风和波浪耦合作用下漂浮式光伏电站结构动力研究

Research on the structural dynamics of floating photovoltaic (PV) system under the condition with wind and wave coupled

基于Davenport脉动风功率谱和JONSWAP波浪谱(Goda改进后)模型,通过两者基本物理变量中的共同参数u实现风与波浪的简单耦合,根据频率谱生成相应风压和波浪力时程,据此采用有限元软件SAP2000建立水上漂浮系统及光伏支架的三维整体模型,开展结构动力性能研究。结果表明:锚索动力分析的轴力数据大于静力分析的结果,工程设计时应考虑适当增大锚索截面和蛙锚重量;锚索改变了漂浮系统受力,漂浮系统受力主要向锚索部位集中;动力作用下结构体系沿风行进方向飘移的距离大于静力作用下的距离,组件布置时要充分考虑此漂移距离;实际工程中建议对锚索进行预张紧处理,保持结构体系在正常运行期间的稳定;结构体系的平面转动效应大于竖向振动,结构体系主要处于平面转动状态。

Based on the Davenport fluctuating wind power spectrum and JONSWAP wave spectrum(improved by Goda),the simplified coupling of wind and wave is inducted by the common parameter u,and the corresponding wind pressure and wave force in time domain is generated according to the frequency spectrum.Then the three-dimension whole model of floating PV system is built by using the finite element method software(SAP 2000)in structural design,and the dynamic performance is studied.The result shows that the axial force of anchor cable in dynamic is more than that in static.The anchoring cable changes the mechanical performances of floating PV system,which leads the force concentrated on anchoring zones.The structural system in dynamic drifts along the wind direction by a distance more than that in static,which should be fully considered when planting the PV.This paper suggests pre-pulling the anchor cable to maintain the stability of the floating PV system during the normal operation.And the plane rotation effect of the system outweighs the vertical vibration effect.