太阳电池显式双二极管模型建立及其参数提取研究

为消除太阳电池双二极管模型中电流与电压的内隐耦合关系,结合线性近似和Lambert W函数推导太阳电池的显式双二极管模型。随后采用改进的教与学优化算法对模型的特征参数进行提取,并利用4种不同类型太阳电池的实测数据对模型的准确性进行验证。结果表明,计算电流值与实测数据有很好地一致性,与文献对比精度更高,说明太阳电池显式双二极管模型对太阳电池的I-V特性曲线具有更高的拟合精度和更好的适应度。     

非晶硅与晶硅太阳电池发电比较分析

采用实验测量装置对非晶硅太阳电池组件和单晶硅太阳电池组件的日均发电量进行测试对比,并对非晶硅的温度系数、I-V曲线特性及低光强下的吸收特性进行了分析。结果显示:非晶硅太阳电池板的发电效能优于单晶硅太阳电池板。     

异质结太阳电池测试标准的研究进展

针对异质结(HJT)太阳电池在I-V测试中遇到的主要问题,归纳总结了迟滞效应的成因和解决方法,以及双面HJT太阳电池的测试标准和评价体系,研究了不同测试参数对迟滞误差的影响,分析了测试台反射率及接触方式对HJT太阳电池I-V测试结果的影响,并通过简述HJT太阳电池亚稳态特性的研究进展,找出HJT太阳电池精确测试的方法,...     

太阳电池直流模型的计算机仿真

太阳电池特性由材料、设计和工艺决定，太阳电池直流模型则可描述其电特性。现有的测试方法不能直接测出模型参数，但容易获得太阳电池片实测Ｉ—Ｖ数据，采用最小二乘法拟合出模型参数，就可以建立模型参数与制造工艺的直观联系。本文对提高模型拟合的速度及精度的实现方法进行讨论，在计算机上实现快速拟合。     

太阳电池伏安特性的演变及其控制准则

从数学层面分析 I_(ph)、I_0、n、R_s、R_(sh)5参数模型太阳电池电流方程的切线方程和二阶导数。同时给出I-V特性曲线趋直时的直线方程形式,以及满足基尔霍夫定律的直线式太阳电池电流方程。从数学层面证明增大光生电流I_(ph)或串联内阻R_s时,准则数α(I),V的取值范围减小,并指出只有串联内阻存在时,才出现I-V特性曲线由曲趋直现象。通过实验,采用外加串联内阻的方式验证增大串联内阻I-V特性曲线由曲趋直现象。     

从Ⅰ-Ⅴ特性曲线分析太阳电池烧结工艺条件

通过对太阳电池的I-V特性曲线进行检测分析,得出太阳电池的串、并联电阻与电极烧结的各个温度段的温度密切相关,并联电阻受高温区温度和烧结时间(带速)的影响。通过对烧结工艺的优化调整,获得了较好性能的太阳电池,得到了烧结工艺调整优化的方法。     

太阳电池I-V特性的解析研究及其在参数测量和品质分析上的应用

本文采用数学分析和数值计算方法对太阳电池的特性参数和I-V曲线的关系进行了系统的研究,计算和测量的结果一致。找到了一个能把分散的测量统一起来的综合测试方案,能对太阳电池的整套特性参数进行快速测量,综合测试台的样机正在试制,本文阐明的是其基本思想。     

用解析模型拟合太阳电池I－V特性的实验数据

采用单指数和双指数形式太阳电池理论模型对太阳电池的Ｉ－Ｖ特性的实验数据进行拟合，其最大相对误差为０．６５％—０．２３％，均方根差为２．５ｍＡ—６．３ｍＡ。获得了重要待定参数的拟合值，拟合精度接近多项式模型的结果。     

硅太阳电池模型参数计算优化方法

在进行光伏发电系统的数字仿真、输出功率预测、运行调度和优化设计时,均需对太阳电池及阵列的电气特性进行精确建模。以硅太阳电池单二极管等效电路模型为基础,运用粒子群算法,提出一种计算模型五参数(Iph、Isat、Rs、Rsh、A)的优化方法,并分析了辐照强度和温度变化对模型参数的影响。该方法仅使用太阳电池生产厂商提供的在标准测试状况下的4个电气参数(Voc、Isc、Vm、Im),便可计算一般工况下的I-V特性曲线。在Matlab中建立仿真模型,仿真与实验结果表明新模型对于I-V曲线的预测误差一般在2%以内。     

基于DSP与dsPIC的数字式太阳电池阵列模拟器设计

数字式太阳电池阵列模拟器的实现基于太阳电池的数学物理模型.系统采用低功率TMS320LF2406与dsPIC30F2020作为核心的控制电路,可以动态模拟光伏阵列在各种环境条件下的I-V特性,并记录负载运行情况,提供分析数据和历史曲线记录.     

