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A photovoltaic powered electrolysis converter system with maximum power point tracking control
摘要： One of the main problems for renewable and other innovative energy sources is the storage of energy for sustainability. This study focuses on two different scenarios to benefit from solar energy more efficiently. Photovoltaic (PV) energy is converted to the desired voltage level using a buck converter for generating hydrogen with electrolysis process. A maximum power point tracking (MPPT) algorithm is used to benefit from the photovoltaic sources more efficiently. The basic electrolysis load for hydrogen production needs low voltage and high current and controlled sensitively to supply these conditions. The photovoltaic powered buck converter for electrolysis load was simulated in MATLAB/Simulink software using a perturb and observe (P and O) MPPT algorithm and PI controller. The simulation results show that in normal, short circuit and open circuit working conditions the PV and load voltages are stabilized. The efficiency of the proposed system is reached more than 90% for high irradiance levels.
关键词： Maximum power point tracking,Electrolysis process,Hydrogen energy generation from PV,DC-DC buck converter,Perturb and observe method,Proportional integral control
更新于2025-09-23 15:19:57
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Study on the Energy Saving Potential for Semi-Transparent PV Window in Southwest China
摘要： To study Semi-Transparent photovoltaic (STPV) windows, experiments were conducted to test the energy potential of STPV window installed in buildings. Two identical rooms were built up as experimental units; one was fitted with amorphous silicon (a-silicon) photovoltaic (PV) windows, and another was fitted with a conventional window. The interactional influence was analyzed among air conditioning energy consumption, lighting energy consumption, and energy generation. It can be concluded that STPV windows could provide 0.26 kWh/per day and save 29% on comprehensive building load on a typical sunny day. In order to further investigate, buildings installed with STPV windows in four typical cities with different climate environments in southwest China were simulated and analyzed. The cooling load of the buildings were all decreased while the heating energy consumption and lighting energy consumption were lightly increased. The energy generation of STPV windows was highest in Lhasa at 402.1 kWh/year. The energy saving potential of STPV windows was predicted with good values; 54% in Kunming.
关键词： electricity consumption,southwest China,building integrated photovoltaic (BIPV),STPV window,energy generation
更新于2025-09-19 17:15:36
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Reliable energy prediction method for grid connected photovoltaic power plants situated in hot and dry climatic condition
摘要： This paper presents a mathematical model to predict the energy generation of photovoltaic power plant in hot and humid climatic condition. This model is based on meteorological data and laboratory tested solar module parameters with twenty-four inputs and one output. In addition the twenty-four inputs drive an equation to calculate final energy generation from photovoltaic power plant. Validation of the proposed model was done by comparing the results of predicted energy generation using proposed model and PVWATT software model for two existing PV power plants of India. Monthly and annual energy production and errors will be the main criteria for the selection of batter model. The result shows that in comparison with PVWATT software proposed model was found to be more efficient and accurate to predict energy generation and proposed model also reduces mean absolute percentage error and root mean square error significantly compared to PVWATT software for hot and humid climatic condition.
关键词： PV power plant,Climatic condition,India,Mathematical method,Prediction model,Energy generation
更新于2025-09-19 17:13:59
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Defect-free Laser Powder Bed Fusion of Ti-48Al-2Cr-2Nb with a high temperature inductive preheating system
摘要： In the industrial panorama, Laser Powder Bed Fusion systems enable the near net shaping of metal powders into complex geometries with unique design features. This makes the technology appealing for many industrial applications, which require high performance materials combined with lightweight design, lattice structures and organic forms. However, many of the alloys that would be ideal for the realisation of these functional components are classified as difficult to weld due to their cracking sensitivity. γ-TiAl alloys are currently processed via Electron Beam Melting to produce components for energy generation applications. The Electron Beam Melting process provides crack-free processing thanks to the preheating stages between layers, but lacks geometrical precision. The use of laser powder bed fusion could provide the means for higher precision, and therefore an easier post-processing stage. However, industrial Laser Powder Bed Fusion systems employ resistive heating elements underneath the base plate which do not commonly reach the high temperatures required for the processing of γ-TiAl alloys. Thus, elevated temperature preheating of the build part and control over the cooling rate after the deposition process is concluded are amongst the features which require further investigations. In this work, the design and implementation of a novel inductive high temperature Laser Powder Bed Fusion system to process Ti-48Al-2Cr-2Nb is presented. Specimens were built with preheating at 800 °C and the cooling rate at the end of the build was controlled at 5 °C/min. Crack formation was suppressed and apparent density in excess of 99 % was achieved.
关键词： High Temperature,Preheating,TiAl,Laser Powder Bed Fusion,Energy generation
更新于2025-09-19 17:13:59
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Recent advances in carbon quantum dot (CQD)-based two dimensional materials for photocatalytic applications
摘要： CQDs are a new class of carbon material with ultrafine sizes and readily tunable optical properties, which make them extremely intriguing. CQDs have gained widespread attention due to their potential and versatility, and they can be applied in many different fields. One of their many applications is photocatalysis, which has garnered incessant research interest in recent years. State-of-the-art technology utilizes sustainable solar energy, which is both clean and virtually inexhaustible. To date, the photocatalytic performance of CQDs in their raw form is still far from ideal. Nevertheless, they can be substantially enhanced through several modification techniques. In this review, strategies to improve the photocatalytic performance of CQDs, such as size-tuning, surface passivation and functionalization, and elemental doping, are extensively discussed. The review also covers the latest advances in the use of CQDs in photocatalysis to address both environmental and energy-related issues. Particular emphasis is placed on the formation of 0D/2D heterojunction nanocomposites with several 2D materials, such as graphene, graphitic carbon nitride, metal oxides and metallates, metal oxyhalides, transition metal oxides and chalcogenides. The hybridization routes to binary nanocomposites, and their photocatalytic application to carbon dioxide reduction, hydrogen production, and dye and pollutant degradation, are thoroughly reviewed in this paper.
