53 research outputs found
Photovoltaic Power Nowcasting Using Decision-Trees Based Algorithms and Neural Networks
No full textPrecise Photovoltaic (PV) power forecasting tools are needed to integrate PV into the new framework of the energy sector. Also, the related intermittent and random nature needs to be appropriately considered. In this context, this paper examines various machine learning algorithms used for one hour ahead forecasting of PV power production. Specifically, the performances of two Long Short-Term Memory (LSTM) recurrent neural networks, a Gradient Boost Machine (GBM) model and an Extreme Gradient Boosting (XGB) model, are compared. Six years of data are retrieved from the 81 kW PV power plant in the Savona campus of the University of Genoa and are used to train and test the algorithms. The performances of all the algorithms are compared over the original dataset, composed of meteorological variables linked with the PV production, a dataset using seasonal and trend decomposition (STL) of the meteorological variables, and some reduced datasets that mimic the situation in which some of the features are not available at least for some time steps. By comparing the results through different case studies, it can be justified that the XGB outperforms the other algorithms and the STL decomposition is helpful in increasing the performance of the model
An Energy Management System to Optimize the Participation in the Day Ahead and Ancillary Service Markets
No full textThis paper presents the evolution of an Energy Management System developed by University of Genoa aimed at minimizing the operation costs of plants and Microgrids (MGs). In the updated version, the Ancillary Service Market (ASM) and Day Ahead Market (DAM) mechanisms are modelled to include the possibility of trading in these markets. Since the Transmission System Operator (TSO) rejection or acceptance in the ASM cannot be forecasted, a statistical approach is proposed. Specifically, the optimization process is divided in two steps: initially the optimal dispatching program is computed, identifying DAM offers and ASM bid and offers that can be proposed. Then, a Monte Carlo method is implemented: by receiving a user defined acceptance rate, the TSO decisions are simulated by extracting sets of awarded proposals from a Probability Density Function (PDF). For each extraction, the second step of the optimization re-dispatches the units based on the bidding program. A PDF of the revenues/costs is the final outcome. Thereafter, the statistical moments of the resulting PDF can be analysed to estimate the profitability of the participation to the markets. A test performed on a real plant over one year demonstrates that longtime horizons may be simulated within reasonable computational time allowing to maintain a high level of details to model devices and markets
Cost Optimization Incorporating Photovoltaic Power Forecasts Using Neural Networks in an Energy Management System
No full textThis paper introduces a receding horizon method designed to integrate updated Photovoltaic (PV) power generation forecasts into an effective Energy Management System (EMS). At first, three RNN PV-based forecasting algorithms are compared to find the best architecture based on evaluation metrics, and the most accurate is utilized to estimate the PV power production. Secondly, the best-performing algorithm feeds into the EMS PV power production data. In addition, the feeding process compares two approaches. In the first one, PV forecasts are updated every hour, and the EMS is run to optimize dispatch decisions for the upcoming 23 hours. In the second method, the PV forecast is received at midnight, and the EMS optimizes decisions. The proposed joint approach is verified using an accurate EMS and by comparing the results with the real PV power data benchmark. Hence, the results indicate that the dispatching of units can be accurately predicted using the proposed forecasting techniques, with the hourly update approach yielding the most precise outcomes
A Simulator for Long Term Planning and Real Time Scheduling of Polygenerative Microgrids
No full textLe pyrgos de Kabalaréos, alias pyrgos du roi Milutin
No full textAn Athonite pyrgos situatued half-way on the road between Chilandar monastery and its quai is attributed by tradition and on the basis of the supposed date of construction to King Milutin of Serbia. By analysis of one well known but little used source as well as another recently published the author concludes that there is sufficient evidence to identify the pyrgos as that of Kabalareos, apparently the name of the founder or restorer of the monument.REB 60 2002 France p. 209-213
