- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Forecasting the Performance of a Photovoltaic Solar System Installed in other Locations using Artificial Neural Networks
摘要： Photovoltaic solar energy has been spread all over the world, and in Brazil this energy source has been getting considerable space in the last years, being driven mainly by the energy crises. However, when installed in regions with low incidence of solar irradiation, this technology presents a loss of efficiency in the generation of energy. As an alternative to this consideration, a power prediction study could be conducted prior to its installation, based on local climate information that directly influences power generation, verifying the feasibility of system implementation and avoiding unrewarded investment. Therefore, the objective of this work is to predict the viability of the installation of a photovoltaic system of 3kWp in different places, with the assist of an Artificial Neural Network. Thus, the feedforward network was used for the training, being trained and validated with the support of MatlabVR , and inserting samples of temperature and solar irradiation as input variables. Through the performance methods, the results are favorable for this application, presenting validations with RMSE% in the range of 13-20% and R of not less than 0.93. The predictions presented RMSE% around 19-25% and average powers close to the real values generated by the PV system.
关键词： solar irradiation,renewable energy,electrical systems,energy efficiency,power forecasting,feedforward,artificial neural network,root mean square error,solar photovoltaic system,distributed generation
更新于2025-09-19 17:13:59
-
An assessment study of evaporation rate models on a water basin with floating photovoltaic plants
摘要： Under the general topic of the impact of floating photovoltaics (FPVs) systems on water basins, the present study aims to model and analyze the effect of FPVs on the evaporation rate of water surfaces. The estimation of the evaporation of the water surface of a basin is usually calculated using mathematical evaporation models that require knowledge of some parameters (ie, solar radiation, humidity, air temperature, water temperature, and wind velocity). Thus, in the first section of this study, some evaporative models (EVM) for free water basin have been examined to evaluate which are the environmental variables used. On the basis of this analysis, new numerical models for the calculation of the daily evaporation rate have been developed using the design of experiments (DoE) method (three models) and the linear regression method (two models). The results of the developed models have been compared with the experimental measurements carried out by an evaporimeter; such comparison has highlighted the robustness of the proposed numerical models. Moreover, for estimating the evaporation rate in water basins partially covered by FPVs, further three numerical methods are proposed. Finally, the evaporation rates, arising by the installation of different typology of FPVs on water basins, have been evaluated as function of the energy balance on the water surface. It is possible to highlight that the amount of evaporated water depends not only on the percentage of surface covered but also on the characteristics of floating systems. Covering only 30% of the surface of a basin, it is possible to obtain up to 49% reduction in evaporation.
关键词： evaporation rate,linear regression,energy system,DoE methods,renewable energy,floating photovoltaics
更新于2025-09-19 17:13:59
-
[IEEE 2019 6th International Conference on Advanced Control Circuits and Systems (ACCS) & 2019 5th International Conference on New Paradigms in Electronics & information Technology (PEIT) - Hurgada, Egypt (2019.11.17-2019.11.20)] 2019 6th International Conference on Advanced Control Circuits and Systems (ACCS) & 2019 5th International Conference on New Paradigms in Electronics & information Technology (PEIT) - Photovoltaic-Based Interconnected-Modified DC-Nanogrids within an Open Energy Distribution System
摘要： A DC nano-grid is typically intended as a reliable scheme capable of delivering power to the local loads from distributed renewable energy resources. The conventional nano-grid uses two-separate conversion stages for feeding both ac and dc loads. But, the modified design for the dc nano-grid uses only a single-stage converter. It is based on a single-input power-electronic multi-output converter that interfaces the source with the average load requirements. It deals with a switched boost inverter (SBI) that can fed from a solar photovoltaic (PV) renewable energy source. SBI is a single-stage power converter capable of simultaneously supplying both dc and a higher or lower ac loads from a single dc input voltage source. The converter operation is also contributed by a simple model reference adaptive closed loop control technique, to fed the high output ratings steadily, especially in the critical range for its duty ratio. In addition, this paper presents a full model design for multiple interconnected nanogrids through a dc-link within a multilevel direct current (dc) scheme called an open energy distributed system (OEDS). Each nanogrid involves a switched boost inverter (SBI) providing its closed-loop control method for its dc-link voltage. Moreover, this paper involves a controller method to attain the optimum suggested power interconnected nanogrids. The proposed systems are modelled and simulated with the help of MATLAB/Simulink software package to assess the robustness of the proposed OEDS with multiple 5-Kw interconnected nanogrids fed from photovoltaic (PV) renewable energy resources.
