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Spectral response measurements of each subcell in monolithic triple-junction GaAs photovoltaic devices
摘要： Multijunction photovoltaic devices have gained attention for both solar cells and wireless power transmission. Herein, we present the spectral response of each subcell in a monolithic triple-junction photovoltaic device composed of only GaAs subcells with different thicknesses, which clarifies current matching among the GaAs subcells under simulated solar illumination conditions. In addition, the spectral response curves of each subcell show that the power-dependent spectral responses under laser illumination with wavelengths of 405, 660, and 785 nm are explained by the top GaAs subcell, which has a slightly lower shunt resistance and experiences the effects of luminescent coupling.
关键词： luminescent coupling,photovoltaic devices,spectral response,multijunction,GaAs
更新于2025-09-11 14:15:04
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Single Source Thermal Evaporation of Two-dimensional Perovskite Thin Films for Photovoltaic Applications
摘要： Hybrid two-dimensional (2D) halide perovskites has been widely studied due to its potential application for high performance perovskite solar cells. Understanding the relationship between microstructural and opto-electronic properties is very important for fabricating high-performance 2D perovskite solar cell. In this work, the effect of solvent annealing on grain growth was investigated to enhance the efficiency of photovoltaic devices with 2D perovskite films based on (BA)2(MA)3pb4i13 prepared by single-source thermal evaporation. Results show that solvent annealing with the introduction of solvent vapor can effectively enhance the crystallization of the (BA)2(MA)3pb4i13 thin films and produce denser, larger-crystal grains. The thin films also display a favorable band gap of 1.896 eV, which benefits for increasing the charge-diffusion lengths. The solvent-annealed (BA)2(MA)3pb4i13 thin-film solar cell prepared by single-source thermal evaporation shows an efficiency range of 2.54–4.67%. Thus, the proposed method can be used to prepare efficient large-area 2D perovskite solar cells.
关键词： solvent annealing,thermal evaporation,two-dimensional perovskite,photovoltaic applications,grain growth
更新于2025-09-11 14:15:04
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Proof of concept for a novel and smart shade resilient photovoltaic module
摘要： In this study, the performance of a shade resilient smart module is studied under a dynamic shading pattern. A smart module architecture is developed to mitigate the non-linear shading effect on the module performance. Partial shading decreases the output current of the shaded cells and affects the unshaded cells’ output power. After distributing the module cells into small groups, based on a least square support vector machine optimisation method, DC–DC buck converters compensate the decreased current levels, by adjusting the output current and voltage level from any individual group of cells. The system is simulated in the MATLAB Simulink environment, and the output results are presented. Results show that the module performs efficiently and output power of the unshaded groups of cells never decreased because of the effect of shading on the other groups. Additionally, the maximum output power is harvested from all groups simultaneously. Prototype hardware is designed and built to implement the proof of concept. The real-time results of hardware testing show that the smart module performs as expected and mitigates partially shaded conditions by extracting maximum power from each group, regardless of other groups shading condition.
关键词： least square support vector machine,dynamic shading pattern,MATLAB Simulink,shade resilient photovoltaic module,DC–DC buck converters
更新于2025-09-11 14:15:04
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Fluorine Substituted Benzotriazole Core Building Block Based Highly Efficient Hole Transporting Materials for Mesoporous Perovskite Solar Cells
摘要： Two novel donor-accepter-donor (D-A-D) structured hole transporting materials based on fluorine substituted benzotriazole (BTA) core building block (2FBTA-1, 2FBTA-2) are designed and synthesized through the molecular regulation. Applied these materials into perovskite solar cell (PSC), power conversion efficiencies (PCEs) of 7.55 % and 17.94% are obtained for 2FBTA-1 and 2FBTA-2, respectively. The better photovoltaic performance of 2FBTA-2 could be attributed to its more suitable energy level, more planar molecular configurations and higher hole mobility. Moreover, the devices with 2FBTA-2 as HTM show good stability under the air condition. The results qualify the BTA promising building block for future HTM design.
