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1
artículo
Publicado 2019
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The present article exposes the development of the research on the modeling of the windings of a power transformer to determine and analyze the transient voltages transferred to the secondary winding when an atmospheric impulse voltage is applied to the primary winding. Each winding is modeled considering its geometric and constructive form by means of concentrated electrical parameters - Resistance, Dielectric Conductance, Series Capacitances, Earth Capacitance, Inductiveness and Mutual Inductance - calculated with conventional formulations, which are incorporated into an integral model of the windings that explains his behavior in front of surges. The analysis is carried out with the support of a software of fast transients in the time domain, being able to demonstrate the utility of the model since it is possible to calculate, inside the windings, the transient voltages propagated and...
2
artículo
Publicado 2019
Enlace
Enlace
The present article exposes the development of the research on the modeling of the windings of a power transformer to determine and analyze the transient voltages transferred to the secondary winding when an atmospheric impulse voltage is applied to the primary winding. Each winding is modeled considering its geometric and constructive form by means of concentrated electrical parameters - Resistance, Dielectric Conductance, Series Capacitances, Earth Capacitance, Inductiveness and Mutual Inductance - calculated with conventional formulations, which are incorporated into an integral model of the windings that explains his behavior in front of surges. The analysis is carried out with the support of a software of fast transients in the time domain, being able to demonstrate the utility of the model since it is possible to calculate, inside the windings, the transient voltages propagated and...
3
artículo
Publicado 2019
Enlace
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In this work three mathematical models of transmission lines are shown, the most used, to simulate electromagnetic transients in power systems. In addition, its main characteristics, advantages and disadvantages are mentioned. Likewise, the algorithms are shown in the form of flow charts for the simulations of the transients. Finally, the results of simulations of maneuvering surges in a single-phase transmission line using the MATLAB software are shown.
4
artículo
Publicado 2019
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In this work three mathematical models of transmission lines are shown, the most used, to simulate electromagnetic transients in power systems. In addition, its main characteristics, advantages and disadvantages are mentioned. Likewise, the algorithms are shown in the form of flow charts for the simulations of the transients. Finally, the results of simulations of maneuvering surges in a single-phase transmission line using the MATLAB software are shown.
5
tesis de grado
Publicado 2014
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La tesis presenta un análisis comparativo del comportamiento no lineal de los casos típicos de conexiones empernadas en base a su resistencia, ductilidad y rigidez lo que permite diferenciar cuáles de ellas pueden ser consideradas como flexibles, rígidas o semirrígidas. Con la curva momento vs rotación se pueden modelar las conexiones empernadas y realizar el análisis estructural de los pórticos. Para la investigación se estudiaron las normas AISC LRFD (1999), Eurocódigo 3 (1993) , Norma Peruana E-090 (2006) y se profundizó en el estudio del Método Power Model 3D. Finalmente se incluye un ejemplo práctico que puede ser usado como guía por el ingeniero estructural.
6
artículo
Publicado 2022
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An experimental model of a wind solar chimney for electrical supply was developed, firstly, the most suitable geographic space was selected for the implementation of the model. Next, we carried out a study in order to determine the environmental, wind and solar parameters using the viewers of the Ministry of Energy and Mines; Taking renewable energy resources as a starting point, a pre-dimensioning was established in order to guarantee economic and technical viability to be able to build the model.The theory of similarity was applied to define the preliminary geometry of the chimney considering built plants as referents, marking the difference of adding two additional subsystems, one wind and the other photovoltaic in order to give it greater autonomy; the wind subsystem located in the upper part of the chimney and the photovoltaic subsystem along the outer surface of the chimney collect...
7
artículo
Publicado 2019
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A proposal is presented in which the respective energy analysis is carried out to characterize the calorific value of commercial gasolines in Ecuador as: Super, Extra and Ecopaís. This study is carried out in the laboratory of internal combustion engines of the University of the Armed Forces-ESPE, with the purpose of obtaining mathematical models that relate the energy and quality parameters of gasolines.Models that will be obtained through computational tools such as artificial neural network (ANN), which will use a set of historical data provided by the Agency for Regulation and Control of Hydrocarbons (ARCH) of Ecuador, for validation.
