晶体硅太阳能电池的光伏特性研究

太阳能光伏技术是把太阳的光能转换成电能的主要方式。目前主要的太阳能光伏转换器件有硅太阳能电池,砷化镓太阳电池,燃料敏华太阳电池和薄膜太阳电池等。其中,硅太阳电池是主要技术。对光伏电池输出特性进行深入广泛的研究具有重要意义。在分析太阳能光伏发电的基本原理基础上,研究了太阳能电池的I-V特性、照度特性,然后对光伏实验系统进行了相关的测试。     

基于固定电压法的太阳电池MPPT系统

针对太阳电池的输出特性随环境变化的特点,为提高电池的输出功率和系统效率,提出一种基于固定电压法的太阳电池最大功率点跟踪 (maximum power point tracker, MPPT)控制芯片的设计.其特点是采用模拟电路集成实现,具有结构简单、成本低、性能稳定等特点.芯片在1.5 μm BCD (Bipolar-CMOS-DMOS)工艺下设计实现,仿真验证和芯片测试结果表明,芯片性能与设计预期基本相符.采用该芯片的太阳能供电系统能够实时跟踪太阳电池的最大功率点.     

铁路5G-R基站太阳能供电架构及应用

针对铁路5G专用移动通信(5G-R)系统基站布置密集、单体功耗高的特点,结合铁路无线通信的需求,研究采用太阳能(PV)为5G-R系统基站的射频拉远单元(RRU)设备供电的方案。对比分析5G-R系统RRU设备日用电规律及太阳能电池日发电规律,确定了采用太阳能结合储能与外电源的供电体系,通过比较几种太阳能电池与外电源组合供电架构的经济性与可靠性,推荐采用直流侧切换的供电架构,并进一步提出了采用直流侧智能配电的太阳能供电方案。本研究在保证5G-R系统运行安全可靠的同时,通过采用太阳能供电方式降低了铁路5G-R系统对外电源的需求。     

微波站太阳电池和市电并行供电系统的设计方法

介绍了微波站采用太阳电池与市电并行供电的原理；并行供电系统中太阳电池和蓄电池用量的计算方法；以实例说明了并行供电系统中太阳电池和蓄电池用量明显地减少；最后，讨论了太阳电池与市电并行供电方式的结果。     

太阳能供电在小型基站中的应用探讨

阐述了小型基站采用市电供电的状况,提出小型基站太阳能供电方案,探讨太阳能供电系统组成和设备配置原则,比对太阳能与电网供电经济效益.     

带MPPT的光伏并网系统在家用空调器中的应用

提出一种光伏发电技术应用在家用空调器的设计思想.对太阳电池的输出特性进行研究.在太阳能转移的过程中,系统用到最大功率点跟踪的方法,提高了系统的光伏发电效率.光伏阵列的输出电流进入Buck-Boost变换器,而后通过逆变器变为与电网电压同频、同相的交流电给空调供电.详细分析主电路的工作原理以及MPPT的跟踪原理,转换效率.仿真结果验证了理论分析的正确性.     

基于无人值守地震台站太阳能供电控制系统的研究

地震台站分布范围广,因此为保障地震监测工作顺利开展,需要建立无人值守智能供电控制系统保障地震监测台站长期连续监测运行,拟设计无人值守智能供电控制系统,通过光伏太阳能供电系统为设备正常运行提供电源保障,并对供电系统运行状态进行实时监测?通过无线4G实现对监测数据的实时传输。     

太阳能光伏供电在高速公路监控中的应用

随着能源危机意识的增强,发展太阳能已经是大势所趋。太阳能光伏供电监控系统是利用太阳能组件将太阳能光能直接转换为电能,由监控中心统一控制的直流电源系统,以其节能、运行可靠、维护少、寿命长,且电能益于输送、储存的优势,将广泛的应用于高速公路监控系统中,也是将来道路监控的发展方向。     

一种太阳能供电LED照明系统电路设计

文章以太阳能供电的LED照明系统为研究对象,探讨了其基本构成,重点探讨了太阳能充电控制器的设计及其电路实现。设计了以PWM控制器CS51221为控制核心的充电控制器的电路,探讨了相关元器件参数的计算方法：分析了LED照明驱动系统的组成及其功能,设计了以NCP3066为核心的LED驱动电路、光敏二极管开关电路、PWM波调光电路;完成了简易太阳能供电LED照明系统电路的硬件,并对其功能及工作性能参数进行了测试和分析。结果表明,该LED照明系统满足设计要求,系统运行良好。     

太阳能光伏发电中的电力电子技术应用

太阳能具有永不枯竭、清洁无污染、不受资源分布限制等优点。太阳能光伏发电技术正在全世界获得越来越广泛的应用。独立供电和并网发电是太阳能光伏应用的两个主要领域。本文介绍了它们的系统构成以及现有技术特点。光伏系统中，根据不同的电路拓扑结构。最大功率点跟踪技术的一阶差分算法也得到讨论。最后，本文介绍了一套独立供电的太阳能光伏试验系统，该试验系统实现了太阳能电池最大功率点跟踪技术和高效率的逆变器设计。     