Parameters extraction from commercial solar cells I–V characteristics and shunt analysis

In this paper, an optimized method on the basis of polynomial fitting and Lambert W function is presented to extract parameters from the current–voltage (I–V) characteristics of commercial silicon solar cells. Since the experimental outcomes have significant impact on the precision of extracted parameters, polynomial fitting serves to overcome the obstacles of measurement noise in this method. The Lambert W function is employed to translate the transcendental equation into explicit analytical solution. Comparing with the as-reported parameters of a silicon cell and a plastic cell in the previous literature, the interesting outcomes demonstrate that the proposed approach is helpful for obtaining precise extracted data. This is further showed by the good agreements between the fitted I–V curve and the experimental results of a commercial monocrystalline silicon solar cell. Moreover, full extracted parameters of a badly shunted multicrystalline silicon solar cells before and after laser isolation process are conducted and investigated, the good fitting results finally show the validity of this attempt again.     

基于多传感器信息融合的太阳电池动态建模

为获取运动状态下太阳电池输出特性,提出一种基于多传感器信息融合的太阳电池动态建模方法。基于多传感器信息融合测量模型、欧式空间旋转理论、光照强度与太阳电池空间位置关系和太阳电池数学模型及其参数与光照强度之间耦合关系,构建太阳电池动态模型得到其动态输出特性。通过SIMPACK及Matlab/Simulink仿真软件建立太阳电池动态发电仿真平台验证了方法的有效性。结果表明,载体的运动明显影响了太阳电池输出特性,且在太阳电池输出最大功率点处的功率最大减少了18.038%。     

太阳电池的双指数简化模型

以太阳电池的双指数理论模型为研究对象,通过数值模拟的方法,建立太阳电池的简化模型,并利用太阳电池的实验数据进行了模拟分析.研究结果表明:以简化模型为基础,仅利用生产厂家为用户提供的产品在标准测试条件(STC)下测出的I∝、V∝、Im、Vm作为参数,能以较高的精度计算出太阳电池的,I-V特性,为太阳电池数学模型的工程应用提供了可能.     

Two-Step Precise Determination of the Parameters of the Single-Diode Equivalent Circuit Model for Dye-Sensitized Solar Cells

In this work, a two-step method to determine all the five parameters of the single-diode equivalent circuit model for dye-sensitized solar cells with high accuracy is demonstrated. With the five parameters extracted by the graphic method as the initial values, the accurate values of the five parameters are obtained by nonlinear least squares fitting. The accuracy of the two-step method is validated by fitting several I-V characteristics of dye-sensitized solar cells both from our experimental results and from other research groups. The root mean square errors of all the fitting results by the two-step method are less than 1%.     

辐射对太阳电池光电输出性能影响的定量研究

该文定量研究电子和质子辐射对太阳电池输出特性的影响。首先,证实作者前期工作得到的太阳电池输出电流-电压（I-V）模型仍适用于高能粒子辐射后的太阳电池;其次,由太阳电池输出电流-电压特征量定义一个等效电阻（Req）。采用最小二乘方曲线拟合方法,找到能够定量描述太阳电池能量转化效率（PCE）与等效电阻（Req）的关系,并且定量解释了经历电子和质子辐照的太阳电池的等效电阻（Req）同辐照剂量的关系。最后,扩展这个模型用于定量描述太阳电池外量子效率（EQE）与入射光子能量（hν）的关系,经拟合验证,该模型与实验数据十分吻合,理论同实验结果的相关系数R大于0.98,平均相对误差（ARE）小于3%。     

Questionable effects of antireflective coatings on inefficiently cooled solar cells

A model for temperature effects in p–n junction solar cells is introduced. The temperature of solar cells and the losses in the solar cell junction region caused by elevated temperatures are discussed. The model developed is examined for low-cost silicon solar cells. Plots of output power and efficiency as functions of the time throughout the day are presented. In order to improve the shape of the output power and efficiency curves throughout the day the coherence between technical parameters of the solar cells and the climate in the operation region is observed and examined. It is shown how the drop in output power around noon can be avoided by fitting technical parameters of the solar cells to the climate.     

CELLO: an advanced LBIC measurement technique for solar cell local characterization

An advanced light beam-induced current measurement for solar cell local characterization, called CELLO, has been developed and tested on mono- and multi-crystalline Si solar cells. A solar cell is illuminated at near 1.5 AM light intensity, and is additionally subjected to intensity modulated scanning local illumination by a focused IR-laser. The linear response (current or potential) of the solar cell is measured for various fixed global conditions (different preset voltage or current values) during scanning. A large number of independent data with high spatial resolution are obtained. Applying an advanced fitting procedure to these data yields a set of local parameters for each point on the solar cell. This gives information on the spatial distribution of the photo current, the series and shunt resistance, the lateral diffusion of minority carriers, the quality of the back surface field, and even allows the calculation of local IV curves. The theoretical and experimental approach to this technique will be discussed, and the applicability of this new solar cell characterization tool will be demonstrated.     

Computer simulation of amorphous MIS solar cells

A computer model to simulate amorphous MIS solar cells is developed. The model is based on the self-consistent solution of the electron and hole continuity equations, together with the Poisson equation under proper boundary conditions. The program developed is used to investigate the cell performance characteristics in terms of its physical and structural parameters. The current-voltage characteristics of the solar cell are obtained under AM1 solar illumination. The dependences of the short-circuit current, open-circuit voltage, fill factor and cell conversion efficiency on localized gap state density, carrier lifetime, cell thickness and surface recombination velocity are obtained and discussed. The results presented show how cell parameters can be varied to improve the cell performance characteristics.