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[IEEE 2019 16th International Multi-Conference on Systems, Signals & Devices (SSD) - Istanbul, Turkey (2019.3.21-2019.3.24)] 2019 16th International Multi-Conference on Systems, Signals & Devices (SSD) - Photovoltaic power forecasting through temperature and solar radiation estimation
摘要： The Utilization of the photovoltaic power as a source of electricity has been strongly growing. The unpredictability of the PV power energy induces frequency fluctuations and power system instabilities. Thus, short term PV power prediction, from one hour to several hours, becomes very important to ensure grid stability. The photovoltaic power depends on different weather conditions mostly temperature and solar radiation. Therefore, weather data forecasting becomes highly recommended. This paper presents a comparison study between the adaptive neuro-fuzzy inference system and the feed forward neural network for one hour ahead temperature and solar radiation estimation using different input data. Two and four hours ahead forecasting of the metrological data are done using the feed forward neural network model. Using the forecasted weather data, the photovoltaic power is deduced. The accuracy of the topologies is based on the normalized root mean square error (NRMSE), and the mean absolute percentage error (MAPE) The simulation results show that the FFNN outperforms the ANFIS model.
关键词： photovoltaic power,FFNN,ANFIS,prediction,solar radiation,temperature
更新于2025-09-11 14:15:04
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[IEEE 2019 International Conference on Electromechanical and Energy Systems (SIELMEN) - Craiova, Romania (2019.10.9-2019.10.11)] 2019 International Conference on Electromechanical and Energy Systems (SIELMEN) - Analysis of the Aspects of Increasing the Efficiency of Electricity Generation by Photovoltaic Power Plants
摘要： The increase in the share of energy produced from renewable sources in the energy balance presents itself as a strategic problem for world energy sector. The use of solar energy to produce electricity is possible everywhere. The purpose of this work is to analyze the factors that affect the efficiency of electricity production, as well as the development of theoretical aspects of increasing the efficiency of the operation of photovoltaic power plants. The research methodology is based on the complex analysis of the particularities of the conversion of solar radiation into electricity by photovoltaic cells, which are presented through ideal equivalent schemes and equivalent schemes that take into account the impact of temperature, the intensity of solar radiation and the partial shading factor of the photovoltaic cells. As a research tool it is proposed to perform the modeling of the characteristics of current- voltage and voltage - power of the solar panels and platforms with PV panels mounted. It presents the methodological aspects of the analysis of the energy production of the PV plants for different operating conditions, the results of the analysis of the electricity production of the PV plants in the world and the estimation of the influence of the main factors (temperature, the intensity of the solar radiation, the degree of shading) on the deviation of the characteristics of the photovoltaic cells. It has been proposed the concept and the general theoretical aspects regarding the elaboration of the mathematical model of the PV power station, which takes into account the influencing factors on the efficiency of electricity production. It has been shown that in the mathematical model the influence of the sun's motion on the celestial vault can be modeled by varying the intensity of the solar radiation depending on the positioning of the sun.
关键词： characteristics of temperature,share of production,power,influence factors,intensity of solar radiation,electricity,current and voltage
更新于2025-09-11 14:15:04
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Solar light distribution inside a greenhouse with the roof area entirely covered with photovoltaic panels
摘要： Most photovoltaic (PV) greenhouses in Europe have maximised the energy production without considering the requirements of the crops, by applying PV panels on most part of the roof area. The aim of this work is to calculate the solar light distribution in a photovoltaic (PV) greenhouse where the entire roof area is covered with PV panels (100% cover ratio). The calculation of the incident global was estimated with clear sky conditions on several observation points located inside the greenhouse at 1.5 m from the ground level. The validation of the simulated data was conducted through measurements inside a PV greenhouse complex located in Florinas, Italy (40°38’38”N; 8°39’31”E), composed by 24 single-span greenhouse modules of 837 m2 each and total area of 2.2 ha. The roof area of each module was completely covered with a monocrystalline PV array with slope of 20° and a rated power of 22 kWp. The results were shown through a map of light distribution on the greenhouse area, which highlighted the most penalised zones and the percentage of available global radiation, compared to the same greenhouse without PV array. Good agreement was shown by the simulated data, compared to measurements (mean R2=0.78). The global radiation on the greenhouse area was 33% on yearly basis, compared to the potential value with no PV panels on the roof. The zones close to the gable walls and the south side wall suffered less shading compared to the central portion of the greenhouse area. The map of cumulated light distribution can support the growers to increase the agronomic sustainability of the PV greenhouse, since it will allow in perspective the identification of species and crop management practices for a profitable cultivation.
