A transient and non-unit-based protection technique for DC grids based on the rate-of-change (R-o-C) of the fault induced travelling wave components

Monday Ikhide, Sarath Tennakoon, Hengxu Ha, Alison Griffiths, Sankara Subramanian, Andrzej Adamczyk

Research output: Contribution to journalArticle

Abstract

This paper presents a transient and non-unit-based protection scheme for consideration in DC grids of the future. The
technique utilises the rate-of-change (R-o-C) of the associated travelling wave components following the occurrence of
a fault to determine whether the fault is internal or external. For an internal fault, the product of the magnitude of the Ro-
C of the fault induced voltage and current travelling wave following fault inception must exceed a predetermined
setting, otherwise the fault is external. The DC inductor located at the cable ends provides attenuation for the high
frequency contents resulting from an external fault. The ratio between the forward voltage travelling waves and the
backward voltage travelling wave provides directional discrimination. This ratio is less than unity for a forward
directional fault and greater than unity for reverse directional faults. The protection algorithm has been validated using
PSCAD/EMTDC simulations based on full scale modular multilevel converter (MMC) - based HVDC grid. The
simulation results presented, including the performances indices compared to existing and proposed methods
available in literature shows the suitability and reliability of the proposed technique in distinguishing between internal
and external faults. Key advantages of the proposed technique is that it simple, easily implemented, and does not rely
on complex signal processing technique; and therefore it can easily be implemented to provide autonomous tripping
for all relays located on the DC grid
LanguageEnglish
Article numberSEGAN_2018_394
Pages(In-Press)
Number of pages25
JournalSustainable Energy, Grids and Networks
Volume(In-Press)
Early online date14 Feb 2019
StateE-pub ahead of print - 14 Feb 2019

Fingerprint

Electric potential
Signal processing
Cables

Keywords

  • DC grid protection
  • internal and external fault
  • transient based protection
  • fault induced travelling wave
  • rate-of-change (R-o-C) of travelling wave

ASJC Scopus subject areas

  • Engineering(all)
  • Energy(all)

Cite this

A transient and non-unit-based protection technique for DC grids based on the rate-of-change (R-o-C) of the fault induced travelling wave components. / Ikhide, Monday; Tennakoon, Sarath; Ha, Hengxu; Griffiths, Alison; Subramanian, Sankara; Adamczyk, Andrzej.

In: Sustainable Energy, Grids and Networks, Vol. (In-Press), SEGAN_2018_394, 14.02.2019, p. (In-Press).

Research output: Contribution to journalArticle

Ikhide, Monday ; Tennakoon, Sarath ; Ha, Hengxu ; Griffiths, Alison ; Subramanian, Sankara ; Adamczyk, Andrzej. / A transient and non-unit-based protection technique for DC grids based on the rate-of-change (R-o-C) of the fault induced travelling wave components. In: Sustainable Energy, Grids and Networks. 2019 ; Vol. (In-Press). pp. (In-Press)
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