EMC - Trabalhos de Conclusão de Curso

URI Permanente para esta coleçãohttp://200.137.215.59//handle/ri/1309

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Agora exibindo 1 - 20 de 181

Aplicabilidade da manufatura aditiva por deposição a arco (MADA) por CMT para produção de flange de aço para conexão de descarga de caminhão tanque de cloro de estação de tratamento de água
(Universidade Federal de Goiás, 2025-12-08) Rodrigues, João Gabriel Nunes; Silva, Lucas Lauriano da; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Silva, Gustavo Pereira da; Souza, Daniel; Silva, Lucas Lauriano da
Components used in water treatment plants operate in potentially corrosive environments, which can lead to deterioration and failure. Therefore, the exploration of manufacturing processes capable of producing more effective components is becoming increasingly necessary. In this context, this study evaluated the applicability of Wire Arc Additive Manufacturing (WAAM), using the Cold Metal Transfer (CMT) process, for the production of a flanged pipe intended for unloading a chlorine tanker truck. Initially, flanges were manufactured with different bead spacings, and the influence of the shielding gas flow rate on pore formation was analyzed. Subsequently, the final flange and a pipe were produced for mechanical and corrosion testing, as well as microstructural analysis; results were compared with a WAAM-GMAW component and a conventional pipe. The results showed that the flange with a 12 mm spacing exhibited better geometric integrity, while a flow rate of 20 L/min was the minimum required to prevent internal porosity. Microstructural analysis identified ferrite and pearlite in the lower and central regions, in addition to widmanstätten ferrite in the upper region. The manufactured pipe demonstrated superior yield strength and tensile strength compared to those obtained via WAAM-GMAW. In corrosion tests, samples produced by CMT exhibited higher resistance compared to both the conventional pipe and the WAAM-GMAW samples. It is concluded that the CMT process is a suitable alternative for manufacturing components intended for corrosive environments.
Desenvolvimento de uma aplicação IoT para bancada didática de eletropneumática
(Universidade Federal de Goiás, 2025-12-10) Araújo, Gabriel Latalisa Fernandes de; Fonseca, João Paulo da Silva; Fonseca, João Paulo da Silva; Souza, Gustavo Souto de Sá e; Costa, Gabriel Alves
The evolution of Industry 4.0 and the Industrial Internet of Things (IIoT) has transformed manufacturing and educational environments, demanding efficient, flexible, and accessible connectivity solutions. In this context, the Message Queuing Telemetry Transport (MQTT) protocol stands out as a fundamental tool for enabling real-time communication with low bandwidth consumption between different devices. This work presents the development of a web server for the remote control and monitoring of an electropneumatic test bench, aiming at the modernization of laboratory practices in the Hydraulic and Pneumatic Drive Systems course. The system architecture is composed of a NodeMCU ESP8266 development board, responsible for valve actuation and sensor reading on the bench; a Raspberry Pi single-board computer, acting as the central server hosting the application developed in Python (Flask) and the MQTT broker; and a responsive graphical interface that allows operation in manual and sequential modes. The obtained results validate the application of open hardware technologies and protocols in the creation of robust educational tools, demonstrating the technical feasibility of remote control and monitoring via a communication network.
Análise de resistência mecânica de elementos roscados fabricados em PLA pelo processo de impressão 3D considerando diferentes tipos de preenchimentos
(Universidade Federal de Goiás, 2025-06-03) Vieira Filho, Túlio Teles; Cunha, Daniel Fernandes da; Cunha, Daniel Fernandes da; Figueiredo, Kléber Mendes de; Oliveira, Ademyr Gonçalves de
Additive manufacturing, or 3D printing, has established itself as one of the most promising technologies for component production across various industries, such as automotive, biomedical, and aerospace. This technique enables the creation of complex geometries, cost reduction, and customization of parts with speed and precision. Among the most commonly used materials, polylactic acid (PLA) stands out as a biodegradable, affordable, and easily processed polymer, widely employed in prototyping and functional component manufacturing. However, the mechanical strength of PLA-printed parts is strongly influenced by factors such as the type and density of internal infill. This is particularly relevant for threaded elements, extensively used in mechanical assemblies for fixation and connection. Analyzing how different infill patterns affect the mechanical strength of these elements is essential to ensure the safety and structural integrity of projects utilizing 3D printing. This study aims to evaluate the mechanical strength of threaded elements manufactured in PLA using 3D printing, considering different infill patterns and densities. Prototypes will be developed, and experimental tests will be conducted, including tensile, compression, and torque tests, to investigate the influence of these variables on the mechanical behavior of the elements. The results will address gaps in the scientific literature, contributing to the efficient use of PLA in engineering projects and providing practical recommendations for industry applications.
