Control of the Current Shaping MMC to Enable High Step-down AC/DC Power Conversion
Bibliographic record
Abstract
This thesis introduces a new control strategy for the Current Shaping Modular Multilevel Converter (CS-MMC), a recently proposed DC/DC converter intended for medium voltage applications. This new control formulation allows the same CS-MMC to accommodate a vastly wider range of input voltages while also reducing the output current ripple. Experimental results are presented using a 1 kW laboratory scale prototype. It is then shown that this introduced control strategy enables the CS-MMC to also accommodate AC input voltages. To achieve this, the topology must be slightly modified, with the new topology termed the AC/DC CS-MMC. While the CS-MMC is intended for the future DC grid, the AC/DC CS-MMC can be powered from existing AC distribution feeders. Simulation results for a 10 kW system are presented. The input current distortion is shown to be in compliance with the IEEE 519-2014 standard.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 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) | 0.029 | 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".