Control of Regenerative CHB Motor Drives at Fundamental Switching Frequency
Bibliographic record
Abstract
To handle the high-power regeneration power in coal and mine industry applications, the regenerative version of the cascaded H-bridge (CHB) drives is made possible by replacing the diode-front-end rectifier with a three-phase IGBT-based active-front-end (AFE) rectifier in each power cell. However, the IGBT switching devices introduce extra switching losses to the system that must be properly handled due to the thermal constraints in high power medium voltage drive applications. In this article, a novel fundamental switching frequency control strategy is proposed for the AFEs in the regenerative CHB drive. With the proposed control strategy, the main harmonic contents generated by the AFEs are well-reshaped at a low-order harmonics range which can be further eliminated by the existing front-end phase-shifting transformer. This allows accomplishing the meeting of the IEEE std 519-2014 at the fundamental switching frequency <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sw</sub> = 60. Moreover, with the proposed switching pattern, IGBTs can be turned <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> at zero current and therefore it can reduce switching losses simultaneously. The feasibility of the proposed control strategy is verified by experimental results on a seven-level regenerative CHB drive, which can be extended to regenerative CHB drives with any voltage levels.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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) | 0.001 | 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 teacher head, 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".