Mestrado em Engenharia Elétrica

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http://repositorio.ufes.br/handle/10/17619

Nível: Mestrado Acadêmico
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Navegando Mestrado em Engenharia Elétrica por Autor "2º membro da banca"

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    Controle parcial de potência em sistemas de energia através de um transformador de estado sólido híbrido
    (Universidade Federal do Espírito Santo, 2024-06-10) Del Piero, Fádua Cozac Gonçalves; Co-orientador1; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador2; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador3; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador4; ID do co-orientador4; Lattes do co-orientador4; Orientador1; https://orcid.org/; http://lattes.cnpq.br/; Orientador2; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; 1º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 2º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 3º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 4º membro da banca; http://lattes.cnpq.br/; 5º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 6º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 7º membro da banca; https://orcid.org/; http://lattes.cnpq.br/
    In recent years, there has been an increasing focus in science on engineering to optimize components and systems, driving advances in semiconductor technology in power electronics. This has enabled the use of higher switching frequencies, reduced volume, and increased efficiency. Within this context, microgrids, which rely on transformers and converters to integrate sources, loads, and systems, are gaining prominence. With the growing adoption of distributed energy sources, especially renewables, the use of efficient converters to control voltage, current, and power flow becomes crucial. However, the limitations of conventional transformers, such as limited voltage control and large volume, restrict system optimization. An alternative is the Solid-State Transformer, which offers advantages such as reactive power compensation, voltage regulation, and reduced size. Despite these benefits, the implementation of the Hybrid Solid State Transformer faces challenges, such as higher cost and lower efficiency. To overcome these difficulties, a hybrid topology is proposed that combines the conventional transformer with the Solid-State Transformer. In this work, a hybrid system was developed that uses the Solid-State Transformer for partial energy control, while the conventional transformer performs most of the transformation. Additional functionalities such as parallel and series active filters, reactive compensator, and dynamic voltage regulator were implemented. The system was analyzed under various load and supply profiles to validate the proposed topology and control, thereby demonstrating the feasibility of the configuration for a real-world situation
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    Projeto fuse sensor para melhora da qualidade da continuidade de energia elétrica a partir da diminuição do indicador DEC
    (Universidade Federal do Espírito Santo, 2024-05-27) Prazeres, Helder Batista de Boa Esperança dos; Co-orientador1; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador2; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador3; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador4; ID do co-orientador4; Lattes do co-orientador4; Orientador1; https://orcid.org/; http://lattes.cnpq.br/; Orientador2; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; 1º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 2º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 3º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 4º membro da banca; http://lattes.cnpq.br/; 5º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 6º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 7º membro da banca; https://orcid.org/; http://lattes.cnpq.br/
    The electrical power distribution systems play a crucial role in social well-being and economic development, providing the foundation for essential services and business sus tainability. However, many components of these systems face technological obsolescence, contributing to power supply failures at critical moments. This situation is further exacer bated in Brazil due to the predominance of bare conductors in its distribution networks and the limited presence of underground networks, making them susceptible to failures caused by external factors. It is observed, however, that these failures in the electrical system can take time to be detected and located, leading to a deterioration in power quality, specifically in the system interruption time, which increases the financial compensation paid by utilities to consumers. To address these challenges, this dissertation presents the Fuse Sensor project, developed in partnership with the company SEVEN (Seven Science Systems Ltda), as an innovative solution incorporating the concepts of Smart Grids and IoT (Internet of Things) technology for the faster location and repair of faults, thus enabling improvements in the efficiency and reliability of electrical systems. The Fuse Sensor is designed to meet the present and future needs of the electrical system, focusing on reducing the SAIDI (System Average Interruption Duration Index), and providing significant gains in compensations. The master’s project approach is structured into three distinct stages: in the first stage, the conception and construction of the Fuse Sensor project are presented, along with the testing procedures; in the second stage, validations of the Fuse Sensor project are conducted, including a comparison of the effectiveness of the communication technologies LoRa, SigFox, and FSK; and finally, in the third stage, an economic analysis is carried out, considering not only the acquisition costs of the innovative equipment but also its economic feasibility for the utilities. By addressing these aspects comprehensively, the Fuse Sensor project aims not only to mitigate the repair time of power supply interruptions but also to promote significant improvements in the quality and reliability of the electrical service. Combining technological innovation and detailed economic analysis, the project seeks not only to meet the current demands of the electrical sector but also to pave the way for a more efficient and sustainable future
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    Sensores de nível de interface água-óleo em fibra óptica baseados em grades de Bragg
    (Universidade Federal do Espírito Santo, 2020-05-27) Ludke, Fabio Giesen; Co-orientador1; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador2; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador3; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador4; ID do co-orientador4; Lattes do co-orientador4; Orientador1; https://orcid.org/; http://lattes.cnpq.br/; Orientador2; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; 1º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 2º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 3º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 4º membro da banca; http://lattes.cnpq.br/; 5º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 6º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 7º membro da banca; https://orcid.org/; http://lattes.cnpq.br/
    This Master Thesis presents the study of fiber Bragg grating (FBG) sensors applied in the measurement of water and oil interface level. Using industrial rubber diaphragms, which has a fiber Bragg grating installed inside, it is possible to measure the level of interface water-oil. The measurement is performed by monitoring the pressure change on each diaphragm caused by the variation in the interface level. The FBG sensors are non-conductive, resistant to electromagnetic interference (EMI) and they are intrinsically safe to be installed in explosive environments. Techniques of FBG inscription known as phase mask and plane-by-plane have been used to manufacture the fiber sensors. Using a spectrometer, the coupled light propagating through the fiber sensor can be interrogated. The analyzes are performed searching for the central wavelength for each FBG used. The stress on the FBG causes a shift in the central wavelength proportional to the level of the interface between the different fluids, for example water and oil. Thus, as water and oil have different densities and depending on the amount of material that is inside the tank, the diaphragms with FBG undergoing higher or lower deformation and causing a proportional wavelength shift variation of the FBG peak. The main materials used in the production of the FBG sensors are silica optical fiber, thermoplastic polyurethane and nitrile rubber. Nitrile rubber corrosion resistant, including use in the oil industry. A methodology was developed for production of FBG sensors with diaphragms printed on the 3D printer and using the nitrile rubber vulcanization. The sensor developed through the vulcanization of nitrile diaphragms with FBG inside was produced using a press system with temperature control. The influence caused by the variation in the diaphragm thickness is observed in the tests with diaphragms produced on 3D printer. This variation doesn’t change the linearity of the system, but change its sensitivity. The measured sensitivities were 7.5 pm/kPa and 5.2 pm/kPa for the diaphragm of 1.2 mm and 2 mm, respectively. The operating range of this interface level sensor varies from 0 to 78 cm. The resolution of the system is approximately 0.01 cm. For interface levels ranging from 0 cm to 78 cm, the standard deviation varied from 0.13 to 0.28, respectively. The average differences calculated for interface levels varying between 0 cm and 78 cm, resulted in standard deviation ranging from 1.09 to 0.43, respectively. It was possible to identify the oil and water interface level in the tests with nitrile diaphragms. As a result, an equation was obtained, where it is possible to determine the interface level through the diaphragm deformation, showing this system has potentiallity to evolve to a product in the near future