Xem 1-20 trên 151 kết quả Photovoltaics
  • The modernization of the world has considerably reduced the prime sources of energy such as coal, diesel and gas. Thus, alternative energy sources based on renewable energy have been the main concentration nowadays to address the world’s energy demand as well as restrict global warming. Solar energy is the main source used to generate electricity through photovoltaic (PV) system. However, the output of PV power is normally intermittent.

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  • The simulation for this purpose will be done using PVSyst V7.0 to estimate the production of the photovoltaic system installation on the building’s rooftop by using the weather data imported from MeteoNorm. Analysis of simulation results confirms the potential of on-site PV system exploitation to provide energy for data center - which is a critical infrastructure in urban area.

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  • The development of electric vehicles (EV) has been a promising field in Vietnam due to its remarkable contribution in reducing fossil fuel consumption and CO2 emissions. This paper can be a recommended input for electrical engineers and investors to consider using this energy source for charging vehicles.

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  • On many parts of the world, solar photovoltaic (PV) systems are currently regarded as one of the best renewable energy (RE) sources in terms of cost of installation, return of investment (ROI), incentives and benefits to users and power grid. PV systems are mostly installed on building rooftop or outdoor locations to increase received sun energy but at the same time assume high possibility of getting struck by atmospheric lightning.

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  • Trong nghiên cứu này, trên cơ sở tổng hợp và phân tích các thông tin/số liệu về sản xuất, sử dụng và quản lý các tấm quang điện mặt trời (Solar photovoltaics Panels, thường được gọi là pin mặt trời-PMT) trên thế giới và ở Việt Nam, một số đề xuất kỹ thuật về lắp đặt và quản lý PMT đã được nhận dạng và đề xuất.

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  • In this paper, a numerical method based on the single-diode model is utilized to forecast the cell temperature and solar irradiance, which greatly relate to the increase of the series resistance. After that, the degradation of PV modules is detected through analyzing the incrementing progress of series resistance of PV modules.

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  • This study suggests the optimized dispatching of the micro-power grid based on the improved particle swarm optimization algorithm (IPSO) for full playing to the power generation advantage of distributed energy. A multi-objective micro-grid model under photovoltaic power generation prediction and load prediction is modeled mathematically for the objective function for optimization. The battery's service life and the lowest economic cost are considered multi-objective criteria for solving the optimization problem by the IPSO algorithm.

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  • This study considered each stage as an individual unit consisting of a programmable logic controller (S7300 PLC) and a closed-loop controlled vector drive (G120). Software simulations performed in the TIA Portal for PLC- Drive communication and WINCC RT professional Software to implement SCADA screens by considering Virtual Inputs from the controller.

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  • Lecture Electronic materials - Lecture 16: Photodiodes, solar cells (photovoltaic devices), and multiple diode analysis provide students with knowledge about diode is assumed on, verify the current calculated flows in the correct direction consistent with the diode being on, only one solution exists for a given model (ideal or CVD).

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  • Porphyrins are an important family of organic chromophores that have attracted attention as photosensitizers in TiO2 -based dye-sensitized solar cells (DSSCs). This brief review is dedicated to comparative studies of phosphonic and carboxylic acid anchoring groups for attachment of porphyrin sensitizers on semiconductors or conductors surface. Here we have selected some representative examples of recently described phosphonate/carboxylate porphyrins with the aim to demonstrate that porphyrin phosphonate should be a promising anchoring group for such systems.

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  • Novel unsymmetrical organic sensitizers having donor, π-spacer, and anchoring groups were designed and synthesized for dye-sensitized solar cell (DSSC) application. The dyes 3-{4-[7-(4-{bis[4-(hexyl)phenyl]amino} phenyl)-11,12-dibutoxy-1,4,5,8-tetrahydrodibenzo [a,c] phenazine-2-yl]phenyl}-2-cyano acrylic acid (KD-148) and 3-{5-[7-(4-{bis[4-(hexyloxy)phenyl]amino} phenyl)-11,12-dibutoxy-1,4,5,8-tetrahydrodibenzo [a,c] phenazine-2-yl]-2-thienyl}-2- cyano acrylic acid (KD-150) were anchored onto TiO2 and tested with ionic liquid electrolyte.

