Studies of commutation failures in hybrid LCC/MMC HVDC systems

A hybrid of line commutated converters (LCCs) and modular multi-level converters (MMCs) can provide the advantages of both the technologies. However, the commutation failure still exists if the LCC operates as an inverter in a hybrid LCC/MMC system. In this paper, the system behavior during a commut...

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Bibliographic Details
Published inGlobal Energy Interconnection Vol. 3; no. 3; pp. 193 - 204
Main Authors Li, Gen, An, Ting, Liang, Jun, Liu, Wei, Joseph, Tibin, Lu, Jingjing, Lan, Yuanliang
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2020
KeAi Communications Co., Ltd
Subjects
Commutation failure
Fault protection
Hybrid LCC/MMC
LCC HVDC
MMC HVDC
Modular multilevel converter
multi-terminal DC
Hybrid LCC/MMC
LCC HVDC
Commutation failure
Fault protection
MMC HVDC
Modular multilevel converter
multi-terminal DC
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Summary:A hybrid of line commutated converters (LCCs) and modular multi-level converters (MMCs) can provide the advantages of both the technologies. However, the commutation failure still exists if the LCC operates as an inverter in a hybrid LCC/MMC system. In this paper, the system behavior during a commutation failure is investigated. Both half- bridge and full-bridge MMCs are considered. Control strategies are examined through simulations conducted in PSCAD/ EMTDC. Additionally, commutation failure protection strategies for multi-terminal hybrid LCC/MMC systems with AC and DC circuit breakers are studied. This paper can contribute to the protection design of future hybrid LCC/MMC systems against commutation failures.
ISSN:2096-5117
DOI:10.1016/j.gloei.2020.07.001