Capacitive Element for Limiting VSC Fault Current in DC Grids

Mario Zaja, Dragan Jovcic, Masood Hajian

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

1 Citation (Scopus)

Abstract

Maintaining continuous voltage source converter operation under DC faults is one of main challenges in protection of DC transmission grids. In order to limit converter fault current below overcurrent tripping threshold (2-3 p.u.), impractically large inductors would be required in series with DC circuit breakers which would cause control-related issues. This paper proposes a novel shunt-connected protection device which, utilizing fault current sharing property of DC buses, reduces fault current contribution from the converter and improves DC bus voltage stability. Converter blocking can consequently be avoided with practically acceptable inductors. A case study is performed on a three-terminal offshore DC grid model developed in PSCAD. Peak fault current increase and bus voltage drop indicate greatly improved performance. Critical inductor size and critical fault neutralization time are analyzed for a range of protection system configurations and feasibility of such arrangements discussed.

Original languageEnglish
Title of host publication2018 IEEE Power and Energy Society General Meeting, PESGM 2018
PublisherIEEE Computer Society
Volume2018-August
ISBN (Electronic)9781538677032
DOIs
Publication statusPublished - 21 Dec 2018
Event2018 IEEE Power and Energy Society General Meeting, PESGM 2018 - Portland, United States
Duration: 5 Aug 201810 Aug 2018

Conference

Conference2018 IEEE Power and Energy Society General Meeting, PESGM 2018
CountryUnited States
CityPortland
Period5/08/1810/08/18

Keywords

  • DC fault
  • DC grid protection
  • Fault current limiting
  • MMC
  • VSC

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

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  • Cite this

    Zaja, M., Jovcic, D., & Hajian, M. (2018). Capacitive Element for Limiting VSC Fault Current in DC Grids. In 2018 IEEE Power and Energy Society General Meeting, PESGM 2018 (Vol. 2018-August). [8586339] IEEE Computer Society. https://doi.org/10.1109/PESGM.2018.8586339