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  • Mixed-phased Inx Sey thin film containing InSe, In2 Se3 and In6 Se7 phases was prepared by M-CBD method and characterized by X-ray diffraction, AFM, optical spectroscopy and J-V measurements. Structural, optical and electrical conductance properties were modified by annealing the films at different temperatures. Optical and morphological properties were also investigated dependently on temperature and concentration of cationic precursor solution.

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  • In this work, boron-doped CQDs (B-CQDs) were synthesized by using boric acid, urea, and citric acid via hydrothermal method to use as a novel additive material for poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) based organic solar cells. The OSCs with an inverted device structure were fabricated on titanium dioxide (TiO2 ) thin film. It was showed the crystallinity, morphological and optical properties of P3HT:PCBM films improved after B-CQDs additive. The best performance was obtained to be a 39.65% of FF, a 546 mV of Voc, an 8.

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  • This article presents optical property, crystal structure, and photovoltaic performance of perovskite solar cell (PSC) in n-i-p structure using simple single-step solution method with antisolvent drip. The fabricated PSC exhibited a relatively high photovoltaic performance with the best power conversion efficiency of 15.8% under forward bias scan.

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  • The graphene-La2CrFeW6 fabricated with an organic-inorganic based CE was also found to be more efficient than those reported in previous works, in which graphene, produced by various methods, was used as a CE material.

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  • ZnO:Ni powders are prepared by forced hydrolysis method. The samples were investigated by using XRD, SEM and photoluminescence (PL) spectra. The intensity of near band gap photoluminescence as a function of doping concentration and temperature was studied. The researching results show the doping concentration of Ni strongly affected the luminescence in the UV spectral region and reveal application potential of ZnO:Ni material in optoelectronic and magneto-optical devices of UV range.

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  • This paper presents a new control strategy for grid-connected Z-source inverter which is a part of the residential photovoltaics (PV) system. The control system consists of a DC control loop, which is designed based on the exact linearization method to guarantee that the DC input voltage of the ZSI quickly tracks the reference value which is given by the maximum power point tracking (MPPT) algorithm.

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  • In order to get a better insight into the relationship between molecular structure and photovoltaic performance, six monoazo dye molecules containing benzoic and cinnamic acid moieties were synthesized and their photovoltaic properties were studied. Three of them have not been previously used in solar cells. Spectroscopic measurements of the investigated compounds coupled with theoretical calculations were performed. Short-circuit current density, open-circuit voltage, and fill-factor were determined.

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  • The 4-(2-[3,4-dimethoxyphenoxy] phenoxy) phthalonitrile was synthesized as the starting material of new syntheses. Zinc, copper, and cobalt phthalocyanines were achieved by reaction of starting compound with Zn(CH3 COO)2 , CuCl2 , and CoCl2 metal salts. Basic spectroscopic methods such as nuclear magnetic resonance electronic absorption, mass and infrared spectrometry were used in the structural characterization of the compounds. Absorption, excitation, and emission measurements of the fluorescence zinc phthalocyanine compound were also investigated in THF.

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  • Photovoltaic technology is an alternative resource for renewable and sustainable energy and low costs organic photovoltaic devices such as bulk-heterojunction (BHJ) solar cells, which are selective candidates for the effective conversion of solar energy into electricity. Asymmetric phthalocyanines containing electron acceptor and donor groups create high photovoltaic conversion efficiency in dye sensitized solar cells. In this study, a new unsymmetrical zinc phthalocyanine was designed and synthesized including thiophene and amine groups at peripherally positions for BHJ solar cell. T

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