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

Peng Li; Grain P. Adam; Stephen J. Finney; Derrick Holliday

doi:10.1109/JESTPE.2017.2739424

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

Peng Li, Grain P. Adam, Stephen J. Finney, Derrick Holliday

Research output: Contribution to journal › Article › peer-review

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Abstract

The active-forced-commutated (AFC) bridge employs a symmetrical thyristor-bridge with auxiliary self-commutated full-bridge chain-link 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. Thus, the AFC-bridge is compatible with both line-commutated-converter (LCC) and VSC terminals in a multiterminal high-voltage direct current network. This paper investigates its front-to-front (F2F) dc-dc application for matching the regional dc grids in an LCC and VSC hybrid HVDC network. Simulation studies are carried out to demonstrate its potentials as a high-efficiency multifunctional solution for dc-dc conversion.

Original language	English
Pages (from-to)	1657-1669
Number of pages	13
Journal	IEEE Journal of Emerging and Selected Topics in Power Electronics
Volume	5
Issue number	4
Early online date	14 Aug 2017
DOIs	https://doi.org/10.1109/JESTPE.2017.2739424
Publication status	Published - Dec 2017

Bibliographical note

10.13039/501100000266-Engineering and Physical Sciences Research Council

Keywords

Active-forced-commutated (AFC) bridge
dc-link voltage reversal
front-to-front (F2F) DC-DC converter
high-efficiency voltage source converter (VSC)
insulated-gate bipolar transistor (IGBT)
line-commutated-converter (LCC) and VSC hybrid HVDC grid
thyristor

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10.1109/JESTPE.2017.2739424Licence: Unspecified

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Accepted author manuscript, 2.07 MBLicence: Other

Cite this

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

abstract = "The active-forced-commutated (AFC) bridge employs a symmetrical thyristor-bridge with auxiliary self-commutated full-bridge chain-link 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. Thus, the AFC-bridge is compatible with both line-commutated-converter (LCC) and VSC terminals in a multiterminal high-voltage direct current network. This paper investigates its front-to-front (F2F) dc-dc application for matching the regional dc grids in an LCC and VSC hybrid HVDC network. Simulation studies are carried out to demonstrate its potentials as a high-efficiency multifunctional solution for dc-dc conversion.",

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AU - Holliday, Derrick

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AB - The active-forced-commutated (AFC) bridge employs a symmetrical thyristor-bridge with auxiliary self-commutated full-bridge chain-link 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. Thus, the AFC-bridge is compatible with both line-commutated-converter (LCC) and VSC terminals in a multiterminal high-voltage direct current network. This paper investigates its front-to-front (F2F) dc-dc application for matching the regional dc grids in an LCC and VSC hybrid HVDC network. Simulation studies are carried out to demonstrate its potentials as a high-efficiency multifunctional solution for dc-dc conversion.

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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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Keywords

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