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Mr. José Ignacio Aragones
Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Zaragoza 50009, Spain

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0 Electronics
0 Sensors
0 nanotech
0 Spintronic
0 Renewable and bio energy

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Journal article
Published: 18 June 2021 in Journal of Physics D: Applied Physics
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ACS Style

Soraya Sangiao; José Ignacio Morales; Irene Lucas; Maria Pilar Jiménez Cavero; Luis Morellon; Carlos Sánchez-Azqueta; Jose Maria de Teresa. Optimization of YIG/Bi stacks for spin-to-charge conversion and influence of aging. Journal of Physics D: Applied Physics 2021, 1 .

AMA Style

Soraya Sangiao, José Ignacio Morales, Irene Lucas, Maria Pilar Jiménez Cavero, Luis Morellon, Carlos Sánchez-Azqueta, Jose Maria de Teresa. Optimization of YIG/Bi stacks for spin-to-charge conversion and influence of aging. Journal of Physics D: Applied Physics. 2021; ():1.

Chicago/Turabian Style

Soraya Sangiao; José Ignacio Morales; Irene Lucas; Maria Pilar Jiménez Cavero; Luis Morellon; Carlos Sánchez-Azqueta; Jose Maria de Teresa. 2021. "Optimization of YIG/Bi stacks for spin-to-charge conversion and influence of aging." Journal of Physics D: Applied Physics , no. : 1.

Review
Published: 27 May 2021 in Electronics
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Current–voltage (I–V) curve tracers are used for measuring voltage and current in photovoltaic (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.

ACS Style

José Morales-Aragonés; Miguel Dávila-Sacoto; Luis González; Víctor Alonso-Gómez; Sara Gallardo-Saavedra; Luis Hernández-Callejo. A Review of I–V Tracers for Photovoltaic Modules: Topologies and Challenges. Electronics 2021, 10, 1283 .

AMA Style

José Morales-Aragonés, Miguel Dávila-Sacoto, Luis González, Víctor Alonso-Gómez, Sara Gallardo-Saavedra, Luis Hernández-Callejo. A Review of I–V Tracers for Photovoltaic Modules: Topologies and Challenges. Electronics. 2021; 10 (11):1283.

Chicago/Turabian Style

José Morales-Aragonés; Miguel Dávila-Sacoto; Luis González; Víctor Alonso-Gómez; Sara Gallardo-Saavedra; Luis Hernández-Callejo. 2021. "A Review of I–V Tracers for Photovoltaic Modules: Topologies and Challenges." Electronics 10, no. 11: 1283.

Journal article
Published: 12 March 2021 in Electronics
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The measurement of current–voltage (I-V) curves of single photovoltaic (PV) modules is at this moment the most powerful technique regarding the monitoring and diagnostics of PV plants, providing accurate information about the possible failures or degradation at the module level. Automating these measurements and allowing them to be made online is strongly desirable in order to conceive a systematic tracking of plant health. Currently, I-V tracers present some drawbacks, such as being only for the string level, working offline, or being expensive. Facing this situation, the authors have developed two different low-cost online I-V tracers at the individual module level, which could allow for a cost-affordable future development of a fully automated environment for the tracking of the plant status. The first system proposed implements a completely distributed strategy, since all the electronics required for the I-V measurement are located within each of the modules and can be executed without a power line interruption. The second one uses a mixed strategy, where some common electronics are moved from PV modules to the inverter or combiner box and need an automated very short disconnection of the modules string under measurement. Experiments show that both strategies allow the tracing of individual panel I-V curves and sending of the data afterwards in numerical form to a central host with a minimum influence on the power production and with a low-cost design due to the simplicity of the electronics. A comparison between both strategies is exposed, and their costs are compared with the previous systems proposed in the literature, obtaining cost reductions of over 80–90% compared with actual commercial traces.

ACS Style

José Morales-Aragonés; Sara Gallardo-Saavedra; Víctor Alonso-Gómez; Francisco Sánchez-Pacheco; Miguel González; Oscar Martínez; Miguel Muñoz-García; María Alonso-García; Luis Hernández-Callejo. Low-Cost Electronics for Online I-V Tracing at Photovoltaic Module Level: Development of Two Strategies and Comparison between Them. Electronics 2021, 10, 671 .

AMA Style

José Morales-Aragonés, Sara Gallardo-Saavedra, Víctor Alonso-Gómez, Francisco Sánchez-Pacheco, Miguel González, Oscar Martínez, Miguel Muñoz-García, María Alonso-García, Luis Hernández-Callejo. Low-Cost Electronics for Online I-V Tracing at Photovoltaic Module Level: Development of Two Strategies and Comparison between Them. Electronics. 2021; 10 (6):671.

