DC bus strength in DC grid protection

Mario Zaja, Dragan Jovcic, Masood Hajian

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

3 Citations (Scopus)


Fast detection and isolation of DC faults is recognized as the main challenge in developing DC transmission grids. Voltage source converter blocking must be prevented which can be very difficult given the large rate-of-rise of fault currents. The concept of multi-converter DC bus is introduced as a grid design approach aimed towards increasing robustness of DC grids to DC faults. Behavior of a multi-converter DC bus under DC fault conditions is analyzed using newly defined parameters such as peak fault current increase and bus voltage drop. Critical inductor size and critical fault neutralization time are studied and their implications discussed. The impact of converter rating on fault current sharing and voltage drop on a multi-converter bus is investigated. Theoretical studies are substantiated by simulation results using a 10-converter bus model in PSCAD.

Original languageEnglish
Title of host publication19th International Symposium on Power Electronics, Ee 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781538635025, 9781538635018
ISBN (Print)9781538635032
Publication statusPublished - 8 Dec 2017
Event19th International Symposium on Power Electronics, Ee 2017 - Novi Sad, Serbia
Duration: 19 Oct 201721 Oct 2017


Conference19th International Symposium on Power Electronics, Ee 2017
CityNovi Sad
OtherSymposium will be held at Novi Sad, on 23th to 26th October, 2019, in the Central Building of the University of Novi Sad, Novi Sad, Republic of Serbia.


  • DC grid protection
  • fault current sharing
  • MMC
  • multi-converter DC bus
  • VSC


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