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[IEEE SoutheastCon 2018 - St. Petersburg, FL (2018.4.19-2018.4.22)] SoutheastCon 2018 - Evaluation of Reference Generation Algorithms for Dispatching Solar PV Power
摘要： This paper aims to develop a low-cost energy storage system by evaluating reference generation algorithms for dispatching solar power for 1 MW photovoltaic (PV) arrays. Based on battery state of charge (SOC), rule-based algorithms are developed to adjust the grid reference power for each one-hour dispatching period. In this paper, several rule-based algorithms are used to control the SOC of the battery that plays a significant role to design cost-effective energy storage system. The price comparison is made between two kinds of energy storage system (i) Battery only (ii) Battery+ Supercapacitor (SC), where a low pass filter is used to allocate power between battery and SC. The most economical energy storage system is developed through extensive simulations in MATLAB/Simulink environment. The results show that the hybrid energy storage system (HESS), combination of battery and SC, outperforms a battery-only operation.
关键词： intermittent solar energy,high power density,depth of discharge (DOD),state of charge (SOC),high energy density,hourly dispatching
更新于2025-09-23 15:21:01
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[IEEE SoutheastCon 2018 - St. Petersburg, FL, USA (2018.4.19-2018.4.22)] SoutheastCon 2018 - Evaluation of Reference Generation Algorithms for Dispatching Solar PV Power
摘要： This paper aims to develop a low-cost energy storage system by evaluating reference generation algorithms for dispatching solar power for 1 MW photovoltaic (PV) arrays. Based on battery state of charge (SOC), rule-based algorithms are developed to adjust the grid reference power for each one-hour dispatching period. In this paper, several rule-based algorithms are used to control the SOC of the battery that plays a significant role to design cost-effective energy storage system. The price comparison is made between two kinds of energy storage system (i) Battery only (ii) Battery+ Supercapacitor (SC), where a low pass filter is used to allocate power between battery and SC. The most economical energy storage system is developed through extensive simulations in MATLAB/Simulink environment. The results show that the hybrid energy storage system (HESS), combination of battery and SC, outperforms a battery-only operation.
关键词： intermittent solar energy,high power density,depth of discharge (DOD),state of charge (SOC),high energy density,hourly dispatching
更新于2025-09-23 15:21:01
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Tweaking the physics of interfaces between monolayers of buckled cadmium sulfide for a superhigh piezoelectricity, excitonic solar cell efficiency and thermoelectricity
摘要： Interfaces of heterostructures are routinely studied for different applications. Interestingly, monolayers of the same material when interfaced in an unconventional manner can bring about novel properties. For instance, CdS monolayers, stacked in a particular order, are found to show unprecedented potential in the conversion of nanomechanical energy, solar energy and waste heat into electricity, which has been systematically investigated in this work, using DFT based approaches. Moreover, stable ultrathin structures showing strong capabilities for all kinds of energy conversion are scarce. The emergence of a very high out-of-plane piezoelectricity, |d33| ~ 56 pm/V, induced by the inversion symmetry broken in the buckled structure helps to supersede the previously reported bulk wurzite GaN, AlN and Janus multilayer structures of Mo and W based dichalcogenides. The piezoelectric coefficients have been found to be largely dependent on the relative stacking between the two layers. CdS bilayer is a direct band gap semiconductor with its band edges straddling the water redox potential, thereby making it thermodynamically favorable for photocatalytic applications. Strain engineering facilitates its transition from type-I to type-II semiconductor in CdS bilayer stacked over monolayer boron phosphide, and the theoretically calculated power conversion efficiency (PCE) in the 2D excitonic solar cell exceeds 27% for a fill factor of 0.8, which is much higher than that in ZnO/CdS/CuInGaSe solar cell (20% efficiency). Thermoelectric properties have been investigated using semi classical Boltzmann transport equations for electrons and phonons within the constant relaxation time approximation coupled to deformation potential theory, which reveal ultralow thermal conductivity (~ 0.78 Wm-1K-1) at room temperature due to the presence of heavy element Cd, strong anharmonicity (high mode Gruneisen parameter at long wavelength, phonon lifetime < 5 ps), low phonon group velocity (4 km/s) and low Debye temperature (260 K). Such a low thermal conductivity is lower than that of dumbbell silicene (2.86 Wm-1K-1), SnS2 (6.41 Wm-1K-1) and SnSe2 (3.82 Wm-1K-1), SnP3 (4.97 Wm-1K-1). CdS bilayer shows a thermoelectric figure of merit (ZT) ~ 0.8 for p-type and ~ 0.7 for n-type doping at room temperature. Its ultrahigh carrier mobility (μe ~2270 cm2V-1s-1) is higher than that of single layer MoS2 and comparable to that in InSe. The versatile properties of CdS bilayer together with its all-round stability supported by ab initio molecular dynamics simulation, phonon dispersion and satisfaction of Born-Huang stability criteria highlight its outstanding potential for applications in device fabrication and applications in next generation nanoelectronics and energy harvesting.
关键词： Power conversion efficiency,Excitonic solar cell,Piezoelectricity,Photocatalysis,Solar energy,Semiconductor,Thermoelectricity,Carrier mobility
更新于2025-09-23 15:21:01
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Bulk-heterojunction polymer photovoltaic cells manufactured using non-halogenated and non-aromatic solvent
摘要： The use of photovoltaic devices as converters of solar energy into electricity is a relevant technology to the global energy needs and, at the same time, it mitigates the negative impact on the environment caused by conventional sources. Although polymer solar cells are properly considered as clean and renewable source of electricity production, the processing involved in the manufacture of such devices still contains toxic elements. The formation of thin films of active layer in bulk-heterojunction organic solar cells, as example, usually uses halogenated solvents as chlorobenzene (CB), dichlorobenzene (DCB), or chloroform (CF), which represent certain risks of toxicity to the human body and to the environment. This work aims to show that it is possible to manufacture organic solar cells using less-toxic solvents, in special to the environment, whose final efficiency results are similar to those that have been processed by conventional halogenated solvents. With the aid of the Hansen solubility parameters (HSP), we identified non-halogenated and non-aromatic solvent that showed chemical compatibility with donor polymers and acceptor molecules used in the device’s active layer. The fabricated devices were then characterized and their photovoltaic responses compared to the conventional equivalents.
