A power switch open‐circuit fault‐tolerant scheme using dc current injection for dual active bridge converters in cascaded h‐bridge solid‐state transformer
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Bibliographic record
Abstract
Abstract Due to its excellent modularity and scalability, the cascaded H‐bridge solid‐state transformer (CHB SST) is a prominent candidate for interconnecting different grids in future hybrid ac/dc distribution systems. However, the CHB SST's large number of power switches are potential sources of faults that can disrupt the system's normal operation. Among other failure modes, a power switch open‐circuit fault (OCF) in a dual active bridge (DAB) module in the SST can result in overcurrent and previously ignored DAB high‐frequency transformer (HFT) saturation issues. The fault is generally addressed by installing redundant modules or additional devices, which would increase the cost, size, and complexity of the system. Based on the OCF analysis presented in this paper, a fault‐tolerant scheme using dc current injection and phase shift ratio adjustment is proposed to maintain the CHB SST operation with maximum remaining bidirectional power transfer capability of the faulty DAB. The overcurrent and HFT saturation issues are also eliminated. The proposed scheme features less cost and volume as compared with module redundancy methods. Moreover, it does not require modifications in the configuration and implementation of the SST. The feasibility and effectiveness of the proposed scheme are verified through a 4.8 kVA CHB SST experimental platform.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it