Fault Analysis Method Considering Dual-Sequence Current Control of VSCs under Unbalanced Faults

Jundi Jia, Guangya Yang*, Arne Hejde Nielsen

*Corresponding author for this work

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Abstract

Voltage source converters (VSCs) are able to provide both positive- and negative-sequence short circuit currents under unbalanced faults. Their short circuit responses can be significantly different from those of conventional synchronous generators. This paper developed a static fault analysis method by considering dual-sequence current control of VSCs under unbalanced faults where VSCs are treated as voltage-dependent current sources in both positive- and negative-sequence networks. Since the control strategy of VSCs varies, flexible parameters are included in the model to reflect their diverse short circuit behaviours. The proposed method is verified through a modified IEEE 9-bus system and a simplified western Danish power system with real time simulations. This analytical method can be used to help understand and evaluate the impact of dual-sequence current control of VSCs on future converter-dominated power systems.
Original languageEnglish
Article number1660
JournalEnergies
Volume11
Issue number7
Number of pages17
ISSN1996-1073
DOIs
Publication statusPublished - 2018

Keywords

  • Converter
  • Fault analysis
  • Grid codes
  • Short circuit current
  • Unbalanced faults

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