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Design and analysis of a hybrid concentrated photovoltaic thermal system integrated with an organic Rankine cycle for hydrogen production
摘要： Solar is one of the most promising energy sources because of the abundance of solar radiation in certain parts of the world. One of the main limiting factors of using traditional photovoltaic cells is that they require a lot of space to generate a significant amount of power. The alternative method, the concentrated photovoltaic (CPV) module, does not utilize the infrared part of the spectrum; thus, the concentrated photovoltaic thermal (CPVT) module was developed. In this paper, the design of a CPVT system coupling with an organic Rankine cycle (ORC) is analyzed where the CPVT thermal receiver acts as a heat exchanger in ORC to generate additional electrical power. The generated power by hybrid CPVT–ORC system is converted to hydrogen by an electrolysis system to store power. The performance of hydrogen production system using an integrated CPVT–ORC power generation system is analytically evaluated, and the results of the modeling and analyses are presented, involving assessments of the influence of varying several design parameters on the rate of hydrogen production. The CPVT and ORC together produce up to 1152 W of electricity under 160 suns solar concentration. When all the electricity is supplied to an electrolyzer, 0.1587 kg of 99.99% pure hydrogen is produced and stored for future use in a fuel cell. The electrolyzer operates at up to 57% efficiency and has an average performance of 725.5 kWh kg?1. The results revealed that coupling ORC to the CPVT enables the system to improve the electrical power generation and consequently diurnal hydrogen production increases up to 30%.
关键词： Concentrated photovoltaic thermal (CPVT),Electrolyzer,Solar energy,Hydrogen,Organic Rankine cycle (ORC)
更新于2025-09-23 15:21:01
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rGO based photo-anode in dye-sensitized solar cells (DSSC) and its photovoltaic characteristics
摘要： On the attempt to increase transport properties of the photo-anode in DSSC, we synthesized rGO powder from graphite bar (commercially available) using modified Hummer’s method. The SEM-EDS results had confirmed the attachment of the rGO layer to the FTO substrate. For DSSC cells, we made two cells configuration, the first one was stacking layers of rGO and TiO2 resulting configuration of TiO2/rGO/ TiO2 (A2) and rGO/TiO2/rGO (A3), where rGO was deposited by spin coating and TiO2 was deposited by a screen printing technique. The second one, the rGO powder was mixed with TiO2 paste with several ratios in weight, namely TiO2:rGO 40:1 (B1), 40:2 (B2), and 40:8 (B3) and then deposited on the FTO substrate by screen printing. The reference cell was assigned as A1 (TiO2 only). From the conductivity measurement using the four-probe method, the utilization of rGO layer increased the conductivity of photo-anode layer, namely (1.37, 2.9 and 6.3)x10-2 Ω-1cm-1 for A1 to A3 and (1.5, 2.5, and 3.7)x10-2 Ω-1cm-1 for B1 to B3. From the photovoltaic measurement, we found that the efficiency of the DSSC cell firstly increased with the insertion of rGO layer, from 1.8% (A1) to 4.59% (A2), and decreased to 3.22%, as the conductivity increased in A3. While for the composite of TiO2:rGO, the efficiency of the cell reduced with the increased amount of rGO, from 3.45% (B1) to 2.9% and 1.9% for B2 and B3. We found that the reduction of photovoltaic performance was affected by two main factors, specifically, direct contact between rGO and redox species in the electrolyte, which induced recombination process, and conductivity of the photo-anode layer. To fully achieve the advantage of rGO utilization in photo-anode, once must be considered was the use of protection layer on top of the rGO layer to avoid direct contact between the rGO/electrolyte interface.
