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研究生： 陳乃齊
Chen, Nai-Chi
論文名稱： 浮式風機之複合式繫纜系統非線性剛度模型之應用研究
Nonlinear Stiffness Modeling for Hybrid Mooring Systems of Floating Offshore Wind Turbine
指導教授： 楊瑞源
Yang, Ray-Yeng
學位類別： 碩士
Master
系所名稱： 工學院 - 水利及海洋工程學系
Department of Hydraulic & Ocean Engineering
論文出版年： 2024
畢業學年度： 112
語文別： 英文
論文頁數： 94
中文關鍵詞： 浮動式風機 、複合式繫纜系統 、合成纖維繫纜 、疲勞分析 、非線性剛度模型 、Syrope模型
外文關鍵詞： Floating wind turbine, hybrid mooring system, synthetic fiber rope, fatigue analysis, nonlinear stiffness model, Syrope model
相關次數： 點閱：158  下載：2 
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    • 為因應全球淨零碳排目標，離岸風電已成為全球能源轉型的重要發展產業。截至 2023 年，台灣的離岸風力發電已完成 2.25 GW 的建設，未來近岸固定式風場將逐漸趨於飽和，為進一步拓展離岸風電版圖，將目光轉向水深 50 至 100 公尺的深海區域，發展浮動式風力發電。考量到台灣淺海域的特性，複合式繫纜系統因其能有效降低繫纜張力及成本之潛力，成為浮式風機繫纜系統設計的重要選項。
    本研究以半潛式浮式平台搭載 15 MW 風機為對象，利用 Ansys Aqwa 和 Orcina OrcaFlex 軟體建立數值模型，以純鏈繫纜系統為基準，並比較不同合成纖維（聚酯、尼龍）及長度組合對繫纜系統性能的影響。
    研究中先進行參數敏感度分析，在環境敏感度分析結果確定了0 度時承受最大載荷。以此為基礎，探討了合成纖維的不同剛度模型對繫纜張力和浮台動態的影響。本研究比較了線性、上下限法、準靜態及 Syrope 四種剛度模型。模擬結果表明，準靜態模型在兼顧模擬計算效率的同時，能展現合成纖維的非線性伸縮行為。
    為了評估複合式繫纜系統在實際海域中的性能，本研究以台灣新竹外海作為研究場址，並進行了極限狀態和疲勞分析。極限狀態分析結果顯示，在 50 年回歸週期海況下，所有複合式繫纜系統均滿足設計規範。相較於純鏈繫纜系統，複合式繫纜系統有效降低了繫纜最大張力，但增加了浮台的漂移距離。疲勞分析結果則顯示，繫纜的疲勞損傷與風機推力密切相關，在額定風速下，繫纜的單位時間疲勞累積量達到最大值。

    In response to global net-zero carbon emission goals, offshore wind power has become a pivotal industry in the global energy transition. As of 2023, Taiwan has completed the construction of 2.25 GW of offshore wind power capacity. With nearshore fixed wind farms approaching saturation, there is a shift towards developing floating wind power in deeper waters ranging from 50 to 100 meters. Given the characteristics of Taiwan's shallow marine areas, hybrid mooring systems are emerging as a critical option for floating wind turbine mooring due to their potential to effectively reduce mooring tension and costs.
    This study focuses on a semi-submersible floating platform equipped with a 15 MW wind turbine, utilizing numerical models created in Ansys Aqwa and Orcina OrcaFlex software. The study uses a pure chain mooring system as a benchmark and compares the effects of different synthetic fibers (polyester, nylon) and their combinations on the performance of the mooring system.
    Initially, a parameter sensitivity analysis was conducted, and the results of the environmental sensitivity analysis identified zero degrees as the condition bearing the maximum load. Building on this, the study explored the impact of different stiffness models of synthetic fibers on the mooring tension and dynamics of the floating platform. The study compared linear, upper and lower bound method, quasi-static, and Syrope stiffness models. The simulation results indicate that the quasi-static model effectively demonstrates the nonlinear elongation behavior of synthetic fibers while maintaining computational efficiency.
    To assess the performance of the hybrid mooring system in actual marine conditions, this study selected the offshore area near Hsinchu, Taiwan, for its research site, and conducted limit state and fatigue analyses. The limit state analysis showed that all hybrid mooring systems meet the design specifications under 50-year return period sea conditions. Compared to the pure chain system, the hybrid mooring system significantly reduces the maximum tension in the moorings but increases the drift distance of the floating platform. The fatigue analysis results reveal that mooring fatigue damage is closely related to the thrust of the wind turbine, with the maximum cumulative fatigue occurring at rated wind speed.

