INFLUENEC OF MEASUREMENT METHODS ON PHOTOVOLTAIC PARAMETERS OF SOLAR CELLS
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摘要: 通过对二线与四线接法测试单晶硅太阳电池I-V曲线的实验结果对比,分析串联内阻对于太阳电池短路电流、开路电压、填充因子及最大输出功率测量结果的影响。结果发现串联内阻越大,太阳电池的短路电流、填充因子及最大输出功率测量结果越小,但对开路电压基本无影响。且太阳电池接收光强越大即输出电流越大时,串联内阻的影响也越大。二线法因串联内阻较大,相较四线测量方法,在光强分别为1160.69、734.61、470.15和232.14 W/m2时,最大功率降幅分别为64.73%、40.26%、22.98%、11.88%;填充因子降幅分别为64.10%、40.96%、22.22%、12.66%。表明内阻大小影响二线及四线测量结果,四线法测量方式能有效规避串联引线电阻和部分接触电阻,是较理想的测量方式。Abstract: Photovoltaic parameters are significant standards for measuring the quality of solar cells. While the measurement result of photovoltaic parameters is influenced by the methods of measurement. The effect of series resistance on the photovoltaic short-circuit current,open-circuit voltage,fill factor and maximum power has been analyzed by measuring the I-V characteristics with 2-wires and4-wires in this study. The experiment was carried out employing solar cell simulator at constant light intensities 232.14-1160.69 W/m~2 and using the vacuum thermostat to avoid the thermal convection. The results show that the measurement of short-circuit current fill factor and maximum power would decrease with increasing of series resistance. While the open-circuit is not influenced by the series resistance. In addition the effect of series resistance will be more powerful when the light intensity increasing. The measurement of 2-wires has higher seriesresistancethan 4-wires. At light intensity of 1160.69,735.61,470.15 and 232.14 W/m~2 the maximum power of 2-wires measurement would decrease by 64.73%,40.26%,22.98% and 11.88% than 4-wires measurement. Meanwhile,the fill factor of 2-wires measurement would decrease by 64.10%,40.96%,22.22% and 12.66% than 4-wires measurement. So the measurement of photovoltaic parameters is affectedbyseriesresistance. And the 4-wires measurement is more excellent than 2-wires because of lower series resistance.
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