A Bidirectional Current-Fed Isolated MMC With Partial Soft-Switching for High Step Ratio DC–DC Applications
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Medium-voltage direct current (MVDC) systems offer many advantages in a future of renewables and dc loads including reducing the number of required power conversion stages. An enabling technology for MVDC distribution systems will be high step ratio dc-dc converters with bidirectional power transfer 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. This converter family operates at high effective frequencies, enabled by the elimination of internal string inductors. While foundational work on the CS-MMC focused on unidirectional, voltage-fed operation, recent work has demonstrated the bidirectional capabilities of the CS-MMC when operated as a current-fed converter driven by the low-voltage side. This paper proposes an improved modulation for the bidirectional CS-MMC that (i) ensures zerovoltage switching (ZVS) of the secondary-side switches in forward operation and (ii) minimizes the reverse body diode conduction time to improve efficiency. This paper is also the first to detail a balancing mechanism between the VSM strings and between the dc-blocking capacitors of the bidirectional CS-MMC. Peak measured efficiencies of 97.0% in forward operation and 96.3% in reverse operation are achieved for a 6 module, 3 kW, 1kV/100V prototype
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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