关键词： perovskite solar cell,photovoltaic,benzotriazole,hole transporting material
更新于2025-09-11 14:15:04
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Preliminary experiment on a novel photovoltaic-thermoelectric system in summer
摘要： Compared with the PV electricity generation, the hybrid Photovoltaic-thermoelectric (PV-TE) can generate more electricity due to its ability to utilize a wider solar spectrum than the PV. The PV-TE employing micro-channel heat pipe array is a novel PV-TE-MCHP system which is capable of providing high cost performance compared to the traditional PV-TE due to the use of the micro-channel heat pipe array. In this paper, the experimental investigation of this new system in summer in Hefei city, China is presented for the first time. The comparison between this system and PV alone is made, and the details are presented. The power output, PV temperature, and the hot and cold sides temperatures of the TE are all tested. The results show that the novel system has a higher electrical output than the PV alone. The electrical efficiencies of this system during the test are all higher than 14.0% and the PV temperatures are about 20 (cid:1)C higher than the ambient temperature. Based on this experiment, the results also verify the feasibility of the new system, which will give a valuable reference for the PV-TE design.
关键词： Micro-channel heat pipe,Power output,Experimental investigation,Photovoltaic-thermoelectric
更新于2025-09-11 14:15:04
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[ACM Press the 2019 International Conference - Shanghai, China (2019.09.20-2019.09.22)] Proceedings of the 2019 International Conference on Robotics, Intelligent Control and Artificial Intelligence - RICAI 2019 - Control and simulation of power balance in optical storage micro-grid based on photovoltaic power supply
摘要： Micro-grid is one of the most effective ways to utilize renewable energy. It is of great significance to study how to realize the energy management of micro-grid and optimize the utilization of energy. Micro-grid is a system unit composed of distributed power generation, energy storage device, energy conversion device, load, control and protection device, etc. It is an autonomous system that can realize self-control, protection and management. Most of the power sources in the micro-grid are distributed power sources, such as wind turbine, photovoltaic power generation, micro gas turbine, fuel cell, super-capacitor, flywheel battery and other energy storage devices. Connecting them to the user end has the characteristics of low cost, low voltage and low pollution, and is the mainstream development direction of the current power system. This paper introduces the composition and control technology of micro-grid, as well as the energy management and simulation of optical storage micro-grid in island and grid-connected mode. In this paper, two modes of island and grid connection are simulated by Simulink. The results show that the optical storage micro-grid system with switching mechanism can effectively improve the utilization rate of photovoltaic power, realize the efficient integration and utilization of distributed power supply, and carry out load side operation management autonomously by switching switch.
关键词： Island mode,Photovoltaic power generation,Grid-connected,Micro-grid,Intelligent control
更新于2025-09-11 14:15:04
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Performance analysis of mono and poly-crystalline silicon photovoltaic modules under Agadir climatic conditions in Morocco
摘要： The evaluation of a solar photovoltaic (PV) technology helps to identify its suitability for a specific location. The main objective of the present study is to assess the suitability of mono-crystalline silicon (mc-Si) and poly-crystalline silicon (pc-Si) PV modules with almost similar characteristics under Agadir climatic conditions. Electricity yield of these modules is calculated from the uninterruptible measured current–voltage curves from sunrise to sunset during a year. The influence of weather conditions, global irradiance and temperature, on the performances of the modules is assessed and as a part of considerations in the PV power plant design that the output power from pc-Si PV modules is found greater. Calculated annual average final yield (Yf), and performance ratio (PR) for mc-Si and pc-Si PV systems are (1602.22 kWh/kWp, 0.71), (1691.85 kWh/kWp, 0.75) respectively.
