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Navegando EMC - Trabalhos de Conclusão de Curso por curso "Engenharia Elétrica (RMG)"
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Item Análise do fator de potência em instalações elétricas contendo geração solar fotovoltaica(Universidade Federal de Goiás, 2023-07-21) Rezende, Gabriel Portella; Dias, Dayanne Ferreira; Oliveira, Janine Cavalcante de; Belchior, Fernando Nunes; Castro, Marcelo Stehling; Belchior, Fernando Nunes; Santos, Josephy Dias; Oliveira, Janine Cavalcante deThe main objective of this study is to analyze the power factor in electrical installations that incorporate solar photovoltaic generation systems. Distributed generation of electricity through photovoltaic systems has gained increasing importance due to its capacity to produce clean and renewable energy. However, the integration of these systems into existing electrical grids can present challenges, such as the impact on the power factor. Therefore, this study proposes a detailed examination of the effects of generation on the power factor in electrical installations. For this, measurements and analyses will be conducted at the Centro de Aulas das Engenharias building during November 2022 to obtain concrete data and support the study's conclusions. The expected results of this work will contribute to a better understanding of the effects of photovoltaic systems on the power factor and provide guidelines for the design and operation of electrical installations that include solar generation. This aims to optimize the use of electricity, reduce losses, and increase the energy efficiency of these installations.Item Análise modal estática aplicada ao problema de fluxo de carga em coordenada retangular para avaliação de estabilidade de tensão(Universidade Federal de Goiás, 2024-02-02) Sena, Katarina Leite de; Santos, Vinícius Morais Calixto dos; Brigatto, Gelson; Kopcak, Igor; Kopcak, Igor; Alves, Antônio César Baleeiro; Garcés Negrete, Lina PaolaA voltage instability is a phenomenon directly linked to the inability of an electrical power system to meet its demand for active power, caused by inadequate reactive power support. Traditionally, voltage stability margins are calculated through static methods based on the load flow problem. Additionally, Static Modal Analysis has been a tool foridentifying critical buses or areas regarding voltage stability. This methodology uses the representation of voltage phasors in cylindrical or polar coordinates. In contrast, this study proposes applying Static Modal Analysis to the Jacobian of Load Flow in Rectangular Coordinates, where voltage phasors are represented by their Cartesian coordinates on the real and imaginary axes. The aim was to assess whether this new approach could provide additional qualitative information for identifying critical buses regarding voltage stability, complementing traditional Static Modal Analysis. For the analysis of results, well-known transmission networks from the literature were employed, and for comparing the performance of the methods developed in this study, Static Modal Analysis in polar coordinates was adopted as a reference. The results obtained demonstrate that the method developed in this study is satisfactory, as the provided voltage stability margins are close to those of the traditional method, and the Static Modal Analysis applied to Rectangular Load Flow classified the critical buses of the tested systems correctly.Item Atualização de planta de instalação elétrica industrial(Universidade Federal de Goiás, 2024-02-02) Araujo, Vitor Montero; Araujo, Bruno Alves de; Alvarenga, Bernardo Pinheiro de; Alvarenga, Bernardo Pinheiro de; Santos, Euler Bueno dos; Paula, Geyverson Teixeira deAll elements of a building undergo changes over the years, to a greater or lesser extent, the original characteristics are altered and not recorded, making it difficult to understand for those who did not participate in the processes. This is especially complex for electrical installations, as the addition of new equipment, jobs, and other changes bring problems that can lead to accidents, such as an increase in load beyond what the circuit was designed to handle, generating excessive heating. Renovating a building is a great time for all these issues to be resolved. This is the case of Mercabox Araujo, a supermarket company that is undergoing an expansion that will double its area, a situation that requires the renewal of its entire electrical installation to support the new installed power and a new layout to meet future activities. This final project aims to propose the design of the new Mercabox Araujo installations, taking into account the customer's demands and compliance with the standards that govern low voltage installations, ensuring reliability and safety. Furthermore, a step-by-step guide was also proposed so that the transition between the old and new installation does not cause disruption to the company's activities, which will continue to operate during the works.Item Estudo de viabilidade de implementação de pontos de recarga de veículos elétricos em condomínio residencial(Universidade Federal de Goiás, 2024-01-17) Santos Neto, João Victor; Santos, Thales Moreira; Paula, Geyverson Teixeira de; Paula, Geyverson Teixeira de; Garcés Negrete, Lina Paola; Lima, Wilmar Alves CruvinelOver the past 13 years, we have observed a steady increase in the number of electric vehicles circulating in Brazil. This scenario presents a significant challenge for buildings to meet the demand of residents. This study aims to analyze the feasibility of demand for the implementation of electric vehicle charging stations in established residential condominiums. To achieve this, a case study was conducted in a high-end building in Goiânia, where a device called an energy analyzer was used for data collection. A crucial point for the study was the analysis of projected and calculated demands. The study results included the implementation of up to 4 semi-fast charging station points (22kW) and a simulation of load increase, along with the transformer replacement for a future adaptation of the building to serve the entire condominium. NT-042 and NT-02 were used for the transformer calculation.Item Integração de usinas solares fotovoltaicas e