    Abstract i 中文摘要 ii 誌謝 iii TABLE OF CONTENTS iv List of Table vi List of Figure viii Chapter 1 Introduction 1 1.1 Background and Motivation 1 1.2 Literature Review 2 1.3 Mooring System for Floating Wind Turbine 8 1.4 Mooring Material 12 1.5 Hybrid Mooring System for Floating Wind Turbines Projects Around the World 15 1.6 Objective and Scope 16 Chapter 2 Methodology 18 2.1 Analysis Procedure 18 2.2 Ansys Aqua 19 2.3 Orcina Orcaflex 25 2.4 Mooring Theory 27 2.5 Stress-Strain Models 29 2.6 Simulation Procedure of Hybrid Mooring Systems 32 2.7 Mooring Line Fatigue 33 2.8 Floating Wind Turbine Design Standards 34 3Chapter 3 Numerical Model Setup 38 3.1 Wind Turbine 38 3.2 Floater 39 3.3 Mooring System 41 3.4 Extreme Environmental Conditions 44 3.5 Normal Environmental Conditions 47 Chapter 4 Numerical results and discussion 50 4.1 Sensitivity Analysis 50 4.2 Free Decay Test 55 4.3 Static Offset Test 60 4.4 Regular Wave Test 60 4.5 Survival Simulation (ULS Condition) 62 4.6 Simulation under normal sea condition 69 Chapter 5 Conclusion and Suggestion 75 Reference 77

    1. Ma, Kai-Tung, et al. Mooring System Engineering for Offshore Structures. Gulf Professional Publishing, 2019.
    2. Yang, Ray-Yeng, et al. “Dynamic Response of an Offshore Floating Wind Turbine at Accidental Limit States—Mooring Failure Event.” Applied Sciences, vol. 12, no. 3, MDPI AG, Jan. 2022, p. 1525. Crossref, https://doi.org/10.3390/app12031525.
    3. Barooni, Mohammad, et al. “Floating Offshore Wind Turbines: Current Status and Future Prospects.” Energies, vol. 16, no. 1, MDPI AG, Dec. 2022, p. 2. Crossref, https://doi.org/10.3390/en16010002.
    4. Nielsen, Finn Gunnar, et al. “Integrated Dynamic Analysis of Floating Offshore Wind Turbines.” Volume 1: Offshore Technology; Offshore Wind Energy; Ocean Research Technology; LNG Specialty Symposium, ASMEDC, Jan. 2006. Crossref, https://doi.org/10.1115/omae2006-92291.
    5. Chitteth Ramachandran, Rahul, et al. “Floating wind turbines: marine operations challenges and opportunities.” Wind Energy Science, vol. 7, no. 2, Copernicus GmbH, Apr. 2022, pp. 903–24. Crossref, https://doi.org/10.5194/wes-7-903-2022.
    6. Home. 5 July 2023, bw-ideol.com/en.
    7. Edwards, Emma C., et al. “Evolution of floating offshore wind platforms: A review of at-sea devices.” Renewable and Sustainable Energy Reviews, vol. 183, Elsevier BV, Sept. 2023, p. 113416. Crossref, https://doi.org/10.1016/j.rser.2023.113416.
    8. Brown, David T. “Mooring Systems.” Handbook of Offshore Engineering, Elsevier, 2005, pp. 663–708. Crossref, https://doi.org/10.1016/b978-0-08-044381-2.50015-1.
    9. Niijjaawan, Neeraj, and Rasshmi Niijjaawan. “Steel wire and chain.” Modern Approach to Maintenance in Spinning, Elsevier, 2010, pp. 223–41. Crossref, https://doi.org/10.1533/9780857094056.223.
    10. Mooring ropes made of Dyneema manufactured by Lankhorst Ropes. www.lankhorstropes.com.
    11. Weller, S. D., et al. “Synthetic mooring ropes for marine renewable energy applications.” Renewable Energy, vol. 83, Elsevier BV, Nov. 2015, pp. 1268–78. Crossref, https://doi.org/10.1016/j.renene.2015.03.058.
    12. McKenna, H. A., et al. Handbook of Fibre Rope Technology. Elsevier, 2004.
    13. Pillai, A. C., et al. “Anchor loads for shallow water mooring of a 15 MW floating wind turbine—Part II: Synthetic and novel mooring systems.” Ocean Engineering, vol. 266, Elsevier BV, Dec. 2022, p. 112619. Crossref, https://doi.org/10.1016/j.oceaneng.2022.112619.