Avaliação da eficiência dos sistemas de ventilação local exaustora em laboratórios de ensino de química: diagnóstico e propostas de melhoria
(Universidade Federal de Goiás, 2025-06-16) Borba, Rafaela Benhur de; Colvero, Diogo Appel; Cunha, Daniel Fernandes da; Cunha, Daniel Fernandes da; Colvero, Diogo Appel; Vilela, Carlos Alberto de Almeida
The installation of a Local Exhaust Ventilation System (LEV) is essential in environments where equipment is found that emits contaminants or products that release substances that are harmful to the health of workers who frequent the location. For this reason, chemistry laboratories require exhaust hoods that capture pollutants and eliminate them, through piping and a fan, before they are dispersed throughout the room. Therefore, pointing out this need, the technician of higher education undergraduate laboratories that handle chemical products recommended that the LEV of these locations be analyzed and checked for possible failures. The aim, then, was to increase the safety of researchers, students and professors who work there and reduce environmental impacts. Therefore, two visits were made to the laboratories, with the help of the responsible technician, to collect information and measurements, in addition to studying proposals for relevant solutions that meet a LEV and using equations to calculate the pressure and flow rate required by the system to select the ideal exhaust fan, correctly achieving the objective. Thus, to solve the faults present in the system of these studied locations, two options for dimensioning the three installed hoods were suggested. One of these solutions would be a single pipe connected to the three hoods with diameter reducers in the hoods furthest from the exhaust fan, having to be connected at the same time for any of them to be used. The other solution would be for each hood to have its own pipe and for all three to have the same duct diameter, allowing for less noise, since each one would be connected separately. In addition, to solve other perceived problems, some solutions were proposed: in order to avoid fire and eliminate internal wires in the hoods, on/off buttons were required on the outside of them; for the lack of sealing at the base of the hoods, silicone was required around their entire perimeter; to prevent animals, insects, rain and hail from entering the pipes, Chinese hats and screens were added at the end of each duct; and to the presence of high noise, the exhaust fans were installed outside the laboratories.
Concepção de sistema de alimentação para protótipo de máquina de quebrar endocarpo de baru
(Universidade Federal de Goiás, 2025-07-02) Morais, Ítalo Felipe Lira de; Girardi, Anderson Gomes; Kitatani Júnior, Sigeo; Kitatani Júnior, Sigeo; Nerys, José Wilson Lima; Oliveira, Ademyr Gonçalves de
The focus of this work is to contribute to the development of a machine for breaking the endocarp of the baru fruit (Dipteryx alata). The process of breaking this fruit to obtain its kernel limits and hinders its commercial exploitation, which in turn discourages the study of its potential — both in the food industry and in other areas such as medicine, where active ingredients of natural origin are used. The mechanization of baru, a fruit of high value for family farming in the Cerrado, faces as its main obstacle the design of an efficient feeding system, due to the high morphological variability and the level of force required to break its endocarp. This work aimed to develop the conception of a feeding system for a prototype of a baru cracking machine, using a systematic and iterative design approach. The methodology was structured into two development cycles. The first cycle experimentally investigated a gravity batch feeding system, concluding that this approach is unfeasible due to the severe arching phenomenon, which causes recurring flow blockages. Based on this learning, a second cycle was initiated, focusing on the generation of concepts for continuous feeding. Through the application of the Analytic Hierarchy Process (AHP) multicriteria decision-making method, which prioritized criteria such as Manufacturing Cost, Robustness, and Ease of Maintenance, the Belt Conveyor with Lugs design was selected as the most promising. The main contribution of this study lies in the generation of empirical knowledge about the flow behavior of baru and the application of a structured engineering methodology to propose a technically viable and justified solution aligned with the needs of small producers.
