Frozen leg operation of a three-phase dual active bridge DC/DC converter at light loads

Haghbin, Saeid; Blaabjerg, Frede; Yazdani, Farzad; Bahman, Amir Sajjad

doi:10.1109/apec.2018.8341589

Cited by 1 publication

(2 citation statements)

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“…11 for a normal operation mode and a frozen leg condition, subsequently. Table I and Table II show the output currents for normal operation mode and frozen leg operation mode [14]. Table III and Table IV show the output currents for normal operation mode and frozen leg operation mode.…”

Section: Verification At Light Loadsmentioning

confidence: 99%

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

Haghbin

Blaabjerg

Bahman

2019

IEEE Trans. Power Electron.

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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 highefficiency 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 undervoltage, 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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Section: Verification At Light Loadsmentioning

confidence: 99%

“…By decomposing the transformer current into the normal and deviated from the normal values, the analysis is performed to calculate the fault current. Consequently, the converter power is calculated at light loads [14].…”

Section: Introductionmentioning

confidence: 99%