Impedance-based Approach for High Frequency Interaction Analysis of MMC Systems
Bibliographic record
Abstract
Modular Multi-level Converter (MMC) and its Valve Base Controller (VBC) are generally provided by one manufacturer. MMC and VBC operate together with ac network, dc system, and Pole Controller and Protection (PCP) system. Therefore, the MMC system is potential to interact with any of these parts in a wideband frequency range. This paper focuses on the interaction between the MMC system and the PCP system. By using a frequency scanning approach for the CIGRE DCSI MMC one terminal case, the MMC system admittance characteristic is obtained firstly in RTDS simulation. Then the closed-loop stability of the MMC system and PCP control system is analyzed through Bode Plot. With the designed DCSI MMC system, the larger gains of the inner-loop PI controller are the root causes of high frequency interaction between the MMC system and PCP control system. Finally, the conclusion is validated in RTDS time domain simulation.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".