Exploring an impedance-based SCR for accurate representation of grid-forming converters

Callum Henderson, Agusti Egea-Alvarez, Panagiotis Papadopoulos, Rui Li, Lie Xu, Ricardo Da Silva, Anthony Kinsella, Isaac Gutierrez, Razan Pabat-Stroe

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

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Abstract

The strength of an electrical network connection point is often characterized by the short circuit ratio. Analysis of the fault current contribution at the node can provide information on system impedance, voltage stability, maximum power transfer and system recovery time. However, the introduction of more power converter connected generation decreases the validity of the current short circuit ratio definition. Mainly, the parameters that determine the strength of a connection point cannot be inferred from the fault level contribution. This article presents a discussion on the pitfalls of quantifying the strength of an electrical network using fault current contribution. The limitations of the method for converter dominated networks are presented and alternative definitions from literature are discussed with drawbacks explored. Further considerations for a new index are described, and the article suggests utilizing system impedances for investigation of different stability components. Varying converter control algorithms are explored in terms of impedance, both grid-following and grid-forming. Grid-forming structures without a current loop were found to provide the greatest improvement in voltage stiffness.
Original languageEnglish
Title of host publication2022 IEEE Power and Energy Society General Meeting, PESGM 2022
Place of PublicationPiscataway, NJ
PublisherIEEE
Pages1-5
Number of pages5
ISBN (Electronic)9781665408233
ISBN (Print)9781665408240
DOIs
Publication statusPublished - 27 Oct 2022
Event2022 IEEE Power and Energy Society General Meeting - Denver, United States
Duration: 17 Jul 202221 Jul 2022

Publication series

NameIEEE Power and Energy Society General Meeting
Volume2022-July
ISSN (Print)1944-9925
ISSN (Electronic)1944-9933

Conference

Conference2022 IEEE Power and Energy Society General Meeting
Abbreviated titlePES GM 2022
Country/TerritoryUnited States
CityDenver
Period17/07/2221/07/22

Keywords

  • measurement
  • impedance measurement
  • stability criteria
  • power system stability
  • system recovery
  • circuit stability
  • converter impedance
  • SCR
  • grid forming converter

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