8
tesis de maestría
Publicado 2020
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Descargue el texto completo en el repositorio institucional de la Universidade Estadual de Campinas: https://hdl.handle.net/20.500.12733/1639832
9
artículo
Publicado 2008
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The definition of the form of authority that was dominating the Lurín and neighboring valleys during the late periods continues being an object of debate. Ethnohistorical sources have been massively used to reconstruct the socio-political regional framework before the Incas. Though certain authors defend a model of theocratic power dominated by the priests of Ychsma-Pachacamac’s cult, others propose a division of the authority between priests and curacas, i.e. between religious and secular. Monumental architecture and settlement patterns provide interesting information to feed this debate. Concretely, I compare this set of archaeological data with the information gathered in the Lurín valley before the reforms of Toledo. It confirms the importance of curacas, their subdivisions and hierarchies, and the absence of link with the religious sphere, but rather with the most secular aspect...
10
artículo
Publicado 2023
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The article explores the evolution of energy sources from biomass to today's sustainable ones, emphasizing the historical relationship between humans and nature. Although coal drove the Industrial Revolution, with negative impacts, the current global priority is the transition to more sustainable energies. It suggests the use of distributed microgrids to generate energy, promoting investments in renewables and providing financial and socioeconomic benefits. Microgrids, essential in smart grids, optimize reliability and costs, managing hybrid sources and storage. Efficient integration of solar energy in microgrids is crucial, backed by research with neural networks. Direct current microgrids represent a breakthrough. From the financial perspective, rural electrification and solar "soft technology" are analyzed, with emphasis on the influence of "Startups" (a newly created company that, th...
11
artículo
Publicado 1976
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This article pose the hypothesis that the terms of trade resulting from the interaction of market forces are the expression of the power relations that exist between the interest groups of a social system. An analytical framework to test this hypothesis is applied to the case of oil prices and theoretical implications are derived for the economic models, that should consider the power variable into their theory of prices.
12
artículo
Publicado 2022
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In Chilean law, difficulties arise when it comes to ascribing criminal responsibility to corporate management bodies that give orders to their subordinates to commit intentional crimes of domination, which is explained by a variety of reasons, both dogmatic and of positive law. According to the “individual ascription of legal responsibility model”, the direct perpetrator of a crime is the person who carries out both the actus rea and means rea of an offence, without grounds for justificatory or excusatory defenses of guilt. Due to the existing division between making decisions and taking action in the corporate sphere, management bodies do not typically carry out the respective criminal conduct and, consequently, cannot be perceived as principal perpetrators. Moreover, they will often avoid making co-perpetration contributions, a...
13
artículo
The Unified power flow controller (UPFC) is the most important contribution of the power electronics in the modern Electrical Power Systems. The UPFC is able to decouple the control of the active and reactive power sent trough the transmission line. This control is performed byinjecting in series with the transmission line a voltage with regulated magnitude and phase, generated by a PWM voltage source inverter (VSI). When the current flow in the line originate in the inverter an active and reactive power. The active part of the power require to be eithersupplied or absorbed by a device, e.g. a second inverter. In this paper, simulation result obtained with a fundamental model of UPFC connected to a simple AC transmission system, and a control system base on "dq" transformation necessary to obtained the P and Q decoupled control ispresented.
14
artículo
The objective of this article is to construct a prototype of a wind turbines with vertical axis type Savonius us-ing materials that are easily accessible and available on the market. Due to the increase in energy demand in Brazil, other sources have been sought for the genera-tion of energy, especially renewable sources since there is an increasing concern for the environment and the attempt to mitigate gas emissions of fossil origin. Wind energy in Brazil has presented an excellent alternative of electric power generation due to the high potential of wind efficiency. The present work aims to construct a prototype of wind turbines of a vertical axis of the type Savonius using materials of easy access and available in the market aiming a low cost in the construction of the same one. Savonius vertical axis aerogenerators are known to be simple, both in terms of construction and operation. ...