Desenvolvimento de um sistema IOT de baixo custo para monitoramento de grandezas elétricas e sua aplicação em usinas fotovoltaicas
(Universidade Federal de Goiás, 2025-12-11) Souza Filho, Sérgio Lima de; Azenha, Gefferson Martins de; Nerys, José Wilson Lima; Cardoso, Alisson Assis; Souza, Gustavo Souto de Sá e; Nerys, José Wilson Lima
This work presents the development and validation of an Internet of Things (IoT)-based monitoring system applied to a medium-sized photovoltaic power plant. The proposed solution aims to provide a low-cost, flexible, and independent alternative to the native monitoring platforms embedded in inverters, which often limit data access, customization of indicators, and the depth of performance analysis. The system was implemented using an ESP32 microcontroller as the acquisition device, performing readings through the Modbus TCP protocol and transmitting the collected measurements to the cloud via MQTT. The data were stored in a database and visualized through a dashboard developed in Power BI. To validate the system, a case study was conducted at the UFV 05 – Solar Power – Oeste plant, located in Teresópolis, Goiás, composed of three Sungrow SG333HX inverters and 1,944 photovoltaic modules. The practical application demonstrated that the system was able to continuously collect, process, and transmit operational data, enabling instant, daily, and monthly generation analyses. The results obtained were consistent with the expected performance of the plant, confirming the accuracy of the readings and the stability of the solution under real operating conditions. In addition to the technical validation, an economic feasibility analysis was performed, highlighting the low cost of the proposed system — approximately R$ 30.00 initial investment plus R$ 30.00 per month for infrastructure — compared to commercial monitoring solutions, which can exceed R$ 250.00 per asset per month or R$ 1,500.00 per month in specialized platforms. This cost difference reinforces the potential of the solution to expand monitoring capabilities in small and medium-sized photovoltaic plants, democratizing access to advanced supervision tools. The results demonstrate that the developed IoT solution is technically feasible, economically advantageous, and suitable for real distributed generation contexts, offering a robust and scalable alternative for monitoring the performance of photovoltaic power plants.
Análise da aplicação de cabos de alto desempenho em linhas de transmissão
(Universidade Federal de Goiás, 2025-12-02) Oliveira, Leonardo Araújo de; Lima Neto, Nilson Lucas de; Kopcak, Igor; Garces Negrete, Lina Paola; Brigatto, Gelson Antônio Andrêa; Kopcak, Igor
This work presents a comparative analysis of technical performance and resource optimization between the use of conventional conductors (ACSR) and high-performance conductors (ACCC) in overhead transmission lines, modeled using PLS-CADD and ATPDraw software. The study discusses how the increasing demand for energy and socio-environmental constraints for the construction of new corridors drive the need to optimize infrastructure, overcoming the thermomechanical limitations of traditional cables. The main impacts of technological replacement are addressed, such as the reduction of sag at high temperatures, the increase in power transmission capacity, and the consequent reduction in steel demand for support structures. The methodology is based on the simulation of a real 230 kV Transmission Line route, evaluating two different tension scenarios to determine the optimal tower spotting. The results obtained evidence that the use of the ACCC cable allowed doubling the transmission capacity and reducing the total weight of metallic structures by about 10%, demonstrating a lower ratio of structural steel weight per MVA of maximum transmissible power. The work contributes to the understanding of the physical advantages of high-performance cable technology, providing a quantitative basis for transmission network expansion and existing line uprating projects that seek to maximize the use of transmission assets in the face of increasing demand and the need to expand energy flow capacity.
