脉动风空间相关性对光伏支架风振响应的影响

Impact of spatial correlation of fluctuating wind on wind-inducedresponse of photovoltaic support

【目的】探讨大跨度跟踪式光伏支架的风致振动问题。【方法】基于脉动风自回归模型(auto regressive model,AR)的模拟方法,以吉林白城市某发电厂已有支架为研究对象,通过脉动风空间相关性的对比,分析空间相关性对支架系统的位移、扭转角变化的影响,进而通过光伏支架的风振时域分析,研究支架结构的风振响应和杆件应力分布情况。【结果】脉动风空间相关性对光伏支架的风振响应产生显著的影响,空间风场中不同步的风载致使光伏板位移极值降低24%,扭转角度增加2.5倍,支架整体结构的扭转振动不容忽视;空间相关性使支架部分杆件的应力明显增加,最大应力增加17.7%,增加位置在主梁中点处,并据此总结出位移风振系数1.840~1.870。【结论】本研究结果可为大跨度跟踪式光伏支架避风控制系统的设计和开发提供依据。

[Objective]The wind-induced vibration of long-span tracking photovoltaic support is at issue.[Method]Based on the simulation method of auto regressive(AR)model,the existing support of a power plant in Baicheng,Jilin Province was taken as the research object,and the impact of spatial correlation on changes of displacement and torsion angle of the support system was analyzed through the comparison of spatial correlation of fluctuating wind,probing into the wind-induced response of the support structure and the stress distribution of members by means of the time domain analysis of wind-induced vibration of photovoltaic support.[Result]The spatial correlation of fluctuating wind has a significant impact on the wind-induced response of photovoltaic support.The unsynchronized wind load in the spatial wind field reduces the extreme displacement of the photovoltaic panel by 24%,and increases the torsion angle by 3.5 times.The torsional vibration of the whole support structure can not be ignored.The spatial correlation dramatically increases the stress of some members,with the maximum stress increase point located in the middle of the main beam,increasing by 17.7%,and it is concluded from this that the wind vibration coefficient of displacement ranges from 1.840 to 1.870.[Conclusion]The above conclusions can provide a basis for the development and design of wind protection control system for long-span tracking photovoltaic support.