Chicago/Turabian Style

José Morales-Aragonés; Sara Gallardo-Saavedra; Víctor Alonso-Gómez; Francisco Sánchez-Pacheco; Miguel González; Oscar Martínez; Miguel Muñoz-García; María Alonso-García; Luis Hernández-Callejo. 2021. "Low-Cost Electronics for Online I-V Tracing at Photovoltaic Module Level: Development of Two Strategies and Comparison between Them." Electronics 10, no. 6: 671.

Journal article
Published: 22 February 2021 in Applied Sciences
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The inspection techniques for defects in photovoltaic modules are diverse. Among them, the inspection with measurements using current–voltage (I-V) curves is one of the most outstanding. I-V curves, which can be carried under illumination or in dark conditions, are widely used to detect certain defects in photovoltaic modules. In a traditional way, these measurements are carried out by disconnecting the photovoltaic module from the string inside the photovoltaic plant. In this work, the researchers propose a methodology to perform online dark I-V curves of modules in photovoltaic plants without the need of disconnecting them from the string. For this, a combination of electronic boards in the photovoltaic modules and a bidirectional inverter are employed. The results are highly promising, and this methodology could be widely used in upcoming photovoltaic plants.

ACS Style

José Morales-Aragonés; María Alonso-García; Sara Gallardo-Saavedra; Víctor Alonso-Gómez; José Balenzategui; Alberto Redondo-Plaza; Luis Hernández-Callejo. Online Distributed Measurement of Dark I-V Curves in Photovoltaic Plants. Applied Sciences 2021, 11, 1924 .

AMA Style

José Morales-Aragonés, María Alonso-García, Sara Gallardo-Saavedra, Víctor Alonso-Gómez, José Balenzategui, Alberto Redondo-Plaza, Luis Hernández-Callejo. Online Distributed Measurement of Dark I-V Curves in Photovoltaic Plants. Applied Sciences. 2021; 11 (4):1924.

Chicago/Turabian Style

José Morales-Aragonés; María Alonso-García; Sara Gallardo-Saavedra; Víctor Alonso-Gómez; José Balenzategui; Alberto Redondo-Plaza; Luis Hernández-Callejo. 2021. "Online Distributed Measurement of Dark I-V Curves in Photovoltaic Plants." Applied Sciences 11, no. 4: 1924.

Journal article
Published: 28 May 2020 in Energy
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Photovoltaic (PV) modules are the core of every PV system, representing the power generation and their operation will affect the overall plant performance. It is one of the elements within a PV site with the higher failure appearance, being essential their proper operation to produce reliable, efficient and safety energy. Quantitative analysis and characterization of manufacturing, soldering and breaking PV defects is performed by a combination of electroluminescence (EL), infrared thermography (IRT), electrical current voltage (I–V) curves and visual inspection. Equivalent-circuit model characterization and microscope inspection are also performed as additional techniques when they contribute to the defects characterization. A 60-cells polycrystalline module has been ad hoc manufactured for this research, with different defective and non-defective cells. All cells are accessible from the backside of the module and the module includes similar kinds of defects in the same bypass string. This paper characterizes different defects of PV modules to control, mitigate or eliminate their influence and being able to do a quality assessment of a whole PV module, relating the individual cells performance with the combination of defective and non-defective cells within the module strings, with the objective of determining their interaction and mismatch effects, apart from their discrete performance.

ACS Style

Sara Gallardo-Saavedra; Luis Hernández-Callejo; Carmen Alonso-Garcia; José Domingo Santos; José Ignacio Morales; Víctor Alonso-Gómez; Ángel Moretón-Fernández; Miguel Ángel González-Rebollo; Oscar Martínez-Sacristán. Nondestructive characterization of solar PV cells defects by means of electroluminescence, infrared thermography, I–V curves and visual tests: Experimental study and comparison. Energy 2020, 205, 117930 .

AMA Style

Sara Gallardo-Saavedra, Luis Hernández-Callejo, Carmen Alonso-Garcia, José Domingo Santos, José Ignacio Morales, Víctor Alonso-Gómez, Ángel Moretón-Fernández, Miguel Ángel González-Rebollo, Oscar Martínez-Sacristán. Nondestructive characterization of solar PV cells defects by means of electroluminescence, infrared thermography, I–V curves and visual tests: Experimental study and comparison. Energy. 2020; 205 ():117930.

Chicago/Turabian Style

Sara Gallardo-Saavedra; Luis Hernández-Callejo; Carmen Alonso-Garcia; José Domingo Santos; José Ignacio Morales; Víctor Alonso-Gómez; Ángel Moretón-Fernández; Miguel Ángel González-Rebollo; Oscar Martínez-Sacristán. 2020. "Nondestructive characterization of solar PV cells defects by means of electroluminescence, infrared thermography, I–V curves and visual tests: Experimental study and comparison." Energy 205, no. : 117930.

