Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit Failure
The three-phase dual-active-bridge (3p-DAB) converter possesses inherent fault-tolerant capability to address open-circuit failures (OCFs). The frozen leg method tackles OCFs without additional hardware by disabling the two switches in the faulty leg, allowing the 3p-DAB to transfer reduced power, g...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
|
| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10833606/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The three-phase dual-active-bridge (3p-DAB) converter possesses inherent fault-tolerant capability to address open-circuit failures (OCFs). The frozen leg method tackles OCFs without additional hardware by disabling the two switches in the faulty leg, allowing the 3p-DAB to transfer reduced power, generally by maintaining the original phase shift angle. However, prior literature on the frozen leg method focused only on operation with phase shift angles from 0 to <inline-formula> <tex-math notation="LaTeX">$\pi/3$ </tex-math></inline-formula>. The power transfer characteristics beyond this range, specifically from <inline-formula> <tex-math notation="LaTeX">$\pi/3$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$\pi/2$ </tex-math></inline-formula>, have not been explored in the literature. To address this gap, this paper derives novel equations to describe the transferred power of a 3p-DAB operating with frozen leg control over the phase shift range of <inline-formula> <tex-math notation="LaTeX">$\pi/3$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$\pi/2$ </tex-math></inline-formula>. These equations show for the first time that the theoretical maximum power transfer during frozen leg operation is 75.6% of the normal operation maximum power transfer. Further, based on the derived curves, this paper proposes a method to increase power transfer of the frozen leg method by dynamically adjusting the phase shift angle, which would not be possible without the full power transfer curve from 0 to <inline-formula> <tex-math notation="LaTeX">$\pi/2$ </tex-math></inline-formula>. The soft-switching analysis for the proposed method is also presented. The theoretical analysis and proposed method are validated through extensive experimental testing. |
|---|---|
| ISSN: | 2169-3536 |