共查询到20条相似文献,搜索用时 125 毫秒
1.
槽式聚光太阳能系统太阳电池阵列 总被引:1,自引:0,他引:1
基于槽式聚光太阳能系统分别对单晶硅电池阵列、多品硅电池阵列、空间太阳电池阵列和砷化镓电池阵列进行测试实验.结果表明,聚光后,前3种电池阵列的Ⅰ-Ⅴ曲线都趋于直线,输出功率急剧减少,系统效率下降较快.而砷化镓电池阵列有较好的Ⅰ-Ⅴ曲线,其效率由聚光前的23.66%增加到26.50%,理论聚光比为16.92时,输出功率放大11.2倍,聚光光伏系统中町采用砷化镓电池阵列以提高效率.砷化镓电池阵列Pm、FF和η的温度系数分别为-0.12W/K、-0.10%/K和-0.21%/K,为避免温度的影响须采用强制冷却方式保证电池效率,同时对外供热.研究表明,10片单晶硅电池串联阵列最佳工作时的理论聚光比为4.23;16片空间太阳电池串联阵列最佳工作时的理论聚光比为8.46.研究工作对提高槽式聚光系统效率和大规模利用聚光光伏发电提供了依据. 相似文献
2.
3.
4.
设计良好的减反膜系,提高太阳电池的光电转换效率是太阳电池研制中的一个重要问题.文章从减反膜理论出发,利用计算机软件模拟分析,获得了单层膜、双层膜系反射率百分比与波长的关系,并给出了具体入射波长(即632.8 nm、800 nm)条件下膜的最佳厚度.采用PC1D软件模拟了覆盖减反膜的单晶硅电池的I-V曲线,证实电池转换效率大大提高.研究结果可应用于太阳电池的设计中. 相似文献
5.
针对聚光型太阳能光伏电池能量转换效率和使用寿命受温度影响较大的问题,基于砷化镓半导体吸收式光纤温度传感器,提出一种对聚光光伏发电系统的温度进行实时监测和控制的方法。数值仿真实验结果表明,当冷却水的流速降低、聚光光伏电池工作温度升高时,半导体的吸收波长增加,光纤温度传感系统检测出来的温度较高,这时可以通过节流阀增加冷却水的流速,提高聚光光伏电池与冷却水之间的传热系数,从而降低聚光光伏电池的温度。该方法对于延长聚光光伏电池的使用寿命和提高太阳能的利用率具有一定的理论指导意义。 相似文献
6.
7.
激光光纤供能技术因其安全性和可靠性特别适合应用于电网监测设备的供电中。电网监测对激光光纤供能提出了瓦级功率需求,作为核心组件,具有高光电转换效率的激光光伏转换器对供能系统的长期可靠运行至关重要。基于砷化镓的单PN结光伏转换器可在较低输出功率下获得很好的光电转换效率,但由于开路电压低,增加电流和输出功率会带来高电阻损耗,导致转换效率降低。本文研究了基于单片集成垂直串联多个PN结子电池以提高开路电压和输出功率的方法,并对研制的多结光伏转换器进行了表征测试。测试结果表明,五结光伏转换器的开路电压接近6 V,能以大于54%的转换效率输出5 W功率,且能在较大输出功率范围(约1 W~8 W)保持50%以上转换效率。具体应用中,可根据监测设备的负载功耗和工作条件做进一步优化设计。 相似文献
8.
本文采用MOCVD设备生长了与InP晶格匹配的InGaAs(P)光伏器件。分析了InGaAsP/InGaAs (1.07/0.74 eV)双结太阳电池的QE与I-V特性。在AM1.5D光谱下,InGaAsP/InGaAs双结太阳电池的开路电压,短路电流,填充因子及转换效率分别为0.977 V, 10.2 mA/cm,80.8%,8.94%。对于InGaAsP/InGaAs双结太阳电池,在聚光条件下,其最大转换效率在280个聚光倍数下达到了13%。这一结果预示了GaInP/GaAs/InGaAsP/InGaAs四结太阳电池的潜在应用前景。 相似文献
9.
在综述高倍聚光GaInP/InGaAs/Ge三结太阳电池的研究现状与发展趋势的基础上,对高倍聚光太阳电池的关键技术、性能提升方法和可靠性进行了研究。指出提高隧穿电流和降低串联电阻是高倍聚光三结太阳电池的关键技术,并提出了相应的解决方法。采用多异质结构隧穿结提高了隧穿电流,减小横向扩展电阻和栅线电阻降低了总的串联损耗。此外,通过分别提高GaInP顶电池和底电池禁带宽度、降低InGaAs中电池禁带宽度可进一步提高太阳电池的转换效率。最后探讨了高倍聚光太阳电池的可靠性测试标准。 相似文献
10.
11.