eólicas de grande porte em sistemas de transmissão de energia elétrica(Universidade Federal de Goiás, 2023-08-22) Rasteli, João Gabriel Teixeira; Garcés Negrete, Lina Paola; Garcés Negrete, Lina Paola; Silva, Fernando Carvalho Assunção da; Kopcak, IgorAbstract—This article addresses the assessment of the impacts of integrating large-scale photovoltaic and wind power plants into the electric transmission network. To accomplish this, computer simulations based on the Monte Carlo Method were conducted. The simulations consider the probabilistic variation of the primary resource of the energy sources, solar irradiance, and wind speeds, in order to calculate the output powers of the plants. Three power electrical systems found in technical literature were analyzed: Chesf Simplified 5-bus, IEEE 9-bus, and IEEE 14- bus. For each simulated system, the average values of energy losses, voltage levels, as well as the average values of generation from renewable plants are obtained and analyzed. The results demonstrated that the additional generation from the plants can reduce the total active energy losses in the system, especially when they are located close to the loads, thus avoiding the transmission of energy over long distances. However, for one of the tested systems, an increase in average active energy losses was observed, which may be due to the consequential effects of reverse power flow in the branches connecting the allocation bars of the plants, which were randomly selected. The voltages at the bars were also evaluated, showing an increase in maximum voltages, but within recommended limits. Therefore, it is concluded that the integration of large renewable plants into transmission systems requires careful planning involving optimization techniques for their allocation and sizing, in such a way as to avoid undesirable impacts on the electrical system.Item Métodos DLF e MSP retangular com modelo de carga ZIP: formulações, testes e comparações(Universidade Federal de Goiás, 2023-08-18) Mattar, João Vitor Oliveira; Kanashiro, Mauricio Kenichi; Brigatto, Gelson Antônio Andrêa; Brigatto, Gelson Antônio Andrêa; Garcés Negrete , Lina Paola; Kopcak, IgorThe modeling of electrical systems normally considers the load data as independent of the bus voltages, such that loads are modeled as constant power and classic methods of solving subsystem 1 of the load flow problem are based on this consideration. However, the constant power model may not satisfactorily represent the behavior of different loads, as this consideration is more appropriate in case that the bus voltages remain equal to their respective nominal values. Despite this, in the need for a more comprehensive approach to the behavior of the loads of the electrical network under study, the ZIP model can be adopted to represent loads as dependent on the module of the bus voltages, which makes it necessary to adapt solution methods to consider the ZIP payload model. This work aims to develop the formulation of two solution methods for subsystem 1 of distribution networks considering the ZIP load model: the direct load flow method and power sum method in rectangular version. For analysis of results, distribution networks known from literature were used and, for the performance comparison of the methods developed in this work, the power sum method was adopted in the version in polar coordinates with ZIP load model. The analysis of the results show that the performance of the formulations developed in this work are similar to the polar power sum method in terms of the number of iterations, but are inferior in terms of processing time of the final solution.Item Proposta de projeto e estimativa de regimes de operação de sistema fotovoltaico isolado para suprimento de cargas auxiliares em subestação de transmissão de energia elétrica(Universidade Federal de Goiás, 2023-08-21) Barros, João Vitor Menezes Carvalho; Correa, Vitor Hugo Castilho; Marra, Enes Gonçalves; Pimentel , Sérgio Pires; Pimentel, Sérgio Pires; Marra, Enes Gonçalves; Bousquet, Marcelo Nogueira; Nerys, José Wilson LimaThis study is based on the dimensioning of an isolated photovoltaic system (SFV) for the supply of energy to feed loads of auxiliary services of a substation as the main scope to be achieved for the work. In order to reach the desired objective, as a methodology, a case study was carried out in a substation in the municipality of Trindade, in the State of Goiás. In order to guarantee the supply of energy to the auxiliary loads for a longer period of time, the design of an energy storage system based on lead-acid batteries. As a result, it was possible to observe that the implementation of the photovoltaic system guarantees an additional source of redundancy to feed the auxiliary loads, contributing to the continuous operation of the substation protection and operation system.Item Sistema de aquisição de dados de baixo custo utilizando Arduino(Universidade Federal de Goiás, 2023-08-16) Caixeta, Eduardo Martins de Carvalho; Carvalho, José Humberto Ferreira Ramos; Cardoso, Alisson Assis; Cardoso, Alisson Assis; Souza, Gustavo Souto de Sá e; Nerys, José Wilson LimaCurrently, most residential appliances have electrical devices that have well-defined properties. These are the scope of study of countless electrical engineering students. Even if these devices are easy to handle, the studies of the systems and devices that compose them require an in-depth analysis, and to carry out this analysis the use of measuring instruments is essential. Some of these devices are known, such as the multimeter, voltmeter, ammeter and oscilloscope. These devices are very ef icient and have a range of utilities, as well as being very precise, showing the indication of one or more characteristic parameters, such as ef ective value, peak value and frequency of magnitudes such as voltage and current. Therefore, it is clear that the oscilloscope’s acquisitiont is mandatory for engineering students, so this document presents the operating principles of the oscilloscope and a basic model made with the use of common software and devices frequent in laboratories and research rooms. of engineering schools. Furthermore, the development of this oscilloscope is intended to collaborat with the practice of research and study in the laboratory.