    14. Huang, Wei-Hua, and Ray-Yeng Yang. “Water Depth Variation Influence on the Mooring Line Design for FOWT within Shallow Water Region.” Journal of Marine Science and Engineering, vol. 9, no. 4, MDPI AG, Apr. 2021, p. 409. Crossref, https://doi.org/10.3390/jmse9040409.
    15. B.3 Mooring system | Guide to a floating offshore wind farm. guidetofloatingoffshorewind.com/guide/b-balance-of-plant/b-3-mooring-system.
    16. StackPath. www.offshore-mag.com/business-briefs/equipment-engineering/article/14172689/clump-weights-offer-sound-economical-mooring-system-option.
    17. Toan Tran, Thanh, et al. “Aerodynamic Interference Effect of Huge Wind Turbine Blades With Periodic Surge Motions Using Overset Grid-Based Computational Fluid Dynamics Approach.” Journal of Solar Energy Engineering, vol. 137, no. 6, ASME International, Sept. 2015. Crossref, https://doi.org/10.1115/1.4031184.
    18. 公布欄 - 最新消息與活動 - 經濟部能源署(Energy Administration, Ministry of Economic Affairs, R.O.C.)全球資訊網. www.moeaea.gov.tw/ECW/populace/news/Board.aspx?kind=3&menu_id=57&news_id=29297.
    19. Kyle Spearman, Dan, et al. “Floating Wind Joint Industry Project – Phase 2 summary report.” Carbon Trust, 2020.
    20. Renouvelables, Edf. EDF Renouvelables on LinkedIn: #operationréussie #eolienenmer #energiesrenouvelables #eoliennes #emr… | 31 comments. 11 Oct. 2023, www.linkedin.com/posts/edf-renouvelables_operationraezussie-eolienenmer-energiesrenouvelables-activity-7117904740356628480-BLOJ?utm_source=share&utm_medium=member_desktop.
    21. “New Reference Turbine Gives Offshore Wind an Upward Draft.” News | NREL, www.nrel.gov/news/program/2020/reference-turbine-gives-offshore-wind-updraft.html.
    22. Ikhennicheu, et al. “Review of the state of the art of mooring and anchoring designs, technical challenges and identification of relevant DLCs.” Corewind, D2.1, Corewind, Feb. 2020, corewind.eu/wp-content/uploads/files/publications/COREWIND-D2.1-Review-of-the-state-of-the-art-of-mooring-and-anchoring-designs.pdf. Accessed 3 Dec. 2023.
    23. Løvstad, et al. “Features of a Taut Leg Mooring System For Deep Water.” ISOPE International Ocean and Polar Engineering Conference, vol. ISOPE-I-95-029, June 1995.
    24. Johnsen, John Magne, and Ola Øritsland. “Design and Optimisation of Taut-Leg Mooring Systems.” All Days, OTC, May 1999. Crossref, https://doi.org/10.4043/10776-ms.
    25. ---. “Mooring Systems.” Handbook of Offshore Engineering, Elsevier, 2005, pp. 663–708. Crossref, https://doi.org/10.1016/b978-0-08-044381-2.50015-1.
    26. ---. Handbook of Fibre Rope Technology. Elsevier, 2004, books.google.ie/books?id=B_iiAgAAQBAJ&printsec=frontcover&dq=Handbook+of+fibre+rope+technology&hl=&cd=1&source=gbs_api.
    27. ---. “Synthetic mooring ropes for marine renewable energy applications.” Renewable Energy, vol. 83, Elsevier BV, Nov. 2015, pp. 1268–78. Crossref, https://doi.org/10.1016/j.renene.2015.03.058.
    28. Arramounet, Valentin, et al. “Design practices and guidelines for mooring, anchoring system design.” https://corewind.eu/, Apr. 2023, corewind.eu/wp-content/uploads/files/delivery-docs/D2.4.pdf. Accessed 3 Jan. 2024.
    29. Rentschler, Manuel U. T., et al. “Design optimization of dynamic inter-array cable systems for floating offshore wind turbines.” Renewable and Sustainable Energy Reviews, vol. 111, Elsevier BV, Sept. 2019, pp. 622–35. Crossref, https://doi.org/10.1016/j.rser.2019.05.024.
    30. Department, American Petroleum Institute. Exploration and Production. Recommended Practice for Design and Analysis of Stationkeeping Systems for Floating Structures. 1996, books.google.ie/books?id=H4HwAQAACAAJ&dq=API+RP+2SK&hl=&cd=1&source=gbs_api.
