工作状态对风力发电机地震响应的影响

EFFECTS OF OPERATING CONDITIONS ON THE SEISMIC RESPONSE OF WIND TURBINES

风力发电机受到的气动力作用表现为气动阻尼和空气动力荷载,对结构地震响应分别具有阻尼效应和动力效应。该文建立理论分析模型,考虑运行和停机两种工况,分析工作状态影响风力发电机地震响应的规律和机理;针对NREL 5 MW基准风机,采用FAST软件分析不同风-地震组合作用下风力发电机结构动力响应,验证理论分析结果的正确性;同时,分析输入地震动方向对风力发电机地震响应的影响。结果表明:工作状态对风力发电机地震响应的影响与地震动幅值和风速有关;强震作用下,停机状态地震单独作用为最不利工况;弱震作用下,额定风速-设计地震动组合是最不利荷载组合;输入地震动方向影响风力发电机动力响应。

Aerodynamic loading of wind turbines can be divided into aerodynamic damping and dynamic loading which have damping effect and dynamic effect on the seismic response of structures, respectively. A theoretical model is set up for analyzing the regularities and mechanism of how operating conditions affect the seismic response of wind turbine considering the running and parked conditions. The dynamic response of wind turbines is analyzed using FAST software under different wind-earthquake combinations for NREL baseline 5 MW wind turbines to validate the findings obtained in the theoretical model. The effects of input earthquake direction on the seismic response of wind turbines are analyzed. The results show that the effect of operating condition on the dynamic response of wind turbines depends on the seismic amplitude and wind speed. The most unfavorable load combination is seismic excitation in parked condition under strong ground motions. When the seismic action is weaker, it is the rated wind speed-design seismic action combination. The incident angle of earthquake waves significantly affects the dynamic response of wind turbines.