Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System

The series line-commutated converter (LCC) and modular multilevel converter (MMC) hybrid HVDC system provides a more economical and flexible alternative for UHVDC transmission. With the LCC DC voltage reduction, no current cut-off will occur under slight rectifier-side AC faults. However, with the l...

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Autores principales:	Xiaodong Li, Zheng Xu, Zheren Zhang
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Line commutated converter (LCC) modular multilevel converter (MMC) current cut-off third harmonic voltage injection (THVI) backup DC current control Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/52932654c5684f38b52a8947c0ed8d57
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spelling	oai:doaj.org-article:52932654c5684f38b52a8947c0ed8d572021-11-20T00:01:20ZEnhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System2169-353610.1109/ACCESS.2021.3127717https://doaj.org/article/52932654c5684f38b52a8947c0ed8d572021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9612209/https://doaj.org/toc/2169-3536The series line-commutated converter (LCC) and modular multilevel converter (MMC) hybrid HVDC system provides a more economical and flexible alternative for UHVDC transmission. With the LCC DC voltage reduction, no current cut-off will occur under slight rectifier-side AC faults. However, with the limitation of the MMC voltage modulation ratio, when the rectifier-side AC fault is extremely acute, the current cut-off will unavoidably exist, resulting in enormous impacts on AC and DC systems. To reduce the risk of the current cut-off and improve fault recovery, this paper proposes an enhanced coordinated control strategy. First, under the varying severity of rectifier-side AC faults, the <inline-formula> <tex-math notation="LaTeX">$U$ </tex-math></inline-formula>-<inline-formula> <tex-math notation="LaTeX">$I$ </tex-math></inline-formula> operation characteristics are meticulously analyzed. Then, the third harmonic voltage injection (THVI) and reactive power dynamic adjustment (RPDA) are introduced to expand the operation range of MMC DC voltage. Based on the enlarged operation range, a backup DC current control of MMC is proposed to adaptively regulate the MMC DC voltage relying on the fault severity. Finally, the feasibility and effectiveness of the proposed coordinated control strategy is verified through several simulation scenarios of varied fault severity on PSCAD/EMTDC. The simulation results show that, the proposed control enlarges the system operation range, improves the fault recovery, and significantly reduces the risk of current cut-off.Xiaodong LiZheng XuZheren ZhangIEEEarticleLine commutated converter (LCC)modular multilevel converter (MMC)current cut-offthird harmonic voltage injection (THVI)backup DC current controlElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 153050-153057 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Line commutated converter (LCC) modular multilevel converter (MMC) current cut-off third harmonic voltage injection (THVI) backup DC current control Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Line commutated converter (LCC) modular multilevel converter (MMC) current cut-off third harmonic voltage injection (THVI) backup DC current control Electrical engineering. Electronics. Nuclear engineering TK1-9971 Xiaodong Li Zheng Xu Zheren Zhang Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System
description	The series line-commutated converter (LCC) and modular multilevel converter (MMC) hybrid HVDC system provides a more economical and flexible alternative for UHVDC transmission. With the LCC DC voltage reduction, no current cut-off will occur under slight rectifier-side AC faults. However, with the limitation of the MMC voltage modulation ratio, when the rectifier-side AC fault is extremely acute, the current cut-off will unavoidably exist, resulting in enormous impacts on AC and DC systems. To reduce the risk of the current cut-off and improve fault recovery, this paper proposes an enhanced coordinated control strategy. First, under the varying severity of rectifier-side AC faults, the <inline-formula> <tex-math notation="LaTeX">$U$ </tex-math></inline-formula>-<inline-formula> <tex-math notation="LaTeX">$I$ </tex-math></inline-formula> operation characteristics are meticulously analyzed. Then, the third harmonic voltage injection (THVI) and reactive power dynamic adjustment (RPDA) are introduced to expand the operation range of MMC DC voltage. Based on the enlarged operation range, a backup DC current control of MMC is proposed to adaptively regulate the MMC DC voltage relying on the fault severity. Finally, the feasibility and effectiveness of the proposed coordinated control strategy is verified through several simulation scenarios of varied fault severity on PSCAD/EMTDC. The simulation results show that, the proposed control enlarges the system operation range, improves the fault recovery, and significantly reduces the risk of current cut-off.
format	article
author	Xiaodong Li Zheng Xu Zheren Zhang
author_facet	Xiaodong Li Zheng Xu Zheren Zhang
author_sort	Xiaodong Li
title	Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System
title_short	Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System
title_full	Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System
title_fullStr	Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System
title_full_unstemmed	Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System
title_sort	enhanced ride-through capability under rectifier-side ac fault for series lcc-mmc hybrid hvdc system
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/52932654c5684f38b52a8947c0ed8d57
work_keys_str_mv	AT xiaodongli enhancedridethroughcapabilityunderrectifiersideacfaultforserieslccmmchybridhvdcsystem AT zhengxu enhancedridethroughcapabilityunderrectifiersideacfaultforserieslccmmchybridhvdcsystem AT zherenzhang enhancedridethroughcapabilityunderrectifiersideacfaultforserieslccmmchybridhvdcsystem
_version_	1718419831521280000

Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System

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