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[IEEE 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Paris, France (2018.10.14-2018.10.17)] 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Robust Integral Backstepping Approach for MPPT in Different Models of Solar Panel
摘要： In this work, we use the Backstepping controller with integral option to track the maximum power point of a photovoltaic (PV) system. The controller is applied in three cases of the solar panel. In the first case the PV without resistances: series and shunt resistances, while in the second case the PV with series and shunt resistances, the third case consist of PV with constant series resistance, and therefore, shunt resistance values are changed up to plus 50%, without forgetting the variation of the weather conditions solar irradiation and temperature, to check whether the controller is rigor and robust enough. The system under study contains PV associated to a load via DC/DC Boost converter, and we have a Backstepping control design integrated the integral option added to ameliorate the strong control performance of nonlinear controller. The Backstepping strategy for getting the optimal power point and system stability is used Lyapunov’s analysis. The system and the control method is analyzed with a simulation model that was based Simulink/Matlab.
关键词： Lyapunov,DC/DC Boost Converter,Backstepping,MPPT,Photovoltaic
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Information Systems and Computer Science (INCISCOS) - Quito, Ecuador (2018.11.13-2018.11.15)] 2018 International Conference on Information Systems and Computer Science (INCISCOS) - Energy Management of a Solar-Battery Powered Fixed-Wing UAV
摘要： In this work, a hybrid solar-battery feeding system is proposed to achieve a constant output power on a fixed-wing Unmanned Aerial Vehicle-UAV. Firstly, a single and hybrid power source configurations for long endurance UAV applications are exposed. Thus, a solar-battery based feeding system with a suitable energy management is proposed. Furthermore, a Maximum Power Point Tracking (MPPT) technique is selected to achieve the maximum efficiency of the solar photovoltaic (PV) array. Besides, Sliding-Mode Control (SMC) is implemented on a cascade control scheme in order to achieve a suitable energy conversion. Finally, the hybrid feeding system performance is analyzed for different solar radiation and load profiles remarking proper dynamic and steady-state responses.
关键词： unmanned aerial vehicle,maximum power point tracking,fixed-wing,sliding-mode control,Energy management,photovoltaic system
更新于2025-09-04 15:30:14
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Reduction of Forced Outages in Islanded Microgrids by Compensating Model Uncertainties in PV Rating and Battery Capacity
摘要： Energy management systems for islanded microgrids often rely on predictions of energy availability and usage. Such predictions can be used to plan actions, such as shedding non-essential loads, so that critical loads continue to be served. However, uncertainties in the prediction models may lead to incorrect decisions, and subsequently jeopardize reliable operation of the microgrid. For a photovoltaic (PV) and battery based microgrid, uncertainties in the PV rating and the battery capacity model parameters can lead to otherwise avoidable outages. In this paper, techniques have been developed to identify and compensate for such model uncertainties. The approach uses differences between the actual and predicted data sequences to determine compensation factors to improve prediction accuracy. The developed techniques account for operating condition changes automatically, and no additional sensors are needed for their implementation. The method has been evaluated using data from rooftop irradiance and temperature sensors and the corresponding forecasts. It has been shown that the proposed techniques can improve the accuracy of the predictions and hence lead to more effective energy management decisions. Together with a pre-emptive load shedding strategy, the total outage time of the microgrid can be shortened by as much as 11% for the chosen scenario.
关键词： Energy management,photovoltaic systems,prediction model uncertainties,microgrids
更新于2025-09-04 15:30:14
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Comparison of Bifacial Solar Irradiance Model Predictions With Field Validation
摘要： Models predicting rear irradiance for bifacial systems are critical to establish accurate estimates of energy yield. Here, we compare five published bifacial irradiance models, varying clearance, row spacing, tilt, and albedo to measure the sensitivity to these parameters. Bifacial energy gains (BGE) as high as 20% are predicted for some configurations. Model agreement is generally good for low ground clearance (clearance heights lower than 0.75 times the collector width), but at higher clearances, finite system size and edge effects become a significant factor in simulations, stretching assumptions of infinite system extent made in some models. In addition, rear irradiance uniformity is improved at high ground clearance, as expected. A test-bed construction and results are described for comparison between modeled and measured data in Golden, CO, USA. The investigations indicate that model agreement for BGE calculation is better than 2% (absolute) when compared with measured results, depending on the system configuration.
