Impacts of Mooring Line Lengthening on Position Controller Design for a Floating Offshore Wind Turbine
Bibliographic record
Abstract
This paper presents how longer mooring lines impact the ability to command a Floating Offshore Wind Turbine (FOWT) to a desired position. This starts with an analysis of the asymmetrical platform motions that are magnified by the longer mooring lines. These asymmetrical platform motions are most notable when comparing motion in the positive and negative sway directions. These asymmetries are caused by the rotor gyroscopic torque and generator reaction torque, and the combined effects of wind shear, rotor yaw direction, blade pitch and rotor rotation direction. These asymmetries cause differences in motion dependent on the direction of the commanded position. The asymmetries appear as an ineffectiveness of position control when positive sway movement is commanded. Then a position controller is designed to address some of these asymmetries, and to highlight the impacts of the asymmetries which cannot be mitigated with the proposed controller structure. The position controller is designed as a Proportional-Derivative (PD) controller to control the FOWT position perpendicular to the wind direction by manipulating only nacelle yaw. The results demonstrate that, except at especially high wind speeds with FOWT motion in the positive direction, the controller is able to control the FOWT to a commanded position. At high wind speeds, the asymmetries of the system with respect to nacelle yaw direction become too large to be overcome. The recommendations for position control design are to include platform rotational degrees of freedom in all control design models, to explicitly account for platform yaw in the controller design and to have the wind farm supercontroller account for wind-shear based asymmetries.
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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 | 0.000 |
| 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".