An on-line operated unity power factor PWM rectifier for AC drive applications
Bibliographic record
Abstract
In order to minimize their impact on the AC supply, AC drives often require an input rectifier stage with low input current harmonics and high input power factor. High efficiency is also desirable. Drawbacks of the conventional off-line operated PWM rectifiers include slow transient response, load dependent input power factor and the need for damping resistors to avoid harmonic amplification and current oscillations, particularly under transient conditions. In this paper, an on-line operated PWM rectifier with inherent damping and pattern synchronization with the AC mains is proposed. Since the modulation scheme uses the voltages across the input filter capacitors as templates, faster transient response is achieved under normal and starting conditions and the need of the damping resistors is eliminated. Moreover, an additional phase-shifting circuit is used in the control scheme to achieve unity power factor, independently of the DC link current variations. The paper includes analysis and design guidelines for the rectifier control circuit. Experimental results on a 1 kVA laboratory prototype confirm the feasibility of the proposed control structure.>
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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 | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.003 |
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".