Journal article
Published: 28 April 2020 in Applied Sciences
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Nowadays, photovoltaic (PV) silicon plants dominate the growth in renewable energies generation. Utility-scale photovoltaic plants (USPVPs) have increased exponentially in size and power in the last decade and, therefore, it is crucial to develop optimum maintenance techniques. One of the most promising maintenance techniques is the study of electroluminescence (EL) images as a complement of infrared thermography (IRT) analysis. However, its high cost has prevented its use regularly up to date. This paper proposes a maintenance methodology to perform on-site EL inspections as efficiently as possible. First, current USPVP characteristics and the requirements to apply EL on them are studied. Next, an increase over the automation level by means of adding automatic elements in the current PV plant design is studied. The new elements and their configuration are explained, and a control strategy for applying this technique on large photovoltaic plants is developed. With the aim of getting on-site EL images on a real plant, a PV inverter has been developed to validate the proposed methodology on a small-scale solar plant. Both the electrical parameters measured during the tests and the images taken have been analysed. Finally, the implementation cost of the solution has been calculated and optimised. The results conclude the technical viability to perform on-site EL inspections on PV plants without the need to measure and analyse the panel defects out of the PV installation.

ACS Style

Javier Ballestín-Fuertes; Jesús Muñoz-Cruzado-Alba; José F. Sanz-Osorio; Luis Hernández-Callejo; Victor Alonso-Gómez; José Ignacio Morales-Aragones; Sara Gallardo-Saavedra; Oscar Martínez-Sacristan; Ángel Moretón-Fernández. Novel Utility-Scale Photovoltaic Plant Electroluminescence Maintenance Technique by Means of Bidirectional Power Inverter Controller. Applied Sciences 2020, 10, 3084 .

AMA Style

Javier Ballestín-Fuertes, Jesús Muñoz-Cruzado-Alba, José F. Sanz-Osorio, Luis Hernández-Callejo, Victor Alonso-Gómez, José Ignacio Morales-Aragones, Sara Gallardo-Saavedra, Oscar Martínez-Sacristan, Ángel Moretón-Fernández. Novel Utility-Scale Photovoltaic Plant Electroluminescence Maintenance Technique by Means of Bidirectional Power Inverter Controller. Applied Sciences. 2020; 10 (9):3084.

Chicago/Turabian Style

Javier Ballestín-Fuertes; Jesús Muñoz-Cruzado-Alba; José F. Sanz-Osorio; Luis Hernández-Callejo; Victor Alonso-Gómez; José Ignacio Morales-Aragones; Sara Gallardo-Saavedra; Oscar Martínez-Sacristan; Ángel Moretón-Fernández. 2020. "Novel Utility-Scale Photovoltaic Plant Electroluminescence Maintenance Technique by Means of Bidirectional Power Inverter Controller." Applied Sciences 10, no. 9: 3084.

Conference paper
Published: 05 January 2020 in Communications in Computer and Information Science
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Within this paper it is proposed the design and development of an instrument with extended capabilities for photovoltaic (PV) devices I/V tracing. Commercial instruments that measure I-V curves from PV devices are suitable for a wide range of applications. However, more specific research and measurements require developing customized equipment. Custom-made development provides flexibility, and allows to implement tailored algorithms and to have accurate control of obtained information. Full control offers better flexibility for testing and extends the measurement possibilities. Designed I-V tester is capable to measure low voltages and manages very low resistance load to provide short circuit current values with voltages close to zero.

ACS Style

Bhishma Hernández-Martínez; Sara Gallardo-Saavedra; Luís Hernández-Callejo; Víctor Alonso-Gómez; José Ignacio Morales-Aragonés. General Purpose I-V Tester Developed to Measure a Wide Range of Photovoltaic Systems. Communications in Computer and Information Science 2020, 135 -145.

AMA Style

Bhishma Hernández-Martínez, Sara Gallardo-Saavedra, Luís Hernández-Callejo, Víctor Alonso-Gómez, José Ignacio Morales-Aragonés. General Purpose I-V Tester Developed to Measure a Wide Range of Photovoltaic Systems. Communications in Computer and Information Science. 2020; ():135-145.

Chicago/Turabian Style

Bhishma Hernández-Martínez; Sara Gallardo-Saavedra; Luís Hernández-Callejo; Víctor Alonso-Gómez; José Ignacio Morales-Aragonés. 2020. "General Purpose I-V Tester Developed to Measure a Wide Range of Photovoltaic Systems." Communications in Computer and Information Science , no. : 135-145.