风力发电机台风荷载响应分析

Wind Turbine Tower Structural Responses Under Typhoon Loads

首先考察了台风风场特征参数,包括物理参数、极值风速、风剖面、湍流强度、湍流积分尺度和脉动风速功率谱,在基于台风特征参数的基础上,结合环太平洋地区主要国家现行风荷载规范进行台风荷载频域计算,建立风力发电机有限元模型并进行台风荷载响应分析。结果表明,美国规范计算的结构响应值最大,中国规范次之,澳大利亚规范最小,且三者均大约为《建筑结构荷载规范》(GB 50009—2012)计算值的1.8倍;对于风电塔这种塔顶处机舱和叶片质量占总体结构比重大的特殊结构,利用规范进行频域分析得到的风荷载进行抗台风设计和验算偏于不安全,建议采用基于台风特征参数的时域分析来构造台风荷载。

This paper first analyzed characteristics of the typhoon wind field, including physical parameters, extreme wind speed, wind profile, turbulence intensity, turbulence integral scale, and power spectral density of fluctuating wind speed. A finite element model of an 1.5 MW wind turbine tower was developed and wind loads were constructed based on Chinese, American and Australian codes, respectively with parameters that represent typhoon characteristics. Structural responses of this wind turbine tower under different loading scenarios were compared. The results show that the tower responds most significantly under the wind loads being established by following the American code. The responses of the tower considering the typhoon characteristics are about 1. 8 times of the responses being estimated by directly using Chinese Load Code for the Design of Building Structures （ GB 50009 - 2010）.