关键词： agricultural sustainability,PV greenhouse,crop,model,solar radiation,energy
更新于2025-09-11 14:15:04
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Energy and exergy analysis of solar heat driven chiller under wide system boundary conditions
摘要： In the paper, a solar driven ammonia-water chiller is investigated, as one of the systems having potential for reduction of resources depletion. An energy and exergy analysis is proposed for correct diagnostics while designing and operating the cycle. The boundary conditions for the analyses are set in accordance with Professor Szargut’s primary instructions. They are however widened to solar collector component. Solar radiation is treated as the driving energy or exergy, respectively. The analyses are supplemented with a sensitivity diagnosis revealing the most significant parameters modifying the efficiency and irreversibilities distribution. According to the findings, design COP of the chiller equals 0.444 while its net exergy efficiency is 0.026. Solar collector component is the most burdened with exergy destruction and loss in the whole cycle.
关键词： Exergy analysis,irreversibility,solar radiation exergy,solar thermal collector,ammonia-water chiller
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - The Use of Satellite Data in the Copernicus Atmosphere Monitoring Service (Cams)
摘要： The Copernicus Atmosphere Monitoring Service (CAMS) is one of the six thematic services of the European Union's flagship Earth Observation programme Copernicus. CAMS is implemented by the European Centre for Medium-Range Weather Forecasts (ECMWF) together with a network of about 60 entities distributed in 20 European countries: it is thus a truly international and collaborative effort. CAMS delivers operationally a wide range of information products and services on air quality, emissions and surface fluxes, solar radiation and climate forcings. All CAMS atmospheric composition outputs are unrestricted and provided free-of-charge to users worldwide. The CAMS global forecasting system is using ECMWF's Integrated Forecasting System (IFS), which is used successfully for Numerical Weather Prediction and has been extended with modules for atmospheric chemistry, aerosols and greenhouse gases. Over 60 different satellite data streams are assimilated to provide twice daily global atmosphere composition forecasts.
关键词： emissions,atmospheric composition,Copernicus,solar radiation,air quality
更新于2025-09-10 09:29:36
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A Long-Term Historical Aerosol Optical Depth Data Record (1982-2011) Over China From AVHRR
摘要： A long-term historical aerosol optical depth (AOD) data (15–45° N; 75–135° E) with 0.1 spatial resolution has been produced from Advanced Very High Resolution Radiometer (AVHRR) Pathfinder Atmospheres—Extended level-2B data. The spatial distribution pattern shows that high AOD values are found in central and eastern China over the entire period with AODs larger in summer and spring than in autumn and winter. As the high-quality products from AERONET were absent for this period over mainland China, AOD data obtained using the broadband extinction method from solar radiation stations have been used to verify the quality of the AVHRR AOD data set over China. The intercomparison results show that the interannual variation of AOD has been well captured in the variation curve of the AOD monthly mean and the variation trend is also consistent over the whole period. The correlation coefficient of the monthly mean is mostly larger than 0.55, the agreement index is larger than 0.57, and the relative error is less than 21%. Both AVHRR and visibility data sets show high values in regions with rapid economic development. Using Moderate Resolution Imaging Spectroradiometer AOD data as references, it is found that AVHRR AOD from this paper has better accuracy in general than that from Deep Blue (DB) algorithm over China, especially over eastern and southern China, while DB provides more coverage especially over bright surface such as northwest China. This long-term historic AOD data set can be used together with other AOD data sets to study the climate and environmental changes, especially in the 1980s and 1990s.
