Robust Fault Ride-Through of Converter-based Generation during Severe Faults with Phase Jumps

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Resumé

As grid-connected converters are at risk of losing synchronism with the grid when exposed to extreme voltage sags, this might jeopardize the stability during a fault and a converter's ability to comply with fault ride-through requirements. This paper investigates the synchronization stability of grid-tied converters during severe symmetrical faults with phase jumps. To achieve zero-voltage ride-through capability, a frozen PLL structure can be employed to guarantee stability during faults. However, as the frozen PLL approach is unaware of frequency drifts and phase-angle jumps in the grid voltage, its performance during non-constant frequency and phase is unknown. Therefore, this paper investigates and provides new insight into how the frozen PLL performs during phase jumps and reveals whether phase compensation should be utilized to improve the converter response during a severe symmetrical fault. It is disclosed, that even though phase compensation can improve the injected currents during a fault situation including large phase jumps, a non-compensated frozen PLL can inherently ensure stability and allow for zero-voltage ride-through capability at an acceptable current injection. Furthermore, the robustness of the frozen PLL has been analyzed through a comprehensive simulation study where three test cases have been experimentally verified, which confirms the presented findings.
OriginalsprogEngelsk
TidsskriftIEEE Transactions on Industry Applications
ISSN0093-9994
DOI
StatusE-pub ahead of print - 2020

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Phase locked loops
Electric potential
Synchronization
Robustness (control systems)
Compensation and Redress

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@article{33ca26ad31794c18a9e21efc054f22ac,
title = "Robust Fault Ride-Through of Converter-based Generation during Severe Faults with Phase Jumps",
abstract = "As grid-connected converters are at risk of losing synchronism with the grid when exposed to extreme voltage sags, this might jeopardize the stability during a fault and a converter's ability to comply with fault ride-through requirements. This paper investigates the synchronization stability of grid-tied converters during severe symmetrical faults with phase jumps. To achieve zero-voltage ride-through capability, a frozen PLL structure can be employed to guarantee stability during faults. However, as the frozen PLL approach is unaware of frequency drifts and phase-angle jumps in the grid voltage, its performance during non-constant frequency and phase is unknown. Therefore, this paper investigates and provides new insight into how the frozen PLL performs during phase jumps and reveals whether phase compensation should be utilized to improve the converter response during a severe symmetrical fault. It is disclosed, that even though phase compensation can improve the injected currents during a fault situation including large phase jumps, a non-compensated frozen PLL can inherently ensure stability and allow for zero-voltage ride-through capability at an acceptable current injection. Furthermore, the robustness of the frozen PLL has been analyzed through a comprehensive simulation study where three test cases have been experimentally verified, which confirms the presented findings.",
keywords = "Grid-Connection, Voltage-Source Converter, Grid Fault, Synchronization Stability, Fault Ride-Through, Phase jumps",
author = "Taul, {Mads Graungaard} and Xiongfei Wang and Pooya Davari and Frede Blaabjerg",
year = "2020",
doi = "10.1109/TIA.2019.2944175",
language = "English",
journal = "I E E E Transactions on Industry Applications",
issn = "0093-9994",
publisher = "IEEE",

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TY - JOUR

T1 - Robust Fault Ride-Through of Converter-based Generation during Severe Faults with Phase Jumps

AU - Taul, Mads Graungaard

AU - Wang, Xiongfei

AU - Davari, Pooya

AU - Blaabjerg, Frede

PY - 2020

Y1 - 2020

N2 - As grid-connected converters are at risk of losing synchronism with the grid when exposed to extreme voltage sags, this might jeopardize the stability during a fault and a converter's ability to comply with fault ride-through requirements. This paper investigates the synchronization stability of grid-tied converters during severe symmetrical faults with phase jumps. To achieve zero-voltage ride-through capability, a frozen PLL structure can be employed to guarantee stability during faults. However, as the frozen PLL approach is unaware of frequency drifts and phase-angle jumps in the grid voltage, its performance during non-constant frequency and phase is unknown. Therefore, this paper investigates and provides new insight into how the frozen PLL performs during phase jumps and reveals whether phase compensation should be utilized to improve the converter response during a severe symmetrical fault. It is disclosed, that even though phase compensation can improve the injected currents during a fault situation including large phase jumps, a non-compensated frozen PLL can inherently ensure stability and allow for zero-voltage ride-through capability at an acceptable current injection. Furthermore, the robustness of the frozen PLL has been analyzed through a comprehensive simulation study where three test cases have been experimentally verified, which confirms the presented findings.

AB - As grid-connected converters are at risk of losing synchronism with the grid when exposed to extreme voltage sags, this might jeopardize the stability during a fault and a converter's ability to comply with fault ride-through requirements. This paper investigates the synchronization stability of grid-tied converters during severe symmetrical faults with phase jumps. To achieve zero-voltage ride-through capability, a frozen PLL structure can be employed to guarantee stability during faults. However, as the frozen PLL approach is unaware of frequency drifts and phase-angle jumps in the grid voltage, its performance during non-constant frequency and phase is unknown. Therefore, this paper investigates and provides new insight into how the frozen PLL performs during phase jumps and reveals whether phase compensation should be utilized to improve the converter response during a severe symmetrical fault. It is disclosed, that even though phase compensation can improve the injected currents during a fault situation including large phase jumps, a non-compensated frozen PLL can inherently ensure stability and allow for zero-voltage ride-through capability at an acceptable current injection. Furthermore, the robustness of the frozen PLL has been analyzed through a comprehensive simulation study where three test cases have been experimentally verified, which confirms the presented findings.

KW - Grid-Connection

KW - Voltage-Source Converter

KW - Grid Fault

KW - Synchronization Stability

KW - Fault Ride-Through

KW - Phase jumps

U2 - 10.1109/TIA.2019.2944175

DO - 10.1109/TIA.2019.2944175

M3 - Journal article

JO - I E E E Transactions on Industry Applications

JF - I E E E Transactions on Industry Applications

SN - 0093-9994

ER -