关键词： Performance,Outdoor monitoring,Photovoltaic,Energy yield,I–V curves
更新于2025-09-11 14:15:04
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Borehole water level model for photovoltaic water pumping systems
摘要： Using photovoltaic energy to pump water from aquifers is an interesting solution to circumvent the low electricity grid coverage and provide improved domestic water access in off-grid areas in sub-Saharan Africa. When pumping and during the lifetime of a pumping installation, the borehole water level changes, which impacts the amount of energy required to extract water from the aquifer. In order to address alterations in energy requirements, this article develops a data-driven borehole water level model adapted to photovoltaic water pumping systems (PVWPS). The proposed model is applicable to all types of PVWPS and aquifers. It has been validated against experimental data from a pilot PVWPS located in a rural off-grid village in Burkina Faso having achieved more than 97% accuracy. Thanks to this borehole model, we have been able to assess the influence of the variability of groundwater resources on both the performance of PVWPS and on their optimal sizing. We show that the variation of the static water level can require a increase of the peak power of the PV modules of up to 100%. Nonetheless, the effect of the drawdown due to the pumping is negligible. This study can help companies, governments and non-governmental organizations to better take into account the variability and the sustainability of groundwater resources in the optimal sizing and monitoring of PVWPS.
关键词： Groundwater resources,Optimal sizing,Sensitivity analysis,Photovoltaic water pumping,Lifecycle cost,Data validated model
更新于2025-09-11 14:15:04
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Particle swarm optimisation-based model and analysis of photovoltaic module characteristics in snowy conditions
摘要： In this study, a novel methodology of photovoltaic (PV) modelling is proposed to represent the instantaneous electrical characteristics of PV modules covered with snow. The attenuation of the transmitted solar radiation penetrating a layer of snow is rigorously estimated based on the Giddings and LaChapelle theory. This theory introduced the level of radiation that reaches the surface of the PV module through the snowpack, significantly affected by the snow properties and thickness. The proposed modelling approach is based on the single-diode-five-parameter equivalent circuit model. The parameters of the model are updated through instantaneous measurements of voltage and current that are optimised by the particle swarm optimisation algorithm. The proposed approach for modelling snow-covered PV modules was successfully validated in outdoor tests using three different types of PV module technologies typically used in North America's PV farms under different cold weather conditions. In addition, the validity of the proposed model was investigated using real data obtained from the SCADA system of a 12-MW grid-connected PV farm. The proposed model can help to improve PV performance under snow conditions and can be considered a powerful tool for the design and selection of PV modules subjected to snow accretion.
关键词： photovoltaic,Giddings and LaChapelle theory,solar radiation,PV modelling,particle swarm optimisation,SCADA system,snow conditions
更新于2025-09-11 14:15:04
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Intelligent approach-based hybrid control algorithm for integration of solar photovoltaic system in smart grid environment
摘要： Integration of solar PV as a distributed generator (DG) require efficient and coordinated control measures for the proper synchronization. In this paper, a hybrid control algorithm for single stage solar photovoltaic (PV) system integrated with low voltage (LV)/medium voltage (MV) grid is proposed. The hybrid algorithm utilizes I cos ? technique and quasi-Newton back-propagation (QNBP) neural network (NN). The main contributions of the present work are: i) support the utility grid by feeding power and connected loads, ii) provide harmonics elimination, reactive power compensation, load balancing, iii) also works in power factor correction (PFC) and zero voltage regulation modes, iv) provides power quality improvement. The proposed control of grid tied PV system provides very fast response during static and dynamic conditions. The obtained results are compared with other well-established algorithms available in the literature. The comparison of the proposed algorithm is done on the basis of various parameters such as DC voltage undershoot and overshoot, settling time and THD in grid currents. The developed system is demonstrated in MATLAB/SIMULINK platform. Using the proposed algorithms there is significant improvement of 1.1% in total harmonic distortion (THD) of source current. The results of proposed controllers are experimentally validated on a developed laboratory protype.
关键词： hybrid control algorithm,power quality improvement,quasi-Newton back-propagation neural network,smart grid,solar photovoltaic system
更新于2025-09-11 14:15:04