5MW风力发电机动态特性仿真

发布时间：2018-05-21 14:23

本文选题：风力发电机 + 动态特性　；参考：《燕山大学》2015年硕士论文

【摘要】：能源与环境是当代社会发展所面临的两大问题,而风力发电具有无污染、可再生的优点,具有相当大的发展潜力。目前风力发电机正朝着商业化、大型化的方向发展,随着大型风机的开发,风力机系统动态特性研究的重要性日益凸显,尤其是叶片和塔筒等柔性大的关键部件,在复杂多变的环境工况下,它们的动态响应和载荷承受能力往往决定着风机整个系统能否正常运行,因此,对大型风机的动态特性分析具有重要的实际意义。本文通过对风力发电机动态特性的研究,主要做了以下工作:首先,以NREL 5MW风力发电机为研究对象,利用FAST平台对风力发电机进行建模,完成了风力发电机模态分析,依此研究风机在静态和正常工作下系统振动响应,防止发生共振现象。其次,为了对风机系统的动态特性深入研究,本文对风机的控制策略进行了仿真研究,通过理论推导,对原有的控制策略进行了改进,加入了塔筒前后加速度反馈,有效地提高了塔筒的运动阻尼;在此基础之上为保证风机各部件达到强度要求,本文对包含地震、极端风速和极端风向变化等特定工况下的载荷变化情况进行了仿真,确定了叶片和塔筒长度的极限载荷。从极限载荷出发,在满足强度要求的情况下,对叶片和塔筒关键部位进行了疲劳分析,从设计角度计算出了在设计寿命内不同材料系数和极限载荷因子下的等效疲劳载荷和疲劳损伤。最后,本文对海上风力机浮式平台的动态特性进行了分析,研究了其在0~1Hz白噪波浪的激励下,风力机刚柔特性、空气动力和入射角这三种因素对海上平台6个自由度运动的影响。本文还计算了三种海上概念风机对应不同风速和不同海况时风机系统的载荷,分析了不同平台对风机系统载荷的影响。
[Abstract]:Energy and environment are two major problems facing the development of modern society, and wind power generation has the advantages of non-pollution, renewable, and has considerable potential for development. At present, wind turbine is developing in the direction of commercialization and large-scale. With the development of large fan, the importance of research on dynamic characteristics of wind turbine system is becoming increasingly prominent, especially the key flexible components such as blade and tower, etc. Under complex and changeable environmental conditions, their dynamic response and load bearing capacity often determine the normal operation of the whole fan system. Therefore, it is of great practical significance to analyze the dynamic characteristics of large fan. The main work of this paper is as follows: firstly, taking NREL 5MW wind turbine as research object, using FAST platform to model wind turbine generator, the modal analysis of wind turbine generator is completed. The vibration response of fan system under static and normal operation is studied to prevent resonance. Secondly, in order to deeply study the dynamic characteristics of the fan system, the control strategy of the fan is simulated in this paper. Through theoretical derivation, the original control strategy is improved, and the acceleration feedback before and after the tower is added. The motion damping of tower and cylinder is improved effectively, and on this basis, in order to ensure that the components of the fan meet the strength requirements, the load variation under certain working conditions, including earthquake, extreme wind speed and extreme wind direction, is simulated in this paper. The limit load of blade and tube length is determined. Based on the limit load, the fatigue analysis of the key parts of the blade and the tower tube is carried out under the condition of satisfying the strength requirement. From the design point of view, the equivalent fatigue load and fatigue damage under different material coefficients and limit load factors in the design life are calculated. Finally, the dynamic characteristics of the floating platform of offshore wind turbine are analyzed, and the rigid and flexible characteristics of the platform are studied under the excitation of 0~1Hz white noise wave. The influence of three factors, aerodynamic force and incident angle, on the motion of six degrees of freedom of the offshore platform. This paper also calculates the load of three kinds of offshore concept fans corresponding to different wind speed and different sea conditions, and analyzes the influence of different platforms on the load of fan system.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM315

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