New breed of network fault-tolerant voltage-source-converter HVDC transmission system

Grain Philip Adam, Khaled Ahmed, Stephen Finney, Keith Bell, Barry Williams

Research output: Contribution to journalArticlepeer-review

192 Citations (Scopus)


This paper proposes a new breed of high-voltage dc (HVDC) transmission systems based on a hybrid multilevel voltage source converter (VSC) with ac-side cascaded H-bridge cells. The proposed HVDC system offers the operational flexibility of VSC-based systems in terms of active and reactive power control, black-start capability, in addition to improved ac fault ride-through capability and the unique feature of current-limiting capability during dc side faults. Additionally, it offers features such as smaller footprint and a larger active and reactive power capability curve than existing VSC-based HVDC systems, including those using modular multilevel converters. To illustrate the feasibility of the proposed HVDC system, this paper assesses its dynamic performance during steady-state and network alterations, including its response to ac and dc side faults.
Original languageEnglish
Pages (from-to)335 - 346
Number of pages12
JournalIEEE Transactions on Power Systems
Issue number1
Early online date3 Jul 2012
Publication statusPublished - Feb 2013


  • capacitors
  • circuit faults
  • HVDC transmission
  • power conversion
  • voltage control
  • hybrid multilevel converter with ac side cascaded H-bride cells


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