Portal de Programas de Pós-Graduação (UFRN)

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MPEE PROGRAMA DE PÓS-GRADUAÇÃO EM ENERGIA ELÉTRICA CENTRO DE TECNOLOGIA Phone: Not available E-mail: Not available https://posgraduacao.ufrn.br/mpee

Dissertations/Thesis

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2024

	Dissertations
1	FRANCISCO ALAN DA SILVA MONTEIRO ANALYSIS OF THE IMPACT OF POWER QUALITY ON THE ELECTRICAL NETWORK OF THE UFRN CENTRAL CAMPUS WITH THE INSERTION OF SOLAR PHOTOVOLTAIC GENERATION. Advisor : CRISLUCI KARINA SOUZA SANTOS CANDIDO COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO JOSE LUIZ DA SILVA JUNIOR MAX CHIANCA PIMENTEL FILHO PAULO VITOR SILVA Data: May 17, 2024 Ata de defesa assinada: Show Abstract Atualmente, os estímulos à produção de energia elétrica a partir de fontes limpas estão crescendo significativamente devido à escassez de combustíveis fósseis, anteriormente amplamente utilizados. Ao mesmo tempo, as unidades de geração distribuída que empregam fontes renováveis estão ganhando impulso com a redução dos impostos sobre os componentes dos sistemas de geração que utilizam essas fontes de energia. No entanto, o aumento no número desses sistemas conectados às redes de distribuição de baixa tensão tem impactado severamente a qualidade da energia. Neste trabalho, são examinados os efeitos na rede elétrica da UFRN resultantes da conexão de três instalações fotovoltaicas em 2022. Além das instalações já em operação, estão previstos outros sistemas fotovoltaicos nos próximos anos dentro do Campus Central, como parte dos esforços para atingir metas de sustentabilidade. A avaliação baseia-se em indicadores de qualidade da energia elétrica, incluindo potência, harmônicos de tensão e corrente, desequilíbrios entre as fases do sistema e regulação do fator de potência. Esses indicadores serão avaliados por meio de um analisador de rede, comparando-os com os limites estabelecidos pelas normas.
2	WILLDEMBERG INÁCIO DUARTE DE MELO AUTOMATIC ELECTRICAL POWER RECOMPOSITION SYSTEM POWERED FROM THE USE OFSTATIONARY BATTERIES Advisor : MARCOS ANTONIO DIAS DE ALMEIDA COMMITTEE MEMBERS : ALDAYR DANTAS DE ARAUJO ARRHENIUS VINICIUS DA COSTA OLIVEIRA MARCOS ANTONIO DIAS DE ALMEIDA MAX CHIANCA PIMENTEL FILHO Data: Jun 4, 2024 Ata de defesa assinada: Show Abstract Although electric power companies increasingly seek to adhere to the quality energy indicators required by the National Electric Energy Agency, it is a fact that there are regions, both in Brazil and abroad, where power outages have caused inconvenience to the population. The objective of this study is to present a device capable of mitigating this problem, through the organization and integration of various electrical components available in the market. This device, when organized, constitutes an emergency circuit for automatic power restoration, powered by the use of stationary batteries, aligning with the theories of medium and low voltage electrical microgrids, enabling the provision of emergency loads (Costa et al., 2018; Felipe, 2022; Ju et al., 2018; Silveira Junior, 2022; Li et al., 2017). The product has been implemented in a residence to partially supply power during interruptions from the electric power utility, aiming to ensure continuous supply of essential devices for user well-being, health, and communication, as well as to collect data for more accurate sizing. To refine the device's sizing, the quality indicators DEC and FEC of each region are used, which allow for mathematical modeling to approximate the real consumption of emergency loads by the consumer unit. This is crucial for storing and using accumulated energy more efficiently. This device resembles an off-grid system; however, it is automated, and its function is activated in the event of a power outage. As a conclusion, the importance of residences having emergency systems that operate in an isolated and sustainable manner for users, such as those requiring home care, remote work, and others, is highlighted.
3	FLÁVIO HENRIQUES GONÇALVES DEVELOPMENT OF THE HORUS PLATFORM FOR FAILURE PREDICTION - CASE STUDY: SET OF BLADE ANGLE MOTORS IN A WIND GENERATOR. Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : RICARDO FERREIRA PINHEIRO GABRIEL IVAN MEDINA TAPIA JOSE TAVARES DE OLIVEIRA UBIRATAN HOLANDA BEZERRA Data: Aug 23, 2024 Ata de defesa assinada: Show Abstract Efficient management of wind farms is essential to ensure sustainability and maximize renewable energy production. One of the main challenges is preventive maintenance and the prediction of failures in critical components, such as the set of blade angle motors in wind turbines, commonly called “pitch motors”. Predictive maintenance is an emerging field that promises greater operational efficiency and cost savings. In this context, the Hórus platform, which is the product of this work, appears as a viable alternative, aiming to contribute to the health management of wind turbines. The Hórus platform was developed to predict failures in wind turbine “pitch motors”, with a flexible architecture that allows the inclusion of other equipment and predictive maintenance techniques. The choice of the name Horus, inspired by the Egyptian god of vision, reflects the essence of the platform: offering a clear and anticipated view of maintenance needs, avoiding unexpected interruptions and maximizing operational efficiency. Hórus' technological structure combines data analysis and visualization tools, such as Power BI for processing large volumes of data and Python for complex algorithms. The visual interface is developed with HTML and CSS, providing a friendly and interactive experience. Data collection by Hórus involves multiple points, such as machine failure data, alarms, operating guidelines, wind history, among others. The integration of this data allows for a comprehensive and detailed analysis, essential for accurate forecasts adapted to the particularities of each wind farm. The user-friendly interface makes it