Mestrado em Engenharia Elétrica
URI Permanente para esta coleção
Nível: Mestrado Acadêmico
Ano de início:
Conceito atual na CAPES:
Ato normativo:
Periodicidade de seleção:
Área(s) de concentração:
Url do curso:
Navegar
Submissões Recentes
- ItemAplicação da técnica Motor Current Signature Analysis (MCSA) em motores de uma mesa de resfriamento de rolos(Universidade Federal do Espírito Santo, 2024-09-10) Chagas, Rafael Mariano; Santos, Walbermark Marques dos ; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; Rocha, Helder Roberto de Oliveira ; Encarnação, Lucas Frizera ; Barcelos, Silvangela Lilian da Silva Lima ; Nascimento, Thais Pedruzzi doElectric current signature analysis (ESA) has been widely used as a solution for projects to improve operational reliability in industries, since there are many studies that prove its effectiveness. The variability of ESA conditions is a set of techniques capable of detecting failures by reading electrical signals collected remotely. According to Bonaldi et al (2007), among the techniques that make up ESA, the MCSA (Motor Current Signature Analysis) technique is the most widely used technique in the industrial sector and stands out for its comprehensiveness and simplicity, since it only requires the analysis of the machine's current spectrum signal to detect abnormal conditions. In the search for better industrial development, the study of techniques that improve equipment availability is of utmost importance. Within this context, this dissertation aims to study the applicability of using this technique to improve the reliability of a roller table, with 264 electric motors installed in the process in a sequential manner, where any failure in one of these pieces of equipment impacts the entire process. These motors are driven by frequency inverters and this type of drive can pollute the MCSA response and therefore the problem will also be discussed. The results presented in this dissertation show that the fault detection technique works, even with all the practical realities encountered in the actual implementation of equipment
- ItemComportamento da proteção de sobrecorrente em redes com geração distribuída operando em ilhamento intencional(Universidade Federal do Espírito Santo, 2024-08-23) Paula, Toribio Cruvinel de; Simonetti, Domingos Sávio Lyrio ; https://orcid.org/0000-0001-5920-2932; http://lattes.cnpq.br/1107005171102255; https://orcid.org/0009-0002-2261-8517; http://lattes.cnpq.br/8073441410217732; Rueda Medina, Augusto César ; https://orcid.org/0000-0002-4291-3153; http://lattes.cnpq.br/7397584412509839; Có, Márcio Almeida ; https://orcid.org/0009-0001-6026-0125; http://lattes.cnpq.br/9674164201696461Distributed generation (DG) has become a fundamental part of the modern electrical system, especially with the increasing adoption of renewable energy sources such as solar and wind. However, the integration of DG presents significant challenges for the protection of distribution systems, particularly in islanding situations, where the isolated operation of microgrids can compromise the coordination of protection devices. Despite advancements in protection technology, there are still gaps in understanding how DG affects the coordination of overcurrent protections, resulting in operational failures and safety risks. Existing automated solutions have not proven to be sufficiently effective in addressing the complexities introduced by DG, especially in islanded operation scenarios. This work proposes a detailed analysis of the impacts of islanding in microgrids with GDFV from the perspective of overcurrent protection. The methodology involves simulations in a representative environment that incorporates industrial loads and photovoltaic generation, using MATLAB/Simulink software to model the behavior of protection devices under different operating conditions. The results indicate that the integration of distributed photovoltaic generation requires a reassessment and adjustment of existing protection systems to ensure the continuity and safety of distribution network operations. The implementation of adaptive technologies and the strategic use of new protection functions are essential to address the challenges posed by this new energy configuration
- ItemMonitoramento de desempenho e ressintonia de controladores PID baseado em dados para malhas em cascata a partir de variações na referência ou na entrada de controle(Universidade Federal do Espírito Santo, 2024-11-05) Pimentel, Matheus Rangel; Munaro, Celso José ; https://orcid.org/0000-0002-2297-7395; http://lattes.cnpq.br/5929530967371970; Campestrini, Lucíola ; Garcia, ClaudioThis dissertation explores a data-driven methodology for monitoring and retuning PID controllers in cascaded control loops. The methodology uses data collected from a closed loop process to evaluate the performance of inner and outer loops. The study focuses on two approaches: monitoring based on changes in outer loop reference signal and monitoring based on changes in outer loop control input. The methodology employs an Exponentially Weighted Moving Average (EWMA) control chart using a statistic derived from the Integral of Absolute Error (IAE) to detect poor performance. If poor performance is detected, the Optimal Controller Identification (OCI) tuning method, based on prediction error, is employed to retuning the inner and outer controller gains. The monitoring and retuning steps are performed exclusively using closed-loop data, and statistical tests are performed to demonstrate that both steps were successful. The methodology is applied to a pilot plant, where the cascade control configuration is used for the level (outer) and flow (inner) loops. As shown, the proposed methodology can be applied even in the presence of very noisy signals, without assumptions about the tuning method used for the driver design. The dissertation is structured in six chapters, covering topics such as performance monitoring, data-driven driver design, a methodology proposal and its application to a pilot plant, culminating in discussion and conclusions on the topic addressed.
- ItemEstudo da viabilidade técnico-econômica preliminar de um sistema térmico híbrido PTC-RSU para a geração de energia elétrica no Estado do Espírito Santo(Universidade Federal do Espírito Santo, 2024-06-27) Sant’Ana, Brunella Bermudes Prati; Santos, José Joaquim Conceição Soares ; Fardin, Jussara Farias ; Rocha, Helder Roberto de Oliveira; Faria, Pedro Rosseto deThe growing concern about rising global temperatures has sparked debate in various sectors of society. In the context of electricity generation, the transition to more sustaina ble energy sources is becoming an urgent necessity, given the importance of electricity in all spheres of modern life. This study aims to analyze the technical and economic feasibi lity of implementing a thermosolar-biomass plant in the state of Espírito Santo, with the aim of providing a clean and sustainable source of energy for both the state and the regio nal distribution network. The proposed system consists of a combination of technologies, including a solar generation plant with parabolic trough collectors (PTC) together with the combustion of locally generated Municipal Solid Waste (MSW) in order to mitigate the intermittency of the solar source. The methodological approach of the research pre sented involves localization studies using road routes for transporting the MSW, research into solar irradiation in the location of the plant, simulations using IPSEPro software to thermodynamically analyze the plant and determine electricity generation, as well as preliminary economic feasibility studies, considering basic investment costs and return. The results of the research indicate that it is possible to achieve a generation capacity of between 28MW and 78MW of gross electrical power, depending on the configuration of the hybrid plant. For maximum electricity generation, the plant’s solar field is made up of 88 collectors, each 1.50 meters long, installed over an area of approximately 7.2 hectares. To guarantee continuous energy generation, it was estimated that a logistical quantity of 27.04kg/s of MSW could be delivered to the site identified in the studies as ideal for installing the plant, located in Cariacica, where the waste is incinerated and the heat from combustion is used to heat the solar field fluid at night. Economically, the project has a maximum initial investment of around R$522,000,000.00, with a return of up to 7 years (considering attenuation scenario of 60% of revenue), which demonstrates the viability of the project. However, an initial investment of this size is only feasible with the support of public policies to encourage the use of renewable sources and low interest rates for financing. The investment and development of this hybrid power plant initiative represents a significant step forward in the state’s renewable energy sector, contributing to the reduction of greenhouse gas emissions and the diversification of the regional electricity matrix
- ItemPerformance 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 bancaThe 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