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[IEEE 2018 Australasian Universities Power Engineering Conference (AUPEC) - Auckland, New Zealand (2018.11.27-2018.11.30)] 2018 Australasian Universities Power Engineering Conference (AUPEC) - Nano-structured GaAs Solar Cell Design, Simulation and Analysis for Conversion Efficiency Improvement
摘要： This paper discusses nano-structured GaAs solar cell design and analysis for conversion efficiency improvement by increasing the light transmission and absorption, reducing the light reflection. The focus of this research is to construct different type of nano-grating shaped GaAs solar cells with various nano-grating heights and pitches, to compare the simulation results and find a suitable nano-structure that can provide higher conversion efficiency. Finite difference time domain (FDTD) simulation tool is used to simulate and calculate transmission and absorption for different nano-grating shapes, such as, parabolic, triangular, trapezoidal and rectangular. Based on the simulation results, it has been confirmed that the light reflection of parabolic shaped nano-grating structures is higher than triangular nano-grating structures, but it is lower than rectangular and trapezoidal shaped nano-grating structures. Moreover, the simulation results confirmed that the light transmission of parabolic shaped nano-grating structures is about 62.3% having a 200-nm grating height and an 810-nm grating pitch, which is about 22% higher than the rectangular (i.e., flat) type substrates.
关键词： Finite-difference time-domain method,transmission,GaAs solar cells,and absorption,Nano-grating structure,Light reflection,Conversion efficiency,Solar or renewable energy
更新于2025-09-16 10:30:52
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Clustering and dispatching hydro, wind, and photovoltaic power resources with multiobjective optimization of power generation fluctuations: A case study in southwestern China
摘要： Hydropower can be used to smooth out the output fluctuations from power systems including wind and solar sources. This paper proposes a double-layer model for coordinating the operations of cascaded hydropower and neighboring wind and photovoltaic (PV) facilities. In a local complementary model, hydropower with less regulating ability (local complementary hydropower, LCH) is dispatched to alleviate short-term fluctuations (i.e., hourly variations), whereas in the global one, hydropower with greater regulating capacity (global complementary hydropower, GCH) is operated to alleviate long-term fluctuations (i.e., intraday peak-valley differences). The results of a case study of a hydro-wind-PV cluster project in southwestern China show that most (90%) short-term fluctuations can be smoothed by LCH with a minimum impact on the capacity factor (-0.02). In contrast, alleviation of long-term fluctuations can be achieved with GCH, but this causes a large capacity factor reduction (-0.25). The discharge fluctuation of GCH is notably lower (70~75%) than that of LCH. In this system (which includes 5,200 MW wind and 1,400 MW PV), the output fluctuations can be eliminated if hydropower capacity reaches 2,200 MW. These findings demonstrate that clustering of hydropower cascades with wind and solar generation facilities is a promising avenue for the decarbonization of electricity systems.
关键词： renewable energy,integration,complementary mechanism,multiobjective,cascaded reservoirs,clusters
更新于2025-09-16 10:30:52
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Development of a photovoltaic thermal facade system
摘要： A photovoltaic thermal (PVT) collector is made of a photovoltaic (PV) module and a solar thermal collector and thereby delivers electrical and thermal energy at the same time. These systems can contribute significantly to the renewable energy supply of residential, public, and commercial buildings. This paper gives insight into the development of a facade-integrated PVT system within the research project PVT Fassade. Thermal simulations evaluated useful operating conditions and efficiency-decreasing factors. Thus, 10 kg/(hm2) and 60 kg/(hm2) were identified as lower and upper limits for the mass flow and the losses by the internal heat transfer resistance of a 3.5 mm air layer between the PV module and the heat exchanger were determined to 35 % and 48 % for 10 and 60 kg/(hm2). These findings and structural, aesthetical, and general building law requirements were taken into consideration for the design of the facade-integrated PVT system. The functionality and feasibility of the developed system is shown through a constructed prototype facade where an intensive monitoring of the thermal and electrical performance of the PVT system is conducted. The performance of the PVT facade collector is described on the basis of an exemplary day of this monitoring. On this day, an area-specific thermal yield of 4.13 kWh/m2 with a temperature spread of up to 10.7 K is reached. At the same time, the thin film PV modules of the PVT system achieve an electrical yield increase of 2.5 % compared to a reference PV facade system.
