双面光伏发电装置的双轴支架结构与控制策略
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摘要
单面光伏电池发电量偏低,为增加光伏系统发电量,利用其反面可发电特点,配置光反射器,实现双面光伏发电。反射器结构采用双轴跟踪支架,并基于此结构建立了双轴跟踪下双面电池的发电量计算模型。通过计算分析发现改进结构后的双轴跟踪双面光伏系统的日发电量比固定式单面光伏系统提高了90%以上。在主动前置跟踪策略下,对双轴支架转动次数、转动位置以及转动动作时间分布进行分层优化,根据日期和天气灵活地降低支架转动次数,有效简化了双轴支架的控制,此时系统发电量仍可达到精确跟踪下的90%以上。
The power generation of the present single PV system is low. In order to increase the PV system's power generation, the research on bifacial module with high-efficiency power generation was performed. One dual-axis solar tracker with reflector was designed, which could make full use of module's both sides. Based on the tracker's structure, one calculation model of bifacial PV system power generation was established. After calculation and analysis, it's found that the improved structure can increase PV system's power generation by more than 90%. By using active-front tracking strategy, the bracket rotation times, rotation position and action time could be optimized by the way of layered optimization. And the calculation shows that the optimal strategy can reduce bracket rotation times according to the date and weather, and simplify dual-axis solar tracker's control, at the same time the power generation can reach more than 90% of the precise tracking's power generation.
The power generation of the present single PV system is low. In order to increase the PV system's power generation, the research on bifacial module with high-efficiency power generation was performed. One dual-axis solar tracker with reflector was designed, which could make full use of module's both sides. Based on the tracker's structure, one calculation model of bifacial PV system power generation was established. After calculation and analysis, it's found that the improved structure can increase PV system's power generation by more than 90%. By using active-front tracking strategy, the bracket rotation times, rotation position and action time could be optimized by the way of layered optimization. And the calculation shows that the optimal strategy can reduce bracket rotation times according to the date and weather, and simplify dual-axis solar tracker's control, at the same time the power generation can reach more than 90% of the precise tracking's power generation.
引文
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[2]李欢东,许启明,石鑫.侧拉式斜单轴太阳能跟踪装置的设计及发电效率研究[J].机械科学与技术,2016,35(10):1609-1612.
[3]陈伟,林洁,马平,等.采用自适应趋光方法提高光伏发电效率的实验研究[J].工业仪表与自动化装置,2011(1):36-38.
[4]吴翠姑,吕学斌,张雷,等.n型硅双面发电光伏组件及其应用[J].半导体技术,2017,42(3):200-204.
[5]马少华,吕欣,崇锋,等.双玻双面光伏组件发电量测试分析[J].太阳能,2016(12):67-68.
[6]王宁,徐刚,舒杰,等.双面太阳电池垂直安装发电性能测试分析[J].太阳能学报,2008,29(8):976-979.
[7]LO C K,YUN S L,KEE S Y.Improvement of bifacial solar panel efficiency using passive concentrator and reflector system[C]//Proceedings of International Conference on Renewable Energy Research and Applications.Madrid,Spain:IEEE,2013:42-45.
[8]INGENITO A,LUXEMBOURG S L,SPINELLI P,et al.Optimized metal-free back reflectors for high-efficiency open rear c-Si solar cells[J].IEEE Journal of Photovoltaics,2016,6(1):34-40.
[9]YUSUFOGLU U A,LEE T H,PLETZER T M,et al.Simulation of energy production by bifacial modules with revision of ground reflection[J].Energy Procedia,2014,55:389-395.
[10]姜会飞,温德永,李楠,等.利用正弦分段法模拟气温日变化[J].气象与减灾研究,2010,33(3):61-65.