• Title/Summary/Keyword: Foundation of wind turbine

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A study on load evaluation and analysis for foundation of the offshore wind turbine system (해상풍력 하부구조물 하중영향평가 및 해석기술연구)

  • Kwon, Daeyong;Park, Hyunchul;Chung, Chinwha;Kim, Yongchun;Lee, Seungmin;Shi, Wei
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.11a
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    • pp.184.2-184.2
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    • 2010
  • With growing of wind turbine industry, offshore wind turbine system is getting more attention in recent years. Foundation of the offshore wind turbine plays a key role in stability of whole system. In this work, 5MW NREL reference wind turbine with rated speed of 11.4m/s is used for load calculation. Wind loads and wave loads are evaluated using GH-Bladed (Garard Hassan) and FAST (NREL). Additionally, FE simulation is carried out to investigate the wave effect on the support structure. Meanwhile, this work is trying to systematize and optimize load cases simulation for foundation of wind turbine system.

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A Study on Load Evaluation and Analysis for Foundation of the Offshore Wind Turbine System (해상풍력 하부구조물 하중영향평가 및 해석기술연구)

  • Kwon, Dae-Yong;Park, Hyun-Chul;Chung, Chin-Wha;Kim, Yong-Chun;Lee, Seung-Min;Shi, Wei
    • New & Renewable Energy
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    • v.6 no.3
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    • pp.39-46
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    • 2010
  • With growing of wind turbine industry, offshore wind energy is getting more attention in recent years. Among all the components of offshore wind turbines, the foundation of the offshore wind turbine plays a key role in stability of whole system. In this work, the 5 MW NREL reference wind turbine with rated speed of 11.4 m/s is used for load calculation. Wind and wave loads are calculated using GH-Bladed (Garard Hassan) and FAST (NREL). Additionally, FE simulation is carried out to investigate the wave effect on the support structure. Meanwhile, this work is to simulate systemic and optimized load cases for the foundation analysis of wind turbine system.

The study for design of the foundation insert of large wind turbine (대형풍력터빈 기초 인서트 설계에 관한 연구)

  • Han, Dong-Young;Choi, Won-Ho;Lee, Seung-Kuh
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.391-394
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    • 2007
  • The foundation insert is a tubular steel section which is embedded into the concrete of the foundation. The tower base section of the wind turbine is mounted on it. It has a top flange (L type) protruding far enough above the concrete to allow bolts to be inserted from underneath. The load is transmitted to the concrete at the base of the section through a T shaped flange. It has many holes for the reinforcements and the cables. The reinforcements of the concrete foundation run through the insert via a series of holes to bind the inner section to the outer section. Holes are provided for the power and communications cabling. The design follows normal European wind turbine practice, based on GL 2003 and Eurocode regulations.

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Comparison of Design Strands for Safety Factor of Offshore Wind Turbine Foundation (해상 풍력발전기 기초의 안전율에 관한 설계기준 분석 연구)

  • Jang, Hwa Sup;Kim, Ho Sun;Lee, Kyoung Woo;Kim, Mann Eung
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.2B
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    • pp.149-152
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    • 2012
  • This study is carried out to analyze the design method and safety rate degree for IEC 61400-3, DNV-OS-J101, GL Wind, EUROCODE, AASHTO and domestic design standard used for offshore wind turbine foundation design. The findings will provide a design parameter for domestic offshore wind turbine foundation design. The design of the steel Support Structure of an offshore wind turbine can be based on either the Allowable Stress Design(ASD) approach or the Load and Resistance Factor Design(LRFD) approach. The design principles with the use of LRFD method are described with various limit states. A limit state is a condition beyond which a structure or part of a structure exceeds a specified design requirement. Design by the LRFD method is a design method by which the target component safety level is obtained by applying load and resistance factors to characteristic reference values of loads (load effects)and structural resistance. When the strength design of the steel Support Structure is based on the ASD approach, the design acceptance criteria are to be expressed in terms of appropriate basic allowable stresses in accordance with the requirements specified. After comparison an economics domestic offshore wind turbine foundation standard will be developed.

Floating offshore wind turbine system simulation

  • Shi, Wei;Park, Hyeon-Cheol;Jeong, Jin-Hwa;Kim, Chang-Wan;Kim, Yeong-Chan
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.466-472
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    • 2009
  • Offshore wind energy is gaining more and more attention during this decade. For the countries with coast sites, the water depth is significantly large. This causes attention to the floating wind turbine. Offshore wind turbines are designed and analyzed using comprehensive simulation codes that account for the coupled dynamics of the wind inflow, aerodynamics, elasticity and controls of the wind turbine, along with the incident waves, sea current, hydrodynamics, and foundation dynamics of the support structures. In this work, a three-bladed 5MW upwind wind turbine installed on a floating spar buoy in 320m of water is studied by using of fully coupled aero-hydro-servo-elastic simulation tool. Specifications of the structures are chosen from the OC3 (Offshore Code Comparison Collaboration) under "IEA Wind Annex XXIII-subtask2". The primary external conditions due to wind and waves are simulated. Certain design load case is investigated.

