Instability of Wind Turbine Converters during Current Injection to Low Voltage Grid Faults and PLL Frequency Based Stability Solution

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Resumé

In recent grid codes for wind power integration, wind turbines are required to stay connected during grid faults even when the grid voltage drops down to zero; and also to inject reactive current in proportion to the voltage drop. However, a physical fact, instability of grid-connected converters during current injection to very low (close to zero) voltage faults, has been omitted, i.e., failed to be noticed in the previous wind power studies and grid code revisions. In this paper, the instability of grid side converters of wind turbines defined as loss of synchronism (LOS), where the wind turbines lose synchronism with the grid fundamental frequency (e.g., 50 Hz) during very deep voltage sags, is explored with its theory, analyzed and a novel stability solution based on PLL frequency is proposed; and both are verified with power system simulations and by experiments on a grid-connected converter setup.
OriginalsprogEngelsk
TidsskriftI E E E Transactions on Power Systems
Vol/bind29
Udgave nummer4
Sider (fra-til)1683-1691
Antal sider9
ISSN0885-8950
DOI
StatusUdgivet - 9 jan. 2014

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Phase locked loops
Wind turbines
Wind power
Synchronization
Electric potential
Experiments
Voltage drop

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title = "Instability of Wind Turbine Converters during Current Injection to Low Voltage Grid Faults and PLL Frequency Based Stability Solution",
abstract = "In recent grid codes for wind power integration, wind turbines are required to stay connected during grid faults even when the grid voltage drops down to zero; and also to inject reactive current in proportion to the voltage drop. However, a physical fact, instability of grid-connected converters during current injection to very low (close to zero) voltage faults, has been omitted, i.e., failed to be noticed in the previous wind power studies and grid code revisions. In this paper, the instability of grid side converters of wind turbines defined as loss of synchronism (LOS), where the wind turbines lose synchronism with the grid fundamental frequency (e.g., 50 Hz) during very deep voltage sags, is explored with its theory, analyzed and a novel stability solution based on PLL frequency is proposed; and both are verified with power system simulations and by experiments on a grid-connected converter setup.",
keywords = "Converters, Current control, Power system faults, Power system stability, Wind power generation",
author = "{\"O}mer G{\"o}ksu and Remus Teodorescu and Bak, {Claus Leth} and Florin Iov and Kj{\ae}r, {Philip Carne}",
year = "2014",
month = "1",
day = "9",
doi = "10.1109/TPWRS.2013.2295261",
language = "English",
volume = "29",
pages = "1683--1691",
journal = "I E E E Transactions on Power Systems",
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TY - JOUR

T1 - Instability of Wind Turbine Converters during Current Injection to Low Voltage Grid Faults and PLL Frequency Based Stability Solution

AU - Göksu, Ömer

AU - Teodorescu, Remus

AU - Bak, Claus Leth

AU - Iov, Florin

AU - Kjær, Philip Carne

PY - 2014/1/9

Y1 - 2014/1/9

N2 - In recent grid codes for wind power integration, wind turbines are required to stay connected during grid faults even when the grid voltage drops down to zero; and also to inject reactive current in proportion to the voltage drop. However, a physical fact, instability of grid-connected converters during current injection to very low (close to zero) voltage faults, has been omitted, i.e., failed to be noticed in the previous wind power studies and grid code revisions. In this paper, the instability of grid side converters of wind turbines defined as loss of synchronism (LOS), where the wind turbines lose synchronism with the grid fundamental frequency (e.g., 50 Hz) during very deep voltage sags, is explored with its theory, analyzed and a novel stability solution based on PLL frequency is proposed; and both are verified with power system simulations and by experiments on a grid-connected converter setup.

AB - In recent grid codes for wind power integration, wind turbines are required to stay connected during grid faults even when the grid voltage drops down to zero; and also to inject reactive current in proportion to the voltage drop. However, a physical fact, instability of grid-connected converters during current injection to very low (close to zero) voltage faults, has been omitted, i.e., failed to be noticed in the previous wind power studies and grid code revisions. In this paper, the instability of grid side converters of wind turbines defined as loss of synchronism (LOS), where the wind turbines lose synchronism with the grid fundamental frequency (e.g., 50 Hz) during very deep voltage sags, is explored with its theory, analyzed and a novel stability solution based on PLL frequency is proposed; and both are verified with power system simulations and by experiments on a grid-connected converter setup.

KW - Converters

KW - Current control

KW - Power system faults

KW - Power system stability

KW - Wind power generation

U2 - 10.1109/TPWRS.2013.2295261

DO - 10.1109/TPWRS.2013.2295261

M3 - Journal article

VL - 29

SP - 1683

EP - 1691

JO - I E E E Transactions on Power Systems

JF - I E E E Transactions on Power Systems

SN - 0885-8950

IS - 4

ER -