光伏组件柔性拖曳结构与传统刚性结构风振响应对比

COMPARISON OF WIND VIBRATION RESPONSE OF FLEXIBLE DRAGGING SUPPORT STRUCTURE AND TRADITIONAL RIGID SUPPORT STRUCTURE OF PHOTOVOLTAIC MODULES

为准确探究柔性支撑体系下光伏组件振动特性,以某光伏工程为研究对象,考虑稳定结构及承重结构对整体的影响,分别建立传统刚性支撑体系与柔性支撑下的“系泊-光伏组件阵列结构”有限元模型,基于Davenport风谱采用AR自回归技术模拟脉动风荷载进行风振响应分析,对比两种支撑方式的经济性、风振特性及稳定结构对柔性支撑体系的振动影响。结果表明:1)刚性支撑主要以横向摆动为主,平均振幅约为0.5cm,其风振系数分布均匀,建议取值2.0;2)柔性支撑体系以竖向振动为主,平均振幅约为12.3 cm,比刚性体系振幅大,风振系数建议取值1.7~1.8;3)柔性支撑体系建造成本比传统刚性支撑高出约40%,但占地面积减少约32%。说明柔性支撑在抗风性能、经济性方面都不及传统刚性支撑,但其优势主要在于对地形的高适应性,具有跨度大、净空高、有效提高地面利用率等优点,可在劣势地貌下作为刚性支撑的替代;4)地锚拖曳结构对光伏组件振动有明显约束作用,因此在设计时,地锚拖曳结构的数量、分布调整可作为柔性支撑下光伏阵列的结构优化首选条件,以提高整体稳定性。

In recent years,the development of flexible support systems for photovoltaic modules has enabled photovoltaic projects to be effectively applied in disadvantaged landforms such as woodlands,slopes and canyons.In order to accurately explore the vibration characteristics of photovoltaic modules under the flexible support system,taking a project photovoltaic array as the research object,considering the influence of stable structure and load-bearing structure,the finite element models of the photovoltaic panels with traditional rigid support system and the flexible“mooring-photovoltaic panel array structure”support system respectively were established.Based on the Davenport wind spectrum,using the AR autoregressive technique to simulate the fluctuating wind load,the wind vibration response analysis was carried out.The economic benefits,wind vibration characteristics of the two support methods and the vibration effects of the stable structure on the flexible support.The result shows were compared:1)The rigid support is mainly dominated by lateral swing,the average amplitude is about 0.5 cm,and its wind vibration coefficient is evenly distributed,the recommended value is 2.0.2)The flexible support system mainly vibrates in the downwind direction,with an average amplitude of about 12.3 cm,which is larger than that of rigid system,and the recommended value of wind vibration coefficient is 1.7-1.8.3)The construction cost of the flexible support system is about 40%higher than that of the traditional rigid support,but the covering area is reduced by about 32%.It shows that the flexible support is inferior to the traditional rigid support in terms of wind resistance and economy,but the advantage is mainly in the high adaptability to the terrain,and it can be used as a substitute for rigid support in inferior terrain.4)The ground anchor drag structure has obvious restraint effect on displacement of photovoltaic panels.Therefore,the ground anchor drag structure can be appropriately added to increase the wind resistance of flexible support photovoltaic array.