A discontinuous PWM scheme for lowering the switching frequency and losses in a 3-phase 6-switch 3/5-level PWM VSI using a 3-limb inductor
Bibliographic record
Abstract
Standard interleaved 3-level pwm schemes used in multilevel 3-phase inverters such as the NPC are shown not to be suitable for multi-level inverters using a 3-limb coupled inductor. This paper illustrates how a standard discontinuous 3-level pwm scheme can be modified to provide an appropriate excitation for a 3/5 level 6-switch coupled inductor inverter (CII). The pwm reference signals and switching patterns are chosen to excite the inductor phase windings so that only 3 high permeability flux paths in the inductor core are used. As a result, the high frequency current ripple in the inductor windings are reduced together with the high frequency flux produced in the core. The resultant inverter operation can be operated at much lower switching frequencies (2-8 kHz), and levels that are more suitable for standard industrial applications. Experimental results illustrate that the new pwm scheme improves the efficiency of the inverter and lowers the power losses in the coupled inductor. The lower inductor losses also means that the physical size of the coupled inductor can be reduced. Experimental and simulated results are used to demonstrate the operation of the new pwm scheme using a variable speed inverter drive.
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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 | 0.001 |
| 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".