One year of flight data from the PASP Plus experiment

Results from the first year of operation of the PASP Plus flight experiment are given. The experiment consists of sixteen individual solar cell modules on twelve different panels. Both planar and concentrator technologies are represented as well as sev eral different cell types. The orbit is 363 × 2552 km at an inclination of 70°. There are two main purposes of PASP Plus: to determine the interactions between the space plasma and solar arrays biased to ±500 V and to determine the long-t erm radiation performance of a wide variety of solar cell types. © This article is a US Government work and, as such, is in the public domain in the United States of America     

Performance limitations of silicon solar cells

This paper discusses the performance limitations of silicon solar cells which have been identified and investigated using a detailed numerical analysis of solar cell operation. Efficiency limitations are discussed as related to doping densities, minority carrier lifetimes, widths of solar cell regions, surface recombination, antireflecting layers, and ohmic contact stripes. Areas in which improvements can be expected in performance are identified and discussed.     

非晶硅薄膜太阳能电池特性研究

介绍了太阳能电池的工作原理,并给出了太阳能电池的物理模型。设计了室内测试非晶硅薄膜电池输出特性的实验,并对实验结果进行分析。搭建了小型独立光伏发电系统,给出系统的工程设计结构。实验结果表明,太阳能电池的转换效率与室内实验所测得的结果相吻合,证明该系统具有可靠性和高效性。     

New Solar Cell Power Supply System Using a Boost Type Bidirectinal DC-DC Converter

A new solar cell power supply system is presented, in which the boost type bidirectional dc-dc converter and the simple control circuit with a small monitor solar cell are employed to track the maximum power point of the solar array. It is confirmed by the experiment that the new system has sufficiently precise tracking operation performance and satisfactorily high power efficiency. Also, a comparison of the power efficiencies is made theoretically, as well as experimentally, on the new and the conventional solar cell power supply systems. As a result, it is revealed that the new system is superior to the conventional one in the power efficiency.     

New equivalent diagram of solar cells (engineering point of view)

The disadvantages of the equivalent diagram of solar cells in use today are analyzed. The experiments include measurements of solar cell output characteristics under normal operation conditions and also under conditions where the solar cells operate under positive and negative overvoltages. An analysis of the experiments has suggested a new equivalent diagram based on a d.c. voltage source which gives a good approximation for the whole output characteristic of a real solar cell under normal and abnormal conditions. Comparison of the experimental data and results of the theoretical and numerical analysis shows that the suggested equivalent diagram of solar cells may be very useful for analysis of processes in large d.c. systems based on solar cells.     

Amorphous-silicon solar cells

The status of a-Si solar cell technology is reviewed. This review includes a discussion of the types of solar cell structure that are being used in commercial products. An overview of the development efforts under way involving new materials, such as alloys and microcrystalline films, and their impact on device performance is given. The status of stability in a-Si solar cells and projections for costs for large-scale manufacturing facilities are reviewed. The development of markets for a-Si photovoltaics is also discussed     

The interdigitated back contact solar cell: A silicon solar cell for use in concentrated sunlight

The theoretical and experimental performance of an interdigitated back contact solar cell is described. This type of cell is shown to have significant advantages over a conventional solar cell design when used at high concentration levels, namely, reduced internal series resistance, nonsaturating open-circuit voltage, and an absence of shadowing by front surface contacting fingers. The results of a computer study are presented showing the effects of bulk lifetime, surface recombination velocity, device thickness, contact dimensions, and illumination intensity on the conversion efficiency and general device operation. Experimental results are presented for solar illumination intensities up to 28 W/cm².     

Design,fabrication, and analysis of transparent silicon solar cells for multi‐junction assemblies

Transparent silicon solar cells can lead to an increased efficiency of silicon‐based multi‐junction assemblies by transmitting near and below band gap energy light for conversion in a low band gap solar cell. This analysis shows that the maximum efficiency gain for a low band gap solar cell beneath silicon at a concentration of 50 suns is 5.8%, based on ideal absorption and conversion of the photons. This work analyzes the trade‐offs between increased near band edge absorption in the silicon and silicon solar cell transparency. Application of these results to real cases including a germanium bottom solar cell is analyzed, leading to a range of cases with increased system efficiency. Non‐ideal surfaces and real silicon and germanium solar cell device performance are presented. The range of practical system gains may be as low as 2.2 – 1% absolute when compared with the efficiency of a light‐trapped silicon solar cell for 1‐sun operation, based on this work. Copyright © 2012 John Wiley & Sons, Ltd.     

Use of porous silicon antireflection coating in multicrystallinesilicon solar cell processing

The latest results on the use of porous silicon (PS) as an antireflection coating (ARC) in simplified processing for multicrystalline silicon solar cells are presented. The optimization of a PS selective emitter formation results in a 14.1% efficiency multicrystalline (5×5 cm²) Si cell with evaporated contacts processed without texturization, surface passivation, or additional ARC deposition. Specific attention is given to the implementation of a PS ARC into an industrially compatible screen-printed solar cell process. Both the chemical and electrochemical PS ARC formation method are used in different solar cell processes, as well as on different multicrystalline silicon materials. Efficiencies between 12.1 and 13.2% are achieved on large-area (up to 164 cm² ) commercial Si solar cells