Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer

Nowadays, the scale of power grid is remarkably increasing and there is a continuous reinforcement of AC–DC hybrid systems. Thus, the single-phase grounding fault currents on the AC grid-side of rectifier and inverter stations increase significantly, which may exceed the capacity limit of the circui...

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Autores principales:	Ensheng Zhao, Yang Han, Yuxiang Liu, Amr S. Zalhaf, Congling Wang, Ping Yang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Converter transformer Small reactor Neutral point Single phase grounding fault current HVDC transmission Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/6fd1da187e114a8ab1cc5dfb41f76f4b
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spelling	oai:doaj.org-article:6fd1da187e114a8ab1cc5dfb41f76f4b2021-12-04T04:35:10ZFeasibility analysis of neutral grounding by small reactor of HVDC converter transformer2352-484710.1016/j.egyr.2021.11.156https://doaj.org/article/6fd1da187e114a8ab1cc5dfb41f76f4b2022-04-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721013032https://doaj.org/toc/2352-4847Nowadays, the scale of power grid is remarkably increasing and there is a continuous reinforcement of AC–DC hybrid systems. Thus, the single-phase grounding fault currents on the AC grid-side of rectifier and inverter stations increase significantly, which may exceed the capacity limit of the circuit breakers. The large short-circuit currents would result in problems during equipment selection and threaten the safety of equipment and personnel. To solve such issue, the effect of the converter transformer on the single-phase grounding fault current on the grid-side is analyzed. The mechanism of high short-circuit current in DC near region is revealed. Also, the feasibility of neutral point earthing via small reactor at HVDC converter transformer to suppressing the single-phase grounding fault current is verified. In addition, the principle of selecting the suitable small reactor is summarized. The results show that the neutral point earthing via small reactor at converter transformer can effectively limit the single-phase grounding fault current on the AC-side. However, it would lead to an increase of overvoltage at the neutral point of HVDC transformer. Therefore, neutral grounding by small reactor might be implemented when the insulation level is satisfied.Ensheng ZhaoYang HanYuxiang LiuAmr S. ZalhafCongling WangPing YangElsevierarticleConverter transformerSmall reactorNeutral pointSingle phase grounding fault currentHVDC transmissionElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 8, Iss , Pp 392-399 (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Converter transformer Small reactor Neutral point Single phase grounding fault current HVDC transmission Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Converter transformer Small reactor Neutral point Single phase grounding fault current HVDC transmission Electrical engineering. Electronics. Nuclear engineering TK1-9971 Ensheng Zhao Yang Han Yuxiang Liu Amr S. Zalhaf Congling Wang Ping Yang Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer
description	Nowadays, the scale of power grid is remarkably increasing and there is a continuous reinforcement of AC–DC hybrid systems. Thus, the single-phase grounding fault currents on the AC grid-side of rectifier and inverter stations increase significantly, which may exceed the capacity limit of the circuit breakers. The large short-circuit currents would result in problems during equipment selection and threaten the safety of equipment and personnel. To solve such issue, the effect of the converter transformer on the single-phase grounding fault current on the grid-side is analyzed. The mechanism of high short-circuit current in DC near region is revealed. Also, the feasibility of neutral point earthing via small reactor at HVDC converter transformer to suppressing the single-phase grounding fault current is verified. In addition, the principle of selecting the suitable small reactor is summarized. The results show that the neutral point earthing via small reactor at converter transformer can effectively limit the single-phase grounding fault current on the AC-side. However, it would lead to an increase of overvoltage at the neutral point of HVDC transformer. Therefore, neutral grounding by small reactor might be implemented when the insulation level is satisfied.
format	article
author	Ensheng Zhao Yang Han Yuxiang Liu Amr S. Zalhaf Congling Wang Ping Yang
author_facet	Ensheng Zhao Yang Han Yuxiang Liu Amr S. Zalhaf Congling Wang Ping Yang
author_sort	Ensheng Zhao
title	Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer
title_short	Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer
title_full	Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer
title_fullStr	Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer
title_full_unstemmed	Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer
title_sort	feasibility analysis of neutral grounding by small reactor of hvdc converter transformer
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/6fd1da187e114a8ab1cc5dfb41f76f4b
work_keys_str_mv	AT enshengzhao feasibilityanalysisofneutralgroundingbysmallreactorofhvdcconvertertransformer AT yanghan feasibilityanalysisofneutralgroundingbysmallreactorofhvdcconvertertransformer AT yuxiangliu feasibilityanalysisofneutralgroundingbysmallreactorofhvdcconvertertransformer AT amrszalhaf feasibilityanalysisofneutralgroundingbysmallreactorofhvdcconvertertransformer AT conglingwang feasibilityanalysisofneutralgroundingbysmallreactorofhvdcconvertertransformer AT pingyang feasibilityanalysisofneutralgroundingbysmallreactorofhvdcconvertertransformer
_version_	1718372917055586304

Feasibility analysis of neutral grounding by small reactor of HVDC converter transformer

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