基于模糊PID控制的光伏最大功率点跟踪仿真研究

在分析光伏电池伏安特性的基础上,设计了一个模糊PID控制器,以提高光伏发电的性能。仿真结果表明,模糊PID控制能够快速、准确地跟踪最大功率点,避免最大功率点处的振荡,提高了系统稳定性和能量转换效率。     

光伏发电系统中改进型MPPT控制技术研究

对光伏发电系统提出了一种新的最大功率点跟踪（MPPT）控制方法。对固定电压法、电导增量法以及所提的两者的结合方法分别进行仿真,结果表明,所提方法能够快速、准确地跟踪光伏阵列的最大功率点,减少了在最大功率点振荡的能量损失,提高了光伏发电系统的能量转换效率。     

神经网络在光伏发电MPPT的应用研究

研究利用BP神经网络和RBF神经网络实现光伏发电最大功率点跟踪。通过仿真,神经网络能够快速跟踪到光伏电池的最大功率点。为提高泛化性能,对网络进行串联改进。仿真表明：新网络的泛化性能较之前独立网络有所提高,对测试样本的拟合效果也变得更好。     

基于Boost变换器光伏发电MPPT控制方法

在基于Boost变换器的光伏发电系统中,以MCUTMS320F2812为主要控制芯片．采用检测发电系统Boost变换部分输出电流的控制策略,并调节变换器PWM的占空比输出,实现最大功率点更好地跟踪．并通过Mat．1ab／simulink验证该策略的可行性。     

光伏发电技术在建筑供配电中的应用研究

太阳能是新能源和可再生能源的重要组成部分,是缓解当前能源危机的有效途径。光伏发电已成为利用太阳能的主要方式之一。本文针对光伏发电技术在建筑供配电中的应用研究,简述了光伏发电系统组成与工作原理,详细阐述了单轴跟踪系统与最大功率点跟踪(MPPT)技术在光伏发电中的应用,对光伏发电系统的硬件电路进行了优化设计,并根据实际工程案例进行了光伏发电系统的容量计算与分析。实现了光伏发电系统在建筑供配电中的应用。     

基于模糊变步长算法的微生物燃料电池最大功率跟踪控制

针对微生物燃料电池输出效率低的问题,提出一种变步长算法和模糊控制相结合的最大功率跟踪算法。根据满足最大功率的条件,将Boost变换器和微生物燃料电池构成完整系统,通过调节占空比从而实现最大功率跟踪,同时引入扰动观察法（P&O）和电导增量法（INC）组成最大功率跟踪控制器。常规算法受到步长的影响跟踪效果较差,在此基础上通过改进固定步长为变步长,有效提高了算法的动态性能和稳定性。针对算法产生振荡造成的能量损失,将算法和模糊控制结合在一起构成完整的跟踪系统,有效提高了算法的稳定性,减少了能量损失。仿真结果表明：改进的模糊变步长算法较3种常规算法具有更快的收敛速度、更小的波动幅度和跟踪误差。     

基于DCS的光伏发电系统控制方法的研究与实现

由DSP和上位机组成的控制系统具有很好的信号处理和实时控制能力,主控芯片DSP对需要的直流电流、直流电压信号进行采样和平滑处理,得到较为稳定的直流电流和电压采样结果,有利于光伏逆变器最大功率跟踪的实现。上位机通过485总线发送命令控制由2台5kVA光伏逆变器组成的并联系统,使各个单模块在最大功率跟踪和稳流工作模式之间稳定转换。理论分析和实验结果表明该方法对并联系统具有较理想的控制效果。     

铸锭多晶硅电池生产流程及信息跟踪

在新能源开发利用领域硅基光伏材料占有较大比重,其中铸锭多晶硅光伏电池是当前太阳能电池的主要品种。生产多晶硅电池需要经历众多的加工工序,准确有序记录和跟踪物料流向及各工序相关信息是工艺研究和技术改进的基础。就铸锭多晶硅电池片生产流程及各工序信息跟踪问题进行了论述,并对实施信息跟踪时易出现的问题进行了分析。     

