Browsing by Author "Davila Sacoto, Miguel Alberto"

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A review of I–V tracers for photovoltaic modules: topologies and challenges
(2021) Morales Aragonés, José Ignacio; Davila Sacoto, Miguel Alberto; Gonzalez Morales, Luis Gerardo; Alonso Gómez, Víctor; Gallardo Saavedra, Sara; Hernandez Callejo, Luis
ltage (I–V) curve tracers are used for measuring voltage and current in pho-tovoltaic (PV) modules. I–V curves allow identifying certain faults in the photovoltaic module, as well as quantifying the power performance of the device. I–V curve tracers are present in different topologies and configurations, by means of rheostats, capacitive loads, electronic loads, transistors, or by means of DC–DC converters. This article focuses on presenting all these configurations. The paper shows the electrical parameters to which the electronic elements of the equipment are exposed using LTSpice, facilitating the appropriate topology selection. Additionally, a comparison has been included between the different I–V tracers’ topologies, analyzing their advantages and disadvantages, considering different factors such as their flexibility, modularity, cost, precision, speed or rating, as well as the characteristics of the different DC–DC converters.
Charge management of electric vehicles from undesired dynamics in solar photovoltaic generation
(2022) Zorita Lamadrid, Ángel Luis; Davila Sacoto, Miguel Alberto; Gonzalez Morales, Luis Gerardo; Aguirre Pardo, Ivania Carolina; Duque Pérez, Óscar; Hernández Callejo, Luis; Espinoza Abad, Juan Leonardo
Power generation from photovoltaic solar systems contributes to mitigate the problem of climate change. However, the intermittency of solar radiation affects power quality and causes instability in power grids connected to these systems. This paper evaluates the dynamic behavior of solar radiation in an Andean city, which presents rapid power variations that can reach an average of 7.20 kW/min and a variability coefficient of 32.09%. The study applies the ramp-rate control technique to reduce power fluctuations at the point of common coupling (PCC), with the incorporation of an energy storage system. Electric vehicle batteries were used as the storage system due to their high storage capacity and contribution to power system flexibility. The application of the control strategy shows that, with a minimum of five electric vehicle charging stations at the PCC, the rate of change of the photovoltaic can be reduced by 14%.
Detecting hot spots in photovoltaic panels using low-cost thermal cameras
(Springer, 2020) Davila Sacoto, Miguel Alberto; Hernández Callejo, Luís; Alonso Gómez, Víctor; Gallardo Saavedra, Sara; Gonzalez Morales, Luis Gerardo
One of the most important challenges to mitigate global climate change is to move towards replacing petroleum-based energy sources. In this idea, non-conventional renewable energy sources such as photovoltaic (PV) solar and wind power are the most used worldwide. In the case of the massification of PV solar generation systems due to its low cost, it has resulted in the use of large-scale supervision techniques that allow a quick and effective determination of the health status of its main components. This study, performs an analysis of the performance of different low-cost cameras for thermography. The analysis compares the accuracy of the thermal images obtained and the error is quantified by means of an image dispersion analysis in each of them. Three-dimensional meshes and contours figures are also made to determine the temperature of a faulty cell. The study shows that the performance obtained with low-cost cameras presents errors below 10% in costs and less than 0.015 USD/pixel. © Springer Nature Switzerland AG 2020.
Low cost infrared thermography in aid of photovoltaic panels degradation research
(2021) Davila Sacoto, Miguel Alberto; Jurado Melguizo, Francisco; Alonso Gómez, Víctor; Gallardo Saavedra, Sara; Gonzalez Morales, Luis Gerardo
The analysis of PV solar panels deterioration allows researchers to know the health status of a panel in order to determine the overall functioning of a PV solar farm. A part of this analysis is performed by thermography, generally using professional and expensive equipment. This article presents a validation for the use of low-cost thermal imaging cameras, reviewing the relative error that can be obtained through scattering, contour analysis and three-dimensional meshes. The procedure is validated by analysis of I-V/P-V curves and a temperature sensor matrix, reaching errors less than 10% with cameras with less than 500USD.