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 "3º membro da banca"

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    Performance evaluation of a 5G-based hybrid visible light and radio frequency communication system
    (Universidade Federal do Espírito Santo, 2024-04-15) Peterle, Augusto Cesar Federici; Rocha, Helder Roberto de Oliveira ; Silva, Jair Adriano Lima ; https://orcid.org/; http://lattes.cnpq.br/; Segatto, Marcelo Eduardo Vieira; Pohl, Alexandre de Almeida Prado; 3º membro da banca
    The development of 5G is an ongoing process and annually release are published by 3GPP considering fundamental aspects such as network’s physical layer, numerology, bandwidth, modulation, among others. For new releases, a rapid prototyping is valuable for experimental demonstrations and proof-of-concepts. The usage of the Software-Defined Radio (SDR) technology is advantageous as it allows the implementation of modulation and demodulation procedures in software, enabling performance evaluations in various physical mediums, for instance both optical and Radio Frequency (RF). Besides the prototyping need, the growing congestion and limitation of the RF spectrum have led to exploring alternative communication mediums. Visible Light Communication (VLC) technology has emerged as a solution, utilizing an unlicensed optical spectrum without substantial communication competition. The rise in popularity of Light Emitting Diodes (LEDs) for residential and commercial lighting supports this idea, as LEDs can be controlled and employed as information transmitters and its low power consumption. To this aim, studies regarding optical communication and Orthogonal Frequency Division Multiplexing (OFDM), as well as an in-depth explanation of 5G New Radio (NR) numerol ogy were conducted. Therefore, a prototype was prepared and assembled for 5G NR signals generation for downlink via VLC, and for uplink via RF. The experimental results indicated that the coding techniques outlined by 5G NR integrate well with VLC, enabling the use of modulation levels up to 64-QAM. This outcome facilitated error-resistant communication for the transmitted data volume, showcasing a robust hybrid VLC/RF system capable of successfully supports relatively high data rates
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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; Orientador1; https://orcid.org/; http://lattes.cnpq.br/; 1º membro da banca; 2º membro da banca; 3º membro da banca
    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