A Partial Power Processing MMC Topology for Direct AC/AC Power Conversion
Bibliographic record
Abstract
A new class of modular multilevel ac/ac converter (M2AC) is presented that allows the direct conversion of ac power between different voltage levels in single frequency power systems using half-bridge submodules. The M2AC is a partial power processing topology that exploits internal circulating dc currents to facilitate the charge balance of the submodule capacitors. A comparison with the conventional back-to-back modular multilevel ac/ac converter shows the M2AC can realize significant reductions in submodule requirements. The working principle of the M2AC and its partial power processing mechanism is discussed in detail. A dynamic controller is proposed that includes output current regulation and capacitor voltage balancing. The M2AC operation and controls are validated by simulation, and experimental results for a 135/67 Vrms, 0.8 kW prototype confirm efficacy of the partial power processing mechanism. Potential applications of the M2AC include voltage regulators in distribution and transmission systems, and deployment as part of power flow controllers.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".