Double-Pulsing Reflected Wave Overvoltage Oscillation Suppression in Long-Cable VSI Motor Drives Induced by Narrow PWM Pulses
Bibliographic record
Abstract
In the voltage source inverter (VSI)-fed motor drive system equipped with long cable connection, the differential reflected wave overvoltage (RW-OV) at AC motor terminals can typically reach a maximum of 2 per unit (pu) of the DC bus voltage when a single rising/falling switching is applied to an uncharged cable. However, under certain conditions, such as low-speed operation, the frequent narrow pulse-width-modulation (PWM) pulses will lead to the double-pulsing phenomenon, where the latest switching occurs while the voltage oscillation caused by the previous one has not fully decayed. This results in a differential RW-OV oscillation with an amplitude over 3 pu, which challenges the insulation capability of the motor and aggravates high-frequency electromagnetic interference (EMI) issues. Unfortunately, most solutions merely resort to passive ways to avoid this issue, i.e., either directly abandoning narrow PWM pulses below a minimum dwell time or extending their duration to allow prior voltage oscillations to decay. Therefore, the line-to-line double-pulsing RW-OV in three-phase motor drives has been insufficiently researched. This paper proposes a real-time duty-cycle-offset (RT-DCO) strategy that dynamically rotates which phase carries the maximum duty cycle and applies interleaved offsets to the other two phases, actively mitigating double-pulsing RW-OV behavior by leveraging residual oscillatory components to suppress subsequent voltage fluctuations while maximizing volt-second balance. Simulation and experimental results demonstrate the effectiveness of the proposed RT-DCO method in suppressing three-phase double-pulsing RW-OV oscillations.
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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 | 0.001 |
| 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".