easier for managers to interpret data, while the ability to integrate with other management systems guarantees a holistic view of operations. The failure prediction methodology includes the Jack-knife Diagram, Weibull Distribution and an empirical weight and penalty method based on the experience of the author of this work in the wind sector, allowing an effective classification and prioritization of failures. The Horus platform combines advanced and low-cost analytical tools; customization of analysis and report screens; integration of multiple data sources for analysis; Continuous evolution in beta mode. The first results of the implementation of the Hórus platform, which began in 2022, show a satisfactory assertiveness rate in the predictions made. The purpose of this work is to offer a “predictive vision” that allows managers and technical staff of wind farms to identify and resolve potential problems before they affect the production of electrical energy, thus promoting operational efficiency, reducing the cost of electrical energy and the sustainability of wind farms.
4	MATHEUS LEAL SILVA CONTROL PROPOSAL SIMPLIFIED FOR SYSTEMS SMALLELECTROLYSIS USING RENEWABLE SOURCES OF ELECTRICAL ENERGY IN THE CONTEXT OF VEHICLE HYBRIDIZATION Advisor : ANTONIO WALLACE ANTUNES SOARES COMMITTEE MEMBERS : ANTONIO WALLACE ANTUNES SOARES MAX CHIANCA PIMENTEL FILHO MICHEL SANTANA DE DEUS THIAGO DE OLIVEIRA ALVES ROCHA Data: Oct 7, 2024 Ata de defesa assinada: Show Abstract Hydrogen’s economy has been getting importance in the last years as part of global economy electrification of energy vectors solutions proposed and industry decarbonizing (energy transition). Then, instead of producing Hydrogen from polluting sources (Gray Hydrogen),as industry uses to do nowadays, it’s noticing a tendency in search of methods for capture greenhouse gases from the steam reforming (blue hydrogen) and also through electrolysis using sustainable sources of energy, mainly photovoltaic cells and wind generators - the green hydrogen. Still in this context of economy using Hydrogen as a energetic vector, many applications can be implanted both in stationary loads (as heat producing, for example) and mobility uses, when hydrogen is used to move vehicles. According to the last one, there are two main types of vehicle that use hydrogen: using H2 applied in fuel cells to produce electricity so feed an electric motor (electromobility); and the vehicle that uses just H2 as fuel itself in an internal combustion motor to move the car. Although these kinds of motors are already available commercially, they’re not mature enough technologies to achieve the required scalability in market. So an intermediate and lower cost solution is proposed: the utilization of Hydrogen, more specifically, the gaseous combination between Hydrogen (H2) and Oxygen (O2), as known as Hydroxy Gas or HHO Gas, together with conventional fuels as gasoline and diesel in internal combustion engines: the vehicle hybridization in order to reduce greenhouse gases emissions and the costs of fueling. This present work paper talks about a simplified control system for green electrolysis for HHO producing that can contributes to future studies and prototype conceptions related vehicular hybridization. This control system is based on ESP32 microcontroller, making proportional and integrative actions, reading the controlled variable (HHO flow rate) and adjusts the input current of eletectrolyzer (handled variable) in function of predetermined setpoints of flow rates. For this implementation, the transfer functions related to rates of currents inputs were modeled using the black box method, and is expected an automatic adjustment of current from setpoint given by the driver (operator)
5	MATHEUS PRADO GALLI MARTINS Hardware and Software Rapid Prototyping Platform for Power Electronic Converters Advisor : THIAGO DE OLIVEIRA ALVES ROCHA COMMITTEE MEMBERS : ANTONIO WALLACE ANTUNES SOARES FLAVIO BEZERRA COSTA JOSE ALBERTO NICOLAU DE OLIVEIRA THIAGO DE OLIVEIRA ALVES ROCHA Data: Oct 11, 2024 Show Abstract Power Electronic Converters CEPs offer high capacity for efficient control of electrical energy flow. Until the 1990s, the main application of this technology was to drive industrial motors and conventional power supplies, such as rectifiers, choppers, or even inverters. In addition to traditional use, converters are employed in a wide range of low, medium, and high-power applications, including residential applications, centralized renewable energy generation, distributed generation, and electric vehicles. The complexity and great variability of the new CEP topologies make it mandatory to use Digital Signal Processors DSPs, microcontrollers, and Field Programmable Gate Array FPGAs to implement digital control. In universities and industries, these new control strategies for CEPs are developed and tested in the Hardware-in-the-Loop HIL platforms with a Rapid Control Prototyping RCP software environment. High investments are required for these commercial solutions, which generally use proprietary technology. In addition, and also a very relevant aspect, is the project-oriented teaching methodology used in universities to develop the necessary skills for engineers, technicians, and enthusiasts who develop new solutions and R&D strategies. In this sense, this work proposes the implementation of an RPP Rapid Prototyping Platform for the implementation of CEP prototypes, which consists of a Main Cabinet equipped with MPR Rapid Prototyping Modules that are a functional improvement of existing solutions that focus on rapid software prototyping and do not allow hardware changes and development. This is an affordable solution for students and professionals who use and operate CEPs to build their projects using hardware and software design techniques, as well as implementation tools using the Do It Yourself DIY concept. The boost converter design is presented, as is its implementation in a simulation and experimental via PPR.

