scholarly journals Autonomous control of biaxial tracking photovoltaic system

2016 ◽  
Vol 61 (Special Issue) ◽  
pp. S48-S52
Author(s):  
M. Olejár ◽  
V. Cviklovič ◽  
D. Hrubý ◽  
O. Lukáč
Keyword(s):  
Autonomous Navigation ◽  
Control Method ◽  
Theoretical Calculations ◽  
Photovoltaic Cells ◽  
Energy Gain ◽  
Photovoltaic System ◽  
Photovoltaic Systems ◽  
The Sun ◽  
Direction Control ◽  
Specific Position

Tracking photovoltaic systems maximize solar energy on the photovoltaic cells surface in order to maximize the energy gain at a given moment. Energy gain is dependent on the accuracy of photovoltaic cells direction, control method and tracking period. The control of tracking systems is based on theoretical calculations of sun position for a specific position in specific time. Designed control algorithm of the biaxial tracking photovoltaic system is able of autonomous navigation directed to the sun without knowing the position. It is based on the sun position sensor. The designed solution increases the solar gain by 33.8% in comparison with stable photovoltaic systems. It is usable in the research focused on the control method of step-controlled biaxial tracking photovoltaic devices.

Determination of Mars Solar-Belt by Modeling of Solar Radiation Using Artificial Neural Networks

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Tamer Khatib ◽  
Irjuwan Abunajeeb ◽  
Zainab Heneni
Keyword(s):  
Solar Radiation ◽  
Back Propagation ◽  
Photovoltaic System ◽  
Photovoltaic Systems ◽  
The Sun ◽  
Water Ice ◽  
Available Energy ◽  
Feed Forward Back Propagation ◽  
Solar Radiation Intensity ◽  
Artificial Neural

Missions to Mars need a power source, while, one of the most compatible sources for such a purpose is the photovoltaic system. Photovoltaic systems generate power based on the available energy from the Sun, and thus, solar radiation intensity at Mars should be known for design purposes. In this research, the feed-forward back-propagation artificial neural network is developed to predict solar radiation in terms of longitude, latitude, time of the day, temperature, altitude, pressure, amount of dust, and volume mixing ratio of water ice clouds. Data which are used to develop this model are obtained from the Mars Climate Database. The results of the developed method are accurate as compared with other methods whereas the correlation (R2) coefficient for the developed model is 0.97. The developed model then is used to predict mean solar radiation and mean temperature for every location on Mars and then the data are presented on Mars maps in order to determine the best location for harvesting energy from the Sun by photovoltaic systems. According to results, the solar radiation-temperature belt on Mars is found to be between latitudes 20 deg south and 15 deg north.

scholarly journals Factors of photovoltaic system cost affect in Ecuador

2019 ◽  
Vol 5 (6) ◽  
pp. 1-11
Author(s):  
Janner Leonel Santos Mantuano ◽  
Mario Javier Carreño Vera ◽  
Ever Nevárez Cedeño
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Electrical Energy ◽  
Photovoltaic System ◽  
Photovoltaic Systems ◽  
Angle Of Incidence ◽  
The Sun ◽  
The Hours ◽  
The Impact

A photovoltaic system is a set of devices that take advantage of the energy produced by the sun and convert it into electrical energy. The impact produced by the possibility of using solar energy in a controlled manner for different uses and purposes has allowed the development of complete systems of transformation, storage and distribution of the energy produced with photovoltaic systems as appropriate. The production of electricity from solar radiation using solar cells and photovoltaic panels is an application that has yet fully disseminated in Third World countries, such as Ecuador. The generation of electric power will depend on the hours that the sun shines and affects the solar panel, the type and quantity of modules installed, orientation, inclination, solar radiation that reaches them, quality of the installation and the power that can be delivered to the user. Ecuador is in a privileged location in terms of solar radiation, because the equatorial line that divides the planet into two hemispheres passes through it, being almost perpendicular to the radiation it receives. In addition, this does not change during the year and there a constant angle of incidence, characteristics that give photovoltaic solar energy a great potential for use. In the investigation, an analysis of how the prices of photovoltaic systems affect the Province of Manabí, the methodology used has been the bibliographic review to know as much as possible about what replenishes the costs of photovoltaic systems.

scholarly journals Bidirectional Power Sharing for DC Microgrid Enabled by Dual Active Bridge DC-DC Converter

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 404
Author(s):  
Sara J. Ríos ◽  
Daniel J. Pagano ◽  
Kevin E. Lucas
Keyword(s):  
Power Management ◽  
Distribution Systems ◽  
Control Method ◽  
Dynamic Performance ◽  
Management Control ◽  
Photovoltaic System ◽  
Dc Microgrid ◽  
Dual Active Bridge ◽  
Control Scheme ◽  
Bidirectional Power Flow

Currently, high-performance power conversion requirements are of increasing interest in microgrid applications. In fact, isolated bidirectional dc-dc converters are widely used in modern dc distribution systems. The dual active bridge (DAB) dc-dc converter is identified as one of the most promising converter topology for the mentioned applications, due to its benefits of high power density, electrical isolation, bidirectional power flow, zero-voltage switching, and symmetrical structure. This study presents a power management control scheme in order to ensure the power balance of a dc microgrid in stand-alone operation, where the renewable energy source (RES) and the battery energy storage (BES) unit are interfaced by DAB converters. The power management algorithm, as introduced in this work, selects the proper operation of the RES system and BES system, based on load/generation power and state-of-charge of the battery conditions. Moreover, a nonlinear robust control strategy is proposed when the DAB converters are in voltage-mode-control in order to enhance the dynamic performance and robustness of the common dc-bus voltage, in addition to overcoming the instability problems that are caused by constant power loads and the dynamic interactions of power electronic converters. The simulation platform is developed in MATLAB/Simulink, where a photovoltaic system and battery system are selected as the typical RES and BES, respectively. Assessments on the performance of the proposed control scheme are conducted. Comparisons with the other control method are also provided.

