A miniature concentrating photovoltaic and thermal system

A novel miniature concentrating PV (MCPV) system is presented and analyzed. The system is producing both electrical and thermal energy, which is supplied to a nearby consumer. In contrast to PV/thermal (PV/T) flat collectors, the heat from an MCPV collector is not limited to low-temperature applications. The work reported here refers to the evaluation and preliminary design of the MCPV approach. The heat transport system, the electric and thermal performance, the manufacturing cost, and the resulting cost of energy in case of domestic water heating have been analyzed. The results show that the new approach has promising prospects.     

聚光太阳电池户外测试

基于自主搭建的CPV(聚光光伏)户外测试系统,分析500倍聚光条件下,GaAs多结太阳电池的输出特性,寻求改善电池效率的途径,为聚光系统提供方案。通过实验得出:菲涅尔透镜与电池的距离略小于焦距时,电池的效率最高;若引入二级聚光元件,可以提高聚光电池的效率和功率输出,尤其是在出现系统跟踪偏差时更明显;再者优化散热器散热设计也可以提高电池的效率和功率输出。     

电位滴定同时测定磷酸与亚磷酸的两种数据处理方法比较

分别利用ＣＰＶ矩阵和主成分分析两种方法来处理多组分分析中的电位滴定数据，同时测定了亚磷酸原料中磷酸与亚磷酸含量．实验结果表明，主成分分析法的准确度和精密度均优于ＣＰＶ矩阵法．     

协同虚拟样机的信息集成研究

协同虚拟样机的信息集成在整个协同虚拟样机系统工程中起着非常关键的作用，该文首先提出了协同虚拟样机信息集成的总体结构，并详细介绍了该总体结构中各服务层的具体内容及其它们之间的互操作／接口，另外，本文讨论了信息管理模块与协同仿真平台之间的互操作、与各领域工具／应用程序之间的接口。该文对构建协同虚拟样机的信息管理平台有着很好的指导作用。     

CPV（1）分段法在间歇过程中的应用

研究一种批次过程阶段划分方法．首先,将间歇过程数据按照批次方向展开成二维数据,某采样时刻到末采样时刻的数据构成对应于该时刻的数据段．然后对每一数据段进行主元分析,获得第一主元贡献率．最后,采用第一主元贡献率的变化来表征批次内部阶段的转变,对批次过程划分阶段．将该方法应用于青霉素仿真发酵过程,分段结果明显与实际菌体生长阶段一致．将该方法应用于实际的半导体生产过程数据中,分段结果验证了分段理论的有效性．     

计算机泛视觉系统中多传感器信息融合技术研究

建立了航空透明件的超声无损检测系统,把多传感器的检测信息和人的感知信息利用模糊积分进行融合,实现对航空透明件的缺陷识别。实验结果表明,采用多传感器信息融合技术可以降低系统的不确定性,使超声检测与识别系统的性能提高。     

Temperature‐dependent electroluminescence and voltages of multi‐junction solar cells

The spectral electroluminescence of a monolithic triple‐junction solar cell reveals the sub‐cell open‐circuit voltages under variation of temperature and carrier concentration. We present an electroluminescence set‐up that is able to acquire a full spectrum in less than 10 s and give insight into the voltage‐extraction process. The sum of the sub‐cell voltages is in excellent agreement to open‐circuit voltages acquired under concentrated illumination. The temperature‐induced voltage losses are investigated and explained by a bandgap dependent increase in intrinsic carrier concentration. Finally, the accurate extraction of the sub‐cell bandgaps helps to identify a temperature rise with increasing current density. Copyright © 2013 John Wiley & Sons, Ltd.     

Stepwise measurement procedure for the characterization of large‐area photovoltaic modules

In this paper, we present an indoor measurement procedure for characterizing the electrical performance of large aperture photovoltaic modules. Because of the fact that sun simulators, especially for concentrator photovoltaic applications, are strongly limited in the size of the uniformly illuminated area, we developed a measurement procedure that allows characterizing modules with a larger aperture area than the aperture provided by the sun simulator. The procedure is based on the concept of stepwise illumination of the module area and measurement of the corresponding I–V curves—without the need to contact the subunits directly. Using the additionally measured dark I–V curve of the module, the characteristic I–V curve of the full module can be calculated. Copyright © 2015 John Wiley & Sons, Ltd.     

FLATCON® CPV module with 36.7% efficiency equipped with four‐junction solar cells

In this paper we present the application of high efficiency four‐junction solar cells using SOITEC bonding technology under a Fresnel lens optic and in a FLATCON®‐type CPV module. We demonstrate very high performance. The measurement of a sub‐module, consisting of a four‐junction solar cell adjusted under a single Fresnel lens, showed an efficiency of 38.9%. An 829.6 cm² sized FLATCON®‐type CPV module yielded in an efficiency of 35.0% and 36.7% at CSOC and CSTC, respectively. Thus, both, the sub‐module and the CPV module showed record values, which prove the usefulness of high efficiency four‐junction solar cells in CPV applications. Copyright © 2014 John Wiley & Sons, Ltd.     

槽式光伏聚光器能流密度均匀化设计

从理论上推导了常规槽式光伏聚光器能流聚光比的计算模型,分析了该聚光器能流密度极不均匀的原因,探讨了改善聚光器能流密度均匀性的可能性。在此基础上,提出了一种新型聚光器结构形式,即太阳能电池呈V形槽式的抛物槽式聚光器,从理论上推导了新型聚光器结构的能流聚光比计算模型,分析了聚光器参数对能流密度分布的影响。最后通过粒子群优化算法对该新型模型参数进行了优化。计算和优化结果表明,该新型结构的能流聚光比的标准差小于常规聚光器的30%,极大地改善了槽式光伏聚光器能流密度分布。