A cascaded converter interfacing long distance HVDC and back-to-back HVDC systems

Wang Xiang, Ruizhang Yang, Chang Lin, Jiapei Zhou, Jinyu Wen, Weixing Lin

Research output: Contribution to journalArticle

Abstract

This paper proposes a cascaded converter dedicated to long-distance HVDC infeed and asynchronous back-to-back interconnection of receiving grids. The cascaded converter is consisted of MMCs in series and parallel connection, meeting the high DC voltage and power demand of HVDC system. It realizes hierarchical feeding and asynchronous interconnection of receiving grids, optimizing the multi-infeed short circuit ratio and improving the flexibility of the receiving grids. The topology and operating characteristics of the cascaded converter are introduced in detail. The multi-infeed short-circuits ratio (MISCR) and the maximum power infeed of the cascaded converter based HVDC systems are analyzed. Various feasible operating modes with online switching strategies of the cascaded converter are studied to improve the operational flexibility of the system. The simulation results verify the effectiveness of the control strategy of the HVDC system embedding the cascaded converter. The DC faults clearing strategy and operating modes switching strategies are also validated.
Original languageEnglish
Number of pages13
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Early online date30 Apr 2019
DOIs
Publication statusE-pub ahead of print - 30 Apr 2019

Keywords

  • HVDC transmission
  • integrated circuit interconnections
  • inverters
  • topology
  • power grids

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