    31. Sobhaniasl, Mohsen, et al. “Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines.” Energies, vol. 13, no. 12, MDPI AG, June 2020, p. 3096. Crossref, https://doi.org/10.3390/en13123096.
    32. Thies, P. R., et al. “Assessing mechanical loading regimes and fatigue life of marine power cables in marine energy applications.” Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, vol. 226, no. 1, SAGE Publications, Oct. 2011, pp. 18–32. Crossref, https://doi.org/10.1177/1748006x11413533.
    33. Karlsen, Stian. “Fatigue of Copper Conductors for Dynamic Subsea Power Cables.” 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 6, ASMEDC, Jan. 2010. Crossref, https://doi.org/10.1115/omae2010-21017.
    34. GopiReddy, Lakshmi Reddy, et al. “Rainflow Algorithm-Based Lifetime Estimation of Power Semiconductors in Utility Applications.” IEEE Transactions on Industry Applications, vol. 51, no. 4, Institute of Electrical and Electronics Engineers (IEEE), July 2015, pp. 3368–75. Crossref, https://doi.org/10.1109/tia.2015.2407055.
    35. Renewable power generation costs in 2022. IRENA (International Renewable Energy Agency), 2023.
    36. Wang, Hongwei. “Taut Mooring.” Encyclopedia of Ocean Engineering, Springer Nature Singapore, 2022, pp. 1933–37. Crossref, https://doi.org/10.1007/978-981-10-6946-8_146.
    37. “Floating Wind Joint Industry Project: Phase III summary report.” Carbon Trust.
    38. “---.” News | NREL, www.nrel.gov/news/program/2020/reference-turbine-gives-offshore-wind-updraft.html.
    39. “DNVGL-ST-0119.” DNV, DNV.
    40. DNVGL-RP-0286. DNV.
    41. “D2.1 Review of the state of the art of mooring and anchoring designs, technical challenges and identification of relevant DLCs.” https://corewind.eu/wp-content/uploads/files/publications/COREWIND-D2.1-Review-of-the-state-of-the-art-of-mooring-and-anchoring-designs.pdf.
    42. “THE APPLICATION OF FIBER ROPE FOR OFFSHORE MOORING.” https://ww2.eagle.org/content/dam/eagle/rules-and-guides/current/offshore/90_fiberrope_2021/fiber-rope-gn-june21.pdf, ABS.
    43. Allen, Christopher, et al. Definition of the UMaine VolturnUS-S Reference Platform Developed for the IEA Wind 15-Megawatt Offshore Reference Wind Turbine. 1 July 2020, https://doi.org/10.2172/1660012.
    44. “離岸風場極限波高研析-以新竹外海為例.” https://www.tcri.org.tw/cnrfiles/download/429/4.%E9%9B%A2%E5%B2%B8%E9%A2%A8%E5%A0%B4%E6%A5%B5%E9%99%90%E6%B3%A2%E9%AB%98%E7%A0%94%E6%9E%90-%E4%BB%A5%E6%96%B0%E7%AB%B9%E5%A4%96%E6%B5%B7%E7%82%BA%E4%BE%8B.pdf, 營建知訊, 2018.
    45. 離岸風場作業安全評估技術開發計畫. 財團法人船舶暨海洋產業研發中心, 2014.
    46. 環境部「環評書件查詢系統」：書件摘要. eiadoc.moenv.gov.tw/eiaweb/10.aspx?hcode=1120231A&srctype=0.
    47. 九降風離岸風力發電計畫環境影響說明書. 2023, eiadoc.moenv.gov.tw/eiaweb/10.aspx?hcode=1120231A&srctype=0. Accessed 5 Aug. 2024.
    48. “OrcaFlex documentation including OrcaFlex API and Python interface.” Orcina, 2 Aug. 2024, www.orcina.com/resources/documentation.
    49. DNV-RP-0286 Coupled analysis of floating wind turbines. www.dnv.com/energy/standards-guidelines/dnv-rp-0286-coupled-analysis-of-floating-wind-turbines.
    50. DNV-OS-E301 - Position mooring.
    51. DNV-ST-0119 Floating wind turbine structures.
    52. Aqwa Theory Manual.
    53. ---. “Evolution of floating offshore wind platforms: A review of at-sea devices.” Renewable and Sustainable Energy Reviews, vol. 183, Sept. 2023, p. 113416. https://doi.org/10.1016/j.rser.2023.113416.

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