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[IEEE 2019 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) - Sochi, Russia (2019.3.25-2019.3.29)] 2019 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) - Optimization of Attachment Place of Two Photovoltaic Systems to Power Line with Distributed Load
摘要： Distributed generation based on photovoltaic systems is of interest for scientists and specialists, since it has an impact on power losses in distribution networks and voltage deviations at consumers, due to the change in power flows from busbars. The article analyzes the effect of connecting two photovoltaic systems to a power line with a distributed load in terms of power losses. As the objects of research, the systems of power supply to poultry farms were analyzed. Two methods have been proposed for determining the optimal power and places of connection of photovoltaic systems from the obtained analytical expressions for minimum electric power losses in a power line with distributed load, and based on the developed nomogram making it possible to determine approximately different sets of distances and powers of photovoltaic systems.
关键词： optimum active power,losses of electrical energy,grid-connected photovoltaic system,photovoltaic system,power supply diagram
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
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[IEEE 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Xi'an, China (2019.6.19-2019.6.21)] 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Research on the control of three-level photovoltaic grid-connected inverter based on NPC
摘要： For the two stage neutral point clamped three level photovoltaic inverter generation system, the output features of solar cells are analyzed, and the SVPWM control scheme under the 60 DEG coordinate system is analyzed and selected. The control strategy and photovoltaic cell MPPT are simulated using Matlab/Simulink, show the good effect of the control system. Build the experimental hardware platform of DSP+FPGA based on double CPU, the system has a good tracking performance of the power grid voltage, and the system has a fast dynamic response, the output-current sine degree, low total harmonic distortion and realize the unit power factor operation.
关键词： Photovoltaic array,MPPT strategy,Three-level inverter,SVPWM
更新于2025-09-11 14:15:04
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Optimizing Graphene Content in NiSe/Graphene Nanohybrid Counter Electrode on Boosting Photovoltaic Performance of Dye-sensitized Solar Cells
摘要： Nickel selenide (NiSe) nanoparticles were grown onto different mass ratios of graphene nanosheets (GN) to get their corresponding NiSe/GNx (x= 0.25 to 1.00) nanohybrids by a facile in-situ hydrothermal process to integrate the advantages of high specific surface area of graphene and homogeneously immobilized catalytic sites of NiSe. The nanohybrid having the mass ratio of 1:0.50 (i.e., NiSe/GN0.50) exhibited a higher electrocatalytic activity and electrolyte diffusion. Thus, NiSe/GN0.50 exhibited an improved photo-conversion efficiency (PCE) of 12% (? = 8.62%) than the standard Pt (? = 7.68%) based dye-sensitized solar cell (DSSC). This improved PCE mainly originated from the catalytic ability of NiSe and the multiple interfacial electron transfer pathway of graphene, resulting in the enhanced charge transfer and fast tri-iodide reduction kinetics at the counter electrode/electrolyte interface. The results obtained from the cyclic voltammetry (CV), electrochemical AC-impedance (EIS) and Tafel polarization studies validated the synergistic effect of NiSe and GN and the high possibility of this nanohybrid as an efficient counter electrode (CE) for DSSC.
关键词： Photovoltaic performance,Counter electrode,Graphene nanosheets,Nickel selenide,Dye-sensitized solar cell
更新于2025-09-11 14:15:04
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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Optimum design of V-trough solar concentrator for photovoltaic applications
摘要： This paper presents a novel design of V-trough Solar Concentrator (VSC) for low concentrator photovoltaic (CPV) applications. The conventional VSC design comprises of two flat reflectors slanted by an angle and attached to a PV module. The maximum reported concentration ratio (CR) and optical efficiency (OE) of this concentrator are 2x and 89.91%, respectively. This paper demonstrates the process of improving the VSC. The geometrical and optical performance of the conventional VSC were optimized by the theoretical image technique. The experimental CR and OE are increased by 43.50% and 4.32%, respectively. Then, a crossed V-trough design “Pyramid” is suggested to increase the concentrated radiation. Pyramid concentrator boosted the CR, but the OE is dropped. Eventually, a new VSC geometry is proposed and resulted in CR of 4.70x and OE of 91.83%. The new design demonstrates the possibility of obtaining the same CR using a smaller reflector area than conventional and pyramid V-trough configurations, leading to a reduction in production cost. The results show the potential to further improve this type of solar concentrator for photovoltaic applications.
关键词： V-trough Solar Concentrator,solar concentrator design,concentration ratio,photovoltaic applications,optical efficiency
更新于2025-09-11 14:15:04
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[IEEE 2017 IEEE 44th Photovoltaic Specialists Conference (PVSC) - Washington, DC (2017.6.25-2017.6.30)] 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC) - Scalability of the Vector Quantization Approach for Fast QSTS Simulation
摘要： Quasi-static time-series (QSTS) provides the necessary simulation fidelity on the impact that new energy resources would have on a specific distribution system feeder. However, this simulation can often take 10-120 hours for a single study, on traditional computers. The vector quantization approach proposed in [1] demonstrated very attractive computational time reduction for feeders with limited number of input time-series profiles and few distribution system voltage control elements. In this work, we expend on this algorithm and address this issue to model feeders of any complexity while maintaining a high computational time reduction. We demonstrate a 98.7% reduction on a real distribution system feeder with 2969-bus, 3 load/PV profiles, and 8 voltage regulating elements.
