High-frequency six pulse DC link based bidirectional three-phase inverter without intermediate decoupling capacitor
Bibliographic record
Abstract
Cascaded bidirectional dc-ac converters are commonly used in UPS application and battery chargers for electric vehicles (EV). A bidirectional dual active bridge cascaded three phase converter (DABCC) with six pulse dc link, high reliability and low cost is proposed for applications like line interactive UPS and EV. Power conversion units for such applications use large electrolytic capacitor at high voltage DC bus. Through a novel modulation technique Six Pulse Modulation (SPM), this electrolytic capacitor is eliminated that results in increased reliability, compactness and reduced cost. It needs only single H-bridge and one single-phase transformer at front-end for the required three-phase conversion. SPM technique also increases DC bus utilization and decreases the inverter average switching frequency to 33% when compared to traditional sine PWM. To effectively implement the SPM modulation, a fast dynamic control of dc link voltage is required. For that a coordinated control is implemented. And also the effect of dead time on the inverter terminal voltage for a SPM modulated converter is analyzed and its effect on terminal voltage is presented. To mitigate this effect, a compensation technique based on resonant control is proposed. RMS current stress for high voltage dc link capacitor is studied and it is shown that the capacitor requirement for SPM modulation is lower than the conventional Sine Pulse Width Modulation (SPWM). To validate the proposed control scheme, a 800 W prototype is fabricated. Hardware results are presented to show the effectiveness of the implemented control scheme.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".