發(fā)布時(shí)間：2018-05-21 14:23

  本文選題：風(fēng)力發(fā)電機(jī) + 動(dòng)態(tài)特性�。� 參考：《燕山大學(xué)》2015年碩士論文

【摘要】：能源與環(huán)境是當(dāng)代社會(huì)發(fā)展所面臨的兩大問(wèn)題,而風(fēng)力發(fā)電具有無(wú)污染、可再生的優(yōu)點(diǎn),具有相當(dāng)大的發(fā)展?jié)摿ΑＤ壳帮L(fēng)力發(fā)電機(jī)正朝著商業(yè)化、大型化的方向發(fā)展,隨著大型風(fēng)機(jī)的開(kāi)發(fā),風(fēng)力機(jī)系統(tǒng)動(dòng)態(tài)特性研究的重要性日益凸顯,尤其是葉片和塔筒等柔性大的關(guān)鍵部件,在復(fù)雜多變的環(huán)境工況下,它們的動(dòng)態(tài)響應(yīng)和載荷承受能力往往決定著風(fēng)機(jī)整個(gè)系統(tǒng)能否正常運(yùn)行,因此,對(duì)大型風(fēng)機(jī)的動(dòng)態(tài)特性分析具有重要的實(shí)際意義。本文通過(guò)對(duì)風(fēng)力發(fā)電機(jī)動(dòng)態(tài)特性的研究,主要做了以下工作:首先,以NREL 5MW風(fēng)力發(fā)電機(jī)為研究對(duì)象,利用FAST平臺(tái)對(duì)風(fēng)力發(fā)電機(jī)進(jìn)行建模,完成了風(fēng)力發(fā)電機(jī)模態(tài)分析,依此研究風(fēng)機(jī)在靜態(tài)和正常工作下系統(tǒng)振動(dòng)響應(yīng),防止發(fā)生共振現(xiàn)象。其次,為了對(duì)風(fēng)機(jī)系統(tǒng)的動(dòng)態(tài)特性深入研究,本文對(duì)風(fēng)機(jī)的控制策略進(jìn)行了仿真研究,通過(guò)理論推導(dǎo),對(duì)原有的控制策略進(jìn)行了改進(jìn),加入了塔筒前后加速度反饋,有效地提高了塔筒的運(yùn)動(dòng)阻尼;在此基礎(chǔ)之上為保證風(fēng)機(jī)各部件達(dá)到強(qiáng)度要求,本文對(duì)包含地震、極端風(fēng)速和極端風(fēng)向變化等特定工況下的載荷變化情況進(jìn)行了仿真,確定了葉片和塔筒長(zhǎng)度的極限載荷。從極限載荷出發(fā),在滿足強(qiáng)度要求的情況下,對(duì)葉片和塔筒關(guān)鍵部位進(jìn)行了疲勞分析,從設(shè)計(jì)角度計(jì)算出了在設(shè)計(jì)壽命內(nèi)不同材料系數(shù)和極限載荷因子下的等效疲勞載荷和疲勞損傷。最后,本文對(duì)海上風(fēng)力機(jī)浮式平臺(tái)的動(dòng)態(tài)特性進(jìn)行了分析,研究了其在0~1Hz白噪波浪的激勵(lì)下,風(fēng)力機(jī)剛?cè)崽匦�、空氣�?dòng)力和入射角這三種因素對(duì)海上平臺(tái)6個(gè)自由度運(yùn)動(dòng)的影響。本文還計(jì)算了三種海上概念風(fēng)機(jī)對(duì)應(yīng)不同風(fēng)速和不同海況時(shí)風(fēng)機(jī)系統(tǒng)的載荷,分析了不同平臺(tái)對(duì)風(fēng)機(jī)系統(tǒng)載荷的影響。
[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.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TM315

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本文編號(hào)：1919543