• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (5): 82-88.doi: 10.3901/JME.2019.05.082

• 机械动力学 • 上一篇    下一篇

紧急停机工况下风力发电机系统动态特性分析

陈旭, 朱才朝, 宋朝省, 谭建军, 朱永超   

  1. 重庆大学机械传动国家重点实验室 重庆 400044
  • 收稿日期:2018-01-18 修回日期:2018-07-17 出版日期:2019-03-05 发布日期:2019-03-05
  • 通讯作者: 朱才朝(通信作者),男,1967年出生,教授,博士研究生导师。主要研究方向为传动系统动力学及振动噪声预估与控制。E-mail:cczhu@cqu.edu.cn
  • 作者简介:陈旭,男,1993年出生。主要研究方向为风机系统动力学。E-mail:hubbyxu413@outlook.com
  • 基金资助:
    国家自然科学基金(51575061)和重庆市重点产业共性关键技术创新专项(cstc2015zdcy-ztzx70010,cstc2015zdcy-ztzx70012)资助项目。

Dynamic Characteristics Analysis of Wind Turbine under Emergency Shutdown Events

CHEN Xu, ZHU Caichao, SONG Chaosheng, TAN Jianjun, ZHU Yongchao   

  1. The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044
  • Received:2018-01-18 Revised:2018-07-17 Online:2019-03-05 Published:2019-03-05

摘要: 以NREL 5-MW风力发电机为研究对象,综合考虑叶片和塔筒柔性、随机风载和控制策略,利用Simulink和FAST建立包含结构动力学和空气动力学的风力发电机系统耦合动力学模型。研究叶片卡死故障紧急停机工况下风机动态特性,分析停机时叶片参数对动态特性影响规律。结果表明:叶片卡死故障紧急停机工况下,塔筒底部受到较大反向冲击载荷,塔筒底部绕Y轴最大弯矩随故障叶片在停机初始时刻的方位角呈现周期性变化,变桨速度越大,风轮和塔筒底部受到的载荷也越大,停机时间越短;与正常停机工况相比,叶片卡死故障紧急停机时机舱X方向振动变大,其振动频率除了0.326 Hz塔筒前后(X-X)弯曲频率外,还出现0.668 Hz叶片一阶摆振频率,主轴俯仰力矩增大,塔筒底部绕Y轴最大弯矩及风轮最大推力减小。

关键词: 变桨故障, 动态特性, 风力发电机, 紧急停机

Abstract: The research is focused on the dynamic characteristics of wind turbine under emergency shutdown events caused by blade fault. Also the influence of blade parameters on wind turbine dynamic characteristics is discussed. The NREL 5-MW onshore wind turbine is studied. Simulink and FAST are used to develop the Aero-Servo-Elastic coupling dynamic model of wind turbine considering the flexibility of tower and blade, stochastic wind load as well as control strategy. The results show that, the tower-bottom suffer large impact load during emergency shutdown process, and the maximum bending moment of tower-bottom varies cyclically with the fault blade azimuth; When the wind turbine shutdown at different pitch rate, the duration of braking shortens gradually, and the loads on wind wheel and tower increase as the pitch rate increases. Compared with normal shutdown process, the nacelle vibration is intensified, and the main frequency components of nacelle's vibration acceleration are in accord with the first tower fore-aft natural bending frequency(0.326 Hz) and the first blade edgewise frequency(0.668 Hz); though the maximum bending moment of tower-bottom and the maximum of thrust are decreasing, the pitching moment of main shaft increases during emergency shutdown process.

Key words: dynamic characteristic, emergency shutdown, pitch system fault, wind turbine

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