三结太阳电池在非均匀光照下光斑强度和覆盖比率的优化研究

发布时间：2018-01-24 21:07

本文关键词： 聚光光伏三结太阳电池非均匀光照　出处：《物理学报》2014年16期 　论文类型：期刊论文

【摘要】：高倍聚光光伏组件通常采用光电转化效率较高的三结太阳电池.由于聚光器件的非理想性,电池承受的光照分布通常是高度非均匀的,在光伏组件中可通过适当增大光斑与电池面积的比率来降低光照非均匀性对电池电学性能的影响.通过对某一特定三结电池进行电路网络建模计算,分析光斑的强度分布和照射面积对电池的影响,并对比了四种设计方案(均匀光照、非均匀光照、电池效率最大、组件效率最大)下的光斑强度、光斑大小、电池效率以及电池温度分布.对比分析结果表明,组件达到效率最大时的电池效率并不是电池在标准测试条件下的最大效率,而使电池工作在效率最大值的设计方案中组件效率最低.组件效率最大方案中使用的聚光器透镜面积较小,因此该方案将导致组件成本增大.电池效率最大方案中使用的聚光器透镜面积较大并且电池温度最低,故该方案组件成本较低且可靠性较高.这表明在实际组件设计中应充分考虑对发电量的实际需求,选择合适的几何聚光倍数和光斑覆盖电池的比率.
[Abstract]:High-power condensed photovoltaic modules usually use three-junction solar cells with high photoelectric conversion efficiency. Due to the non-ideal of the condensing devices, the light distribution of the cells is usually highly non-uniform. In the photovoltaic module, the effect of light inhomogeneity on the electrical performance of the cell can be reduced by appropriately increasing the ratio of spot to cell area. The circuit network modeling calculation of a particular three-junction cell is carried out. The influence of intensity distribution and irradiation area of light spot on the battery was analyzed, and the spot intensity and spot size were compared under four design schemes (uniform illumination, non-uniform illumination, maximum cell efficiency and maximum component efficiency). The results of comparative analysis show that the maximum efficiency of the battery is not the maximum efficiency of the battery under the standard test conditions. In the design of the maximum efficiency of the battery, the component efficiency is the lowest. The lens area of the concentrator used in the maximum efficiency scheme is smaller. Therefore, this scheme will result in higher component cost. The concentrator lens area used in the maximum battery efficiency scheme is larger and the battery temperature is the lowest. Therefore, the cost and reliability of this scheme are lower and higher, which indicates that the actual demand for power generation should be fully considered in the design of practical components, and the appropriate geometric concentration multiple and the ratio of spot covering battery should be selected.
【作者单位】：中山大学工学院太阳能系统研究所;
【分类号】：TM914.4
【正文快照】： 1引言目前多结太阳电池的转换效率已超过43%[1].对于地面光伏应用领域,为了降低成本,多结太阳电池被广泛用于聚光光伏组件中.聚光光伏组件采用聚光装置将大面积的光照聚焦在面积较小的太阳电池上,从而有效降低组件成本.聚光装置有很多种不同的形式,采用菲涅耳透镜并结合二级光

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