关键词： photovoltaic (PV) system modeling,Bifacial solar panels,irradiance modeling
更新于2025-09-04 15:30:14
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Risk analysis using meteorological weather factors in solar energy conversion systems
摘要： We propose a methodology for conducting simulations of operational scenarios for energy projects based on photovoltaic generation systems. It considers several documented facts about time series of weather, such as strong seasonality and structural breaks, which the previous literature has not explored in depth. Our proposal uses public weather time series, which are usually recorded by meteorological observatories. This makes our approach a suitable strategy for any firm interested in applying it to its own data and projects. This approach also allows the user to set an appropriate level of confidence for the scenarios depending on her interests.
关键词： renewable energy sources,photovoltaic systems,risk measurement,structural breakpoints,horizontal solar radiation
更新于2025-09-04 15:30:14
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Mix and Match: Organic and Inorganic Ions in the Perovskite Lattice
摘要： Materials science evolves to a state where the composition and structure of a crystal can be controlled almost at will. Given that a composition meets basic requirements of stoichiometry, steric demands, and charge neutrality, researchers are now able to investigate a wide range of compounds theoretically and, under various experimental conditions, select the constituting fragments of a crystal. One intriguing playground for such materials design is the perovskite structure. While a game of mixing and matching ions has been played successfully for about 150 years within the limits of inorganic compounds, the recent advances in organic–inorganic hybrid perovskite photovoltaics have triggered the inclusion of organic ions. Organic ions can be incorporated on all sites of the perovskite structure, leading to hybrid (double, triple, etc.) perovskites and inverse (hybrid) perovskites. Examples for each of these cases are known, even with all three sites occupied by organic molecules. While this change from monatomic ions to molecular species is accompanied with increased complexity, it shows that concepts from traditional inorganic perovskites are transferable to the novel hybrid materials. The increased compositional space holds promising new possibilities and applications for the universe of perovskite materials.
关键词： hybrid perovskites,inverse hybrid perovskites,materials design,photovoltaic,DFT calculations
更新于2025-09-04 15:30:14
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Technoeconomic analysis of a grid-connected PV and battery energy storage system considering time of use pricing
摘要： This paper examines the technoeconomic optimization of the size of valve-regulated lead acid-type battery energy storage systems (BESSs) in order to minimize the total annual operating cost of a grid-connected photovoltaic BESS within the framework of system operational constraints, using the improved harmony search algorithm. The electricity cost is calculated using time of use pricing, where the price of energy varies according to the load demand. The concept of feed-in-tari? is discussed, where power can be bought from and sold back to the grid. A sensitivity analysis is performed for three cases: without storage, with storage and without peak load shaving, and with both storage and peak load shaving. The total annual operating cost of the system is calculated for all three cases and cost savings are compared. The simulations, performed with MATLAB, show a good optimization performance.
关键词： technoeconomic analysis,Battery energy storage system sizing,time of use pricing,peak load shaving,photovoltaic system
更新于2025-09-04 15:30:14
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[SpringerBriefs in Materials] Anisotropic Metal Chalcogenide Nanomaterials (Synthesis, Assembly, and Applications) || Applications
摘要： Interest in anisotropic 1D and 2D nanostructures has been steadily increasing due to their large surface area, quantum con?nement effect, and superior optoelectrical or thermoelectrical properties. Anisotropic geometry and size reduction comparable to the Debye length can alter the optical, electric, and magnetic properties of the bulk counterparts. Focusing on MCs prepared in solution the major interests for practical applications are thermoelectric power phases, generation or electronic device cooling, high performance electrodes for batteries, nanocrystal-based photovoltaic devices, and photodetectors. Recently, new potential uses of the solution-based MC nanocrystals are being investigated, which include localized surface plasmon resonance (LSPR) and oxygen reduction reaction (ORR). MC thin ?lms prepared by the vacuum process have shown the possibilities as new class of materials such as topological insulator, semiconductor with a high electron mobility, and superconductor. Although the organic surfactants indispensable in solution chemistry diminish such superior physical properties, solution-based approach has large room to achieve such physical properties. This chapter will introduce recent advances in the practical applications of the anisotropic MC nanocrystals, and introduce brie?y the potential applications.
