A DC autotransformer design for medium and high voltage DC transmission systems

Azmy Gowaid, G. P. Adam, A. M. Massoud, Shehab Ahmed, Barry Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


This paper studies a dc-dc converter topology dual to the ac autotransformer for medium and high voltage dc-dc conversion. Operation with trapezoidal modulation is analyzed where the dc autotransformer is built of transition-arm bridges. This structure features less power electronics installation and energy storage capacity as compared to counterparts operating in sinusoidal modulation. It also permits the use of low-loss devices such as thyristors or Insulated Gate Commutated Thyristors (IGCTs), promising high efficiency. The paper investigates this topology in steady state as well as DC fault blocking capability.
Original languageEnglish
Title of host publication2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2018)
Number of pages6
Publication statusPublished - 7 Jun 2018


  • autotransformers
  • bridge circuits
  • DC-DC power convertors
  • HVDC power convertors
  • HVDC power transmission
  • power transmission faults
  • trapezoidal modulation
  • transition-arm bridges
  • power electronics installation
  • energy storage capacity
  • DC fault blocking capability
  • DC autotransformer design
  • high voltage DC transmission systems
  • AC autotransformer
  • low-loss devices
  • high voltage DC-DC conversion
  • DC-DC converter topology
  • Bridge circuits
  • DC-DC power converters
  • High-voltage techniques
  • Energy storage
  • Power transformers
  • windings
  • topology
  • Modular multilevel converter
  • DC transformer
  • dual active bridge
  • DC-DC power conversion


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