低倍V形面太阳聚光器的研究

根据普通V形面太阳聚光器的聚光特点,从现有电池板的宽度入手,分析了反射面安装倾角与反射面所需宽度及聚光比的关系。依照这些关系式,提出用多片反射面增加聚光装置聚光比的措施,以增加发电量,降低光伏发电成本。     

一种低倍聚光光伏系统的实验研究

提出一种拟抛物面聚光器,利用廉价的聚光器来代替电池组件,以此来降低成本。此聚光系统采用光电跟踪方法使聚光器始终正对着太阳。建立了实验系统,并通过实验分析此聚光光伏系统的性能。     

考虑太阳张角的聚光器设计北大核心CSCD

通过聚光等形式提高光能密度,减少光伏材料的使用量,有助于保护环境和节约能源。文章提出一种新型聚光器设计方案,其在分析太阳张角对光路影响基础上,对聚光器模型进行改进,并得到接收器上反射光线分布规律。根据节省材料比和聚光硅电池效率选取聚光器参数,建立聚光器三维模型,在TracePro软件中进行仿真,得到接收器表面的辐照度分布和总光通量,与传统光伏聚光器聚光效果对比,验证聚光器模型的有效性,为聚光光伏发电系统的实物设计奠定了理论基础。     

光伏聚光器的研究现状及发展趋势

介绍了聚光光伏系统降低发电成本的原理和光伏聚光器的研究现状。总结了光伏聚光器的分类方法和工作原理,并详细介绍了几种混合聚光器的性能特点。讨论了设计光伏聚光器时需要考虑的因素。最后介绍了新型聚光器的工作原理和特点,分析了光伏聚光器的发展趋势。     

槽式太阳聚光器的研究

提出了一种低倍聚光的抛物面槽式聚光光伏发电方式.从聚光器的聚光比入手,推导抛物面槽式聚光的能流聚光比的公式,分析了能流聚光比和各个参数的关系.依据这些关系式制成的低倍聚光装置适宜于普及,可节约光伏装置成本,增加光伏发电量.     

蝶式聚光光伏发电刍动跟踪太阳装置的设计

在分析太阳运行规律的基础上,描述了蝶式聚光器的机械结构、传动机构及自动跟踪控制的原理、方法,提出了一种在聚光条件下太阳跟踪的新方案。该蝶式反射聚光光伏自动跟踪太阳装置制造和运行成本低,跟踪精度较高,应用前景广阔。     

聚光光伏发电国内外研究现状

从国内外聚光光伏发电技术的主要研究方向入手,分别介绍了聚光倍率、聚光器、太阳能跟踪方式、冷却与热管理系统4方面的研究现状,展望了太阳能聚光光伏技术的应用前景。     

蝶式聚光光伏发电自动跟踪太阳装置的设计

在分析太阳运行规律的基础上,描述了蝶式聚光器的机械结构、传动机构及自动跟踪控制的原理、方法,提出了一种在聚光条件下太阳跟踪的新方案.该蝶式反射聚光光伏自动跟踪太阳装置制造和运行成本低,跟踪精度较高,应用前景广阔.     

两级聚光光伏系统中砷化镓电池特性的实验研究

针对一般聚光系统中光斑不均匀而导致电池性能下降的问题,设计并搭建了具有二级聚光器的碟式聚光光伏发电系统,介绍了系统的结构及工作原理,进行了户外实验。在相同聚光比条件下(150X),与单级聚光系统相比,三结砷化镓光伏电池的平均峰值功率为1.515 W/cm2,平均效率为29.29%,平均峰值功率和平均效率分别提高了23.32%和9.12%。     

常规单晶硅太阳电池在低倍聚光条件下应用研究

利用常规单晶硅光伏电池，在进行输出特性研究的基础上，设计研制出带有非对称复合抛物面聚光器的光伏发电系统。该系统利用聚光器的有效聚光比随季节的变化，使光电池上接收到的太阳辐射量全年相对均衡，结果不仅降低了发电成本而且可改善系统的可靠性。     

