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Power reversal strategies for hybrid LCC/MMC HVDC systems

Li, Gen, An, Ting, Liang, Jun, Liu, Wei, Joseph, Tibin, Lu, Jingjing, Szechtman, Marcio, Andersen, Bjarne R. and Lan, Yuanliang 2020. Power reversal strategies for hybrid LCC/MMC HVDC systems. CSEE Journal of Power and Energy Systems 6 (1) , pp. 203-212. 10.17775/CSEEJPES.2019.01050

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: IEEE
ISSN: 2096-0042
Date of First Compliant Deposit: 9 January 2020
Date of Acceptance: 1 January 2020
Last Modified: 01 Nov 2021 16:26

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