遮荫下光伏发电数学模型的对比研究

肖文波; 余晓鹏; 张华明; 吴华明

肖文波,余晓鹏,张华明,吴华明.遮荫下光伏发电数学模型的对比研究[J].电测与仪表,2019,56(10):56-61.
XIAO Wen-bo,YU Xiao-Peng,Zhang Hua-ming,Wu Hua-ming.Comparative Study of Photovoltaic Power Generation Math Model under Partial Shading Conditions[J].Electrical Measurement & Instrumentation,2019,56(10):56-61.

遮荫下光伏发电数学模型的对比研究

Comparative Study of Photovoltaic Power Generation Math Model under Partial Shading Conditions

DOI：10.19753/j.issn1001-1390.2019.010.009

中文关键词: 光伏电池发电模型阴影遮挡对比研究非线性效应

英文关键词:photovoltaic cells power generation model partial shading conditions comparative study nonlinear effect

基金项目:

作者中文名	作者英文名	单位
肖文波	XIAO Wen-bo	南昌航空大学江西省光电检测技术工程实验室
余晓鹏	YU Xiao-Peng	南昌航空大学江西省光电检测技术工程实验室
张华明	Zhang Hua-ming	南昌航空大学江西省光电检测技术工程实验室
吴华明	Wu Hua-ming	南昌航空大学江西省光电检测技术工程实验室

摘要点击次数: 1799

中文摘要:

本文对比研究了光伏系统的两种局部遮荫模型,即幂律模型与四参数模型.结果发现：首先,无论任何一种遮荫光伏模型都与实验数据总体符合较好,但都有明显误差;原因在于,两种模型都是在简化下获得.其次,可以看出在低的偏压下,两种模型都与实验数据符合较好,而在高偏压下,出现明显的误差;原因在于低偏压的时候,电池内部二极管未达到它的导通电压,流过二极管上的电流极小,可以忽略;电池可以看成是一个恒流源加上负载.随着电压的增大,太阳电池非线性效应显著增强,从而导致发电模型不适用.再次,注意到非均匀光照下,电池的工作状态受旁路二极管的影响不能由简单分析得到;旁路二极管是否处于阻断状态是一个渐变的过程,而不是简单的突变过程.最后,从均方根误差分析,可知四参数模型优于幂律模型;原因可能在于四参数模型考虑了光电流、反向饱和电流、理想因子、串联电阻的影响.

英文摘要:

In this paper, a model of photovoltaic system under shading conditions (called as power law model) is proposed and studied. And, another model (called as four-parameter model) is used as a comparative study. Firstly, the results show that, the two models are roughlySequivalentsStoSthe experimental phenomena, although there are obvious errors between theoretical calculation and experimental data. The reason is that both models are obtained with simplicity. Secondly, it can be seen that both models are in good agreement with the experimental data when the cell is at low bias voltages, while the significant errors occur as the cell at high bias voltages. The reason is that, the cell can be regarded as a constant current source and load as the cell at the low bias, with the increase of voltage, the nonlinear effect of all kinds of solar cells is enhanced significantly which results in that the power generation model is not applicable. Thirdly, noting that the operating status of the each cell in the module can not be obtained by a simple analysis when the module is at non-uniform light intensity. In fact, whether the bypass diode is in a blocked state is a gradual process rather than a simple abrupt process. Finally, from root mean square error analysis, it shows that the four-parameter model is better than the power-law model. The reason may be that the four-parameter model takes into account the effect of photocurrent, reverse saturation current, ideality factor, series resistance.

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