关键词： Switched Boost Inverter (SBI),Modified - DC nanogrids,Distributed Renewable Energy Source (DRES),Open Energy Distribution System (OEDS)
更新于2025-09-19 17:13:59
-
Microgeneration of Electricity Using a Solar Photovoltaic System in Ireland
摘要： Microgeneration of electricity using solar photovoltaic (PV) systems is a sustainable form of renewable energy, however uptake in Ireland remains very low. The aim of this study is to assess the potential of the community-based roof top solar PV microgeneration system to supply electricity to the grid, and to explore a crowd funding mechanism for community ownership of microgeneration projects. A modelled microgeneration project was developed: the electricity load pro?les of 68 residential units were estimated; a community-based roof top solar PV system was designed; an electricity network model, based on a real network supplying a town and its surrounding areas, was created; and power ?ow analysis on the electrical network for system peak and minimum loads was carried out. The embodied energy, energy payback time, GHG payback time, carbon credits and ?nancial cost relating to the proposed solar PV system were calculated. Di?erent crowdfunding models were assessed. Results show the deployment of community solar PV system projects have significant potential to reduce the peak demand, smooth the load pro?le, assist in the voltage regulation and reduce electrical losses and deliver cost savings to distribution system operator and the consumer.
关键词： photovoltaic,solar energy,renewable energy,crowd funding,microgeneration
更新于2025-09-19 17:13:59
-
[IEEE 2019 4th International Conference on Mechanical, Control and Computer Engineering (ICMCCE) - Hohhot, China (2019.10.24-2019.10.26)] 2019 4th International Conference on Mechanical, Control and Computer Engineering (ICMCCE) - Video Based Fire Detection in Photovoltaic System
摘要： This paper presents a novel energy-management method for a microgrid that includes renewable energy, diesel generators, battery storage, and various loads. We assume that the microgrid takes part in a pool market and responds actively to the electricity price to maximize its profit by scheduling its controllable resources. To address various uncertainties, a risk-constrained scenario-based stochastic programming framework is proposed using the conditional value at risk method. The designed model is solved by two levels of stochastic optimization methods. One level of optimization is to submit optimal hourly bids to the day-ahead market under the forecast data. The other level of optimization is to determine the optimal scheduling using the scenario-based stochastic data of the uncertain resources. The proposed energy management system is not only beneficial for the microgrid and customers, but also applies the microgrid aggregator and virtual power plant. The results are shown to prove the validity of the proposed framework.
关键词： energy management,Controllable load,stochastic optimization,microgrid,risk management,smart grid,renewable energy,electricity market
更新于2025-09-19 17:13:59
-
Exergy and economic analyses of a novel hybrid structure for simultaneous production of liquid hydrogen and carbon dioxide using photovoltaic and electrolyzer systems
摘要： Power-to-X technology that converts renewable electricity to chemicals and liquid fuels will be a key component of the energy turnaround. However, for a successful transition toward fossil-free energy alternatives, serious issues associated with renewable energy storage have to be addressed. Here, we report an innovative power-to-liquid hydrogen and carbon dioxide plant. The proposed integrated plant is composed of five subsystems: power generation using grid-connected solar photovoltaic (PV) subsystem, hydrogen and oxygen gas production using an electrolyzer, oxyfuel power plant for power and heat generation, carbon dioxide liquefaction using an absorption–compression refrigeration subsystem, and a hydrogen liquefaction subsystem. This hybrid structure produces 3.359 (cid:1)(cid:2)/(cid:4) (~300 ton/day) liquid hydrogen and 10.04 (cid:1)(cid:2)/(cid:4) liquid carbon dioxide. The total exergy efficiency and specific energy consumption of the hydrogen liquefaction system are 94.87% and 3.368 (cid:1)(cid:6)?/(cid:1)(cid:2)(cid:8)(cid:9)(cid:10), respectively. Exergy analysis of this integrated structure shows that the largest contribution of exergy destruction (30.58%) is associated with the photovoltaic system and the lowest exergy efficiency (25.28%) belongs to the Turbine in an oxy-fuel subsystem where it, interestingly produces over 70% of the total energy consumption of the plant. Furthermore, the economic analysis of the plant indicates that the time required for the return of capital is 4.794 years, where the prime price of the product and the value added are 0.1921 (cid:11)(cid:12)$/(cid:1)(cid:2)(cid:8)(cid:9)(cid:10) and 0.5433 (cid:11)(cid:12)$/(cid:1)(cid:2)(cid:8)(cid:9)(cid:10), respectively. This work can certainly provide a new approach to producing liquid hydrogen and carbon dioxide for long-distance transportation and CO2 reduction using solar as the renewable energy source.
