing Lin, Jinyu Wen

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Abstract

Conventional unidirectional DC-DC converters for DC grid application employ DC-AC-DC two-stage conversion technology and suffer from high converter cost and power loss. To solve these issues, a unidirectional step-up DC-DC autotransformer (UUDAT) and a unidirectional step-down DC-DC autotransformer (DUDAT) are studied. The UUDAT and DUDAT are composed of a series connection of diode bridges and voltage source converters. Topologies of UUDAT and DUDAT are detailed. The harmonic and un-controllability issues are discussed. Control and possible application scenarios for UUDAT and DUDAT are depicted. DC fault isolation mechanism and the methods of dimensioning the voltage and power ratings of the components in UUDAT and DUDAT are studied. Extensive simulations on power system level and experiments on a UUDAT and DUDAT prototype verified their technical feasibility.

Original languageEnglish
Article number530
Number of pages16
JournalEnergies
Volume11
Issue number3
DOIs
Publication statusPublished - 1 Mar 2018

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Keywords

  • DC power systems
  • DC power transmission
  • DC-DC power conversion
  • HVDC circuit creakers
  • HVDC transmission

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