Electromagnetic transient simulation of CIGRÉ DC grid test system with hybrid converter topologies
Bibliographic record
Abstract
Voltage source converter (VSC) based HVDC projects are being increasingly built and operated globally, providing the potential to construct a meshed DC supergrid. The CIGRÉ DC grid test system is a benchmark for research and analysis with power system topologies and parameters. This paper presents the electromagnetic transient simulation using detailed switching devices for the complete test system modeling composed of multiple converter topologies, including two-level (2L) converters, three-level neutral-point-clamped (3LNPC) converters, modular multi-level converters (MMCs) with up to 401 levels, and four-quadrant (4Q) DC-DC converters in PSCAD/EMTDC®. This paper proposes the scheme to combine the piecewise linearized tangential curve fitting of IGBT and diode characteristics with the Thévenin equivalence based MMC modeling scheme to increase the accuracy, which can also present the power losses of the IGBT modules. Dynamic analyses, including AC and DC faults, are conducted presenting the results from various converter stations.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".