基于KNT-SPV02光伏发电系统PLC程序的研究

xx设备是全国职业院校技能大赛指定设备,为了能够更好地服务于职业学校的教学,必须熟练掌握该设备中光伏电池组件的运行原理。本文着重说明了光伏电池组件东西向点动运行PLC程序编写经验和技巧。     

基于相变材料的太阳能PV/T系统性能

利用相变材料（phase change material, PCM）的定温储放热特性，将脂肪酸类PCM填充在装有金属肋片的集热器中，对太阳能光伏（photovoltaic, PV）板进行温度调控，实验分析了不同间歇性热量调控策略下PV/T（photovoltaic/thermal）-PCM系统宏观性能。结果表明：PCM能有效缓解光伏电池的温度波动，但系统运行中PCM的温度分层现象较为严重，制约了其实际利用率；合理的热量调控策略对防止PV/T-PCM系统中光伏电池过热及提升系统性能至关重要，数据显示工况二（调控温度设为45℃，调控时长30 min）和工况三（调控温度设为50℃，调控时长30 min）在调控前后，其光电转换效率分别提升3.4%和2.6%；工况二对应的系统总效率为90.8%，工况三为84.45%，均在工况一（无调控）的基础上有显著提升。     

Flexibility Potential of Photovoltaic Power Plant and Biogas Plant Hybrid Systems in the Distribution Grid

The potential of combining biogas and photovoltaic (PV) power plants in hybrid systems in the German distribution grid is analyzed. The focus of the present research is on balancing the intermittent power supply from PV power plants with the controllable power production of combined heat and power (CHP) units of biogas plants within a period of seconds. To achieve an increase of the total energy feed-in of biogas and PV power plants to the electricity grid, a biogas plant energy management system is described. System parameters, such as the variable feed-in of PV power plants or power ramps of the start-up process of controllable biogas plant CHP unit, are described and adapted to the global installed capacity of PV power plant and biogas plants in the German distribution grid.     

Design of a New Multilevel Inverter Standalone Hybrid PV/FC Power System

This paper analyzes different topologies of hybrid photovoltaic (PV)/fuel cell (FC) power system in standalone applications. Proposed topology with a compact conversion system using less number of power semiconductor, switches will improve hybrid system power quality. The MATLAB SIMULINK tool is utilized to design and develop the proposed system by which voltage regulators common coupling point voltage is controlled and regulated. Simulated results are compared with IEEE 1547 standard to authenticate the effectiveness of the proposed model. The proposed system will be implemented in real time prototype model. The real time prototype model results are compared with simulation results.     

Glasses for solar energy conversion systems

Solar technologies are projected to increase tremendously over the next 10 years. Glasses are playing an important role as transparent materials of photovoltaic (PV) cells and concentrating solar power (CSP) systems. Glasses are materials of short energy payback time and environmental compatibility suitable for sustainable energy concepts. The paper reviews recent solar applications. Surface structuring and coating of glasses are shown to improve energy efficiency for solar conversion systems substantially. Encapsulated glass-to-glass PV modules and solar photocatalytic glass surfaces are identified as elements of a green architecture combining renewable power generating and destruction of air pollutants of urban environments. Emerging solar technologies for power generation, including transparent PV modules, solar chimney and thermoelectric systems may become significant areas of future solar glass applications.     

PV/T集热器优化设计及实验

光伏/光热(photovoltaic/thermal collector,PV/T)集热器是光伏光热系统的关键部件,其性能好坏直接决定着太阳能综合利用率的高低,因此PV/T集热器的设计对光伏光热系统的性能研究有着重要的作用。本文对PV/T集热器结构和传热热阻进行了分析,采用Fluent软件对不同的辐照度、结构尺寸和流量共75种工况下的PV/T集热器的热性能进行了数值模拟;并对PV/T集热器进行了优化设计,根据设计结果搭建了试验台,对PV/T集热器的集热效率与发电效率进行了研究。研究结果表明:集热器内最佳冷却水流量为0.008kg/s,光伏电池和集热面积最佳比D/W=0.4。随着归一化温差的增大,PV/T集热器的光电效率与集热效率均不断降低,光电效率预测值与实验值的最大误差22.5%,平均集热效率0.63,最大集热效率达到0.75。     

Underwater Performance Evaluation of Monocrystalline Photovoltaic Module in Outdoor Conditions and Underwater Spectral Response Study of c-Si Solar Cell

Silicon - Solar photovoltaic (PV) modules submerged underwater can provide useful power to various types of electronic sensors and robotic vehicles, which may be used for scientific research and...     

