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

Roni Luhtala; Tuomas Messo; Tomi Roinila; Henrik Alenius; Erik De Jong; Andrew Burstein; Alejandra Fabian

doi:10.3390/en12142674

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

Roni Luhtala, Tuomas Messo, Tomi Roinila, Henrik Alenius, Erik De Jong, Andrew Burstein, Alejandra Fabian

Tutkimustuotos: Artikkeli › Tieteellinen › vertaisarvioitu

18 Sitaatiot (Scopus)

16 Lataukset (Pure)

Abstrakti

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.

Alkuperäiskieli	Englanti
Artikkeli	2674
Julkaisu	Energies
Vuosikerta	12
Numero	14
DOI - pysyväislinkit	https://doi.org/10.3390/en12142674
Tila	Julkaistu - 2019
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Rahoitus

Funding: This research and testing has been performed using the ERIGrid Research Infrastructure, and is part of a project that has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement Number 654113. The support of the European Research Infrastructure ERIGrid and its partner DNVGL is very much appreciated. Moreover, part of the study was funded by the Academy of Finland (Mitigation of harmonic resonances in three-phase renewable energy systems, grant number 297054).

Julkaisufoorumi-taso

Jufo-taso 1

!!ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Energy (miscellaneous)
Control and Optimization
Electrical and Electronic Engineering

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10.3390/en12142674Lisenssi: CC BY

energies-12-02674Final published version, 3,81 MBLisenssi: CC BY

http://urn.fi/URN:NBN:fi:tty-201909022052Lisenssi: CC BY

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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",

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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

AN - SCOPUS:85068784950

SN - 1996-1073

VL - 12

JO - Energies

JF - Energies

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M1 - 2674

ER -

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

Abstrakti

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Julkaisufoorumi-taso

!!ASJC Scopus subject areas

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