Formulação por balanço de correntes de barra para a solução do problema do fluxo de carga de redes de distribuição
(Universidade Federal de Goiás, 2025-12-03) Martins, Thácio Breno Silva; Brigatto, Gelson Antônio Andrêa; Brigatto, Gelson Antônio Andrêa; Garcés Negrete, Lina Paola; Kopcak, Igor
The classic formulation of the Load Flow Problem is based on calculating the power balance of buses in the electrical system under study and relies on obtaining the roots of residual power equations, whose solution needs to be obtained by iterative methods due to the non-linear nature of the equations. This Final Course Project aims to develop an alternative formulation for solving the Load Flow Problem of distribution networks, based on calculating the bus current balance and its solution by the Newton-Raphson Method based on obtaining the roots of residual current equations. The number of iterations and processing times are adopted as computational performance criteria for evaluating the developed formulation and comparing it with the classic Newton-Raphson method by power balance and the Sum of Currents, Sum of Powers, and Direct Load Flow methods. Distribution networks known from the literature are employed as test systems for evaluating and comparing performance based on normal operation and the limiting situation of system stability loss.
Painel de visualização e análise de dados de consumo de energia elétrica no prédio da Faculdade de Ciências e Tecnologia, utilizando o PowerBI
(Universidade Federal de Goiás, 2025-12-09) Oliveira Filho, Rodrigo Metello de; Castro, Marcelo Stehling de; Belchior, Fernando Nunes; Oliveira, Antonio Melo de; Castro, Marcelo Stehling de; Santos, Josephy Dias; Belchior, Fernando Nunes
Efficient electricity management in public institutions is essential for cost reduction and promoting sustainability. This work presents the development of a data visualization and analysis dashboard for electricity consumption at the Faculty of Science and Technology (FCT)of the Federal University of Goiás (UFG), using Microsoft Power BI. The study began with the installation of electrical parameter meters and followed a structured methodology of data extraction, transformation, and loading (ETL). A comparative analysis was performed between the obtained measurements and the invoices issued by the utility company, in addition to checking quality indicators and load profiles. The results allowed for the identification of consumption patterns associated with academic routines and validated the effectiveness of air conditioning shutdown policies. A predominantly capacitive power factor behavior was diagnosed, indicating the need for adjustments in the capacitor bank, and reading inconsistencies were detected during power interruption periods. The developed tool proved to be effective for continuous monitoring, supporting decision-making and modernizing the energy management of the unit.
Mitigação de ruídos em placa controladora de motores do projeto SSL do núcleo de robótica Pequi Mecânico
(Universidade Federal de Goiás, 2025-11-28) Elizondo, Rodolfo Cordeiro Magalhães; Paula, Geyverson Teixeira de; Paula, Geyverson Teixeira de; Lemos, Rodrigo Pinto; Melo, Fernando Ferreira de
This work aims to mitigate noise on Motor Driver ICs due to lack of optimization in the ground plane layout by not separating effectively the power related components from logic components which operate in high frequencies, damaging the ideal operation of the circuit. Due to this being a switch-mode application, where power is quickly activated and deactivated, it will cause a lot of noise on the ground plane that will affect the logic components of the board. In this work the current motor control board from the project SSL from Núcleo de Robótica Pequi Mecânico will be analyzed, point out the presence of noise on the AGND pin of the chip A3930, show optimizations that promises to eliminate great part of the noise existent.
Dispositivo de telemetria e monitoramento de carga e condição de bateria para e-scooter
(Universidade Federal de Goiás, 2025-11-28) Oliveira, Victor Paulo Ribeiro de; Paula, Geyverson Teixeira de; Paula, Geyverson Teixeira de; Melo, Fernando Ferreira de; Kopcak, Igor
Electric micromobility has emerged as a sustainable alternative in urban areas, offering versatility in transportation. However, the premature degradation of lowcapacity batteries compromises vehicle lifespan and reliability. This work presents the development of a telemetry device based on the ESP32 microcontroller, designed to monitor the charge and health status of e-scooter batteries. The system measures voltage and current using dedicated sensors and transmits the data in real time via Bluetooth to a mobile device. The proposed solution enables continuous monitoring of battery conditions, supporting preventive maintenance and extending battery life. Therefore, the device enhances the reliability of electric micromobility vehicles while providing a low-cost, efficient solution aligned with current demands for sustainable mobility.
