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Identification of three-phase grid impedance in the presence of parallel converters

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Identification of three-phase grid impedance in the presence of parallel converters. / Luhtala, Roni; Messo, Tuomas; Roinila, Tomi; Alenius, Henrik; Jong, Erik De; Burstein, Andrew; Fabian, Alejandra.

In: Energies, Vol. 12, No. 14, 2674, 2019.

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Luhtala, Roni ; Messo, Tuomas ; Roinila, Tomi ; Alenius, Henrik ; Jong, Erik De ; Burstein, Andrew ; Fabian, Alejandra. / Identification of three-phase grid impedance in the presence of parallel converters. In: Energies. 2019 ; Vol. 12, No. 14.

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@article{a9dca18fb85a424f9a4036179daf7c1b,
title = "Identification of three-phase grid impedance in the presence of parallel converters",
abstract = "Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value. Grid impedance may change rapidly due to fault or disconnection of a transmission line. Therefore, online grid identification methods have been recently proposed to have up-to-date information about the grid impedance value. This is usually done by perturbing the converter output current and measuring the response in output voltage. However, any parallel converters connected to the same interface point will cause errors, since the measured current differs from the current that is flowing through the grid interface point. This paper points out challenges and errors in grid impedance identification, caused by parallel converters and their internal control functions, such as grid-voltage support. Experimental grid-impedance measurements are shown from the power hardware-in-the-loop setup developed at DNV-GL Flexible Power Grid Lab.",
keywords = "DC–AC power converters, Grid impedance identification, Power hardware-in-the-loop",
author = "Roni Luhtala and Tuomas Messo and Tomi Roinila and Henrik Alenius and Jong, {Erik De} and Andrew Burstein and Alejandra Fabian",
year = "2019",
doi = "10.3390/en12142674",
language = "English",
volume = "12",
journal = "Energies",
issn = "1996-1073",
publisher = "MDPI",
number = "14",

}

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TY - JOUR

T1 - Identification of three-phase grid impedance in the presence of parallel converters

AU - Luhtala, Roni

AU - Messo, Tuomas

AU - Roinila, Tomi

AU - Alenius, Henrik

AU - Jong, Erik De

AU - Burstein, Andrew

AU - Fabian, Alejandra

PY - 2019

Y1 - 2019

N2 - Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value. Grid impedance may change rapidly due to fault or disconnection of a transmission line. Therefore, online grid identification methods have been recently proposed to have up-to-date information about the grid impedance value. This is usually done by perturbing the converter output current and measuring the response in output voltage. However, any parallel converters connected to the same interface point will cause errors, since the measured current differs from the current that is flowing through the grid interface point. This paper points out challenges and errors in grid impedance identification, caused by parallel converters and their internal control functions, such as grid-voltage support. Experimental grid-impedance measurements are shown from the power hardware-in-the-loop setup developed at DNV-GL Flexible Power Grid Lab.

AB - Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value. Grid impedance may change rapidly due to fault or disconnection of a transmission line. Therefore, online grid identification methods have been recently proposed to have up-to-date information about the grid impedance value. This is usually done by perturbing the converter output current and measuring the response in output voltage. However, any parallel converters connected to the same interface point will cause errors, since the measured current differs from the current that is flowing through the grid interface point. This paper points out challenges and errors in grid impedance identification, caused by parallel converters and their internal control functions, such as grid-voltage support. Experimental grid-impedance measurements are shown from the power hardware-in-the-loop setup developed at DNV-GL Flexible Power Grid Lab.

KW - DC–AC power converters

KW - Grid impedance identification

KW - Power hardware-in-the-loop

U2 - 10.3390/en12142674

DO - 10.3390/en12142674

M3 - Article

VL - 12

JO - Energies

JF - Energies

SN - 1996-1073

IS - 14

M1 - 2674

ER -