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为研究地震载荷与风载荷联合作用下的大型风力机结构动力学响应,本文研究分别以Wind PACT 1.5 MW和NREL 5 MW风力机为研究对象,采用EI Centro 6.9级地震为输入激励,通过改进版的开源软件FAST(风电载荷仿真软件)计算风力机在正常运行、紧急停机和一直停机3种运行方式下的塔顶振动和塔架结构荷载情况,结果表明:地震载荷极大加剧了塔顶振动,机舱加速度峰值增大2倍以上。紧急停机操作可减小塔尖位移,一定程度上可以保护风力机结构安全。地震载荷主要增大了塔架一阶固有频率及其二倍频的振动。6.9级地震与额定风载荷联合作用下,NREL 5MW风力机塔基弯矩设计需求为159 MN·m,略大于极限风载荷作用。说明地震常发地区,塔架结构强度设计必须考虑地震载荷作用。
In order to study the dynamic response of large-scale wind turbine under earthquake and wind loads, this paper studied the Wind PACT 1.5 MW and NREL 5 MW wind turbines separately. The EI Centro MS 6.9 earthquake was used as input excitation. The open-source software FAST (wind load simulation software) calculates the tower vibration and the tower structure load under three kinds of operation modes of normal operation, emergency stop and always stop. The results show that the seismic load aggravates the vibration of the tower , Cabin acceleration peak increased more than 2 times. Emergency stop operation can reduce the spire displacement, to a certain extent, can protect the wind turbine structure safety. Earthquake load mainly increases the first natural frequency of the tower and its second harmonic vibration. Under the combined effect of 6.9-magnitude earthquake and rated wind load, the design moment of tower foundation bending moment of NREL 5MW wind turbine is 159 MN · m, slightly larger than the limit wind load. Earthquake-prone areas, indicating the strength of the tower structure design must consider the role of seismic load.