Key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems

The key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems are investigated, focusing on the design of system configurations, converter topologies and the control and protection system. A double converter per pole of VSC connection is proposed along with the design of a 5000 MW VSC valve...

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Bibliographic Details
Published inCSEE Journal of Power and Energy Systems Vol. 5; no. 3; pp. 365 - 373
Main Authors Rao, Hong, Zhou, Yuebin
Format Journal Article
LanguageEnglish
Published Beijing Chinese Society for Electrical Engineering Journal of Power and Energy Systems 01.09.2019
China electric power research institute
Subjects
Configuration management
Control systems
Converters
High voltages
HVDC
Hybrid systems
LCC
multi-terminal
overhead line
Topology
ultra-high voltage
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Summary:The key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems are investigated, focusing on the design of system configurations, converter topologies and the control and protection system. A double converter per pole of VSC connection is proposed along with the design of a 5000 MW VSC valve to develop a ± 800 kV/5000 MW large-capacity power transmission. The hybrid MMC topology capable of clearing the DC faults and the control strategy are developed to effectively improve the reliability in case of overhead line faults. The control and protection system of the LCC-VSC MTDC system is introduced to offer flexible operations under both normal and abnormal conditions, which includes voltage/current margin-based coordination, converter switch-in and switch-out, re-connection and drop-off of a third station. Simulations of an LCC-VSC MTDC system based on the LCC-VSC MTDC project are performed.
ISSN:2096-0042
2096-0042
DOI:10.17775/CSEEJPES.2019.01140