关键词： facade-integrated PVT system,electrical yield,thermal simulations,photovoltaic thermal (PVT) collector,renewable energy
更新于2025-09-16 10:30:52
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The use of light filters in the photovoltaic solar power station to improve economic efficiency
摘要： The agriculture and forestry sector require a solution to the problem of energy supply to autonomous consumers. The use of renewable energy sources is relevant worldwide in accordance with environmental requirements. The paper considers the project of a photovoltaic solar power station using light filters to reduce the number of solar panels to provide the required power. The Krasnoyarsk State Agrarian University has developed an experimental setup for studying the characteristics of solar panels using light filters. The aim of the study is to develop a technology for the use of light filters in photovoltaic solar power station and to optimize their operation modes in order to increase the economic efficiency of using autonomous sources for power supply to agricultural consumers. The objectives of the study are the selection and analysis of light filter materials to increase the generated power, substantiate the application of the photovoltaic solar power station for autonomous objects of agriculture and forestry and prove the economic efficiency of the proposed installation. The paper presents the results of a study of the characteristics of solar modules using filters, the main economic indicators are calculated, the economic efficiency of the use of filters is proved. The use of photovoltaic solar power station will ensure a reduction in the cost of electricity generation by 7% compared to existing plants.
关键词： economic efficiency,renewable energy sources,photovoltaic solar power station,solar panels,light filters
更新于2025-09-16 10:30:52
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Assessment of Existing Photovoltaic System with Cooling and Cleaning System: Case Study at Al-Khobar City
摘要： There is no denial that renewable energy is considered to be the most cost-competitive source of clean power in many parts of the world. Saudi Arabia’s vision 2030 aims at achieving the best by using di?erent sources of renewable energy such as solar energy, wind energy, and others. The use of solar energy in particular for power generation will decrease the dependency on oil, and thus, decrease the greenhouse gasses. Solar panels e?ciency tends to decrease with the accumulation of dust on their surface. Thus, a cleaning process requires assigning and employing labor, which increases the cost of running as well as high cost of machinery. The current study focuses on assessing and designing a simple auto self-cleaning system in order to improve the e?ciency of the solar panel. The results showed that for the Al-Khobar region, Eastern Province, Kingdom of Saudi Arabia, the e?ciency of the solar panels after cleaning was increased from 6% to an average of 12% at nominal temperature of 27 C. In addition, the average power output was increased by 35% during the day time. In addition, the normal e?ciency of the solar panels before cooling was between 10% to 15% at 42 C and the e?ciency increased by 7%. Moreover, the output power was increased by 31% with maximum e?ciency of 32% at noon time. After cooling, the temperature of solar cells decreased to 20 C.
关键词： cooling,real case study,e?ciency,photovoltaic systems,renewable energy,cleaning
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 1st International Conference on Energy, Systems and Information Processing (ICESIP) - Chennai, India (2019.7.4-2019.7.6)] 2019 IEEE 1st International Conference on Energy, Systems and Information Processing (ICESIP) - Multifunctional VSC Controlled Solar Photovoltaic System with Active Power Sharing and Power Quality (PQ) Improvement Features
摘要： This paper presents a multifunctional voltage sourced-converter (VSC) controlled solar photovoltaic (SPV) system with a generalized ‘dq’ and adaptive PLL-based include approach to extract the dual features. These enhanced active power sharing feature based on the availability of active power at DC-side collector bus while also serving as an active harmonic filter (AHF). The presented control is computationally less intensive and easy to formulate compared to its conventional counterpart like synchronous reference frame theory (SRFT). The objective of this work is to effectively extract the various ancillary services offered by multifunctional VSC in the power distribution system. The primary function of any grid- connected inverter (GCI) is to serve the active power demand of the load connected at the point of interconnection (PoI) in the power distribution network. However, the multifunctional VSC with presented control approach can also be utilized as AHF to attenuate the rich harmonic content present in source current, to mitigate the load reactive current demand, and to adequately supply the zero sequences harmonic component requirement of the unbalanced and nonlinear load by the fourth leg of the multifunctional VSC. Additionally, the proposed system typically ensures the unity power factor (UPF) operation. An incremental conductance (IC) based control technique is employed to optimize and continuously track the maximum intermittency. The power point usefulness of is demonstrated through transient test cases, conducted in the MATLAB/Simulink software environment. Additionally, its practicality is validated through a comprehensive set of experimental studies investigated on a laboratory developed prototype.