Análise crítica da evolução da norma NBR 5422 sobre projetos de linha de transmissão
(Universidade Federal de Goiás, 2025-12-05) Soares, Giovanna Luiza; Guedes, Leonardo Guerra de Rezende; Guedes, Leonardo Guerra de Rezende; Valle, Ana Claudia Marques do; Deus Júnior, Getúlio Antero de
This final course project analyzes how the evolution of technical and scientific knowledge has contributed to the standardization process of engineering activities and studies, highlighting how updates to technical standards support and reinforce the development of electrical engineering projects. In this context, the importance of the periodic revision of standards is emphasized, as it enables the incorporation of technological advances, new operational demands, and climate changes into technical criteria, ensuring that projects remain aligned with their current context and reality. As an example, the study addresses the update of ABNT NBR 5422, published in 2024, which replaces the previous version from 1985. This standard covers the design of overhead electric power transmission lines, and its modernization reflects nearly four decades of technological and scientific progress, introducing new parameters and enhancing calculations already established in the earlier version. The project highlights innovations in key aspects such as criteria for meteorological conditions, conductor sizing based on thermal risk, and safety distances. These elements are comparatively analyzed between the two versions of the standard, revealing the main changes and their impact on transmission line projects. The identified differences are presented in the comparative analysis section and consolidated in the results, providing a clear view of the updates and their relevance to the electric power sector.
Procedimentos de manutenção em transformadores de potência – estudos de casos em centro de manutenção
(Universidade Federal de Goiás, 2025-07-01) Santana, Gabriel de Almeida Fernandes; Oliveira, Iury Alves de; Marques, André Pereira; Ribeiro, Cacilda de Jesus; Ribeiro, Cacilda de Jesus; Marques, André Pereira; Souza, Gustavo Souto de Sá e; Mendanha, Vinícius Faria Costa
The maintenance of power transformers in maintenance centers involves complex procedures whose efficiency is fundamental to guaranteeing the reliability and durability of these strategic assets. The absence of a standardized routine can lead to operational errors and inaccurate diagnoses, directly impacting the safety and lifecycle costs of the equipment. In this context, the objective of this work is to present the development of a methodology for standardizing preventive and corrective maintenance procedures in power transformers, focusing on activities performed in specialized repair centers. The methodology adopted was based on the elaboration of technical flowcharts, developed from a review of technical and normative literature, and application and validation through a real case study of a 34.5/13.8 kV and 4.3 MVA power transformer. As a result, these flowcharts clearly and sequentially map all stages of the process, from receiving the equipment and performing diagnostic tests to the disassembly, repair, and final commissioning phases. Therefore, it is concluded that this final course project offers a practical application tool for the management and execution of maintenance, contributing to the mitigation of procedural failures, optimization of routines, and the training of technical teams, aiming at increasing the operational reliability of power transformers.
Filtragem de ruído em sinais de eletrocardiograma e áudio utilizando autoencoders e mecanismos de monitoramento
(Universidade Federal de Goiás, 2025-06-25) Moreira, Isaías Ramos; Cardoso, Álisson Assis; Cardoso, Álisson Assis; Lemos, Rofrigo Pinto; Corrêa, Henrique Pires
This study proposes an approach based on autoencoders with residual blocks and monitoring mechanisms for filtering electrocardiogram signals contaminated by noise, both in isolation and in combination, as well as spectrograms corrupted by common urban environmental noise generated from audio files. Two distinct architectures were evaluated: one using a Squeeze-and-Excitation block and another incorporating a monitoring mechanism called the Attention Block. The models were tested on electrocardiogram signals and spectrograms contaminated with noise to assess their performance in signal reconstruction and noise removal tasks. The Attention Block demonstrated superior performance in both tasks. This advantage is attributed to its ability to integrate channel-wise attention mechanisms and local noise detection, which proved relevant when multiple types of i
Adequação do método da soma das potências versão retangular considerando elementos shunts de barra e de ramos de redes de distribuição
(Universidade Federal de Goiás, 2025-06-25) Santos, Ronny Clézio Dias dos; Brigatto, Gelson Antônio Andrêa; Brigatto, Gelson Antônio Andrêa; Garces Negrete, Lina Paola; Kopcak, Igor
Electrical distribution networks are mostly composed of series elements, which justifies the use of classical power flow algorithms based on this topology, such as the Power Summation Method (PSM) in its polar and rectangular versions. However, the inclusion of shunt elements—such as voltage regulators, capacitor banks, reactors, and the capacitive effects of feeders—requires adaptations to traditional methods. While the formulation of the PSM in polar coordinates with shunt elements is already discussed in the literature, there is still a lack of equivalent development for the PSM in rectangular coordinates. This work aims to propose a formulation that incorporates these elements into the rectangular PSM. The necessary equations are developed, followed by computational tests to evaluate the accuracy and performance of the proposed method compared to existing approaches. The results indicate that the new formulation preserves the reliability of classical methods while extending their applicability to more complex network configurations.