15
artículo
The purpose of this article is to analyze how bureaucratic spaces reproduce discourses, showing that, in terms of gender, they do not correspond to innocuous spaces, given that there are normative representations that provide elements of the ideology of domesticity and maternalization of women transmitted through social discourses, supported by representations such as cinema. It is important here to analyze the representation of the secretary in the film The Assistant in order to characterize the specificities that arise from its construction, based on practices related to the (re)presentation of the body-territory and the deployment in the use of public/private space in the protagonist of the film. For this purpose, the Relief Maps tool (Rodó-Zárate, 2013, 2021) is applied, intersecting the categories of gender, age and social class with the places that figure most in the film. It eme...
16
artículo
Mannheim observed the following regarding the "Andean linguistics debate": "On the one hand, 'dualistic' models of society assume that language policy involves intervention in what would otherwise be a sui-genus exchange of allegiances by individuals of one cultural group to another, and that the mere existence of a large and geographically concentrated population of indigenous-speaking people indicates superficial and recent contact between the groups; on the other hand, models of internal colonization assume that the maintenance of the indigenous language for a long time indicates that it is a convenience that provides the opportunity for economic exploitation and political control...
17
artículo
Over time the electric market has been growing with the insertion of several sources, in addition to storage devices, given this panorama, the question arises of how to dispatch the energy generated to meet the demand in a more economical and efficient way. This work presents the implementation of a mathematical model of mixed integer nonlinear programming for the problem of Alternating Current Optimal Power Flow (ACOPF) using the GAMS software. In order to solve the problem of allocation and optimal operation of storage devices in microgrids, as well as the optimal cycle of loading and unloading of this devices in a way to minimize system operational costs. The model observes grid constraints, such as the voltage profile within permissible limits, as well as the intermittency of renewable sources based on wind and solar energy, represented by variable dispatches during the operation. To...
18
artículo
Over time the electric market has been growing with the insertion of several sources, in addition to storage devices, given this panorama, the question arises of how to dispatch the energy generated to meet the demand in a more economical and efficient way. This work presents the implementation of a mathematical model of mixed integer nonlinear programming for the problem of Alternating Current Optimal Power Flow (ACOPF) using the GAMS software. In order to solve the problem of allocation and optimal operation of storage devices in microgrids, as well as the optimal cycle of loading and unloading of this devices in a way to minimize system operational costs. The model observes grid constraints, such as the voltage profile within permissible limits, as well as the intermittency of renewable sources based on wind and solar energy, represented by variable dispatches during the operation. To...
19
artículo
Publicado 2019
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This study shows the results of investigations to determine harmonics in electrical current through the use of Artificial Neural Networks (ANN) using the methods of Feedforward-Backpropagation through a generator of electrical signals in C# (C Sharp). We studied the causes of current harmonics, what a re its implications in everyday work and filters to attenuate these harmonics. For generation of harmonics, we implemented a transmitter of electrical signals by software, also developed in C# (C Sharp) so as to obtain raw and real data as possible, in order to perform tests for simulating errors in the signal power that occur in real time and then process this data.It was determined that the best method for the detection of harmonics using Artificial Neural Networks is Feedforward — Backpropagation with supervised training in order to handle the input and output to get a better result.Th...
20
artículo
Publicado 2008
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In this essay a quick review of the crises of the reforms of the electricity sector in Latin America and particularly in Peru is carried out; the main factors of the same and the ineffectiveness of the Efficient Generation Law are identified, as well as the strong indications of market power. For the Peruvian electricity market –with predominant hydroelectric production and complete liberalization of the spot market– a Nash-Cournot intertemporal equilibrium model is presented, solved as a mixed complementarity problem, which allows a diagnosis of the existence of market power and the application of essential measures. for the adoption of regulatory policies. It also proposes transition measures to competition.
