A New Conceptual Design and Dynamic Analysis of a Spar-Type Offshore Wind Turbine Combined with a Moonpool
Abstract
:1. Introduction
2. Model Descriptions
3. Design Process
3.1. Hydrostatic Optimization
3.2. Hydrodynamic Optimization
3.3. Fully Coupled Hydro-Aero-Servo-Elastic Dynamic Optimization
4. Results
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | Unit | Value |
---|---|---|
Design Water Depth | m | 150 |
Wind Turbine Rated Power | MW | 5 |
Hub Height | m | 90 |
Cut-In, Rated, and Cut-Out Wind Speeds | m/s | 3, 11.4, 25 |
Rotor Mass | kg | 110,000 |
Nacelle Mass | kg | 240,000 |
Tower Mass (for offshore) | kg | 249,718 |
Vertical Center of Mass (CM) of Wind Turbine (Rotor, Nacelle, and Tower) | m | 70.34 |
Parameter | Unit | Value |
---|---|---|
Number of Mooring Lines | - | 3 |
Angle Between Adjacent Lines | Degree | 120 |
Depth to Anchors Below Sea Water Level (SWL) (Water Depth) | m | 150 |
Depth to Fairleads Below SWL | m | 41 |
Distance from Fairlead to Anchor | m | 939 |
Unstretched Mooring Line Length | m | 970 |
Mooring Chain Common Link Diameter | mm | 90 |
Mooring Line Mass Density in Air | kg/m | 178 |
Mooring Line Weight in Water (μ) | N/m | 1518.8 |
Mooring Line Extensional Stiffness | MN | 729.0 |
Minimum Breaking Load (MBL) | MN | 6.65 |
Total Weight Effect of Three Mooring Lines in Static Condition | kgf | 120,946 |
Item | DLC 1.1 | DLC 1.6a | DLC 6.1a |
---|---|---|---|
Wind | NTM | NTM | EWM |
Waves | NSS | SSS | ESS |
Wind and wave directionality | 0°, COD | 0°, COD | 0°, COD, Yaw ±8°, 0° |
Current | NCM | NCM | ECM |
Wind turbine status | Operation | Operation | Parked, blades:90° |
Sea State | Mean Wind Speed at Hub (m/s) | Irregular Wave | Current Speed (m/s) | |
---|---|---|---|---|
Hs (m) | Tp (s) | |||
1 | 4 | 0.78 | 6.20 | 0.37 |
2 | 6 | 0.78 | 6.20 | 0.37 |
3 | 8 | 0.80 | 6.22 | 0.37 |
4 | 10 | 0.94 | 6.32 | 0.37 |
5 | 12 | 1.60 | 6.83 | 0.37 |
6 | 14 | 2.26 | 7.34 | 0.37 |
7 | 16 | 2.92 | 7.85 | 0.37 |
8 | 18 | 3.58 | 8.36 | 0.37 |
9 | 20 | 4.25 | 8.87 | 0.37 |
10 | 22 | 4.91 | 9.38 | 0.37 |
11 | 24 | 5.57 | 9.89 | 0.37 |
12 | 39.5 | 11.57 | 14.52 | 1.63 |
Model/Parameter | Displacement | h | d1 | d2 | d | Platform Mass | Platform CM |
---|---|---|---|---|---|---|---|
(m3) | (m) | (m) | (m) | (m) | (Ton) | (m) | |
M1 | 7627.55 | 100.00 | 11.93 | 14.22 | 10.00 | 7097.33 | −79.63 |
M2 | 8430.45 | 85.00 | 11.93 | 15.34 | 10.00 | 7920.31 | −69.22 |
M3 | 9634.80 | 70.00 | 11.93 | 17.12 | 10.00 | 9154.77 | −58.26 |
M4 | 11,240.60 | 55.00 | 11.93 | 19.98 | 10.00 | 10,800.71 | −46.74 |
M5 | 7627.55 | 100.00 | 8.85 | 11.75 | 6.00 | 7097.33 | −81.56 |
M6 | 8430.45 | 85.00 | 8.85 | 13.09 | 6.00 | 7920.31 | −70.45 |
M7 | 9634.80 | 70.00 | 8.85 | 15.14 | 6.00 | 9154.77 | −58.99 |
M8 | 11,240.60 | 55.00 | 8.85 | 18.33 | 6.00 | 10,800.71 | −47.15 |
M9 | 7627.55 | 100.00 | 6.80 | 10.30 | 2.00 | 7097.33 | −82.71 |
M10 | 8430.45 | 85.00 | 6.80 | 11.81 | 2.00 | 7920.31 | −71.18 |
M11 | 9634.80 | 70.00 | 6.80 | 14.06 | 2.00 | 9154.77 | −59.43 |
M12 | 11,240.60 | 55.00 | 6.80 | 17.46 | 2.00 | 10,800.71 | −47.40 |
Natural Frequencies | Unit | M1 | M5 | M9 | OC3-Hywind | ||||
---|---|---|---|---|---|---|---|---|---|
Cal. | Sim. | Cal. | Sim. | Cal. | Sim. | Cal. | Sim. | ||
Surge | Hz | - | 0.006 | - | 0.007 | - | 0.008 | - | 0.0085 |
Heave | Hz | 0.032 | 0.032 | 0.032 | 0.032 | 0.033 | 0.033 | 0.032 | 0.033 |
Pitch | Hz | 0.023 | 0.021 | 0.029 | 0.027 | 0.033 | 0.035 | 0.033 | 0.032 |
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Pham, T.D.; Shin, H. A New Conceptual Design and Dynamic Analysis of a Spar-Type Offshore Wind Turbine Combined with a Moonpool. Energies 2019, 12, 3737. https://doi.org/10.3390/en12193737
Pham TD, Shin H. A New Conceptual Design and Dynamic Analysis of a Spar-Type Offshore Wind Turbine Combined with a Moonpool. Energies. 2019; 12(19):3737. https://doi.org/10.3390/en12193737
Chicago/Turabian StylePham, Thanh Dam, and Hyunkyoung Shin. 2019. "A New Conceptual Design and Dynamic Analysis of a Spar-Type Offshore Wind Turbine Combined with a Moonpool" Energies 12, no. 19: 3737. https://doi.org/10.3390/en12193737
APA StylePham, T. D., & Shin, H. (2019). A New Conceptual Design and Dynamic Analysis of a Spar-Type Offshore Wind Turbine Combined with a Moonpool. Energies, 12(19), 3737. https://doi.org/10.3390/en12193737