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.
Original language | English |
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Pages (from-to) | 1657 - 1669 |
Number of pages | 13 |
Journal | IEEE Journal of Emerging and Selected Topics in Power Electronics |
Early online date | 14 Aug 2017 |
DOIs | |
Publication status | Published - Dec 2017 |
Keywords / Materials (for Non-textual outputs)
- 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