Power reversal strategies for hybrid LCC/MMC HVDC systems

Power reversal control strategies for different types of hybrid line-commutated-converter (LCC)/modular multi-level converter (MMC) based high-voltage direct-current (HVDC) systems have been proposed with the consideration of system configurations and MMC's topologies. The studies show that the...

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Bibliographic Details
Published inCSEE Journal of Power and Energy Systems Vol. 6; no. 1; pp. 203 - 212
Main Authors Gen Li, Ting An, Jun Liang, Wei Liu, Tibin Joseph, Jingjing Lu, Marcio Szechtman, Bjarne R. Andersen, Yuanliang Lan
Format Journal Article
LanguageEnglish
Published Beijing Chinese Society for Electrical Engineering Journal of Power and Energy Systems 01.03.2020
China electric power research institute
Subjects
Capital costs
Hybrid systems
Switches
Topology
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Summary:Power reversal control strategies for different types of hybrid line-commutated-converter (LCC)/modular multi-level converter (MMC) based high-voltage direct-current (HVDC) systems have been proposed with the consideration of system configurations and MMC's topologies. The studies show that the full-bridge (FB) MMC gives better performance than halfbridge (HB) MMCs in terms of power reversal in hybrid LCC/MMC systems. The modulation method employed in this paper can achieve a smooth online polarity reversal for hybrid LCC/FB-MMC HVDC systems. Additional DC switches and/or discharging resistors may be needed to reverse the DC polarity of LCC/HB-MMC HVDC systems. Based on the proposed strategies, the power reversal processes of the studied systems can be accomplished within several seconds. The speed can be changed according to system operation requirements. The effectiveness of the proposed control strategies has been verified through simulations conducted in PSCAD/EMTDC.
ISSN:2096-0042
2096-0042
DOI:10.17775/CSEEJPES.2019.01050