光伏组件热斑效应研究

HOT SPOT EFFECT FOR PHOTOVOLTAIC MODULES

该文对目前主流的p型光伏组件产品特别是大尺寸太阳电池所制备光伏组件的热斑温度进行测试研究,具体分析影响热斑温度的关键影响因素,被遮挡太阳电池的热斑温度由单位面积上耗散的功率Φq决定,即与单串太阳电池片数量、太阳电池片漏电流、太阳电池片漏电流的分布相关,太阳电池片漏电点处的非均匀加热是热斑局部温度偏高的主要原因。同时对单串太阳电池片数相对较多的光伏组件热斑风险控制进行探讨,反偏电压下太阳电池漏电流值的控制能有效降低热斑温度,通过红外测试对一定反偏电压下太阳电池漏电点与非漏电区域太阳电池片温差分档,可进一步控制热斑风险。

This paper conducts a test study on the hot spot temperature of modules prepared by current mainstream module products,especially large-size cells,and specifically analyzes the key influencing factors affecting the hot spot temperature.The hot spot temperature of the shaded cells is determined by the power dissipated per unit areaΦq,i.e.,it is related to the number of cells in a single string,the cell leakage current,and the distribution of the cell leakage current.The non-uniform heating at the cell leakage point is the main reason for the high local temperature of the hot spot.At the same time,this paper discusses the hot spot risk control of modules with a relatively large number of single-string cells.The control of cell leakage current value at reverse bias voltage can effectively reduce the hot spot temperature.The screening of cells based on the temperature difference between cell leakage point and non-leakage area at reverse bias voltage can further control the hot spot risk.