Impact of phase‐locked loop on small‐signal dynamics of the line commutated converter‐based high‐voltage direct‐current station
Bibliographic record
Abstract
This study investigates the impact of phase‐locked loop (PLL) and DC‐side voltage controller on small‐signal dynamics of the high‐voltage direct‐current (HVDC) inverter station system which utilises line commutated converter (LCC) technology. The studies are conducted based on eigenanalysis of a linearised model of a study system and verified by time‐domain simulation studies in the PSCAD platform. The studies show that under weak grid conditions, e.g. short‐circuit ratio (SCR) = 1, parameters of PLL and DC‐side voltage controller of the LCC‐HVDC station can highly impact the damping of the oscillatory modes and even cause instability. The studies also show that the voltage control parameters can be selected to prevent PLL‐induced instability. The studies also (i) show that maximum available power and critical SCR are highly affected by PLL and DC‐side voltage control and (ii) propose a procedure to systematically determine these indices.
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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 | 0.000 | 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 | 0.000 |
| 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 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".