一天中户外光伏组件输出性能影响规律的研究

Research on the influence of outdoor photovoltaic module output performance in one day

研究一天中光伏组件温度T、I-V等变化,分析得出一天中组件输出性能规律。首先发现一天中组件温度变化是一个耦合因素影响结果,而不仅仅由光强决定。组件输出功率主要是电流,而不是电压决定。其次发现一天中组件串并联电阻基本是先下降,然后上升。原因是中午温度高、光强大,组件漏电流增加导致的。相对于串联电阻,一天中组件并联电阻受环境影响更大。最后,发现相对于低温,高温下组件串并联电阻都比较稳定,原因是低温下影响组件性能的湿度等非线性耦合因素变化更复杂。以上结果得到理论与实验串联电阻的对比证明。

This paper investigated the variations in module temperature T and I-V,and analyzed the output law of photovoltaic modules in a day.Firstly,the temperature of the module during the day was found to be a result of coupling factors,not just related to the light intensity.The module output power was primarily determined by current,but not by voltage.Secondly,the series-parallel resistance of the modules basically decreased and then increased during the day.This was attributed to the increase in leakage current caused by high temperature and intense solar irradiance at noon.Compared with the series resistance,the parallel resistance was more affected by the environment during the day.Finally,the series and parallel resistances were relatively stable at high temperature conditions.The reason was that the nonlinear coupling factors that affect modules performance were more complex at low temperature condition.The above results were proved by comparing the theoretical and experimental series resistance.