Operation of MMC-Based VSC-HVDC System Under Geomagnetic Disturbance
Bibliographic record
Abstract
This paper presents a novel analysis of the performance of an MMC-based HVDC system in the presence of a solar storm. The detailed models of an MMC and SMs are used to acquire the accurate behavior of the MMC during the GIC. The analysis demonstrates that the current harmonics arising from the DC shift in the transformer flux are distributed between the MMC and grid. A model for the distribution of the current harmonics is introduced. It is revealed that the distribution of the 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> harmonic of the current is affected not only by the MMC impedance but also by the output current and voltage of the converter as well. Also, due to the unity power factor strategy in the control system of the MMC, the converter does not respond to the increase in reactive power consumption by the transformer. Consequently, a control scheme is proposed to minimize the contribution of the grid in the reactive power augment. This control scheme provides the saturated transformer with the reactive power injected by MMC. The system is implemented in EMTP-RV, and the proficiency of the proposed control scheme is verified through simulation.
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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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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".