- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Technical analysis of photovoltaic energy generation for supplying the electricity demand in Brazilian dairy farms
摘要： In many Brazilian dairy farms, the supply of electrical energy does not fully meet the demands of the production systems and/or presents frequent fluctuations and interruptions, making the expansion of production chain unfeasible. These and other barriers have motivating the adoption of renewable and independent energy sources, installed directly in the farms. The present study was conducted to perform a technical analysis of photovoltaic energy generation required for supplying the electricity demand in dairy farms located at Minas Gerais State, Brazil. Daily global radiations on tilted panels were estimated by mathematical models and long-term meteorological database (greater than 33 years). Electrical energy generated by grid-connected photovoltaic systems was predicted considering minimum, average, and maximum daily global radiation conditions. Electrical energy demands were monitored in small (66 cows), medium (106 cows), and large (158 cows) dairy farms. The direct use of electrical energy in operations performed at Brazilian dairy farms were 4, 28, 15, 39, and 15%, on average, for lighting, milking, water heating/pumping, milk cooling/refrigeration, and miscellaneous, respectively. The estimated energy consumptions were 0.96, 0.87, and 0.81 kWh cow?1 day?1 for farms with 66, 106, and 158 cows, respectively. The photovoltaic panel area varied considerably among small, medium, and large dairy farms in order to meet 80% of renewable fraction for the electricity demand.
关键词： Solar radiation models,Photovoltaic panels,Grid-connected photovoltaic system,Energy consumption,Renewable energy,Farm building
更新于2025-09-16 10:30:52
-
[IEEE 2019 3rd International Conference on Computing Methodologies and Communication (ICCMC) - Erode, India (2019.3.27-2019.3.29)] 2019 3rd International Conference on Computing Methodologies and Communication (ICCMC) - The application of DC borewell with High Step-Up DC-DC Converter By Using Photovoltaic System
摘要： In this paper, the application of DC borewell with high step-up DC-DC converter used to produce high voltage gain along with coupled inductor and switched capacitor technique. This topology consist of switched voltage multiplier capacitor and coupled inductor. The switched capacitor get charged in switch off period by using energy accumulated in coupled inductor which increase the losses are voltage gain. Therefore, the conduction minimized with the RDS low resistance and main power switch circuit. The simulation model of “The application of DC borewell with high Step-up DC-DC Converter is based on switched Using Photovoltaic System” capacitor and coupled inductor techniques. MATLAB software is used to give input of 17v from the PV panel and expectedly got output voltage of load 500 v and power of 200W. Finally, checked its working with basic circuit of 20v I/P and 530V O/P.
关键词： coupled inductor,photovoltaic system,switched capacitor,DC borewell motor,converter
更新于2025-09-16 10:30:52
-
LLC Resonant Voltage Multiplier-Based Differential Power Processing Converter Using Voltage Divider with Reduced Voltage Stress for Series-Connected Photovoltaic Panels under Partial Shading
摘要： Partial shading on photovoltaic (PV) strings consisting of multiple panels connected in series is known to trigger severe issues, such as reduced energy yield and the occurrence of multiple power point maxima. Various kinds of differential power processing (DPP) converters have been proposed and developed to prevent partial shading issues. Voltage stresses of switches and capacitors in conventional DPP converters, however, are prone to soar with the number of panels connected in series, likely resulting in impaired converter performance and increased circuit volume. This paper proposes a DPP converter using an LLC resonant voltage multiplier (VM) with a voltage divider (VD) to reduce voltage stresses of switches and capacitors. The VD can be arbitrarily extended by adding switches and capacitors, and the voltage stresses can be further reduced by extending the VD. Experimental verification tests for four PV panels connected in series were performed emulating partial shading conditions in a laboratory and outdoor. The results demonstrated the proposed DPP converter successfully precluded the negative impacts of partial shading with mitigating the voltage stress issues.
关键词： LLC converter,differential power processing converter,voltage multiplier,voltage divider,photovoltaic system,partial shading
更新于2025-09-16 10:30:52
-
[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Estimate of Performance Ratio and Generated Energy of Grid-Connected Photovoltaic Systems in Paraná
摘要： Recently, energy has been highlighting in global and Brazilian scenarios. This study aims to estimate the performance ratio of grid-connected photovoltaic systems in the Paraná state, in Brazil, for four different photovoltaic technologies, and the annual energy generated. The knowledge of this rate is relevant to determine the performance of these systems. In low temperatures, the polycrystalline silicon systems reached higher performance rates, while in high temperatures, the cadmium telluride systems presented better performance. Concluding, the performance ratio varies in different ways for the photovoltaic technologies studied, according to the temperature. The produced energy in Curitiba was higher in comparison with the other cities, the final amount influences the distribution grid and there is a need of further studies to analyze in deep its impact and adequacy with the smart grids.
关键词： smart grid,photovoltaic system,Paraná,performance ratio
更新于2025-09-16 10:30:52
-
Energy assessment and economic sensitivity analysis of a grid-connected photovoltaic system
摘要： This paper presents techno-economic assessment results of a grid-connected photovoltaic (PV) system for domestic building application. The PV system electricity output, energy conversion ef?ciency and cell temperature are explored based on the local weather condition, the system life cycle cost is evaluated with full account of the life of assets, volatile economic ?uctuations, uncertainty in?uence factors, net present value (NPV) and discounted payback period (DPP) under Feed-in Tariff (FiT) scheme, the annual savings and payback time are compared for the FiT and new Smart Export Guarantee (SEG) schemes. Technical analysis results indicate that the system is capable of ful?lling the building electrical energy demand from April to October, and the extra electricity of 1530.23 kWh is exported to the grid in this period. The life cycle cost assessment results illustrate that the system achieves a NPV of ￡1335.32 and has a DPP of 9.34 years under the FiT scheme. Moreover, the sensitive analyses reveal that the high discount rate decreases the system NPV whereas the high initial cost leads to long payback period to realize the positive NPV. Furthermore, the FiT is the most cost-effective solution for PV system and has the shortest DPP compared with the SEG.
