https://repositorio.ufpb.br/jspui/handle/tede/4457 PPGEE Mon, 06 Apr 2026 22:20:09 GMT 2026-04-06T22:20:09Z http://repositorio.ufpb.br:443/jspui/retrieve/26509/ https://repositorio.ufpb.br/jspui/handle/tede/4457 https://repositorio.ufpb.br/jspui/handle/123456789/37641 Título: Modelagem e acionamento de uma máquina de indução dodecafásica com injeção harmônica para ganho de conjugado eletromagnético Autor(es): Quirino, Marcos Lázaro de Andrade Orientador: Freitas, Isaac Soares de Abstract: The electromagnetic torque can be increased, with significant gain, through the harmonic injection technique. With this procedure, it is possible we use a induction machine with a number of stator phases more than, reducing their dimensions when compared with the three- phase machines, widely used today and easily found on the market. By using multiphase machines we were able to obtain larger conjugates to meet heavier loads, improving the efficiency of certain electromechanical systems, thus taking up less space and increasing the reliability. The present work proposes a mathematical modeling for a twelve-phase induction machine with cage rotor, considering the spatial flow harmonics and the harmonic injection analysis in time. It is presented that using from the fundamental component up to the eleventh harmonic it is possible to produce dc torque, improving the mechanical torque density of a drive system. It is presented the dynamic model of the machine, the steady state analysis and the set of experimental results. Editor: Universidade Federal da Paraíba Tipo: Dissertação Thu, 29 Aug 2019 00:00:00 GMT https://repositorio.ufpb.br/jspui/handle/123456789/37641 2019-08-29T00:00:00Z https://repositorio.ufpb.br/jspui/handle/123456789/37132 Título: Sistema integrado com comunicação LoRa para monitoramento e transmissão de dados em redes e reservatórios de água da CAGEPA Autor(es): Córdula, Márcio Miranda Orientador: Souto, Cícero da Rocha Abstract: Efficient water resource management is one of the greatest challenges faced by sanitation companies in Brazil. This study presents the development and implementation of an integrated system for monitoring and transmitting data in water distribution networks and reservoirs, utilizing Internet of Things (IoT)-based technologies. The research was conducted at the Companhia de Água e Esgotos da Paraíba (CAGEPA) with the objective of reducing water losses, improving operational efficiency, and meeting the targets established by the Legal Framework for Basic Sanitation (Law No. 14,026/2020). The proposed system employs LoRa (Long Range) modules in conjunction with pressure, flow, and level sensors, which are integrated into a SCADA (Supervisory Control and Data Acquisition) platform. This combination enables real-time data transmission over long distances with low power consumption and reduced costs, allowing continuous monitoring even in remote and hardto- reach areas. This project presents a replicable model for other sanitation companies facing similar challenges, standing out for its scalability, energy efficiency, and economic viability. The findings indicate that the integration of IoT, LoRa, and supervisory systems represents a significant advancement in Brazil’s sanitation sector, fostering sustainability, natural resource preservation, and improvements in service quality for the population. Editor: Universidade Federal da Paraíba Tipo: Dissertação Fri, 25 Jul 2025 00:00:00 GMT https://repositorio.ufpb.br/jspui/handle/123456789/37132 2025-07-25T00:00:00Z https://repositorio.ufpb.br/jspui/handle/123456789/36932 Título: Estimação paramétrica da impedância de uma rede elétrica conectada a uma geração fotovoltaica Autor(es): Gomes, Andréia da Silva Orientador: Fernandes, Darlan Alexandria Abstract: Better knowledge of grid impedance is essential to assess stability, improve power quality and control of Distributed Generation Systems (SGDs), as well as perform safe connection or reconnection to the grid grid. As a result of increased network impedance variability, interest in impedance estimation techniques has increased considerably. This work presents a computational method that performs a parametric impedance test on the electrical grid side and online, for a system that contains a photovoltaic generation connected to an electrical grid. The method used in this work requires variations in power injection by the inverter and calculation of network parameters based on numerical analysis on changes in positive sequence phasors extracted from the orientation depth and system currents in the PAC. The numerical search of the network parameters is carried out using classic and recent iterative optimization methods, in order to find a solution for the non-linear search system arising from the technique used. The numerical methods of Newton-Raphson, Broyden, Levemberg-Marquardt, Potra-Pták, Ponto Meio and Chun are used to determine the network parameters and for a subsequent performance comparison between them. A simulation platform containing the entire electrical network together with numerical methods was built in a Simulink/MATLAB® environment to estimate the impedance as the final result of the process. Finally, the results were corroborated with the help of a real-time simulator available in the laboratory Editor: Universidade Federal da Paraíba Tipo: Dissertação Tue, 27 Feb 2024 00:00:00 GMT https://repositorio.ufpb.br/jspui/handle/123456789/36932 2024-02-27T00:00:00Z https://repositorio.ufpb.br/jspui/handle/123456789/36918 Título: Aquisição e processamento de sinais de vibração em redes de distribuição de água para detecção de vazamentos Autor(es): Campos, Diego Perazzo Creazzola Orientador: Souto, Cicero da Rocha Abstract: This work investigates the use of signal processing techniques for leak detection in water distribution pipelines, focusing on the application of the Fast Fourier Transform (FFT) and the Continuous Wavelet Transform (CWT). The study analyzes vibration signals captured by sensors under both leaking and non-leaking operating conditions, aiming to identify characteristic frequency patterns of each situation. The FFT was applied to obtain a global view of the frequency components, while the CWT allowed a detailed time-frequency domain analysis, revealing transient variations associated with leaks. Although the CWT offers a more comprehensive analysis, its application requires greater computational capacity, making the FFT a more viable option for continuous long-term monitoring due to its efficiency. The results show that the combination of FFT and CWT provides a robust solution for leak detection, helping to reduce water losses and promote resource sustainability. This study contributes to the development of more efficient and accurate monitoring systems for the water utility sector. Editor: Universidade Federal da Paraíba Tipo: Dissertação Fri, 25 Jul 2025 00:00:00 GMT https://repositorio.ufpb.br/jspui/handle/123456789/36918 2025-07-25T00:00:00Z