关键词： photovoltaic,rGO,efficiency,photo-anode,DSSC,conductivity
更新于2025-09-23 15:21:01
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Phase-locked Strategy of Photovoltaic Connected to Distribution Network with High Proportion Electric Arc Furnace
摘要： With the rapid development of industrialization, the proportion of electric arc furnaces (EAF) in distribution networks is getting higher and higher. Aiming at the problem that grid voltage is distorted by a large number of arc furnace nonlinear loads accessing to distribution networks, it is crucial to make dynamic analysis of distribution network voltage and adopt a control strategy of grid-connected converter based on the new phase-locked loop (PLL) technology. As a result, the harmonic distortion rate is reduced and the quality of grid-connected current and voltage is improved. In this paper, photovoltaic (PV) system model and the typical dynamic model of the EAF are established. By analyzing the influence of the EAF model on the PV grid-connected converter with the traditional phase-locked loop while connected to distribution network, a control strategy of the PV grid-connected converter with the self-adjusting double SOGI (MAF-SASOGI) phase-locked loop with the ideal low-pass filter is proposed. Through the simulation analysis, it is verified that precise phase locked can be realized and harmonic content of the system can be reduced by the PLL strategy proposed in this paper. Therefore, the quality of PV grid-connected voltage and current is improved.
关键词： Electric arc furnaces (EAF),Photovoltaic(PV) grid-connected,Voltage distortion,Distribution network,Phase-locked strategy
更新于2025-09-23 15:21:01
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[IEEE 2020 IEEE International Conference on Big Data and Smart Computing (BigComp) - Busan, Korea (South) (2020.2.19-2020.2.22)] 2020 IEEE International Conference on Big Data and Smart Computing (BigComp) - Transfer Learning for Photovoltaic Power Forecasting with Long Short-Term Memory Neural Network
摘要： Data-driven modeling is one of the research hotspots of photovoltaic (PV) power prediction. However, for some newly built PV power plants, there are not enough historical data to train an accurate model. Therefore, constructing a forecasting model for the PV plants lacking historical data is an urgent problem to be solved. In this paper, we propose a method to transfer the knowledge obtained from historical solar irradiance data to the output prediction. Firstly, the based on hyperparameters of the long short-term memory neural network (LSTM) are optimized and the weights in the neurons are pre-trained, then fine-tuning the deep transfer model with PV output data. In this way, knowledge can be transferred to PV output data. The from solar experimental results show that the proposed method can significantly reduce the prediction error.
关键词： Long short-term memory,Transfer learning,Photovoltaic power forecasting,Hyperparameter optimization,Data mining
更新于2025-09-23 15:21:01
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[IEEE 2020 International Conference on Artificial Intelligence in Information and Communication (ICAIIC) - Fukuoka, Japan (2020.2.19-2020.2.21)] 2020 International Conference on Artificial Intelligence in Information and Communication (ICAIIC) - Photovoltaic Cell Defect Detection Model based-on Extracted Electroluminescence Images using SVM Classifier
摘要： Electroluminescence (EL) imaging is used to analyze the characteristics of solar cells. This technique provides various details about solar panel modules such as solar cell characteristics, materials used, health status, defects, etc. The derived features from solar panel images provide a significant source of information for photovoltaic applications such as fault detection assessment. In this work, a method for classifying between the normal and a defective solar cell was implemented using EL imaging with selected digital image processing techniques through the Support Vector Machine (SVM) classifier. The EL images are processed using feature extraction procedures. The system was observed to provide an accuracy of 95%. The algorithm presented was implemented in MATLAB R2019b programming environment.
关键词： photovoltaic module,solar panel,and support vector machine.,digital processing,image electroluminescence imaging
更新于2025-09-23 15:21:01
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[IEEE 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - Agadir, Morocco (2019.11.27-2019.11.30)] 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - Optimization of the Energy Lack and Surplus in a Stand-Alone Photovoltaic System
摘要： Renewable energies represent a big interest for different researchers at level. However, the intermittent character of these energies and the storage difficulties of such systems still hinder the emergence of this sector. Consequently, our research aims first to define and analyze different parameters that can contribute in the design of an optimal storage system appropriated to a stand-alone installation. The modeling of whole energy autonomous system important and obviously characteristics particularly the energy Lack and Surplus were analyzed for a specified system in Morocco. Therefore, our study focused on a virtual stand-alone system located in rural area in Errachidia. This system was then designed, the battery was sized, and the lack and surplus were calculated for one year. The goal of this article is consequently to study the optimization of the Lack and Surplus without over or under sizing.
