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

Jundi Jia, Guangya Yang and Arne Hejde Nielsen
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Jundi Jia: Center for Electric Power and Energy, Technical University of Denmark (DTU), 2800 Kgs. Lyngby, Denmark
Guangya Yang: Center for Electric Power and Energy, Technical University of Denmark (DTU), 2800 Kgs. Lyngby, Denmark
Arne Hejde Nielsen: Center for Electric Power and Energy, Technical University of Denmark (DTU), 2800 Kgs. Lyngby, Denmark

Energies, 2018, vol. 11, issue 7, 1-17

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.

Keywords: converter; fault analysis; grid codes; short circuit current; unbalanced faults (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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