Harmonic Distortion and Power Efficiency Investigation in 7-Level Converter: New Scalar Modulation Approach
Bibliographic record
Abstract
This paper proposes a new pulse width modulation (PWM) approach aimed at improving the harmonic content and power losses performance of a 7-level cascaded Hbridge converter (CHB). The carrier-based modulation is based on a variation of the carrier amplitude in a sawtooth shape. The assessment of this approach relies on a comparative performance analysis with conventional modulation schemes. Many methods have focused on the arrangement, shape, or frequency of the carrier signals. However, the approach investigated in this work aims to examine the effect of varying the amplitudes of the carriers. The paper is based on an analytical study of this approach and culminates in numerical validation via PLECS simulation platform, including a comparative analysis of power losses, the harmonic spectrum, and total harmonic distortion (THD) in current and voltage in open loop. Although the open loop study provides a comprehensive evaluation across different operating points, it precedes a closed loop evaluation of the various modulation strategies investigated, such as level shift PWM (LSPWM) and phase shift (PSPWM).
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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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".