Enhanced Photovoltaic Performance of PEDOT:PSS/Si Heterojunction Solar Cell with ZnO BSF Layer: A Simulation Study using SCAPS-1D

Silicon - Here, we report an enhanced photovoltaic (PV) performance including open circuit voltage (Voc), short circuit current (Jsc), fill factor (FF) and power conversion efficiency (PCE) of...     

Efficient HgTe colloidal quantum dot-sensitized near-infrared photovoltaic cells

We have demonstrated the successful fabrication of multiple-layer colloidal quantum dot (CQD)-sensitized near-infrared (NIR) photovoltaic (PV) cells using the solution processable HgTe CQDs and poly-3-(hexylthiophene) (P3HT) as hole-conducting polymer. The cells showed a 3.6 fold enhancement in power conversion efficiency under NIR light illumination by the post-ethanedithiol chemical treatment. The performance enhancement was mainly ascribed to the improved interfacial contact between HgTe CQDs by elimination of oleic acid as capping ligand on the surface of HgTe CQDs. In addition, the HgTe CQD-sensitized PV cells could effectively detect weak NIR light and process over 1 kHz level signals.     

Core-shell structured photovoltaic devices based on PbS quantum dots and silicon nanopillar arrays

We fabricated three-dimensional silicon nanopillar array (SiNP)-based photovoltaic (PV) devices using PbS quantum dots (QDs) as the hole-transporting layers. The core-shell structured device, which is based on high aspect ratio SiNPs standing on roughed silicon substrates, displays a higher PV performance with a power conversion efficiency (PCE) of 6.53% compared with that of the planar device (2.11%). The enhanced PCE is ascribed to the increased light absorption and the improved charge carrier collections in SiNP-modified silicon surfaces. We also show that, for the core-shell structured device, the thickness of the shell layer plays a critical role in enhancing the PV performance and around five monolayers of QDs are preferred for efficient hole-transporting. Wafer-scale PV devices with a radial PbS/SiNP heterojunction can be fabricated by solution phase techniques at low temperatures, suggesting a facile route to fabricate unique three-dimensional nanostructured devices.     

Optimization of an Electron Transport Layer to Enhance the Power Conversion Efficiency of Flexible Inverted Organic Solar Cells

The photovoltaic (PV) performance of flexible inverted organic solar cells (IOSCs) with an active layer consisting of a blend of poly(3-hexylthiophene) and [6, 6]-phenyl C₆₁-butlyric acid methyl ester was investigated by varying the thicknesses of ZnO seed layers and introducing ZnO nanorods (NRs). A ZnO seed layer or ZnO NRs grown on the seed layer were used as an electron transport layer and pathway to optimize PV performance. ZnO seed layers were deposited using spin coating at 3,000 rpm for 30 s onto indium tin oxide (ITO)-coated polyethersulphone (PES) substrates. The ZnO NRs were grown using an aqueous solution method at a low temperature (90°C). The optimized device with ZnO NRs exhibited a threefold increase in PV performance compared with that of a device consisting of a ZnO seed layer without ZnO NRs. Flexible IOSCs fabricated using ZnO NRs with improved PV performance may pave the way for the development of PV devices with larger interface areas for effective exciton dissociation and continuous carrier transport paths.     

Sonne oder Wind: Was ist die bessere Energiequelle für Power-to-X

Investment costs dominate almost completely the cost of generating electrical power and the subsequent product X (e.g., hydrogen) based on renewable energy. Duration load curves (DLC) of power generation are needed to compare the economics of different process chains for power generation and utilization. A method for photovoltaic plants has been developed to compare them with the published DLC of wind power plants. The hydrogen product costs as well as the power generation costs have been calculated for two models each. In Germany, onshore wind power plants provide the most cost competitive hydrogen. Even if the power generated by the largest wind power and PV plants in Germany would be completely used for hydrogen production, it could only over a small fraction of the expected hydrogen demand.