Modified Phase-disposition PWM Technique for Modular Multilevel Converters
Bibliographic record
Abstract
Modular multilevel converters (MMCs) are considered to be a suitable candidate to improve the energy conversion efficiency and fault tolerant ability of electric propulsion systems. These converters offer advantages such as modularity, low harmonic contents, high availability, lower electro-magnetic interface and no bulk dc-link capacitors. Phase-shifted pulse width modulation (PS-PWM) is a natural PWM method for MMCs as it ensures even power distribution and equal switching frequency on submodules (SM). However, this technique suffers from lack of waveform quality and optimal switching. In contrast, phase-disposition PWM (PD-PWM) technique ensures better voltage profile and lack of even power distribution. A modified rotative PD-PWM (MPD-PWM) technique is proposed in this paper, to overcome the problem of uneven power distribution. Moreover, a common mode voltage is injected to PWM modulator, which decreases the switching transitions and increases the fundamental voltage. The key performance of each PWM scheme for half bridge submodule (HB-SM) based three-phase MMC (4 SMs per arm) are holistically evaluated by simulations in PLECS software.
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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 | 0.000 |
| 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) | 0.002 | 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 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".