基于流固耦合模拟的光伏支撑系统风振特性研究

WIND VIBRATION CHARACTERISTICS ANALYSIS OF PV PANELS BRACKET SYSTEM BASED ON FSI SIMULATIONS

针对光伏阵列所处的复杂风环境,考虑流体压力荷载对支撑系统变形的跟随效应,推导流固耦合界面传递方程,采用流固耦合算法分析脉动风作用下光伏支撑系统的风振时程。研究表明:1)基于流固耦合算法的计算结果可准确反映支撑系统的风振特性;2)对于多排阵列,脉动风作用下的首排阵列支撑系统的位移响应在频域上的分布较为均匀,满足位移限定的条件下不会出现涡激共振;3)后排阵列支撑系统响应主频范围比较集中,位移限定条件容易满足,支撑设计首要考虑基频避开涡脱落主频范围,以防止出现涡激共振;4)光伏阵列各排动力放大效应差异较大;5)沿顺风向各排支撑系统响应折减效果显著,支撑选型时需要考虑该折减效应以进行经济指标控制。

Considering the complex wind environment on solar panels arrays and the linkage effect of fluid pressure load with the deformation of photovoltaic panel bracket, interface transmission equation of FSI wasdeduced. Wind vibration time-history of solar panels bracket system was studied based on FSI algorithm. The analysis results showed that the wind vibration characteristic can be accurately reflected based on the results of FSI algorithm; for multiple arrays the displacement response of first row array bracket under the fluctuating wind has an uniform distribution in frequency domain, which is unable to cause vortex exited resonance if the displacement limit condition is satisfied; the displacement response of back row array has a centralized distribution by comparisonand limit of displacement can be satisfied easily, therefore it should be primarily considered to make a separation between fundamental frequency of the bracket and principal frequency of vortex shedding in order to avoid vortex exited resonance; wide variation of the dynamic amplification effect exists among each row; reduction of the bracket response on each row along wind direction is very obvious, which means considering the reduction effect is very necessary when controlling economic index by selecting bracket section dimension.