Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system

The hybrid HVDC system based on line commutated converter and modular multilevel converter is a feasible method to address the common commutation failure at the receiving end of conventional HVDC systems. At present, project Gezhouba–Shanghai in China is under the demonstration scheme of the convent...

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Autores principales:	Liangliang Hao, Chang Liu, Qingqing Zhan, Zhengguang Chen, Xingguo Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	LCC-MMC AC system fault DC current analysis Dynamic reactive power auxiliary Current control Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/d421b83e886644dc90505a44275aa6dc
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spelling	oai:doaj.org-article:d421b83e886644dc90505a44275aa6dc2021-11-26T04:33:59ZFault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system2352-484710.1016/j.egyr.2021.08.065https://doaj.org/article/d421b83e886644dc90505a44275aa6dc2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721006685https://doaj.org/toc/2352-4847The hybrid HVDC system based on line commutated converter and modular multilevel converter is a feasible method to address the common commutation failure at the receiving end of conventional HVDC systems. At present, project Gezhouba–Shanghai in China is under the demonstration scheme of the conventional receiving end upgrading, which introduces the difficulty in sending-end AC system failure riding through. For this purpose, an electromagnetic simulation model is established in the PSCAD/EMTDC simulation platform firstly, and then a transient analytical expression of DC current is deduced through the system equivalent circuit and verified through the simulation model. The expression deeply reveals the variation pattern of DC current and lays the theoretical foundation for fault ride-through control. Base on this expression, the decreasing level of MMC DC voltage after fault is deduced, however, it is difficult to realize the decreasing of MMC voltage due to the modulation index limitation of DC voltage. In order to solve this problem, this paper uses MMC to absorb reactive power from AC power grid to broaden the range of DC voltage drop. To solve this problem, the reactive power MMC absorbing from the AC power grid is used in this paper to broaden the decreasing range of DC voltage. On this basis, due to the conflict between the rapidity and stability of fault ride-through control, a current ride-through control based on reactive power auxiliary is proposed. This control strategy can dynamically regulate the reactive power transmission between MMC and AC grid according to fault states, assist to reduce the MMC DC voltage, and enable the constant current control so as to realize the sending-end AC system fault ride-through. Finally, the effectiveness of this control is verified with various simulation results. The sending-end AC system fault ride-through control method proposed in this paper has profound project application significance on upgrade transformation for the conventional receiving end.Liangliang HaoChang LiuQingqing ZhanZhengguang ChenXingguo WangElsevierarticleLCC-MMCAC system faultDC current analysisDynamic reactive power auxiliaryCurrent controlElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 118-133 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	LCC-MMC AC system fault DC current analysis Dynamic reactive power auxiliary Current control Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	LCC-MMC AC system fault DC current analysis Dynamic reactive power auxiliary Current control Electrical engineering. Electronics. Nuclear engineering TK1-9971 Liangliang Hao Chang Liu Qingqing Zhan Zhengguang Chen Xingguo Wang Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system
description	The hybrid HVDC system based on line commutated converter and modular multilevel converter is a feasible method to address the common commutation failure at the receiving end of conventional HVDC systems. At present, project Gezhouba–Shanghai in China is under the demonstration scheme of the conventional receiving end upgrading, which introduces the difficulty in sending-end AC system failure riding through. For this purpose, an electromagnetic simulation model is established in the PSCAD/EMTDC simulation platform firstly, and then a transient analytical expression of DC current is deduced through the system equivalent circuit and verified through the simulation model. The expression deeply reveals the variation pattern of DC current and lays the theoretical foundation for fault ride-through control. Base on this expression, the decreasing level of MMC DC voltage after fault is deduced, however, it is difficult to realize the decreasing of MMC voltage due to the modulation index limitation of DC voltage. In order to solve this problem, this paper uses MMC to absorb reactive power from AC power grid to broaden the range of DC voltage drop. To solve this problem, the reactive power MMC absorbing from the AC power grid is used in this paper to broaden the decreasing range of DC voltage. On this basis, due to the conflict between the rapidity and stability of fault ride-through control, a current ride-through control based on reactive power auxiliary is proposed. This control strategy can dynamically regulate the reactive power transmission between MMC and AC grid according to fault states, assist to reduce the MMC DC voltage, and enable the constant current control so as to realize the sending-end AC system fault ride-through. Finally, the effectiveness of this control is verified with various simulation results. The sending-end AC system fault ride-through control method proposed in this paper has profound project application significance on upgrade transformation for the conventional receiving end.
format	article
author	Liangliang Hao Chang Liu Qingqing Zhan Zhengguang Chen Xingguo Wang
author_facet	Liangliang Hao Chang Liu Qingqing Zhan Zhengguang Chen Xingguo Wang
author_sort	Liangliang Hao
title	Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system
title_short	Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system
title_full	Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system
title_fullStr	Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system
title_full_unstemmed	Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system
title_sort	fault ride-through control for the sending-end ac system based on reactive power auxiliary in lcc-mmc hybrid hvdc system
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/d421b83e886644dc90505a44275aa6dc
work_keys_str_mv	AT lianglianghao faultridethroughcontrolforthesendingendacsystembasedonreactivepowerauxiliaryinlccmmchybridhvdcsystem AT changliu faultridethroughcontrolforthesendingendacsystembasedonreactivepowerauxiliaryinlccmmchybridhvdcsystem AT qingqingzhan faultridethroughcontrolforthesendingendacsystembasedonreactivepowerauxiliaryinlccmmchybridhvdcsystem AT zhengguangchen faultridethroughcontrolforthesendingendacsystembasedonreactivepowerauxiliaryinlccmmchybridhvdcsystem AT xingguowang faultridethroughcontrolforthesendingendacsystembasedonreactivepowerauxiliaryinlccmmchybridhvdcsystem
_version_	1718409870244315136

Fault ride-through control for the sending-end AC system based on reactive power auxiliary in LCC-MMC hybrid HVDC system

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