小面积阴影对太阳电池输出功率的影响

Influence on power output of solar cells with small area of shadow

由于鸟的排泄物、灰尘、落叶等因素的影响,小面积阴影在光伏系统中普遍存在。为了研究自然条件下,这类阴影对太阳电池实际输出功率的影响,利用单晶硅和多晶硅太阳电池进行了阴影影响测试。实测数据及分析结果表明:当这类阴影面积小于5 cm2时,基本不会对太阳电池的输出功率造成明显影响;而当阴影面积大于10 cm2时,太阳电池的输出功率将会出现较大幅度的降低,而且下降的幅度基本与阴影面积成线性关系,因此在光伏系统中应避免此类阴影;另外,相同面积的阴影在太阳电池单体表面的分布位置对输出功率基本没有影响。

Due to the impact of bird droppings, dust, leaves and other factors, small area of shadow was generally existed in PV systems. In order to study the influence of this kind shadow to the output power of solar cells under the natural conditions, silicon and poly-silicon cells were tested. According to the measured data and analysis results show that： when the shadow area on the surface of solar cells is less than 5 cm2, it will nearly cause no loss of output power; and when the shadow area is larger than 10 cm2, the output power will be significantly reduced, and the drop of output power is almost linear with the shadow area. Such shadow should be avoided in PV systems. In addition, the output power would not be affected by the location of the shadow on the surface of solar monomer.