关键词： Aerosol optical depth (AOD),Advanced Very High Resolution Radiometer (AVHRR),solar radiation,multiple regression method,Moderate Resolution Imaging Spectroradiometer (MODIS)
更新于2025-09-10 09:29:36
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Measurement of Global Solar Radiation data using Raspberry Pi and its estimation using Genetic Algorithm
摘要： The demand for more efficient and environmentally benign, non-conventional sources of energy came into picture due to increasing demands for human comforts. Solar energy is now the ultimate option. In this paper, the instruments used to measure the solar radiation at Innovation Centre, MIT Manipal were connected to a Raspberry Pi to access the data remotely. Genetic Algorithms were formulated, so that the monthly mean global solar radiation in Manipal can be effectively estimated. Meteorological data such as humidity, temperature, wind speed, etc. were used as inputs to train the networks. A successful network was made between the data loggers and the Raspberry Pi. The data collected by the data loggers from the devices are transmitted to the Raspberry Pi which in turn sends the data to an internal server. The Raspberry Pi can be accessed using any SSH client such as PuTTY. The meteorological data was collected for the years 2010-2014 in order to formulate the Artificial Intelligence models. The validity of the formulated models were checked by comparing the measured data with the estimated data using tools such as RMSE, correlation coefficient, etc. The modelling of solar radiation using GA was carried out in GeneXpro tools version 5.0.
关键词： Raspberry Pi,Genetic Algorithm,GeneXpro tools,Solar radiation,Meteorological data
更新于2025-09-10 09:29:36
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Calibration of the Pyranometer Sensitivity Using the Integrating Sphere
摘要： The pyranometer for observing the solar radiation reaching the surface of the earth is manufactured by various companies around the world. The sensitivity of the pyranometer at the observatory is required to be properly controlled based on the reference value of the World Radiometric Center (WRC) and the observatory environment; otherwise, the observational data may be subject to a large error. Since the sensitivity of the pyranometer can be calibrated in an indoor or outdoor calibration, this study used a CSTM-USS-4000C Integrating Sphere by Labsphere Inc. (USA) to calibrate the sensitivity of CMP22 pyranometer by Kipp&Zonen Inc. (Netherlands). Consequently, the factory sensitivity of CMP22 was corrected from 8.68 μV·(Wm?2)?1 to 8.98 μV·(Wm?2)?1, and the result from the outdoor calibration according to the observatory environment was 8.90 μV·(Wm?2)?1. After the indoor calibration of the pyranometer sensitivity, the root mean square error (RMSE) of the observational data at the observatory on a clear day without clouds (July 13, 2017) was 7.11 Wm?2 in comparison to the reference pyranometer. After the outdoor calibration of the pyranometer sensitivity based on these results, the RMSE of the observational data was 1.74 Wm?2 on the same day. Periodic inspections are required because the decrease of sensitivity over time is inevitable in the pyranometer data produced at the observatory. The initial sensitivity after indoor calibration (8.98 μV·(Wm?2)?1) is important, and the sensitivity after outdoor calibration (8.90 μV·(Wm?2)?1) can be compared to the data at the Baseline Surface Radiation Network (BSRN) or can be used for various studies and daily applications.
关键词： Sensitivity,Pyranometer,Solar radiation,Indoor?outdoor calibration,Integrating sphere
更新于2025-09-10 09:29:36
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - New reference solarimetric network for Mexico
摘要： The new reference solarimetric network for Mexico is presented, actually 10 stations has been installed around the country with a climatic regionalization, the three principal solar parameters are measured (bean, diffuse and global radiation) in all the stations, and spectral parameters in some stations (long wave radiation, UVB and illuminance)
关键词： solarimetric network,Mexico,climatic regionalization,solar radiation
更新于2025-09-10 09:29:36
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Analysis of Linke turbidity index from solar measurements in Mexico
摘要： The atmospheric Linke Turbidity index is determined from solar radiation measurements of global irradiance for different weather stations of México. The Linke turbidity index is obtained from ESRA clear sky model by adjusting the index value that gives the smallest difference between the model and the measured irradiances. Clear days were identified in the solar database of selected stations and the monthly mean value for the turbidity is compared with Linke values worldwide provided from Meteotest through their internet services. Significant differences are found in some cases; but in most cases, the measured variability shows agreement with the Meteotest values.
关键词： Linke Turbidity index,Meteotest,ESRA clear sky model,solar radiation
更新于2025-09-10 09:29:36