串并联太阳能电池弧形光伏组件的发电性能研究

将弧形光伏组件安装在建筑和汽车上获取电能,已受到人们越来越多的关注。为获得更高的输出功率,有必要研究由互连太阳能电池组成的、电流不匹配的弧形光伏组件的特性。研究重点关注由串并联太阳能电池组成的弧形光伏组件的发电性能,设计了不同曲率的非平面微型光伏模块,并通过测量获取光伏模块的参数。与平面光伏模块相比,弧形光伏模块的发电量较小。此外,利用二极管模型分析了光伏模块的特性,说明并联比串联功率高的原因。最后研究了实际应用中太阳能电池的互连问题。结果表明,在理想模型下并联能获取更多电能,但大尺寸的光伏模块会产生更大电流,可能会在实际运行中产生额外损耗。因此,在实际应用中设计弧形光伏组件时也应考虑太阳能电池的互连。     

Assessing the potential of concentrating solar photovoltaic generation in Brazil with satellite-derived direct normal irradiation

With the declining costs of flat plate and concentrating photovoltaic (PV) systems, solar PV generation in many sunny regions in Brazil will eventually become cost competitive with conventional and centralized power generation. Detailed knowledge of the local solar radiation resource becomes critical in assisting on the choice of the technology most suited for large-scale solar electricity generation. When assessing the energy generation potential of non-concentrating, fixed flat plate versus concentrating PV, sites with high levels of direct normal irradiation (DNI) can result in cost-competitive electricity generation with the use of high concentrating photovoltaic systems (HCPV). In large countries, where the transmission and distribution infrastructure costs and associated losses typical of centralized generation must be taken into account, the distributed nature of solar radiation should be perceived as a valuable asset. In this work we assess the potential of HCPV energy generation using satellite-derived DNI data for Brazil, a large and sunny country with a continental surface of 8.5 million km². The methodology used in the study involved the analysis of global horizontal, latitude-tilt, and direct normal solar irradiation data resulting from the Solar and Wind Energy Resource Assessment (SWERA) Project, and an estimate of the resulting electricity production potential, based on a review of HCPV generators operating at other sites. The satellite-derived solar irradiation data, with 10 km × 10 km spatial resolution, were analysed over the whole country, in order to identify the regions where HCPV might present a considerable advantage over fixed plate PV on an annual energy generation basis. Our results show that there is a considerable fraction of the national territory where the direct normal solar irradiation resource is up to 20% higher than the latitude-tilt irradiation availability. Furthermore, these sites are located in the most industrially-developed region of the country, and indicate that with the declining costs of this technology, distributed multi-megawatt HCPV can be a good choice of technology for solar energy generation at these sites in the near future.     

双面组件光伏电站最优容配比的研究

通过对采用双面光伏组件的光伏电站(以下简称"双面组件光伏电站")系统效率损失进行分析,发现在光伏组件-逆变器容配比(下文简称"容配比")变化的情况下,逆变器过载损失对此类光伏电站发电量的影响最大.提出了双面组件光伏电站容配比的优化方法,并以太阳能资源Ⅰ、Ⅱ、Ⅲ类地区的典型城市为例,进行了不同容配比和背景反射率下双面组件...     

非晶硅与晶硅太阳电池在太阳能光伏发电应用中热性能的研究

对在北京地区屋面上固定角度安装(目前光伏发电应用中最常见的安装形式)的非晶硅和多晶硅太阳电池组件进行了近二年的数据采集,纪录了北京地区温度数据和太阳电池阵列的实际发电量,分析了它们各自的特点,为用户更为关心的户外使用情况提供了参考依据;认为如果仅从温度特性考虑,是否采用非晶硅替代晶体硅电池在不同地区应有不同考虑,如果再考虑到人们普遍认为的非晶硅电池没有解决的稳定性问题,表面玻璃的非钢化、效率低等其它问题,非晶硅的使用应慎重,不应盲从.同时在使用中不论何种电池都不应忽视组件的通风问题.     

