硅太阳电池工程用数学模型

为实现光伏电站、光伏户用系统、光伏水泵系统、"风 -光-柴-蓄"等各种涉及太阳能光伏利用复合能源系统的设计、数字仿真和动态模拟实验 ,以电子学理论为基础,讨论了满足工程应用精度且便于运算的太阳电池数学模型.该模型的特点是仅采用生产厂家为用户提供的太阳电池组件在标准测试条件(STC)下测出的I sc、Voc、Im、Vm作为参数,通过引入相应系数来考虑环境影响,并给出系数的典型值.实验结果表明模型的误差一般都在6%以下,可以满足对绝大多数工程项目进行物理模拟的精度要求.

INVESTIGATION ON ENGINEERING ANALYTICAL MODEL OF SILICON SOLAR CELLS

This paper presents the engineering analytical models of silicon solar cells derived from electronics theory.The main advantage of the model is four parameters:the short-circuit current(I sc );the open-circuit voltage(V oc );the maximum power point current (I m);the maximum power point voltage(V m)of a PV module under standard test conditions(STC) provided by manufacturers are only used.With some additional coefficients which typical values are given,it is possible to describe any I-V curve,taking into account cell temperature and solar radiation.This method has been tested on various solar modules,the difference between the real curves and the proposed fit was found to be less than 6 percent.Therefore,the accuracy of the model is sufficient for most practical engineering cases.Such as PV plants,solar home systems,PV-powered water pump and PV-included hybrid power supply systems,require simple models of solar cell which nevertheless have sufficient accuracy.