关键词： Storage,Optimization,Lack,Solar energy,Photovoltaic systems,Surplus
更新于2025-09-23 15:21:01
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Improved performance of small molecule organic solar cells by incorporation of a glancing angle deposited donor layer
摘要： improving the photovoltaic performance directly by innovative device architectures contributes much progress in the field of organic solar cells. Photovoltaic device using different kinds of heterojunction with the given set of organic semiconductors paves the way to a better understanding of the working mechanism of organic heterojunction. Here, we report on the fabrication of a new device structure without employing extra material. A thin film of the donor material (chloroaluminum phthalocyanine (ClAlPc)) is inserted between ClAlPc:C60 bulk heterojunction (BHJ) and C60 layer by glancing angle deposition. A ClAlPc/C60 planar heterojunction co-exists with ClAlPc:C60 BHJ simultaneously in this device. Higher efficiency is obtained with this novel device structure. The effects of this additional ClAlPc layer on open-circuit voltage and fill factor in photovoltaic cells are studied. This work provides a new route to improve the device performance of organic solar cells.
关键词： glancing angle deposition,bulk heterojunction,donor layer,organic solar cells,photovoltaic performance
更新于2025-09-23 15:21:01
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[IEEE 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - Agadir, Morocco (2019.11.27-2019.11.30)] 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - A Genetic Algorithm based Improve P&O-PI MPPT Controller for Stationary and Tracking Grid-Connected Photovoltaic System
摘要： this paper deals the performance comparison and efficiencies of single-axis and dual-axis tracking PV system to an identical fixed-mount PV system for two typical clear sunny days (Ghardaia area), two typical days are chosen, the first day in winter and the second day in the summer. For the three types of PV systems, P&O-PI MPPT techniques optimized with a genetic algorithm is proposed. This paper has two different objectives. 1stly, a proposed MPPT technique has been presented to optimize P&O-PI controller via the GA technique to increase the tracking response of MPP with high efficiency and that improves the limitations of the traditional MPPT techniques. 2ndly, a performance comparison of efficiencies of single-axis and dual-axis tracking system and an identical fixed inclination system .Simulation results with MATLAB/SIMULINK are presented and discussed to verify the satisfactory performance of the proposed MPPT control, in which the optimized P&O-PI controller by GA algorithms gives the better performance. The simulation results also have shown that both single-axis and dual-axis are highly efficient in terms of the electrical energy output when compared to the fixed mount system. The results show the effectiveness of the tracking system of about 25% in energy efficiency.
关键词： grid,photovoltaic system,dual‐axis tracking,P&O-PI,fixed array,boost converter,Genetic algorithm,single axis tracking,MPPT control
更新于2025-09-23 15:21:01
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[IEEE 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE) - Cochin, India (2020.1.2-2020.1.4)] 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020) - Improved H-bridge Multilevel Inverter for Grid Integration of Photovoltaic Power Conversion System with Power Quality Enhancement
摘要： This paper proposes an improved H-bridge multi-level inverter in the photovoltaic power conversion system (PPCS) system which is connected to the distribution grid. The power quality is improved with the number of levels and balanced active power sharing between the sources has been achieved. The bidirectional power ?ow is achieved. The two-stage SPVS extracts the maximum power from the solar panels through the incremental conductance (IC) algorithm based control of the DC-DC converter. The system is designed with multi-functional objectives such as reactive power support and load harmonic mitigation in addition with the active power penetration to the grid. The system is modelled and simulated in MATLAB/Simulink platform and the laboratory prototype is developed, and test results are produced for result validation.
关键词： Photovoltaic,Cascaded H-bridge,Maximum Power Extraction,power quality
更新于2025-09-23 15:21:01
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Enhanced photovoltaic effects in ferroelectric solid solution thin films with nanodomains
摘要： Domain structures in polar materials provide an additional degree of freedom to tune ferroelectric photovoltaic (PV) effects. One of the approaches to control domain structures is to form a solid solution with analogs in different symmetries. In this study, we investigate the influence of domain structures on the PV properties of ferroelectric thin films in the xBaTiO3–(1?x)BiFeO3 (BT–BFO) solid-solution system (x = 0.1 and 0.2). We found that a substitution of BT for BFO substantially decreases the domain size down to several tens of nanometers, leading to an enhanced PV response owing to a marked contribution of the domain-wall PV effect.
关键词： solid solution,ferroelectric,photovoltaic,nanodomains,domain-wall PV effect
更新于2025-09-23 15:21:01