1,720,969 research outputs found
Cooperativas eléctricas en Argentina
Full text linkEn Argentina, las cooperativas eléctricas tienen una larga trayectoria en el sector y han desempeñado un papel fundamental en garantizar acceso a la energía eléctrica en zonas rurales y periurbanas, como así también en el impulso de la generación renovable.Fil: Rullo, Pablo Gabriel. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gil, Santiago. Cooperativa de Provisión de Servicios Públicos Ramallo; Argentin
Day-ahead optimal operation of active distribution networks with distributed generation and energy storage
No full textIn this work we address the optimal operation in active distribution networks (ADNs) with high penetration of renewable energies and energy storage. The optimal performance of ADNs can include two different optimization problems: Unit Commitment (UC) and Economic Dispatch (ED). The UC problem determines the start-up and shutdown planning of all the dispatchable generation units to supply the electricity demand, minimizing the total cost of operation, while the ED problem determines the active output power of each of the committed units for each hour of the planning horizon. Both problems have the objectives of minimizing the total cost, supplying the demand and complying with the restrictions of the main network. Here the two problems are solved together to achieve the day-ahead optimal operation of active distribution networks with distributed generation and energy storage. A test system based on the IEEE 33-bus distribution network was proposed. The optimal operation problem presented here is analyzed using four scenarios with different renewable generation and load conditions and a time-varying profile for the purchase price of energy from the network. The results reveal that the proposed network together with the optimization methodology can face diverse and highly demanding load situations, with the full use of renewable energies and complying with all the restrictions imposed. The proposed methodology is suitable for use in other optimization problems such as determining the sizing of storage units and distributed generation.Fil: Feroldi, Diego Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y de Sistemas. Universidad Nacional de Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y de Sistemas; ArgentinaFil: Rullo, Pablo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; Argentin
Energy management strategy based on receding horizon for a power hybrid system
Full text linkThis paper presents an energy management strategy to operate a hybrid power system with renewable sources (wind and solar), batteries, and polymeric electrolyte membrane fuel cells. The fuel cells are fed with hydrogen from bioethanol reforming. The energy management strategy uses the concept of receding horizon with predictions of the future generation from the renewable sources, the future load, and the state of charge in the battery bank. Several tests are done in order to analyze the performance of the proposed methodology. The results, compared with the case without predictions, show a reduction in the loss of power supply probability (LPSP) up to 88%.Fil: Rullo, Pablo Gabriel. Universidad Nacional de Rosario. Facultad de Cs.exactas Ingenieria y Agrimensura. Escuela de Cs.exactas y Naturales. Departamento de Ciencias de la Computacion; ArgentinaFil: Zumoffen, David Alejandro Ramon. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y Sistemas; ArgentinaFil: Feroldi, Diego Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y Sistemas; Argentin
Red de distribución y generación distribuida en la cooperativa eléctrica de Ramallo
Full text linkSe presentan los primeros resultados de la colaboración entre la cooperativa eléctrica de Ramallo (COOSPRAL) y el Grupo de Investigación en Energías Renovables (GIDER) de la FRSN-UTN, con el objetivo de explorar la generación distribuida renovable en su área de influenciaFil: Coria, Mirko. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; ArgentinaFil: Buzzio, Sebastián. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; ArgentinaFil: Moreno, Natanael. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; ArgentinaFil: Tielli, Matías. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; ArgentinaFil: Hetze, Vanesa Betiana. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; ArgentinaFil: Rullo, Pablo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnológica Nacional. Facultad Regional Rosario; Argentina. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; Argentina. Cooperativa eléctrica de Ramallo; ArgentinaFil: Gil, Santiago. Cooperativa eléctrica de Ramallo; ArgentinaFil: Dagoberto, Joaquín. Cooperativa eléctrica de Ramallo; Argentin
Desarrollo experimental de un sistema de monitoreo de vibraciones para aerogeneradores: diseño, implementación y evaluación
Full text linkFil: Castello, Marcelo. Observatorio de Energía y Sustentabilidad (OES - FRRo – UTN). Buenos Aires; Argentina.Fil: Salerno, Juan. Observatorio de Energía y Sustentabilidad (OES - FRRo – UTN). Buenos Aires; Argentina.Fil: Marino, Edgardo. Observatorio de Energía y Sustentabilidad (OES - FRRo – UTN). Buenos Aires; Argentina.Fil: Chemes, Jorge. Universidad Nacional de Río Negro. Instituto de Estudios en Ciencia, Tecnología, Cultura y Desarrollo (CITECDE). Río Negro; Argentina.Fil: Rullo, Pablo. Grupo de Investigación de Energías Renovables (GIDER – FRSN – UTN). Buenos Aires; Argentina.Este artículo presenta el diseño integral de un sistema de monitoreo de vibraciones para aerogeneradores de baja potencia. El sistema propuesto incluye los dispositivos de hardware necesarios para el sensado de vibraciones y velocidad, la arquitectura de comunicación para la transmisión de datos, y una aplicación para el análisis y visualización gráfica. El diseño abarca de manera sistemática todos los subsistemas tanto a nivel de hardware como de software. Las etapas de diseño e implementación se llevaron a cabo con éxito, resultando en un sistema de monitoreo que ofrece funcionalidades similares que los sistemas comerciales pero con total disponibilidad de los datos obtenidos. Tanto fabricantes como usuarios de turbinas eólicas de baja potencia enfrentan desafíos en términos de seguridad mecánica, durabilidad y mantenimiento. El monitoreo de vibraciones es crucial para garantizar una operación segura y eficiente. Los costos de los sistemas comerciales de medición, control y seguimiento de turbinas eólicas suelen ser elevados, haciéndolos inaccesibles para las cooperativas energéticas. Este trabajo busca superar estas limitaciones
técnico-económicas mediante el desarrollo de soluciones locales, promoviendo así el potencial de la generación eólica de baja potencia a nivel nacional y regiona
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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