摘要
针对坡度陡峻、冲沟发育的复杂山地环境下的柔性光伏支架跨度优选缺乏系统性指导的难题,以云南省某山地光伏发电项目为背景,利用有限元分析软件MIDAS Gen建立了采用双层索系结构的柔性光伏支架的3D有限元模型;然后对该柔性光伏支架采用3种跨度时的静力性能(包括变形与应力)与动力特性(自振频率)进行了对比分析;通过引入“等效用钢量”这一综合评价指标,对3种跨度的柔性光伏支架的经济性进行了对比研究。研究结果表明:1)当柔性光伏支架跨度为40 m和60 m时,均能满足JGJ 257—2012对光伏支架结构变形和应力的要求;而当柔性光伏支架跨度为80 m时,则存在刚度不足和索应力超限的问题,需调整预应力或增大索截面。2)在以等效用钢量作为评价指标的情况下,当柔性光伏支架跨度为60 m时,其经济性最优,比跨度为40 m和80 m时的用钢成本分别减少约7.6%和14.6%。3)在类似复杂山地环境下的光伏发电项目中,从确保结构安全性且兼顾经济性的角度出发,设计柔性光伏支架时,建议在55~65 m范围内优先选取其跨度值。此跨度范围的下限由经济性快速提升的起始点决定,上限则由结构性能开始显著恶化的临界点决定。4)后续研究中可从增加跨度取样数量、考虑光伏组件与光伏支架之间的相互作用、索节点的滑移与摩擦细节,以及长期疲劳和极端气候下的时程分析等方面进行进一步的研究。研究结果可为应用于复杂山地环境下的柔性光伏支架的跨度选择提供决策依据,对推动柔性光伏支架在此类环境下的规模化应用具有指导价值。
To address the lack of systematic guidance for span optimization of flexible PV brackets in complex mountainous environments characterized by steep slopes and well-developed gullies,this paper establishes 3D finite element models of flexible PV brackets with dual-layer cable structure using the finite element analysis software MIDAS Gen,based on a mountain PV power project in Yunnan Province.Static performance(including deformation and stress)and dynamic characteristics(natural frequencies)of the flexible PV brackets with three different spans are comparatively analyzed.The comprehensive evaluation metric of"equivalent steel consumption"is introduced to compare the economic performance of the flexible PV brackets with three span options.The research results show that:1)When the span of the flexible PV brackets is 40 m or 60 m,both deformation and stress requirements of specifications of JGJ 257—2012 are met,whereas a 80 m span exhibits insufficient stiffness and cable stress exceeds the limit,necessitating prestress adjustments or larger cable crosssections.2)Using equivalent steel consumption as the evaluation index,the 60 m span of flexible PV brackets demonstrates optimal economic efficiency,reducing steel costs by approximately 7.6%and 14.6%compared to the 40 m and 80 m spans,respectively.3)In PV power projects under similar complex mountainous conditions,when designing flexible PV brackets from the perspective of ensuring structural safety while balancing economic efficiency,it is recommended to prioritize a span value within the range of 55~65 m.The lower limit of this span range is determined by the inflection point where economic benefits rapidly improve,while the upper limit is governed by the critical point where structural performance begins to degrade significantly.4)Future research could further explore increasing span sampling quantities,considering the interaction between PV modules and PV brackets,cable node slip and friction details,as well as the time history analysis under long-term fatigue and extreme climate effects.These findings provide decision-making support for span selection of flexible PV brackets in complex mountainous environments and offer valuable guidance for scaling up their application in such settings.
作者
胡正
王天云
王睿佳
王京增
曾祥兵
任帅
Hu Zheng;Wang Tianyun;Wang Ruijia;Wang Jingzeng;Zeng Xiangbing;Ren Shuai(SPIC Yuanda Environmental Protection Engineering Co.,Ltd.,Chongqing 400000,China)
出处
《太阳能》
2026年第2期72-80,共9页
Solar Energy
关键词
复杂山地环境
光伏发电项目
柔性光伏支架
静力特性
动力特性
跨度优化
等效用钢量
complex mountainous environments
PV power project
flexible PV brackets
static performance
dynamic characteristics
span optimization
equivalent steel consumption