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Load and Structural Analysis of an Offshore Wind-Turbine Foundation with Weight Control Functionality (자중조절 기능이 있는 해상풍력 지지구조의 하중 및 구조해석)

  • Oh, Minwoo;Kim, Donghyun;Kim, Kiha;Kim, Seoktae
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.3
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    • pp.453-460
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    • 2016
  • Offshore wind turbines are divided into an upper wind turbine and a lower support structure. Offshore wind turbine system is required to secure high reliability for a variety of external environmental conditions compared to ground wind turbines because of additional periodic loads due to ocean wave and current effects. In this study, extreme load analyses have been conducted for the designed offshore wind turbine foundation with weight control functionality using computational fluid dynamics (CFD) then structural analyses have been also conducted to investigate the structural design requirement.

A Study on the Suitability of Suction Caisson Foundation for the 5Mw Offshore Wind Turbine (5MW급 해상풍력발전시스템용 Suction Caisson 하부구조물 적합성 연구)

  • Kim, Yong-Chun;Chung, Chin-Wha;Park, Hyun-Chul;Lee, Seunug-Min;Kwon, Dae-Yong;Shi, Wei
    • New & Renewable Energy
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    • v.6 no.3
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    • pp.47-54
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    • 2010
  • Foundation plays an important role in the offshore wind turbine system. Different from conventional foundations, the suction caisson is proven to be economical and reliable. In this work, three-dimensional finite element method is used to check the suitability of suction caisson foundation. NREL 5MW wind turbine is chosen as a baseline model in our simulation. The maximum overturning moment and vertical load at the mudline are calculated using FAST and Bladed. Meanwhile the soil-structure interaction response from our simulation is also compared with the experiment data from Oxford university. The design parameter such as caisson length, diameter of skirt and spacing of multipod are investigated. Accordingly based on these parameters suggestions are given to use suction caisson foundations more efficiently.

Benchmark test of large scale offshore wind turbine with jacket foundation

  • Baek, Jaeha;Park, Hyunchul;Shi, Wei;Lee, Jusang;Lee, Jongsun
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.37.2-37.2
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    • 2011
  • Nowadays, offshore wind energy experiences a rapid development because of its wind condition and no noise impact problem. Different from Europe, offshore wind is just started in Asia. More work and research are needed in Korea. In this work, a three-bladed upwind variable speed pitch controlled 5MW wind turbine on a jacket support structure is used. During the simulation, several design load cases are investigated in two different fully coupled aero-hydro-servo-elastic codes. Some critical loads on the foundation are compared and analyzed.

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Technical Issues for Offshore Wind-Energy Farm and Monopile Foundation (해상풍력 발전의 기술동향 및 모노파일 기술개발 방향)

  • Choi, Chang-Ho;Cho, Sam-Deok;Kim, Ju-Hyong;Chae, Jong-Gil
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.486-493
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    • 2010
  • Recently, it has been a worldwide issue to develop offshore wind farm based on the past technical experiences of onshore wind turbine installation. In Korea, the government has the wind-energy to be a new-sustainable field of development to bring green-growth in near future and put political and fiscal efforts to support the academic and industrial technical development. Especially, there are much advancement for the fields of turbine, blade, bearing, grid connection, ETC. Correspondingly, technical needs do exist for the offshore foundation installation techniques in geotechnical point of view. Within few years, 2~5MW offshore wind turbines will be constructed at about 30m water depth and it is known that monopiles of D=4~6m are suitable types of foundation. In order to construct offshore wind-turbine foundation, technical developments for drilling machine, design manual, monitoring&maintenance technique are required. This paper presents technical issues with related to offshore wind farm and large diameter monopile in the point of renewable energy development.

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Nonlinear Structure-Soil Interaction Analysis for the Suction Bucket Foundation of Offshore Wind-Turbine (해상풍력 석션버켓 기초 구조-지반 상호작용 비선형 구조해석 및 실험결과 비교)

  • Jin, Jeongin;Kim, Donghyun;Jung, Minuk
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.3
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    • pp.469-475
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    • 2016
  • As we are facing the shortage of oil energy, studies on renewable energy, wind energy research has been naturally getting attention. Among wind energies, ocean wind energy is relatively abundant compared to land wind energy and therefore, is getting much attention in terms of its efficiency. However, the problem is the cost. Generally, the cost ratio of the supporting structure is over 25% of the total installation cost of a offshore wind turbine system. Thus, it is very important to reduce the total installation cost of the offshore wind turbine and develop accurate analysis methodology for various offshore wind turbine foundations. In this study, nonlinear structure-soil interaction analyses have been proposed and conducted for the typical suction bucket model of an offshore wind turbine foundation, and the results were compared with experimental test data for numerical validations.