基于TLP原理的海上风机浮式基础研究

发布时间：2018-01-07 19:08

本文关键词：基于TLP原理的海上风机浮式基础研究　出处：《江苏科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：海上蕴含丰富的风能，海上风力发电为人类提供了大量可再生清洁能源。海上风电从浅海的桩柱型向深海的漂浮式发展是必然趋势。深海的漂浮式风力发电已成为国外研究的热点领域，但在我国尚处于起步阶段。对海上浮式风机而言，浮式基础结构显得尤为重要，因此，急需开展海上风机浮式基础的研究。本文参考IEC-61400-3规范（国际电工协会《海上风机设计要求》）及DNV海上浮式平台相关规范，对基于TLP原理的海上风机浮式基础进行了概念设计及相关力学性能的系统研究。主要研究内容及相关结论如下：（1）对基于TLP原理的海上风机浮式基础进行了概念设计。通过对不同平台型式的特点分析，选定了TLP平台基础型式；初步确定了浮式基础的主尺度。同时对概念设计的浮式基础进行了稳性和运动性能初步计算，通过计算发现海上张力腿浮式风机主要性能指标均满足要求，并对计算结果进行了初步分析。（2）对海上张力腿浮式风机整体结构进行了动力响应研究。建立了全耦合一体化海上张力腿浮式风机整体结构有限元模型并对其进行了动态特性分析，分析发现浮式风机系统的整体结构固有频率有效的避开风轮激励频率和主要海浪频率；选取风机正常发电状态下的工况对海上张力腿浮式风机在风浪流联合作用下的动态响应进行时域耦合仿真分析，并计算和分析了海上张力腿浮式风机在特定风浪组合下不同响应变量的变化特点；通过不同响应变量的谱密度函数特征比较了不同风速、不同波高对浮式风机响应变量的影响，分析发现在特定风速范围内，风载荷对浮式风机系统的影响要比波浪载荷大。（3）对基于TLP原理的海上风机浮式基础进行了水动力性能研究。在频域范围内计算了TLP型浮式基础的水动力系数，，得到了一阶波浪激励力和六自由度运动响应的RAO；通过对RAO进行分析，给出了可能使TLP型浮式基础处于危险海况的波浪频率范围；并研究了张力腿预张力、张力腿刚度、张力腿长度、张力筋腱根数等特征参数对浮式基础运动响应的影响；对TLP型浮式基础受到的一阶波浪激励力和六自由度运动响应分别进行了短期和长期预报。（4）对基于TLP原理的海上风机浮式基础进行了结构设计。参考DNV海洋平台规范，使用载荷抗力分项系数设计法选取不同极限状态下的载荷系数，确定了TLP型浮式基础不同部位的设计载荷；根据设计载荷确定了浮式基础不同部位的最小设计板厚以及加强筋和桁材的最小剖面模数。（5）对基于TLP原理的海上风机浮式基础进行了波浪载荷预报。建立了详细的TLP型浮式基础波浪载荷计算模型；计算了TLP型浮式基础典型剖面载荷并得到了各工况下典型剖面载荷分量的传递函数；完成了典型剖面载荷的长期预报，得到各工况下典型剖面载荷分量的长期统计值，并确定了TLP型浮式基础总体强度分析所需的设计波参数。（6）对基于TLP原理的海上风机浮式基础进行了总体强度分析。建立了TLP型浮式基础总体强度分析的有限元模型；完成了不同载荷工况下TLP型浮式基础总体强度计算；对TLP型浮式基础的总体强度计算结果进行分析并对高应力区进行讨论，给出了影响TLP型浮式基础总体强度的关键因素及修改意见。（7）设计了海上张力腿浮式风机缩尺比试验模型，进行了试验方案设计。试验方案中拟安排主要测量海上张力腿浮式风机在风浪联合作用下的运动响应性能，以及风载荷的模拟方法对于张力腿浮式风机运动响应的影响。
[Abstract]:The sea is rich in wind energy, offshore wind power provides a large number of renewable and clean energy for human beings. The floating offshore wind power development from shallow to deep water pile type is an inevitable trend. The floating wind power sea has become a hot research field abroad, but in China is still in its infancy. In terms of floating fan, floating foundation structure is particularly important, therefore, the research of offshore wind turbine floating foundation is urgently needed.
According to the IEC-61400-3 specification (International Electrotechnical Association "requirements for offshore wind turbine design >) and DNV floating platform specification, floating foundation of offshore wind turbines based on TLP principle makes a systematic research on the conceptual design and relevant mechanical properties. The main research contents and conclusions are as follows:
(1) on the conceptual design of floating foundation for offshore wind turbine based on TLP principle. Through the analysis of features of different types of platform, selected the TLP platform foundation; determined the main dimensions of the floating foundation. At the same time floating foundation for the conceptual design of stability and motion can be calculated, found by calculating the offshore tension leg floating wind turbine main performance indexes meet the requirements, and the results are analyzed.
(2) the overall structure of the floating offshore tension leg type fan is studied. A fully coupled dynamic response of integrated offshore tension leg floating wind machine finite element model of the whole structure and has carried on the analysis of dynamic characteristics analysis, found that the overall structure of the fan system inherent floating frequency effectively avoid the excitation frequency of wind wheel and the main wave frequency; selection of fan power under the normal condition analysis of time-domain dynamic coupling simulation of offshore