关键词： thermoelectric,oxygen reduction reaction,photodetector,metal chalcogenides,localized surface plasmon resonance,photovoltaic,superconductor,topological insulator,anisotropic nanostructures
更新于2025-09-04 15:30:14
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Potential, optimization and sensitivity analysis of photovoltaic-diesel-battery hybrid energy system for rural electrification in Algeria
摘要： Integration of hybrid renewable energy systems (HRES) as an electrification solution can enhance the rural electrification situation in Algeria's predominantly remote Saharan regions, where diesel generators are used to provide very basic and limited electricity service. The exploitation of such a solution requires a sustainable, optimized HRES design. This paper presents a methodology both to optimize and to perform a sensitivity analysis of an autonomous hybrid PV-diesel-battery energy system. Particle Swarm Optimization (PSO) and ε-constraint method were used to simultaneously minimize total system cost, unmet load, and CO2 emissions. One optimal solution was chosen among the solutions set and analyzed. The remote Saharan village of Tiberkatine, province of Tamanrasset in southern Algeria was considered as a case study. The hybrid system supplied the energy demand of 20 households. It was found that the optimal solution can supply energy without unmet load, the minimum cost of energy COE is 0.37 $/kWh with 93% renewable fraction. A sensitivity analysis was performed on the optimal system to study the impact of three parameters (load consumption, εCO2, and εLLP constraints) on the system behavior. Finally, a comparative analysis between PSO and HOMER was performed, it was found that the PSO based approach is more cost effective with more PV penetration than HOMER.
关键词： Photovoltaic,Diesel,PSO optimization,Rural electrification,Hybrid renewable energy system
更新于2025-09-04 15:30:14
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An enhanced Dynamic Modeling of PV Module Using Levenberg- Marquardt Algorithm
摘要： An improved dynamic modeling of PV cell/modules based on automatic parameters extraction is proposed in this paper. For the sake of clarity, three models are compared in this study including, Single Diode (SDM), Double Diode (DDM) and the empirical model developed by Sandia National Laboratory (SANDIA). The use of nominal parameters or the values given by manufacturer in both SDM and DDM diode saturation current I0 and photo-generation current Iph equations can engender a significant error depending on the operating conditions and the consumed lifetime. Hence, these values can be handled as model parameters, and can be adjusted using automatic parameters extraction algorithms. Moreover, parameters based on static extraction methods (with fixed irradiation and temperature) namely, Rs, Rsh and n do not give satisfactory results under variable irradiation and temperature, which involve the use of a dynamic adjustment method to improve these parameters. In this way, static parameters extraction using genetic algorithm (GA) is proposed as a first stage for both SDM and DDM. After that, a dynamic parameters extraction based on the Levenberg-Marquardt algorithm (LMA) has been employed in the purpose to adjust some nominal parameters provided by the literature and the manufacturer, and those given by the static method. The idea consists of considering the PV module and the MPPT as a single system with dynamic inputs (irradiation and temperature) and output (Impp, Vmpp and Pmpp) to minimize the error between the measured and the simulated outputs. The validity of the proposed approach is compared with dynamic LMA models, nominal parameters based models, and the models based on static GA extracted parameters under of different weather conditions and out-door measurements. The improved models show promising results in terms of agreement with real data.
关键词： Photovoltaic module,Genetic Algorithm (GA),Dynamic Parameters Extraction,Static Parameters Extraction,Levenberg- Marquardt (LM)
更新于2025-09-04 15:30:14