关键词： power system simulation,power system planning,photovoltaic systems,smart grid
更新于2025-09-11 14:15:04
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Economic Impact of Substituting Solar Photovoltaic Electric Production for Tobacco Farming
摘要： Solar photovoltaic (PV) technology represents a promising method to prevent dangerous global climate change, however full solar penetration demands substantial surface areas, possibly encroaching on arable land. To avoid repeating the mistakes of previous attempts to convert agricultural land to energy, arable land currently used for crops with known health hazards can be considered for conversion. Tobacco is the leading cause of avoidable death globally, and despite increasingly stringent controls on tobacco, economics provides an incentive to continue tobacco production. However, with the economics of PV ever improving, this study investigates the potential economic benefits of photovoltaic conversion of farms during tobacco's decline. This study analyzes key factors influencing conventional tobacco farming economics in the U.S. over a sensitivity of realistic future values. Then tobacco crop profit is compared to a sensitivity analysis covering the profits of solar PV farming on the same land. The results show that considering existing electric prices, escalation rates, and installed costs, PV farm substitution for tobacco farming makes economic sense in many U.S. cases already. In a case study of North Carolina, 30GW of PV power capacity was found to be economically viable on existing tobacco farms and if conversion took place over 2,000 premature deaths could be prevented from pollution reduction alone. This meets the State's peak summer loads. Land use policies are discussed to facilitate such land use conversions for the benefit of the economy, the environment and human health.
关键词： farming,solar photovoltaic,agriculture,tobacco,economic impact
更新于2025-09-11 14:15:04
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Demand-Side Management of Air-Source Heat Pump and Photovoltaic Systems for Heating Applications in the Italian Context
摘要： Matching demand pro?le and solar irradiance availability is necessary to meet space heating and domestic hot water needs by means of an air-source heat pump and photovoltaic system in a single-family house. Demand-side management, with smart control of the water storage set-point, is a simple but effective technique. Several studies in the literature pursue demand-side matching and self-consumption goals through system adjustments based on the model predictive control. This study proposes a rule-based control strategy, based on instantaneous photovoltaic (PV) power production, with the purpose of enhancing the self-consumption. This strategy exploits the building’s thermal capacitance as a virtual battery, and the thermal storage capacity of the system by running the heat pump to its limit when PV surplus power is available, and by eventually using an electric heater in order to reach higher temperatures. Results of annual dynamic simulations of a building and its heating system show that the proposed rule-based control strategy is able to reduce signi?cantly the energy exchanges between the system and the grid. Despite the enlarged renewable energy share, economic analysis points out the pursuit of the self-consumption goal may lead to a diminution of the economic advantage in the Italian context (Italian weather data and the electric power pricing scheme).
关键词： net-metering,demand-side management,photovoltaic,self-consumption,air-source heat pump
更新于2025-09-11 14:15:04
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Output power behavior of passivated emitter and rear cell photovoltaic modules during early installation stage: influence of light-induced degradation
摘要： The conversion efficiency of passivated emitter and rear cell (PERC) photovoltaic (PV) modules decreases via light-induced degradation (LID). In this study, two models of commercial PERC PV modules were employed. These modules were exposed outdoors until the accumulated solar irradiation reached 687 kW m?2 to investigate their power generation behavior during the early installation stage. The maximum output power (Pmax) finally decreased by 1.52% in one model and by 4.29% in the other model. Pmax of the latter model increased after LID owing to light-induced regeneration under open-circuit conditions. However, power generation in the array of the latter model connected to an electrical power grid was not changed after LID and no recovery was observed. It was found that the extent of degradation and the behavior differ depending on not only the difference in models but also the circuit conditions during exposure. ? 2019 The Japan Society of Applied Physics
关键词： early installation stage,power generation behavior,light-induced degradation,passivated emitter and rear cell,photovoltaic modules
更新于2025-09-11 14:15:04
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Highly efficient perovskite solar cell utilizing a solution-processable tetrabenzoporphyrin hole transport material with p-type dopants
摘要： We demonstrate an efficient hole transporting material (HTM), soluble non-peripherally substituted octahexyl tetrabenzoporphyrin (C6TBPH2), for perovskite solar cells and determine the role of p-type dopants in improving the photovoltaic performance of devices utilizing this C6TBPH2 HTM. By adding p-type dopants, the fill factor and short-circuit current density under a reverse bias scan are improved from 0.20 ± 0.02 to 0.66 ± 0.03 and from 15 ± 2 to 20.8 ± 0.1 mA cm?2, respectively, due to formation of oxidized C6TBPH2 radical cations. Hence, the devices utilizing C6TBPH2 HTM achieve power conversion efficiencies of 15.2%, which are comparable with devices utilizing commercial HTMs fabricated under similar conditions.
关键词： perovskite solar cell,hole transport material,tetrabenzoporphyrin,photovoltaic performance,p-type dopants
更新于2025-09-11 14:15:04