关键词： active harmonic filter,Multifunctional VSC,unity power factor operation,power quality improvement,grid-connected SPV system,renewable energy sources
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Conference on Intelligent Techniques in Control, Optimization and Signal Processing (INCOS) - Tamilnadu, India (2019.4.11-2019.4.13)] 2019 IEEE International Conference on Intelligent Techniques in Control, Optimization and Signal Processing (INCOS) - A Comparative Analysis between UPFC and DPFC in a Grid Connected Photovoltaic System
摘要： In this paper a comparative analysis between Distributed Power Flow Controller (DPFC) and Unified Power Flow Controller (UPFC) integrated photovoltaic system is performed. A grid connected solar generation system with boost converter and voltage source inverter (VSI) is taken as the main model. Due to power quality issues like power oscillations, harmonic distortions, voltage sags and swells, the grid side system has to be perfectly monitored and controlled. One way to mitigate these power quality problems is by using reactive elements like shunt/series reactor and shunt/series capacitor. The disadvantage is sub synchronous resonance phenomenon. Thanks to FACTS technology, which emerged out as power conditioning units and helps to feed power with required standards and free from power quality issues. Among them, the contemporary FACTS devices are Controller (DPFC) and Unified Power Flow Controller (UPFC) .Though the aims of both the devices are same but their working principles are different. In this paper the effect of adding a DPFC and UPFC to a solar PV generation system is analyzed. A detailed working principle and operation of both the devices were presented. At last, MATLAB/SIMULINK environment is used to compare the performances of above mentioned devices.
关键词： FACTS,Renewable Energy,UPFC,Solar PV system,DPFC
更新于2025-09-16 10:30:52
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[IEEE 2019 Third International Conference on Intelligent Computing in Data Sciences (ICDS) - Marrakech, Morocco (2019.10.28-2019.10.30)] 2019 Third International Conference on Intelligent Computing in Data Sciences (ICDS) - Feasibility study of Grid connected Photovoltaic system for electricity generation with peak demand deficit
摘要： Due to great interest in the development of renewable energy technologies in Morocco, this paper studied the performance of a solar photovoltaic grid-connected system located in Rabat, Morocco. Firstly a demand side management strategy has been developed to maximize energy efficiency of the system using a load shifting day-ahead approach. In the second part, an examination of resulted load requirement using a simulation model based on HOMER software is carried out. The analysis of the results has shown that the proposed model is an effective and feasible tool of electricity generation.
关键词： Smart Grid,Optimal generation,Load shifting,Renewable energy,Demand Side Management
更新于2025-09-16 10:30:52
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Day-ahead stochastic coordinated scheduling for thermal-hydro-wind-photovoltaic systems
摘要： With the rapid development of electric power industry, the problem of dispatching renewable energy resources attracts worldwide attention. This paper presents a stochastic scheduling model to study the day-ahead coordination of a multi-source power system. The proposed stochastic scheduling model aims to find a base-case solution with relatively stable operation cost in the presence of uncertain renewable generation. Wind and photovoltaic generation uncertainties are modeled as scenarios using the Monte Carlo simulation method. Considering that wind and photovoltaic generations present complementary characteristics, scenarios are generated with correlations between wind and photovoltaic generations by Copula theory. To better reflect the characteristics of historical wind data, the fluctuation of wind power is also considered when scenarios are generated. The fast scenario reduction method is applied as a tradeoff between accuracy and computational speed. Numerical simulations indicate the effectiveness of the proposed approach in the coordinated scheduling of Thermal-Hydro-Wind-Photovoltaic systems.
关键词： Monte Carlo simulation,Scenarios,Copula theory,Day-ahead scheduling,Renewable energy
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Smart Energy Systems and Technologies (SEST) - Porto, Portugal (2019.9.9-2019.9.11)] 2019 International Conference on Smart Energy Systems and Technologies (SEST) - Modular Architecture with Power Optimizers for Photovoltaic Systems
摘要： Solutions that increase ef?ciency in renewable energy are important for environmental sustainability. In this way, dealing with photovoltaic generation a new architecture constituted by power optimizer for photovoltaic systems emerges. Power optimizer is a DC/DC converter, allocated to each one or two photovoltaic modules, that tries to reduce losses in photovoltaic systems, increasing the photovoltaic power generation. Thus, this paper presents the architecture used in a photovoltaic system with power optimizer and a performance simulation for application in a residence and a photovoltaic plant. Thus, it is possible to measure the gain provided by power optimizer in simulated systems. As a result, the application of the photovoltaic system in residence provided better performance than the application in the photovoltaic plant, due to the greater frequency of shading in the photovoltaic modules. Therefore, power optimizer for photovoltaic systems is a solution that can be considered, mainly with the reduction of the cost of power electronics in the future.
关键词： power optimizer for photovoltaic systems,architecture,photovoltaic,Renewable energy,Modular Architecture
更新于2025-09-16 10:30:52