Performance enhancement of partially shaded solar PV array using novel shade dispersion technique

Solar photo voltaic array (SPVA) generates a smaller amount of power than the standard rating of the panel due to the partial shading effect. Since the modules of the arrays receive different solar irradiations, the P-V characteristics of photovoltaic (PV) arrays contain multiple peaks or local peaks. This paper presents an innovative method (magic square) in order to increase the generated power by configuring the modules of a shaded photovoltaic array. In this approach, the physical location of the modules in the total cross tied (TCT) connected in the solar PV array is rearranged based on the magic square arrangement pattern. This connection is done without altering any electrical configurations of the modules in the PV array. This method can distribute the shading effect over the entire PVarray, without concentrating on any row of modules and can achieve global peaks. For different types of shading patterns, the output power of the solar PV array with the proposed magic square configuration is compared with the traditional configurations and the performance is calculated. This paper presents a new reconfiguration technique for solar PV arrays, which increases the PV power under different shading conditions. The proposed technique facilitates the distribution of the effect of shading over the entire array, thereby, reducing the mismatch losses caused by partial shading. The theoretical calculations are tested through simulations in Matlab/ Simulink to validate the results. A comparison of power loss for different types of topologies under different types of shading patterns for a 4×4 array is also explained.     

Concentrating solar module with horizontal reflectors

A non-sun-tracking concentrating solar module is described that is designed to achieve photovoltaic (PV) systems with higher generation power density. The proposed concentrating module consists of a solar panel having a higher tilt angle than that of a conventional one and with a solar reflector placed in front of the solar panel on a downward inclination angle towards the panel. As a result of this configuration, the solar panel receives reflected as well as direct sunlight so that maximum irradiance and short-circuit current were increased. This configuration is expected to reduce the area required for solar panels, resulting in lower cost PV system.     

透明隔热膜对改善光伏组件温度和发电效率的研究

针对太阳光中的近红外光导致光伏组件温升,进而影响光伏组件发电效率的问题,开展了透明隔热膜在降低组件温度并提高发电效率方面的研究。首先,纳米氧化锡锑(ATO)透明隔热膜具有反射红外光,透射可见光的特点。基于此特点,在实验室将自制的纳米ATO隔热涂料涂布在光伏组件专用玻璃上,在分光光度计下检测样品的可见光、近红外光透过率;其次,分别在太阳能模拟器、室外日光下测试隔热性能以及光伏组件的功率特性。实验测试结果表明:实验室自制的纳米ATO透明隔热膜可有效降低光伏组件的工作温度,从而提高其发电效率和使用寿命。     

Hybrid photovoltaic/thermal solar systems

We present test results on hybrid solar systems, consisting of photovoltaic modules and thermal collectors (hybrid PV/T systems). The solar radiation increases the temperature of PV modules, resulting in a drop of their electrical efficiency. By proper circulation of a fluid with low inlet temperature, heat is extracted from the PV modules keeping the electrical efficiency at satisfactory values. The extracted thermal energy can be used in several ways, increasing the total energy output of the system. Hybrid PV/T systems can be applied mainly in buildings for the production of electricity and heat and are suitable for PV applications under high values of solar radiation and ambient temperature. Hybrid PV/T experimental models based on commercial PV modules of typical size are described and outdoor test results of the systems are presented and discussed. The results showed that PV cooling can increase the electrical efficiency of PV modules, increasing the total efficiency of the systems. Improvement of the system performance can be achieved by the use of an additional glazing to increase thermal output, a booster diffuse reflector to increase electrical and thermal output, or both, giving flexibility in system design.     

建筑光伏系统电池姿态与可吸收辐射量的关系

该文探讨了在大气混浊化的趋势下，建筑光伏系统如何加强对散射辐射的吸收，以及在姿态上如何适应太阳辐射的年周期变化和日周期变化，以获得较低的单位电价、较高的场所总发电量和较稳定的输出。在此基础上，对光伏系统在建筑顶面上采用不同姿态方案的单位电价与场所总发电量进行了评价，从中得出了不同纬度和辐射条件下光伏组件在顶面的布置方式。     

单面和双面单晶硅光伏组件的发电性能实证

针对p型PERC单面单晶硅光伏组件和n型双面单晶硅光伏组件,利用光伏组件户外实证测试系统,分析了2016年12月15日~2018年7月20日期间,上海市嘉定区某屋顶的地面采用白板背景时双面和单面组件,以及水泥背景时双面组件的等效发电时长,并对白板背景和水泥背景时双面组件较单面组件的发电量增益情况进行了分析;计算了组件的PR值;分析了阴天和晴天时组件最大输出功率与组件背板温度、太阳辐照度和环境温度的关系;最后对比了单面和双面组件运行13个月后的衰减值。该实证结果为单面和双面组件的户外实证发电性能提供了数据支撑,并对双面组件较单面组件的发电量增益情况进行了有效证明。