tension leg floating fan in the wind and waves flow under the action of combined response, analyzed the change characteristics of offshore floating wind turbine tension leg in a specific combination of different waves of response variable is calculated and the different wind speed; by comparing the spectral characteristics of different density function of the response variable, different height of floating response variables affect the fan, analysis found in a specific wind speed range, the wind load on the floating wind turbine system The influence is larger than the wave load.
(3) on the floating foundation of offshore wind turbine based on TLP principle is studied. The hydrodynamic coefficients of hydrodynamic performance in frequency domain calculation of TLP type floating foundation, the first-order wave force response and six degree of freedom RAO; through the analysis of RAO wave frequency range is given can make TLP type floating foundation is in danger of the sea; and to study the tension leg tension, tension leg stiffness, tension leg length, the effects of tension tendon root number and other parameters on the response characteristics of floating foundation movement; short-term and long-term prediction of response and six degrees of freedom motion of one wave TLP floating foundation by the excitation force.
(4) to design the structure of floating foundation for offshore wind turbine based on TLP principle. DNV platform specification, using the partial coefficient of load resistance design method to select the load coefficient of different limit state, determine the design load of different parts of TLP type of floating foundation; according to the design load to determine the minimum design in different part of the floating foundation thick and the strengthening of minimum reinforcement and girder section modulus.
(5) on the floating foundation of offshore wind turbine based on TLP principle of wave load forecast model. The TLP type floating foundation wave load established in detail; calculation of TLP type floating foundation of typical section load and the transfer function is given under the condition of typical section load components; completed the long term prediction of typical section load, long-term statistics of typical section load components under different working conditions, and the design wave parameters analysis of TLP type floating foundation to determine the overall strength.
(6) on the floating foundation of offshore wind turbine based on TLP principle of the overall strength analysis. A finite element analysis of TLP type floating foundation for the overall strength of the model; complete the calculation of the overall strength of TLP type floating foundation under different loading conditions; the overall strength of TLP type floating foundation calculation results are analyzed and the high stress area is discussed. The key factors are the impact of type TLP floating foundation overall strength and revisions.
(7) the design of the floating offshore tension leg type fan scale model test, the test scheme was designed. The performance of response in the test program intends to arrange the main measuring offshore tension leg floating fan in the wind and waves of the movement, and the simulation method of wind load influence on the tension leg floating wind turbine movement response.

【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476.1;TM315

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