Aleksandar Fotić, Le pyrgos de Kabalaréos, alias pyrgos du roi Milutin. — Un pyrgos de l'Athos, sis à proximité de Chilandar, à mi-chemin sur la route conduisant de ce monastère à son débarcadère, est rattaché par la tradition et, de fait, par la date supposée de sa construction, au roi de Serbie Milutin. En analysant deux sources, l'une connue depuis longtemps, mais négligée, et l'autre, récemment publiée, l'auteur en conclut que cette tour peut désormais être nommée pyrgos de Kabalaréos. Un personnage de ce nom en aurait été le fondateur, l'ayant entièrement restauré, voire fait ériger.Fotić Aleksandar. Le pyrgos de Kabalaréos, alias pyrgos du roi Milutin. In: Revue des études byzantines, tome 60, 2002. pp. 209-213
Le pyrgos de Kabalaréos, alias pyrgos du roi Milutin
No full textAn Athonite pyrgos situatued half-way on the road between Chilandar monastery and its quai is attributed by tradition and on the basis of the supposed date of construction to King Milutin of Serbia. By analysis of one well known but little used source as well as another recently published the author concludes that there is sufficient evidence to identify the pyrgos as that of Kabalareos, apparently the name of the founder or restorer of the monument.</jats:p
Milutin Gubash & le désir d'extimité : sa vie, son œuvre
No full textMilutin Gubash is a Serbian and Canadian artist. He lives and works in Montreal (Quebec) since 2005, and was born in 1969 in Novi Sad, in ex-Yugoslavia. He leaves this country, which does not exist anymore, at the age of three years old to settle in Calgary, Alberta (Canada), under the choice of his father. After going to the University, Milutin Gubash establishes his own artistic practice in 2002 using as photography as video, as well as performance. His art focuses on identity research, which reflects his own life and experience of a political immigrant. Gubash makes his own personal investigations the starting point of his artistic production, questioning this way the boundaries in-between private and public. Artist-author and actor of his life and works (performances, videos, and photos) the artist use his own person as well as his family as characters into his stories. Then, the specificity of Milutin Gubash work is the exhibition of his private and intimate life into his art. "Extimacy" is a psychoanalyst term that defines the human tendency to exhibit our intimacy in front of public audience. Serge Tisseron, a French psychoanalyst reuses this concept in 2001 and refines the original Lacanian definition. "Extimacy" came out into the contemporary art during our last decade through narrative and autobiographical practices, and serves here as an opening to Milutin Gubash oeuvreMilutin Gubash est un artiste serbe et canadien. Il vit et travaille à Montréal (Québec) depuis 2005, et est né en 1969 à Novi Sad, en ex-Yougoslavie. Ce pays qui n'existe plus aujourd'hui, il le quitte à l'âge de trois ans pour s'établir à Calgary, en Alberta (Canada) sous l'engouement de son père. Après un passage par l'université, Milutin Gubash développe une pratique artistique dès 2002 et produit un art multiforme, allant de la vidéo, à la photo et à la performance. Il oriente l'essentiel de sa démarche artistique autour d'un questionnement identitaire propre à la figure de l'immigré politique. Il fait de ses recherches personnelles le point de départ de ses créations qui interrogent les limites entre la sphère privée et publique. Artiste, auteur, et acteur, de sa vie et dans ses œuvres (performances, vidéos et photos) Milutin Gubash utilise les membres de sa famille comme personnages pour de nouveaux récits. En effet, la particularité du travail de Milutin Gubash est l'exposition de sa vie privée, et intime, dans son œuvre. "Extimité" est un terme issu de la psychanalyse, il désigne la tendance inhérente à l'être humain à s'exposer soi-même. Serge Tisseron, reprend ce terme prononcé une premier fois pas Lacan en 1968, et précise sa définition. Apparu dans le monde de l'art contemporain au cours des dix dernières années, l'extimité sert d'ouverture à l'œuvre de Milutin Gubash
Milutin Gubash & le désir d'extimité : sa vie, son œuvre
No full textMilutin Gubash is a Serbian and Canadian artist. He lives and works in Montreal (Quebec) since 2005, and was born in 1969 in Novi Sad, in ex-Yugoslavia. He leaves this country, which does not exist anymore, at the age of three years old to settle in Calgary, Alberta (Canada), under the choice of his father. After going to the University, Milutin Gubash establishes his own artistic practice in 2002 using as photography as video, as well as performance. His art focuses on identity research, which reflects his own life and experience of a political immigrant. Gubash makes his own personal investigations the starting point of his artistic production, questioning this way the boundaries in-between private and public. Artist-author and actor of his life and works (performances, videos, and photos) the artist use his own person as well as his family as characters into his stories. Then, the specificity of Milutin Gubash work is the exhibition of his private and intimate life into his art. "Extimacy" is a psychoanalyst term that defines the human tendency to exhibit our intimacy in front of public audience. Serge Tisseron, a French psychoanalyst reuses this concept in 2001 and refines the original Lacanian definition. "Extimacy" came out into the contemporary art during our last decade through narrative and autobiographical practices, and serves here as an opening to Milutin Gubash oeuvreMilutin Gubash est un artiste serbe et canadien. Il vit et travaille à Montréal (Québec) depuis 2005, et est né en 1969 à Novi Sad, en ex-Yougoslavie. Ce pays qui n'existe plus aujourd'hui, il le quitte à l'âge de trois ans pour s'établir à Calgary, en Alberta (Canada) sous l'engouement de son père. Après un passage par l'université, Milutin Gubash développe une pratique artistique dès 2002 et produit un art multiforme, allant de la vidéo, à la photo et à la performance. Il oriente l'essentiel de sa démarche artistique autour d'un questionnement identitaire propre à la figure de l'immigré politique. Il fait de ses recherches personnelles le point de départ de ses créations qui interrogent les limites entre la sphère privée et publique. Artiste, auteur, et acteur, de sa vie et dans ses œuvres (performances, vidéos et photos) Milutin Gubash utilise les membres de sa famille comme personnages pour de nouveaux récits. En effet, la particularité du travail de Milutin Gubash est l'exposition de sa vie privée, et intime, dans son œuvre. "Extimité" est un terme issu de la psychanalyse, il désigne la tendance inhérente à l'être humain à s'exposer soi-même. Serge Tisseron, reprend ce terme prononcé une premier fois pas Lacan en 1968, et précise sa définition. Apparu dans le monde de l'art contemporain au cours des dix dernières années, l'extimité sert d'ouverture à l'œuvre de Milutin Gubash
On the first marriage of king Milutin
No full textУ раду се разматра питање првог брака српског краља Стефана Уроша II (Милутина), који помиње византијски писац Георгије Пахимер, с циљем да се поткрепи постојећа теза да је у питању брак са српском властелинком по имену Јелена, који је склопљен током седамдесетих година XIII века, али разведен убрзо по Милутиновом ступању на српски престо 1282. године. Пружа се, такође, и осврт на природу и карактер тог брака и могуће разлоге због којих је био разведен и проглашен неважећим.The paper deals with the problem of the first marriage of the Serbian king Stephen Uroš II (Milutin), mentioned by the Byzantine author George Pachymeres, wtih the aim to reinforce the existing thesis that it was a marriage with a Serbian noble Helen, concluded in the 1270-ies, but divorced soon after he came to the Serbian throne in 1282. It also provides an overview of the nature and character of that marriage and the possible reasons why it was dissolved and declared invalid
The description of Kabarda by D.A. Milutin in the context of the cauсasus version of russian orien-talism foundation
No full textThe paper pertains to the analysis of a manuscript authored by D.A. Milutin in the first half of the 19th century, regarding the region of Kabarda. This manuscript, hitherto unpublished in academic circles, has been the subject of our examination. Our endeavor was to uncover the utilization of orientalist clichés by the manuscript's author, in order to depict both the geographical delineations of this ethno-political entity and the ethnography, livelihood, societal structure, and customary legal norms of its inhabitants. A remarkable parallel can be observed between certain aspects of the manuscript and the ideas propounded by E. Said in his discourse on European Orientalism. The researcher drew a comparison between the political framework and traditions of the Kabardian people and those prevalent in Europe. Moreover, the researcher romanticized the region's historical past, employing the conceptof "reverse human progress," along with other typical methodologies embraced by Orientalist thinkers of that era. Concomitantly, D.A. Milutin provided detailed descriptions of the political, social, and everyday existence in Kabarda, thereby endowing the manuscript with an intrinsic value as an original historical and cultural resource for contemporary scholars. It is concluded that, similar to numerous analogous texts produced by Orientalist scholars, the significance of D.A. Milutin's man-uscript lies not in its political arguments concerning the military and economic dominion of the Russian Empire over the Caucasian peoples, or the imperative to extend colonial governance to these ethnic territorie
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