关键词： Techno-economic assessment,Photovoltaic system,Feed-in tariff,Smart export guarantee,Economic sensitivity analysis
更新于2025-09-16 10:30:52
-
Design of Soft Switching Interleaved Boost Converter for Photovoltaic Application
摘要： The objective of our study is to reduce the size of passive components and reduction of ripple in output voltage and input current by using interleaved soft switching dc-dc converter (interleaving action). The PV system converts solar energy into electrical energy but its output varies with variation of solar radiation and temperature. To provide impedance matching between PV and load a dc-dc converter with MPPT technique is used in PV (Photo Voltaic) Systems. This study incorporates design of the interleaved soft switching dc-dc converter for PV System by using P&O (Perturb and Observe) fuzzy logic controller. The P&O Fuzzy MPPT provides an accurate and fast converging under varying illumination and load conditions compared to conventional MPPT methods. The performance of the system is first analyzed by simulation using Matlab/Simulink software. The results of simulation were compared and analyzed.
关键词： photovoltaic system,perturb and observe,Maximum Power Point Tracking (MPPT),Fuzzy Logic Controller (FLC)
更新于2025-09-16 10:30:52
-
The study of photovoltaic systems performance using various azimuth angles and solar array tilt positions
摘要： The study of photovoltaic energy and load predictions have become essential with the increase of energy demand. The objective of this paper is to present an analytical study on the performance of photovoltaic system with various azimuth angles and solar array tilt positions. The output power of a solar module is mainly dependent on its tilt position, solar irradiation, type of solar cell, and the technical properties of the module. The data used in this work consist of two different locations. The outcome of this work shows that the energy production influenced heavily on the weather conditions, location, azimuth angles and tilt positions. Within this work, parameters such as planes-of-array irradiance, net to inverter output power, net to grid output power and performance ratio have been studied. The developed analytical study is anticipated to provide a better understanding on the energy production and load usage in accordance with suitable tilt angle of solar array in a specific location.
关键词： energy efficiency,azimuth angle,Photovoltaic system,solar panels tilt positions
更新于2025-09-16 10:30:52
-
Disturbance Characteristics of the Off-Grid Photovoltaic System in the Frequency Range from 9 - 150 kHz with Changing Solar Irradiance and Shading Area
摘要： A solar power plant converts light into electricity using photovoltaics. It uses an inverter to convert DC to AC current to be connected to an AC load. Increasing use of solar panels in household application results in an increase in the use of inverters, in which some might due to the fact that inverters can produce disturbances at a frequency between 9-150 kHz. This study is focused on observing the disturbance characteristics of an off-grid photovoltaic system due to variations of irradiation and shading in the frequency range from 9 - 150 kHz. It is expected that the output of this observation can provide a reference for research in determining the effects on electric power system. This observation provided a shading effect of 0%, 25%, 50%, 75%, and 100% of the photovoltaic area and then conducted observation based on two solar irradiation conditions. Based on the observations, it is identified that in general there are 3 frequency ranges of dominant disturbances, they are: 20-25 kHz, 72-73 kHz, and 144-146 kHz. Their voltage disturbance will decrease with increasing shading area, where at shading conditions of 25% and 50% they will have a value voltage disturbance that tends to be the same as that in the 3 dominant frequency ranges.
关键词： disturbance characteristics,off-grid,shading area,photovoltaic system,solar irradiance
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Power generation and performance analysis of Bi-facial vs Mono-facial 10KW Photovoltaic power station
摘要： This paper is based and written on performance analysis of a 10kW Grid connected solar power system with a comparison integration of bifacial photovoltaic systems vs mono-facial photovoltaic system. Thus, all these tastings were carried out on computer simulations using PVSyst6 software & MATLAB/Simulink. These simulations were done considering different albedos and tilt angles in order to identify power variations under different environmental conditions. The selected panels used mono-crystalline type-high efficiency cells, both in bifacial and mono-facial, and therefore, the technical parameters of both cell types will be the same in operating conditions. With the results obtained, it has shown the power gain in ground mounted-grid connected bifacial solar system is 23% more than mono-facial solar power system, and using these details, author proposed a table that represents, most suitable PV panels for different site conditions.
关键词： mono-facial,Mono-crystalline,bifacial,Photovoltaic system,power
更新于2025-09-16 10:30:52
-
[IEEE 2019 8th International Conference on Systems and Control (ICSC) - Marrakesh, Morocco (2019.10.23-2019.10.25)] 2019 8th International Conference on Systems and Control (ICSC) - Performance Evaluation of Neural Network Controlled Grid-Connected Photovoltaic System for Power Quality Enhancement
摘要： This paper studies a neural network (NN) control for three-phase grid-connected Photovoltaic (PV) system. This study aims to improve the performances of the system, ensure a high quality of the Total Harmonic Distorsion and extract the maximum power while ensuring unity power factor. A neural network controller is used instead of the two PI regulation loop for grid currents. The Levenberg Marquardt (LM) algorithm is used to train the NN controller and the validation and training data of the utilized neural controller are obtained by simulation of the entire system with the PI controllers calculated for variation of solar irradiance. The simulation study shows that the neural controller indicates significantly more enhanced performance than that of the PI controller, including faster response times, lower overshoot and Total Harmonic Distortion (THD).
关键词： Neural Network Control,Levenberg Marquardt Algorithm,Photovoltaic System,Total Harmonic Distortion,Power Quality
更新于2025-09-16 10:30:52