关键词： Oxyfuel power plant,Renewable energy,Photovoltaic,Electrolyzer,Thermo-Economic,Liquid hydrogen,Absorption–compression refrigeration
更新于2025-09-19 17:13:59
-
Can a city reach energy self-sufficiency by means of rooftop photovoltaics? Case study from Poland
摘要： The process of decarbonising economies has to take place on a multiple levels. One of the objectives is to ensure renewables-based energy self-sufficiency of cities. Cities have become home to the majority of the world’s population, and at the same time contribute enormously to environmental pollution. Considering the above, the purposes of this paper are threefold: to formulate a methodology for estimating rooftop photovoltaics (PV) potential in urban areas based on detailed Light Detection And Ranging (LiDAR) data; to calculate the spatial variability of load and photovoltaics energy supply, and thus to distinguish zones with various levels of energy self-sufficiency; and finally, to scrutinise the economic and environmental aspects of such a solution in given conditions. Wroc?aw, the capital city of the Lower Silesia voivodeship (NUTS 2 administrative division) in south-west Poland (Central Europe), was selected as a case study. The city has a population of close to 650,000 and an annual electricity consumption slightly exceeding 2.2 TWh. Industry constitutes 46% of that demand, and households 31%. The results show that up to 850 MW of rooftop PV can be installed in the city, which has the potential to reduce the electrical energy related emissions by almost 30% and simultaneously to increase the city’s energy self-sufficiency. Although energy storage, in the form of batteries, slightly improves both the autarky and environmental indices, the relation between potential PV generation and load makes them very infrequently useful (mostly in summer) and not economically justified.
关键词： renewable energy,power system transition,LiDAR,GIS,self-sufficiency
更新于2025-09-19 17:13:59
-
Potential of floating photovoltaic plant in a tropical reservoir in Brazil
摘要： The increasing global demand for electricity has led to a significant increase in the search for low-impact alternative sources, with solar photovoltaic being identified as one of the most feasible options. However, photovoltaic power plants require large ground areas, which represent a major constraint. If the panels are installed on water bodies, this restriction may be avoided. In this work, a simulation was performed to assess the potential of floating photovoltaic power generation in the tropical Gavi~ao reservoir, located in the Northeast of Brazil. A payback analysis indicated that the investment in construction of the system is fully recovered in eight years, and that water losses due to evaporation can be reduced by approximately 2.6 (cid:3) 106 m3/year, sufficient to supply roughly 50,000 people.
关键词： surface reservoir,floating photovoltaic plant,renewable energy
更新于2025-09-19 17:13:59
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Quantum Temporal Imaging with Finite Time Aperture
摘要： Balancing electricity supply and demand is a complex task. Renewable energy sources are often intermittent, while electrical loads vary throughout the day. This can result in an abundant supply that suppresses spot prices in one region, while another region simultaneously experiences tight supply margins and price spikes. Connecting these two regions through electrical interconnectors would enable greater utilization of renewable energy, but this can be expensive and is unfeasible for distant regions, such as between continents. However, datacenters are becoming ubiquitous around the world and are linked through fiber connections. This paper proposes a virtual interconnector (VIC) scheme using fiber to dynamically move energy demand, in the form of computation, to datacenters in other market regions with surplus low cost and renewable energy. This increases the global renewable penetration without requiring expensive grid interconnections. The associated benefits for the datacenter operator, the electricity grid controller, consumers, and the environment are discussed.
关键词： power system economics,load management,optical interconnections,power system control,Data warehouses,renewable energy sources,green computing,power system interconnection
更新于2025-09-19 17:13:59
-
Performance of photovoltaic canarian greenhouse: A comparison study between summer and winter seasons
摘要： A large-scale use of the renewable energy in agriculture has become an optimal way to successfully deal with the issues of sustainability and climate change. Recently, the integration of solar panels on the roof of the greenhouse gave birth to a new crop production system called photovoltaic greenhouse. In this paper, we investigated the shading effect of the flexible photovoltaic panels, mounted on the greenhouse roof area in the checkerboard format, on the microclimate and the tomatoes yield during the summer and winter period. This study was undertaken in a two tomato canarian greenhouses, typical of the south Mediterranean region. The results of our study showed that the photovoltaic panels covering 40% roof area of the canary type greenhouse does not have a significant effect on the climatic parameters. Additionally, during the hot period, the photovoltaic panels reduced the temperature inside the greenhouse and sometimes falling in the optimum range for the tomatoes growth. Furthermore, this occupancy rate of the photovoltaic panels does not have a significant effect on the overall yield of tomatoes.
关键词： Shading,Flexible photovoltaic panels,South Mediterranean area,Tomatoes,Renewable energy,Microclimate
更新于2025-09-19 17:13:59