DigSILENT PowerFactory software’s potential for analyzing electrical power systems
(Universidade Federal de Goiás, 2025-06-30) Amaral, Anna Beatriz Fernandes; Garces Negrete, Lina Paola; Garces Negrete, Lina Paola; Brigatto, Gelson Antônio Andrêa; Kopcak, Igor
Modern power systems require rigorous analysis to meet operational criteria of stability, efficiency, and compliance with operational standards. This research investigates steady- state load flow analysis using DigSILENT PowerFactory software, employing two case studies to simulate power flow through the Newton-Raphson method. The main results evaluated correspond to voltage magnitudes, phase angles, and active/reactive power distribution, identifying voltage deviations from the American National Standards Institute (ANSI C84.1- 2020) voltage standards. Tests performed on the IEEE 14-bus system and Peru’s National Interconnected Electric System (SEIN) yielded results demonstrating efficient convergence in few iterations, validating the algorithm’s robustness for both small and large-scale networks, while its computational accuracy was confirmed through comparative analysis with MATLAB simulations. The software's integrated visualization tools and automated reporting features highlight its usefulness for analyzing voltage profiles and power flows, while emphasizing the importance of voltage regulation strategies and reactive power management to fulfill operational constraints. Beyond the theoretical study, the research extended to simulating Peru’s National Interconnected Electric System (SEIN), demonstrating PowerFactory’s capability for large-scale simulations that, in this case, revealed critical challenges such as overvoltages at specific buses and transmission losses, reinforcing the need for optimizations in planning and operating complex power networks.
Estratégias para a mitigação de fluxo reverso em redes de distribuição com alta inserção de geração solar fotovoltaica
(Universidade Federal de Goiás, 2025-07-02) Pereira, Ivan Santos; Vergara, Gustavo da Costa; Garces Negrete, Lina Paola; Garces Negrete, Lina Paola; Vergara, Gustavo da Costa; Belchior, Fernando Nunes; Kopcak, Igor
The electric power sector has undergone significant changes in recent times due to the growing demand for a cleaner and more sustainable energy matrix. In line with this trend, the Brazilian government began encouraging energy generation by consumers themselves through the Legal Framework for Distributed Generation (Law No. 14,300/2022 from Brazil), which has made photovoltaic distributed generation a rising trend in Brazil. However, the expansion of distributed generation (DG) can lead to negative impacts on the grid, such as reverse power flow and overvoltage at system buses. This situation raises concerns for utility companies and motivates studies aimed at monitoring and mitigating these adverse effects. This study aims to propose strategies to mitigate reverse power flow in distribution networks with high photovoltaic generation penetration and to assess their impact on the electrical system. The research proposes three strategies for mitigating reverse flow: a battery energy storage system (BESS), an inverter-based Grid Zero control, and PV Curtailment, which consists of limiting the power injected by the modules with an inverter when an increase in bus voltage is detected. The proposed strategies were implemented in a distribution network in São Paulo using OpenDSS, an open-source software developed by Electric Power Research Institute (EPRI) that performs power flow analysis. The assessment of effects included the analysis of power flow through critical transformers, the substation, as well as the monitoring of bus voltages and network energy losses. The results demonstrate that the proposed strategies were effective in mitigating reverse power flow. Battery allocation yielded the best results, enabling the full use of energy generated by photovoltaic plants. The Grid Zero inverter curtailed part of the generation but was effective in mitigating reverse flow and presents a more economical alternative. PV Curtailment was the least effective in attenuating reverse flow, but managed to decrease the voltage rises in the nodes more efficiently than the other cases did.