关键词： Two-dimensional materials,Photocatalysis,Energy generation,Carbon quantum dots,Environmental remediation,Heterojunction nanocomposites
更新于2025-09-16 10:30:52
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[ACM Press the 4th International Conference - Moscow, Russian Federation (2018.06.25-2018.06.27)] Proceedings of the 4th International Conference on Frontiers of Educational Technologies - ICFET '18 - Implementation and Statistics of Photovoltaic (Pv) Diesel Hybrid Solar System In Commercial Buildings of Pakistan
摘要： Pakistan is well known developing country in the world with a population of around 200 Million [1] with annual growth of 2.61 % [1] in 2017 and the energy demand gap of electrical power generation is 4500 to 5500 MWH [2] due to which a lot of load shedding occurs to cover the shortfall of energy crisis. This trend of energy crisis should be overcome and reduce by promoting solar system which can be drive independently with the help of generator sets by PV diesel hybrid solution. Environmental to non- protection concerns are gradually conventional generation of power in the whole world. Renewable energy sources (RES) with advanced technology plays a vital role in that sustainable increasing energy demand and burning of natural resources such as fossils fuels, coal etc. in the context of such environmental issue [3]. The renewable energy sources such as solar PV system is eco-friendly and less maintenance electrical power generation technique which can be synchronize with generator set to minimize the consumption of gas or diesel in the generator or shutdown the one generator in peak hours of solar system to reduce the cost of fuels of generator such as gas, diesel and other resources and decrease the foot prints of carbon dioxide from the environment. In this research paper the 200 kWp PV diesel hybrid solar system in Dream world resort Karachi Pakistan has been analyzed. This paper provides the working principal of PV diesel hybrid system and the energy generation from simulation report and the online portal that is realistic energy generation at site and the reduction of carbon dioxide foot prints from the environment in comparison of different energy generation resources.
关键词： Energy,Generation,Hybrid,environment,Gensets,Green Energy,Carbondioxide,Photovoltaic,Diesel
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Performance of photovoltaic systems integrated in buildings (BIPV): a case study on campus Itaperuna of the Fluminense Federal Institute Brazil
摘要： This article analyzes the energy generation of a photovoltaic system integrated on the rooftop of buildings at the Itaperuna Federal Fluminense Institute (IFF) campus, Rio de Janeiro, Brazil. The simulations were conducted on the PVSyst software (test version). The azimuthal positions of the buildings, the slope of the roof and the geographic location were considered, considering a system of 18.48 kWp. The results revealed that the system installed in scenario III is the one that presented best performance, considering an integrated installation to the architecture.
关键词： Azimuthal positions,Photovoltaic system,Buildings,Energy generation,Geographic location
更新于2025-09-12 10:27:22
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The Role of Photovoltaics (PV) in the Present and Future Situation of Suriname
摘要： The aim of this paper is to give an overview of the energy sector and the current status of photovoltaic (PV) systems in Suriname and to investigate which role PV systems can play in this country’s future energy transition. At this moment, 64% of the power is available from diesel/heavy fuel oil (HFO) gensets while 36% is available from renewables namely hydroelectric power systems and PV systems. Suriname has renewable energy (RE) targets for 2017 and 2022 which already have been achieved by this 36%. However, the RE target of 2027 of 47% must be achieved yet. As there is abundant irradiance available, on an average 1792 kWh/m2/year and because several PV systems have already been successfully implemented, PV can play an important role in the energy transition of Suriname. In order to achieve the 2027 target with only PV systems, an additional 110 MWp of installed PV capacity will be required. Governmental and non-governmental institutes have planned PV projects. If these will be executed in the future than annually 0.8 TWh electricity will be produced by PV systems. In order to meet the electricity demand of 2027 fully, 2.2 TWh PV electricity will be required which implies that more PV systems must be implemented in Suriname besides the already scheduled ones.
关键词： photovoltaics systems,electric energy generation,energy transition,renewable energy,Suriname
更新于2025-09-11 14:15:04
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Intrinsically stable organic solar cells under high-intensity illumination
摘要： Organic photovoltaic cells are now approaching commercially viable efficiencies, particularly for applications that make use of their unique potential for flexibility and semitransparency1–3. However, their reliability remains a major concern, as even the most stable devices reported so far degrade within only a few years4–8. This has led to the belief that short operational lifetimes are an intrinsic disadvantage of devices that are fabricated using weakly bonded organic materials—an idea that persists despite the rapid growth and acceptance of organic light-emitting devices, which can achieve lifetimes of several million hours9. Here we study an extremely stable class of thermally evaporated single-junction organic photovoltaic cells. We accelerated the ageing process by exposing the packaged cells to white-light illumination intensities of up to 37 Suns. The cells maintained more than 87 per cent of their starting efficiency after exposure for more than 68 days. The degradation rate increases superlinearly with intensity, leading to an extrapolated intrinsic lifetime, T80, of more than 4.9 × 107 hours, where T80 is the time taken for the power conversion efficiency to decrease to 80 per cent of its initial value. This is equivalent to 27,000 years outdoors. Additionally, we subjected a second group of organic photovoltaic cells to 20 Suns of ultraviolet illumination (centred at 365 nanometres) for 848 hours, a dose that would take 1.7 × 104 hours (9.3 years) to accumulate outdoors. No efficiency loss was observed over the duration of the test. Overall, we find that organic solar cells packaged in an inert atmosphere can be extremely stable, which is promising for their future use as a practical energy-generation technology.
关键词： energy-generation technology,stability,organic photovoltaic cells,lifetime,high-intensity illumination
更新于2025-09-11 14:15:04