Impact of wind power plant reactive current injection during asymmetrical grid faults

Ömer Göksu, Remus Teodorescu, Claus Leth Bak, Florin Iov, Philip Carne Kjær

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

18 Citationer (Scopus)

Resumé

As more renewable energy sources, especially more wind turbines (WTs) are installed in the power system; grid codes for wind power integration are being generated to sustain stable power system operation with non-synchronous generation. Common to most of the grid codes, wind power plants (WPPs) are requested to stay connected and inject positive-sequence reactive current in order to boost positive-sequence grid voltage during short-circuit grid faults, irrespective of the fault type; symmetrical or asymmetrical. However, as shown in this study, when WPPs inject pure positive-sequence reactive current in case of asymmetrical faults, as a conventional method (CM) in accordance with the grid code requirement, positive-sequence grid voltage is boosted, but also higher negative sequence voltage in the grid and higher overvoltages at the non-faulty phases occur. In this study, an alternative injection method, where WTs are injecting both positive and negative sequence currents during asymmetrical faults, providing improved grid support, is given and compared with the CM. In addition, effect of coupling between positive, negative and zero sequences when WPPs are injecting currents during asymmetrical faults, is investigated, which was not considered in the wind power impact studies before.
OriginalsprogEngelsk
TidsskriftIET Renewable Power Generation
Vol/bind7
Udgave nummer5
Sider (fra-til)484-492
Antal sider9
ISSN1752-1416
DOI
StatusUdgivet - sep. 2013

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Wind power
Power plants
Wind turbines
Electric potential
Short circuit currents

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title = "Impact of wind power plant reactive current injection during asymmetrical grid faults",
abstract = "As more renewable energy sources, especially more wind turbines (WTs) are installed in the power system; grid codes for wind power integration are being generated to sustain stable power system operation with non-synchronous generation. Common to most of the grid codes, wind power plants (WPPs) are requested to stay connected and inject positive-sequence reactive current in order to boost positive-sequence grid voltage during short-circuit grid faults, irrespective of the fault type; symmetrical or asymmetrical. However, as shown in this study, when WPPs inject pure positive-sequence reactive current in case of asymmetrical faults, as a conventional method (CM) in accordance with the grid code requirement, positive-sequence grid voltage is boosted, but also higher negative sequence voltage in the grid and higher overvoltages at the non-faulty phases occur. In this study, an alternative injection method, where WTs are injecting both positive and negative sequence currents during asymmetrical faults, providing improved grid support, is given and compared with the CM. In addition, effect of coupling between positive, negative and zero sequences when WPPs are injecting currents during asymmetrical faults, is investigated, which was not considered in the wind power impact studies before.",
author = "{\"O}mer G{\"o}ksu and Remus Teodorescu and Bak, {Claus Leth} and Florin Iov and {Carne Kj{\ae}r}, Philip",
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Impact of wind power plant reactive current injection during asymmetrical grid faults. / Göksu, Ömer; Teodorescu, Remus; Bak, Claus Leth; Iov, Florin; Carne Kjær, Philip.

I: IET Renewable Power Generation, Bind 7, Nr. 5, 09.2013, s. 484-492 .

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Impact of wind power plant reactive current injection during asymmetrical grid faults

AU - Göksu, Ömer

AU - Teodorescu, Remus

AU - Bak, Claus Leth

AU - Iov, Florin

AU - Carne Kjær, Philip

PY - 2013/9

Y1 - 2013/9

N2 - As more renewable energy sources, especially more wind turbines (WTs) are installed in the power system; grid codes for wind power integration are being generated to sustain stable power system operation with non-synchronous generation. Common to most of the grid codes, wind power plants (WPPs) are requested to stay connected and inject positive-sequence reactive current in order to boost positive-sequence grid voltage during short-circuit grid faults, irrespective of the fault type; symmetrical or asymmetrical. However, as shown in this study, when WPPs inject pure positive-sequence reactive current in case of asymmetrical faults, as a conventional method (CM) in accordance with the grid code requirement, positive-sequence grid voltage is boosted, but also higher negative sequence voltage in the grid and higher overvoltages at the non-faulty phases occur. In this study, an alternative injection method, where WTs are injecting both positive and negative sequence currents during asymmetrical faults, providing improved grid support, is given and compared with the CM. In addition, effect of coupling between positive, negative and zero sequences when WPPs are injecting currents during asymmetrical faults, is investigated, which was not considered in the wind power impact studies before.

AB - As more renewable energy sources, especially more wind turbines (WTs) are installed in the power system; grid codes for wind power integration are being generated to sustain stable power system operation with non-synchronous generation. Common to most of the grid codes, wind power plants (WPPs) are requested to stay connected and inject positive-sequence reactive current in order to boost positive-sequence grid voltage during short-circuit grid faults, irrespective of the fault type; symmetrical or asymmetrical. However, as shown in this study, when WPPs inject pure positive-sequence reactive current in case of asymmetrical faults, as a conventional method (CM) in accordance with the grid code requirement, positive-sequence grid voltage is boosted, but also higher negative sequence voltage in the grid and higher overvoltages at the non-faulty phases occur. In this study, an alternative injection method, where WTs are injecting both positive and negative sequence currents during asymmetrical faults, providing improved grid support, is given and compared with the CM. In addition, effect of coupling between positive, negative and zero sequences when WPPs are injecting currents during asymmetrical faults, is investigated, which was not considered in the wind power impact studies before.

U2 - 10.1049/iet-rpg.2012.0255

DO - 10.1049/iet-rpg.2012.0255

M3 - Journal article

VL - 7

SP - 484

EP - 492

JO - IET Renewable Power Generation

JF - IET Renewable Power Generation

SN - 1752-1416

IS - 5

ER -