Aplicação de otimização por enxame de partículas no projeto de linhas de transmissão aéreas de extra alta tensão
(Universidade Federal de Goiás, 2025-06-30) Barbalho, Aliucha Morais; Jesus, Ana Gabriela Machado de; Kopcak, Igor; Garces Negrete, Lina Paola; Brigatto, Gelson Antônio Andrêa; Kopcak, Igor
This paper presents the implementation of the Particle Swarm Optimization (PSO) algorithm in the design of transmission lines. The main objective is to highlight the benefits of using the algorithm to navigate a complex scenario in the evaluation of the expansion of extra-high voltage overhead lines, finding the best alternative for cost reduction, considering a set of possibilities for the number of conductors per bundle, variation in the cross-section of the conductors and spacing of the geometric arrangement of the bundle. The applicability of the proposed tool was motivated by two case studies for transmission line scenarios in countries with substantial territorial extension, whose results proved its viability as a support for the design of transmission lines. The application of the (PSO) proved to be effective in the optimization of design variables, such as gauge, number of subconductors and spacing, allowing the identification of configurations that balance costs and electrical performance. The developed tool allows the structured recording of input parameters, the documentation of the results obtained and the comparative analysis between alternatives. Thus, it contributes to the technical-economic planning of new lines, allowing for the reduction of losses, maximization of transmission capacity and greater efficiency in the use of resources. Thus, the use of meta-heuristic methods such as PSO represents a promising alternative to assist engineers and planners in decision-making in electric power transmission systems.
Adequação do método da soma das correntes considerando elementos shunts de barra e de ramos de redes de distribuição
(Universidade Federal de Goiás, 2025-06-25) Oliveira, Arthur Custódio de; Rocha Júnior, Enes Maximino da; Brigatto, Gelson Antônio Andrêa; Brigatto, Gelson Antônio Andrêa; Garces Negrete, Lina Paola; Kopcak, Igor
The modeling of electrical power distribution networks usually considers the network topology as consisting only of series branch elements. This characteristic underlies the classical algorithms for calculating the load flow of distribution networks, such as the Current Sum Method (CSM), so that the inclusion of shunts such as voltage regulators, capacitor banks or reactors and capacitive effects of feeders requires adaptations to the traditional methods. Although the formulation of the Power Sum Method considering shunts has already been addressed in the literature, the equivalent for CSM needs to be developed. This work aims to propose an adaptation of the Current Sum Method for load flow analysis in distribution networks, with the inclusion of reactive shunt elements of buses and branches of the network. The work contemplates the reformulation of the classic MSI with the incorporation of new terms to the equations, as well as the application of the computational implementation of the proposal in test networks for performance comparison and validation of the results with already consolidated solution methods. Case analysis demonstrates that the new approach allows representing the effects of reactive elements on voltage profiles and system losses equally accurately. Thus, this work contributes with a model applicable to the simulation requirements of actual distribution networks, with potential for adaptation to scenarios with distributed generation and control devices.
Otimização de pré-codificação conjunta com formação de clusters em um sistema cell-free auxiliado por RIS
(Universidade Federal de Goiás, 2025-06-23) Tealdi, Paulo; Coelho, André Almeida Souza; Lemos, Rodrigo Pinto; Lemos, Rodrigo Pinto; Cardoso, Alisson Assis; Castro, Marcelo Stehling de; Coelho, André Almeida Souza
This final course project aims to present the theoretical foundations related to Reconfigurable Intelligent Surfaces (RIS) and the cell-free architecture, including construction aspects, phase-shift constraints of the RIS, performance analysis, and comparisons. Based on this, a clustering algorithm for RIS-aided cell-free networks is proposed, in which, for each user equipment (UE), a set of access points (APs) responsible for transmission is dynamically selected, as well as a subset of RISs that will assist in communication. In this way, cluster formation is carried out in a UE- centric manner, aiming to optimize the WSR (weighted sum-rate) and reduce signaling overhead. The optimization of the WSR with respect to the active precoding vector (precoding at the APs) and the passive precoding (RIS phase-shift matrix) is performed based on existing alternating optimization algorithms in the literature. Therefore, with the subdivided problem, the lustering part is introduced and solved here using a greedy algorithm.

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