聚光作用下光伏电池阵列性能分析 总被引:1,自引:0,他引:1
Performance of concentrating photovoltaic/thermal system is researched by experiment and simulation calculation. The results show that the I-V curve of the GaAs cell array is better than that of crystal silicon solar cell arrays and the exergy produced by 9.51% electrical efficiency of the GaAs solar cell array can reach 68.93% of the photovoltaic/thermal system. So improving the efficiency of solar cell arrays can introduce more exergy and the system value can be upgraded. At the same time, affecting factors of solar cell arrays such as series resistance, temperature and solar irradiance also have been analyzed. The output performance of a solar cell array with lower series resistance is better and the working temperature has a negative impact on the voltage in concentrating light intensity. The output power has a -20 W/V coefficient and so cooling fluid must be used. Both heat energy and electrical power are then obtained with a solar trough concentrating photovoltaic/thermal system. 相似文献
12.
13.
The analysis of solar cell performance has been done by simulating the external I-V characteristics of n^ /p/p^ single crystal silicon solar cell under high light intensity and 1.5 air mass(AM).This method allows the maximization of solar cell efficiency.To fabricate low-cost n^ /p/p^ single crystal silicon solar cells,solid source of doped phosphorous and boron was used. 相似文献
14.
综述了晶体硅太阳能电池生产线的技术现状,并结合晶体硅电池技术的未来发展方向,分析了晶体硅太阳能电池生产线技术的发展趋势,认为创新工艺及设备、高产能及高效自动化、监控与决策智能化是未来晶体硅太阳能电池生产线的三大主要特征,在此基础上,提出了一种晶体硅太阳能电池智慧生产线,简要介绍了其结构组成,特点及实现。1 相似文献
15.
分别使用掺镓和常规掺硼单晶硅片制备了太阳电池与组件,对电池进行了光照和空焊处理,再采用Halm电池电性能测试仪测试了两种单晶硅太阳电池和组件在光照和空焊实验前后的光电性能.实验结果表明,在相同光照条件下,采用掺镓单晶硅片所制太阳电池的光衰率比用掺硼单晶硅片的低0.91%.空焊后的掺镓单晶硅太阳电池各项光电性能参数的一致性没有出现明显变化,这有利于减少太阳电池之间的失配损失.还发现掺镓单晶硅太阳电池组件的CTM(cell to module)值高于掺硼单晶硅太阳电池组件的CTM值.总之,掺镓单晶硅太阳电池能更好地抑制光致衰减效应,并减小串焊工艺对太阳电池光电性能的影响,获得更高的太阳电池组件功率. 相似文献
16.
17.
J. Appelbaum A. Chait D. Thompson 《Progress in Photovoltaics: Research and Applications》1993,1(2):93-106
The aggregation (sorting) of the individual solar cells into an array is commonly based on a single operating point on the current-voltage (I-V) characteristic curve. an alternative approach for cell performance prediction and cell screening is provided by modelling the cell using an equivalent electrical circuit, in which the parameters involved are related to the physical phenomena in the device. These analytical models may be represented by a double exponential I-V characteristic with seven parameters, by a double exponential model with five parameters or by a single exponential equation with four or five parameters. In this article we address issues concerning methodologies for the determination of solar cell parameters based on measured data points of the I-V characteristic, and introduce a procedure for screening solar cells for arrays. We show that common curve-fitting techniques, e.g. least-squares, may produce many combinations of parameter values while maintaining a good fit between the fitted and measured I-V characteristics of the cell. Therefore, techniques relying on curve-fitting criteria alone cannot be used directly for cell parameterization. We propose a consistent procedure that takes into account the entire set of parameter values for a batch of cells. This procedure is based on a definition of a mean cell representing the batch, and takes into account the relative contribution of each parameter to the overall goodness of fit. the procedure is demonstrated on a batch of 50 silicon cells for Space Station Freedom. 相似文献
18.
19.
20.
In this paper, two factors typical of large photovoltaic (PV) arrays are investigated: one is the current-voltage (I-V) mismatch consequent to the production tolerance; the other is the impact of reverse currents in different operating conditions. Concerning the manufacturing I-V mismatch, the parameters of the equivalent circuit of the solar cell are computed for several PV modules from flash reports provided by the manufacturers. The corresponding I-V characteristic of every module is used to evaluate the behavior of different strings and the interaction among the strings connected for composing PV arrays. Two real crystalline silicon PV systems of 8 times 250 kW and 20 kW are studied, respectively. The simulation results reveal that the impact of the I-V mismatch is negligible with the usual tolerance, and the insertion of the blocking diodes against reverse currents can be avoided with crystalline silicon technology. On the other hand, the experimental results on I-V characteristics of the aforementioned arrays put into evidence the existence of a remarkable power deviation (3%-4%) with respect to the rated power, linkable to the lack of measurement uncertainty in the manufacturer flash reports. 相似文献