scholarly journals Modeling a Passive Cooling System for Photovoltaic Cells Under Concentration

2007 ◽  
Author(s):  
Allison Gray ◽  
Robert Boehm ◽  
Kenneth W. Stone
Keyword(s):  
Solar Irradiance ◽  
Waste Heat ◽  
Cooling System ◽  
Photovoltaic Cells ◽  
Theoretical Data ◽  
Photovoltaic System ◽  
Passive Cooling ◽  
Cell Temperature ◽  
Worst Case ◽  
Passive Cooling System

Cooling of photovoltaic cells under high intensity solar irradiance is a major concern when designing concentrating photovoltaic systems. The cell temperature will increase if the waste heat is not removed and the cell voltage/power will decrease with increasing cell temperature. This paper presents an analysis of the passive cooling system on the Amonix high concentration photovoltaic system (HCPV). The concentrator geometry is described. A model of the HCPV passive cooling system was made using Gambit. Assumptions are discussed that were made to create the numerical model based on the actual system, the methods for drawing the model is discussed, and images of the model are shown. Fluent was used to compute the numerical results. In addition to the theoretical results that were computed, measurements were made on a system in the field. These data are compared to the theoretical data and differences are calculated. Theoretical conditions that were studied included uniform cell temperatures and worst case weather scenarios, i.e., no wind, high ambient conditions, and high solar irradiance. The performance of the Amonix high concentrating system could be improved if more waste heat were removed from the cell. Now that a theoretical model has been developed and verified, it will be used to investigate different designs and material for increasing the cooling of the system.

scholarly journals RESEARCH AND DESIGN OF GRID-CONNECTED INVERTER IN PHOTOVOLTAIC SYSTEM WITH SVPWM TECHNIQUE

2020 ◽  
Vol 6 (11) ◽  
pp. 18-31
Author(s):  
Nguyen Duc Minh ◽  
Bui Van Huy ◽  
Ngo Thi Quan ◽  
Nguyen Quang Ninh ◽  
Trinh Trong Chuong
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Experimental Results ◽  
Photovoltaic System ◽  
Photovoltaic Systems ◽  
Space Vector ◽  
Electrical Grid ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Research And Design

This paper presents the design and simulation of three phase grid-connected inverter for photovoltaic systems with power ratings up to 5 kW. In this research, the application of Space Vector Pulse Width Modulation (SVPWM) technique for inverter is explored. With the use of SVPWM inverter, synchronization between the inverter and electrical grid follows the Phaselocked Loop (PLL) algorithm. The proposed design is simulated and validated by experimental results.

scholarly journals FOTODIM—Software for Sizing of Photovoltaic Systems

2019 ◽  
Vol 11 (3) ◽  
pp. 137
Author(s):  
Daisy Regina dos Santos ◽  
Carlos Eduardo Camargo Nogueira ◽  
Felix Augusto Pazuch ◽  
Francielle Pareja Schneider ◽  
Jair Antonio Cruz Siqueira ◽  
...  
Keyword(s):  
Theoretical Basis ◽  
Net Present Value ◽  
Photovoltaic System ◽  
Photovoltaic Systems ◽  
Internal Rate Of Return ◽  
Computational Tool ◽  
Present Value ◽  
Grid Systems ◽  
Digital Book ◽  
Isolated Systems

This study addresses the development of a computational tool for the sizing of photovoltaic systems interconnected to the grid (grid-tied) and isolated (off-grid) systems. The calculations for the sizing were obtained from the CRESESB Engineering Manual for Photovoltaic Systems, the GREENPO Photovoltaic Systems Technology, Design and Installation Manual, and the BLUESOL Solar System Introduction Digital Book. With knowledge of the latitude, longitude and altitude data of the site, the tool calculates the angle of the modules for better absorption of the photovoltaic radiation. For systems connected to the grid, it is also necessary to provide information on the consumption of the building to be serviced by the photovoltaic system. For isolated systems, in addition to information on the site, it is necessary to know the demand and consumption of the building. Decision-making criteria are based on economic analysis, according to indexes such as Net Present Value (NPV), Internal Rate of Return (IRR), and Discounted Payback. The screens developed for the sizing tool and examples of sizing of both photovoltaic systems are presented as results, through tables and graphs. The developed software is reliable, and all calculations have theoretical basis.

scholarly journals The Impact of Application of Photovoltaic Cells for Bus Ecological Properties / Wpływ Zastosowania Ogniw Fotowoltaicznych Na Ekologiczność Autobusu Miejskiego

2012 ◽  
Vol 22 (1) ◽  
pp. 159-170
Author(s):  
Jerzy Merkisz ◽  
Paweł Fuc ◽  
Maciej Bajerlein ◽  
Piotr Lijewski ◽  
Łukasz Rymaniak ◽  
...  
Keyword(s):  
Solar Energy ◽  
Public Transport ◽  
Environmental Performance ◽  
Photovoltaic Cells ◽  
Urban Traffic ◽  
Photovoltaic System ◽  
Relative Influence ◽  
Gas Analyzer ◽  
Measurement Systems ◽  
The Impact

Abstract The paper presents discusses the application of photovoltaic cells and provides information on solar energy in Poland. Article presents examples of research emission two buses, one of them was equipped with additional auxiliary photovoltaic system. Measurements was carried out in on-road, in urban traffic - bus line public transport. For measurement was used mobile gas analyzer included in Portable Emissions Measurement Systems (PEMS). The results have been developed in such a way as to determine the relative influence of the system implemented on the total environmental performance of the vehicle.

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