Frozen Leg Operation of a Three-Phase Dual Active Bridge Converter

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Three-phase dual active bridge (DAB) topology is a potential alternative for high-power applications when a compact and efficient converter with a bidirectional power transfer capability is desired. In a constructed prototype high-power SiC modules with dedicated drivers are utilized to achieve high-efficiency and compact size. Each module has two interconnected switches with anti-parallel diodes resembling a converter leg. It is observed that the driver halts the module operation as a result of protective actions such as over-current, gate under-voltage, or gate over-voltage. In this frozen leg mode, the module operates as a leg with two diodes until an external hardware signal resets the driver. The converter continues operation but with a reduced performance. Analysis, simulation and verification of a three-phase DAB converter under a frozen leg operation are considered in this paper. The converter with a frozen leg has two different behaviours at light loads and heavy loads. Consequently, two different analysis methods are developed to solve converter operation in different load conditions. Results show that the power transfer capability is reduced, but this fault mode is non-destructive.
OriginalsprogEngelsk
TidsskriftIEEE Transactions on Power Electronics
Vol/bind34
Udgave nummer5
Sider (fra-til)4239 - 4248
Antal sider10
ISSN0885-8993
DOI
StatusUdgivet - maj 2019

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abstract = "Three-phase dual active bridge (DAB) topology is a potential alternative for high-power applications when a compact and efficient converter with a bidirectional power transfer capability is desired. In a constructed prototype high-power SiC modules with dedicated drivers are utilized to achieve high-efficiency and compact size. Each module has two interconnected switches with anti-parallel diodes resembling a converter leg. It is observed that the driver halts the module operation as a result of protective actions such as over-current, gate under-voltage, or gate over-voltage. In this frozen leg mode, the module operates as a leg with two diodes until an external hardware signal resets the driver. The converter continues operation but with a reduced performance. Analysis, simulation and verification of a three-phase DAB converter under a frozen leg operation are considered in this paper. The converter with a frozen leg has two different behaviours at light loads and heavy loads. Consequently, two different analysis methods are developed to solve converter operation in different load conditions. Results show that the power transfer capability is reduced, but this fault mode is non-destructive.",
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Frozen Leg Operation of a Three-Phase Dual Active Bridge Converter. / Haghbin, Saeid; Blaabjerg, Frede; Bahman, Amir Sajjad.

I: IEEE Transactions on Power Electronics, Bind 34, Nr. 5, 05.2019, s. 4239 - 4248.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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