Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics

Grid impedance is an important parameter and is used to perform impedance-based stability analysis for the operation of grid-connected systems, such as power electronics-interfaced solar, wind and other distributed power generation systems. The identification of grid impedance with the help of broad...

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Autores principales:	Matthias Buchner, Krzysztof Rudion
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	impedance-based stability small-signal stability power electronics harmonic disturbances spectral leakage broadband signals Technology T
Acceso en línea:	https://doaj.org/article/2bd868410eba4b6f863805d7a4290b48
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id	oai:doaj.org-article:2bd868410eba4b6f863805d7a4290b48
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spelling	oai:doaj.org-article:2bd868410eba4b6f863805d7a4290b482021-11-11T16:06:51ZIdentification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics10.3390/en142173981996-1073https://doaj.org/article/2bd868410eba4b6f863805d7a4290b482021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7398https://doaj.org/toc/1996-1073Grid impedance is an important parameter and is used to perform impedance-based stability analysis for the operation of grid-connected systems, such as power electronics-interfaced solar, wind and other distributed power generation systems. The identification of grid impedance with the help of broadband signals is a popular method, but its robustness depends strongly on the harmonic disturbances caused by non-linear loads or power electronics. This paper provides an in-depth analysis of how harmonics affect the identification of grid impedance while using broadband measurements. Furthermore, a compensation method is proposed to remove the disturbing influences of harmonics on broadband impedance identification. This method is based on exploiting the properties of the used maximum-length binary sequence (MLBS). To explain the methodology of the proposed method, the design basis for the excitation signal is discussed in detail. The analysis from simulations and a real measurement in an industrial power grid shows the effectiveness of the proposed method in compensating the disturbing influences of harmonics on broadband impedance measurements.Matthias BuchnerKrzysztof RudionMDPI AGarticleimpedance-based stabilitysmall-signal stabilitypower electronicsharmonic disturbancesspectral leakagebroadband signalsTechnologyTENEnergies, Vol 14, Iss 7398, p 7398 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	impedance-based stability small-signal stability power electronics harmonic disturbances spectral leakage broadband signals Technology T
spellingShingle	impedance-based stability small-signal stability power electronics harmonic disturbances spectral leakage broadband signals Technology T Matthias Buchner Krzysztof Rudion Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics
description	Grid impedance is an important parameter and is used to perform impedance-based stability analysis for the operation of grid-connected systems, such as power electronics-interfaced solar, wind and other distributed power generation systems. The identification of grid impedance with the help of broadband signals is a popular method, but its robustness depends strongly on the harmonic disturbances caused by non-linear loads or power electronics. This paper provides an in-depth analysis of how harmonics affect the identification of grid impedance while using broadband measurements. Furthermore, a compensation method is proposed to remove the disturbing influences of harmonics on broadband impedance identification. This method is based on exploiting the properties of the used maximum-length binary sequence (MLBS). To explain the methodology of the proposed method, the design basis for the excitation signal is discussed in detail. The analysis from simulations and a real measurement in an industrial power grid shows the effectiveness of the proposed method in compensating the disturbing influences of harmonics on broadband impedance measurements.
format	article
author	Matthias Buchner Krzysztof Rudion
author_facet	Matthias Buchner Krzysztof Rudion
author_sort	Matthias Buchner
title	Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics
title_short	Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics
title_full	Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics
title_fullStr	Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics
title_full_unstemmed	Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics
title_sort	identification of grid impedance by broadband signals in power systems with high harmonics
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2bd868410eba4b6f863805d7a4290b48
work_keys_str_mv	AT matthiasbuchner identificationofgridimpedancebybroadbandsignalsinpowersystemswithhighharmonics AT krzysztofrudion identificationofgridimpedancebybroadbandsignalsinpowersystemswithhighharmonics
_version_	1718432403988414464

Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics

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