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...
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2025-01-01
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| author | Cun Wang Jennifer Bauman |
| author_facet | Cun Wang Jennifer Bauman |
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| description | 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. |
| format | Article |
| id | doaj-art-c3a3ba2532b044b9903bbbd8e453c3f4 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
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| spelling | doaj-art-c3a3ba2532b044b9903bbbd8e453c3f42025-01-15T00:03:01ZengIEEEIEEE Access2169-35362025-01-01137323733710.1109/ACCESS.2025.352720110833606Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit FailureCun Wang0https://orcid.org/0000-0002-6859-3661Jennifer Bauman1https://orcid.org/0000-0002-9923-4194Department of Electrical and Computer Engineering, McMaster University, Hamilton, ON, CanadaDepartment of Electrical and Computer Engineering, McMaster University, Hamilton, ON, CanadaThe 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.https://ieeexplore.ieee.org/document/10833606/DC-DC power conversionreliabilityfault tolerancecircuit analysis |
| spellingShingle | Cun Wang Jennifer Bauman Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit Failure IEEE Access DC-DC power conversion reliability fault tolerance circuit analysis |
| title | Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit Failure |
| title_full | Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit Failure |
| title_fullStr | Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit Failure |
| title_full_unstemmed | Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit Failure |
| title_short | Full Range Analysis and Application of Frozen Leg Operation for 3-Phase DAB Converters With Open-Circuit Failure |
| title_sort | full range analysis and application of frozen leg operation for 3 phase dab converters with open circuit failure |
| topic | DC-DC power conversion reliability fault tolerance circuit analysis |
| url | https://ieeexplore.ieee.org/document/10833606/ |
| work_keys_str_mv | AT cunwang fullrangeanalysisandapplicationoffrozenlegoperationfor3phasedabconverterswithopencircuitfailure AT jenniferbauman fullrangeanalysisandapplicationoffrozenlegoperationfor3phasedabconverterswithopencircuitfailure |