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Operation Analysis of Thyristor Based Front-to-Front Active-Forced-Commutated Bridge DC Transformer in LCC and VSC Hybrid HVDC Networks

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Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Early online date14 Aug 2017
DOIs
Publication statusPublished - Dec 2017

Abstract

The active-forced-commutated (AFC) bridge employs a symmetrical thyristor-bridge with auxiliary self-commutated full-bridge chain-link (FB-CL) circuit to assist its soft transition and forced commutation. This combination can form a thyristor based voltage source converter (VSC) with significantly reduced on-state losses and dc-fault blocking capability. Due to the full topological symmetry of the AFC-bridge, either current direction or dc-link voltage polarity can be reversed for power flow reversal as for the full-bridge modular multilevel converter (FB-MMC). Thus, the AFC-bridge is compatible with both line-commutated-converter (LCC) and VSC terminals in a multi-terminal high voltage direct current (MT-HVDC) network. This paper investigates its front-to-front (F2F) dc-dc application for matching the regional dc grids in a LCC and VSC hybrid HVDC network. Simulation studies are carried out to demonstrate its potentials as a high efficiency multi-functional solution for dc-dc conversion.

    Research areas

  • Active-forced-commutated bridge, Bridge circuits, dc-link voltage reversal, front-to-front dc-dc converter, high efficiency VSC, HVDC transmission, IGBT, LCC and VSC hybrid HVDC grid, Load flow, thyristor, Thyristors, Topology, Voltage control

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