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

Jundi Jia; Guangya Yang; Arne Hejde Nielsen

doi:10.3390/en11071660

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 language	English
Article number	1660
Journal	Energies
Volume	11
Issue number	7
Number of pages	17
ISSN	1996-1073
DOIs	https://doi.org/10.3390/en11071660
Publication status	Published - 2018

Keywords

Converter
Fault analysis
Grid codes
Short circuit current
Unbalanced faults

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Energies 11 01660Final published version, 9.09 MB

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title = "Fault Analysis Method Considering Dual-Sequence Current Control of VSCs under Unbalanced Faults",

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",

author = "Jundi Jia and Guangya Yang and Nielsen, {Arne Hejde}",

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issn = "1996-1073",

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TY - JOUR

T1 - Fault Analysis Method Considering Dual-Sequence Current Control of VSCs under Unbalanced Faults

AU - Jia, Jundi

AU - Yang, Guangya

AU - Nielsen, Arne Hejde

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - Converter

KW - Fault analysis

KW - Grid codes

KW - Short circuit current

KW - Unbalanced faults

U2 - 10.3390/en11071660

DO - 10.3390/en11071660

M3 - Journal article

SN - 1996-1073

VL - 11

JO - Energies

JF - Energies

IS - 7

M1 - 1660

ER -

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

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