Current Limiting Control with Enhanced Dynamics of Grid-Forming Converters during Fault Conditions

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

4 Downloads (Pure)

Resumé

With an increasing capacity in converter-based generation to the modern power system, a growing demand for such systems to be more grid-friendly has emerged. Consequently, grid-forming converters have been proposed as a promising solution as they are compatible with the conventional synchronous-machine-based power system. However, most research focuses on the grid-forming control during normal operating conditions without considering the fundamental distinction between a grid-forming converter and a synchronous machine when considering its short-circuit capability. Current limitation of grid-forming converters during fault conditions is not well described in the available literature and present solutions often aim to switch the control structure to a grid-following structure during the fault. Yet, for a future converter-based power system with no or little integration of synchronous machines, the converters need to preserve their voltage-mode characteristics and be robust towards weak-grid conditions. To address this issue, this paper discusses the fundamental issue of grid-forming converter control during grid fault conditions and proposes a fault-mode controller which keeps the voltage-mode characteristics of the grid-forming structure while simultaneously limiting the converter currents to an admissible value. The proposed method is evaluated in a detailed simulation model and verified through an experimental test setup.
OriginalsprogEngelsk
TidsskriftIEEE Journal of Emerging and Selected Topics in Power Electronics
Antal sider12
ISSN2168-6777
DOI
StatusE-pub ahead of print - jul. 2019

Fingerprint

Electric potential
Short circuit currents
Switches
Controllers

Citer dette

@article{53bab1039bcd4d4dbb2602c7fbfceb11,
title = "Current Limiting Control with Enhanced Dynamics of Grid-Forming Converters during Fault Conditions",
abstract = "With an increasing capacity in converter-based generation to the modern power system, a growing demand for such systems to be more grid-friendly has emerged. Consequently, grid-forming converters have been proposed as a promising solution as they are compatible with the conventional synchronous-machine-based power system. However, most research focuses on the grid-forming control during normal operating conditions without considering the fundamental distinction between a grid-forming converter and a synchronous machine when considering its short-circuit capability. Current limitation of grid-forming converters during fault conditions is not well described in the available literature and present solutions often aim to switch the control structure to a grid-following structure during the fault. Yet, for a future converter-based power system with no or little integration of synchronous machines, the converters need to preserve their voltage-mode characteristics and be robust towards weak-grid conditions. To address this issue, this paper discusses the fundamental issue of grid-forming converter control during grid fault conditions and proposes a fault-mode controller which keeps the voltage-mode characteristics of the grid-forming structure while simultaneously limiting the converter currents to an admissible value. The proposed method is evaluated in a detailed simulation model and verified through an experimental test setup.",
keywords = "Grid-Connection, Voltage-Source Converter, Grid-Forming Control, Fault Ride-Through, Current limitation",
author = "Taul, {Mads Graungaard} and Xiongfei Wang and Pooya Davari and Frede Blaabjerg",
year = "2019",
month = "7",
doi = "10.1109/JESTPE.2019.2931477",
language = "English",
journal = "I E E E Journal of Emerging and Selected Topics in Power Electronics",
issn = "2168-6777",
publisher = "IEEE",

}

TY - JOUR

T1 - Current Limiting Control with Enhanced Dynamics of Grid-Forming Converters during Fault Conditions

AU - Taul, Mads Graungaard

AU - Wang, Xiongfei

AU - Davari, Pooya

AU - Blaabjerg, Frede

PY - 2019/7

Y1 - 2019/7

N2 - With an increasing capacity in converter-based generation to the modern power system, a growing demand for such systems to be more grid-friendly has emerged. Consequently, grid-forming converters have been proposed as a promising solution as they are compatible with the conventional synchronous-machine-based power system. However, most research focuses on the grid-forming control during normal operating conditions without considering the fundamental distinction between a grid-forming converter and a synchronous machine when considering its short-circuit capability. Current limitation of grid-forming converters during fault conditions is not well described in the available literature and present solutions often aim to switch the control structure to a grid-following structure during the fault. Yet, for a future converter-based power system with no or little integration of synchronous machines, the converters need to preserve their voltage-mode characteristics and be robust towards weak-grid conditions. To address this issue, this paper discusses the fundamental issue of grid-forming converter control during grid fault conditions and proposes a fault-mode controller which keeps the voltage-mode characteristics of the grid-forming structure while simultaneously limiting the converter currents to an admissible value. The proposed method is evaluated in a detailed simulation model and verified through an experimental test setup.

AB - With an increasing capacity in converter-based generation to the modern power system, a growing demand for such systems to be more grid-friendly has emerged. Consequently, grid-forming converters have been proposed as a promising solution as they are compatible with the conventional synchronous-machine-based power system. However, most research focuses on the grid-forming control during normal operating conditions without considering the fundamental distinction between a grid-forming converter and a synchronous machine when considering its short-circuit capability. Current limitation of grid-forming converters during fault conditions is not well described in the available literature and present solutions often aim to switch the control structure to a grid-following structure during the fault. Yet, for a future converter-based power system with no or little integration of synchronous machines, the converters need to preserve their voltage-mode characteristics and be robust towards weak-grid conditions. To address this issue, this paper discusses the fundamental issue of grid-forming converter control during grid fault conditions and proposes a fault-mode controller which keeps the voltage-mode characteristics of the grid-forming structure while simultaneously limiting the converter currents to an admissible value. The proposed method is evaluated in a detailed simulation model and verified through an experimental test setup.

KW - Grid-Connection

KW - Voltage-Source Converter

KW - Grid-Forming Control

KW - Fault Ride-Through

KW - Current limitation

U2 - 10.1109/JESTPE.2019.2931477

DO - 10.1109/JESTPE.2019.2931477

M3 - Journal article

JO - I E E E Journal of Emerging and Selected Topics in Power Electronics

JF - I E E E Journal of Emerging and Selected Topics in Power Electronics

SN - 2168-6777

ER -