关键词： non-halogenated solvents,polymer solar cells,photovoltaic devices,non-aromatic solvents,solar energy,halogenated solvents,Hansen solubility parameters
更新于2025-09-23 15:21:01
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[Energy, Environment, and Sustainability] Advances in Solar Energy Research || On the Use of Origami for Solar Energy Harvesting
摘要： Reentry vehicles and satellites harness the radiation from the Sun using an array of solar panels. These panels are folded compactly, and are quickly unfolded for operations once the satellite is in outer space. During reentry into the earth’s atmosphere, the solar panels must be folded and re-stowed. For the efficient folding and unfolding of the solar panels, a concept of origami called Miura folding has been utilized, which is achieved with the help of robots. These solar panels have been developed primarily at NASA’s Jet Propulsion Laboratory (Zirbel et al. in Accommodating arrays. ASME. origami-based International design engineering technical conferences and computers and information in engineering conference, vol 6b: 37th mechanisms and robotics conference, 2014). Origami, the art of paper folding involving the creation of two and/or three-dimensional shapes, can be of paramount importance when space is limited and can be used as a compactly stowed system that transforms into a 3D structure with variable functionality. This chapter reviews the attempts made so far by the scientific community in applying the principles of origami in solar panel arrays. A few studies suggest the possibility of using rigid origami in the manufacture of stretchable electronics without employing elastomeric materials. They specifically fabricated origami-enabled stretchable solar cells, which can achieve significant deformability.
关键词： Solar energy,Origami,Solar panels
更新于2025-09-23 15:21:01
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Metal-Doped Copper Indium Disulfide Heterostructure: Environment-Friendly Hole-Transporting Material toward Photovoltaic Application in Organic-Inorganic Perovskite Solar Cell
摘要： In this plan, we use Praseodymium metal-doped copper indium disulfide (Pr-doped CIS) heterostructure as hole-transporting materials (HTMs) in the FTO/TiO2/Perovskite absorber/HTM/Au device. And photovoltaic performance of these Pr-doped CIS heterostructure was investigated in the fabrication of the organic-inorganic perovskite solar cells (organic-inorganic PSCs).
关键词： Pr-coated CuInS2 heterostructure,solar energy,perovskite solar cells,green electricity,hole-transporting material
更新于2025-09-23 15:21:01
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Southerly winds increase the electricity generated by solar photovoltaic systems
摘要： The urgent need to decarbonise energy supplies has prompted exponential growth of solar photovoltaic (PV) systems across the world. As the penetration of renewable energy sources increases, the need to accurately forecast electricity output heightens to ensure efficient energy system operation. While exposure to high temperatures and moisture are known to significantly reduce PV panel efficiency, the effects of wind on both PV panel temperature and electricity output are poorly resolved. Here, meteorological and PV panel production data from Westmill Solar Park, Oxfordshire, were examined to determine the influence of wind, cloud, ambient temperature and relative humidity. We found that, after solar radiation, relative humidity and cloud cover were the dominant controls of PV electricity output; increases in relative humidity and cloud cover were associated with decreased electricity outputs. However, when all other variables were held constant, the mean electricity generated under southerly winds was 20.4 – 42.9% greater than under northerly winds, with the difference greater at higher electricity outputs and attributable to differences in surface cooling capabilities caused by the PV array asymmetry. This finding suggests that PV electricity output predictions could be improved by incorporating wind direction into computer models. Moreover, there is potential to modify solar park design and deployment location to capitalise on wind benefits, especially in areas where panel temperatures are a leading cause of efficiency loss. Ensuring deployments are optimised for site environmental conditions could boost electricity outputs, and therefore profitability, with implications for system viability in post-subsidy markets.
关键词： Solar park design,Solar energy,Panel orientation,Temperature,Wind direction
更新于2025-09-23 15:21:01
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[IEEE 2020 International Conference on Emerging Trends in Smart Technologies (ICETST) - Karachi, Pakistan (2020.3.26-2020.3.27)] 2020 International Conference on Emerging Trends in Smart Technologies (ICETST) - Artificial Intelligence based Nonlinear Integral Back-stepping Control Approach for MPPT of Photovoltaic System
摘要： The energy demand of the world has been intensively increased since last two decades. The need of energy is forcing the think tanks of the developed countries to move towards the alternative energy resources. Solar energy is the most suitable solution to overcome the energy crises. In this regard, this article presents the nonlinear integral back-stepping (IB) control approach for maximum power extraction of stand-alone photovoltaic (PV) system. The proposed control strategy gives robustness against constantly varying conditions of environment. Non-inverting case of buck-boost DC-DC converter is used as interface between load and PV array. Radial basis function neural network (RBFNN) is generated the reference (Vref ) under different climatic conditions for the tracking of the developed control scheme. IB control technique is also checked under faulty conditions. The Simulations are preformed in the environment of MATLAB/Simulink. Moreover, the proposed technique results are compared with perturb and observe (P&O) maximum power point tracking (MPPT) technique.
关键词： Neural network,MPPT,Solar energy,IB
更新于2025-09-23 15:21:01
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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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[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