A Bidirectional Current-Fed Isolated MMC with Zero-Current Switching for High Step Ratio DC-DC Applications
Bibliographic record
Abstract
To effectively integrate distributed energy resources and non-traditional loads into the grid, medium-voltage direct current (MVDC) systems have gained attention in recent years. A key enabling technology for MVDC distribution is high step ratio dc-dc converters with bidirectional capability, performing a role similar to ac distribution transformers. The current shaping modular multilevel converter (CS-MMC) has been proposed for this type of application because of its ability to operate at high-effective frequencies by eliminating internal string inductors, thereby minimizing module capacitance, size, and cost. Until now, published CS-MMC work has focused on unidirectional, voltage-fed operation. To enable bidirectional operation, a novel current-fed operational approach is proposed in this paper that is fundamentally different from earlier works. The circuit topology, operating principles, and experimental results are presented. A peak measured efficiency of 95.8% is achieved when transferring 2.2 kW from 100V to 1kV for a 6 module, 2.7 kW, 1kV/100V prototype.
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How this classification was reachedexpand
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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".