Electronically controlled capacitive energy storage element for DC grids

Mario Zaja (Corresponding Author), Dragan Jovcic (Corresponding Author)

Research output: Contribution to journalArticle

Abstract

A major and very important challenge in dc grid development is maintaining continuous converter operation under dc faults. This paper proposes a novel capacitive energy storage device which improves security of dc grids by avoiding terminal blocking. The device provides current from the capacitor bank during dc faults, reducing fault current contribution and voltage drop of dc grid converters. Moreover, the device also helps in balancing pole voltages which is of particular significance during pole-to-ground faults in symmetrical monopole systems. Other benefits like improved transient grid stability are also demonstrated. Device’s design and performance is assessed using theoretical analysis and verified on a three-terminal offshore dc grid model in PSCAD. The cost of the device’s electronics is minimized and the total cost and weight estimation are also shown.
Original languageEnglish
Pages (from-to)129-138
Number of pages10
JournalInternational Journal of Power and Energy Systems
Volume113
Early online date21 May 2019
DOIs
Publication statusE-pub ahead of print - 21 May 2019

Fingerprint

Energy Storage
Energy storage
Poles
Grid
Fault
Electric fault currents
Costs
Capacitors
Electronic equipment
Converter
Pole
Voltage
Electric potential
Monopole
Capacitor
Balancing
Theoretical Analysis
Electronics
Voltage drop

Keywords

  • Energy storage
  • Dc grid protection
  • MMC
  • VSC
  • CONVERTERS
  • SYSTEM
  • FAULTS

Cite this

Electronically controlled capacitive energy storage element for DC grids. / Zaja, Mario (Corresponding Author); Jovcic, Dragan (Corresponding Author).

In: International Journal of Power and Energy Systems, Vol. 113, 01.12.2019, p. 129-138.

Research output: Contribution to journalArticle

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