2023

	Dissertations
1	LORENA MARIA MORAIS FERNANDES COELHO “Life cycle analysis applied to photovoltaic solar plants: a approach in the context of the UFRN plant” Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : RICARDO FERREIRA PINHEIRO JOSE LUIZ DA SILVA JUNIOR MANOEL FIRMINO DE MEDEIROS JUNIOR NEILTON FIDELIS DA SILVA Data: Jul 3, 2023 Ata de defesa assinada: Show Abstract “In today's world, the search for sustainability linked to human development is one of the greatest challenges. Measures, actions and various methods are being thought and Applied in order to minimize the anthropic effects that have been accelerating global warming and achieving environmental balance. In this scenario, the use of renewable energies, such as solar photovoltaics, is presented as an alternative for mitigating Greenhouse Gas (GHG)emissions. This study pointed out the need to verify the environmental aspects andpotential impacts throughout the life cycle of a photovoltaic solar plant. For this, a LifeCycle Analysis (LCA) study was developed. Given this scenario, knowing that theFederal University of Rio Grande do Norte (UFRN), as a public teaching institution thatplays the role of promoting economic development linked to the preservation of the environment, several incentives have been created to disseminate the implementation of sustainability in this field. An LCA of the UFRN photovoltaic solar plant was carried out to obtain an energy inventory and a carbon inventory, measuring the amount of GHG that the university will no longer emit with the operation of this plant. This study provides the energy payback time and the carbon payback time of the UFRN solar plant. The reported values will be recommended to serve as a basis for creating new sustainability goals in the University's Sustainable Logistics Plan (PLS).”
2	ANDERSON NICHOLAS LIMA DE OLIVEIRA RAMOS STUDY OF THE IMPACT OF SOLAR PHOTOVOLTAIC GENERATION ON SHORT-CIRCUIT LEVELS AND PROTECTION OF THE ELECTRICAL POWER SYSTEM AT THE CENTRAL CAMPUS OF UFRN, USING THE SOFTWARE OpenDSS Advisor : MARCOS ANTONIO DIAS DE ALMEIDA COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA MARCOS ANTONIO DIAS DE ALMEIDA MAX CHIANCA PIMENTEL FILHO RODRIGO PRADO DE MEDEIROS Data: Jul 21, 2023 Show Abstract Three photovoltaic (PV) systems were installed in 2022 within the energy distribution network of the Federal University of Rio Grande do Norte (UFRN) Central Campus. Beyond the already connected and functional solar generators, new PV systems in Central Campus are foreseen within the next years, for the purpose the complying with sustainable goals. With the implementation of distributed generation, urges the necessity to evaluate protection parameters of the electric power system, considering that the load flow, which were essentially unidirectional – from COSERN grid to the load –, now turns bidirectional. The main focus of this work is to analyze solar plants contribution to short-circuits in the power system of the UFRN Central Campus and to define directional protection parameters of the electric substations where the photovoltaic panels were connected and of their feeders, in order to guarantee coordination between series protection devices.
3	KAIO CÉSAR RODRIGUES DE OLIVEIRA APPLICATION OF THE CONCEPT OF CYCLIC LOADS FOR SIZING CONDUCTORS IN PHOTOVOLTAIC PLANTS Advisor : MAX CHIANCA PIMENTEL FILHO COMMITTEE MEMBERS : EDNARDO PEREIRA DA ROCHA JOSE LUIZ DA SILVA JUNIOR MARCOS ANTONIO DIAS DE ALMEIDA MAX CHIANCA PIMENTEL FILHO Data: Jul 21, 2023 Show Abstract The first Industrial Revolution occurred around 1760, started in England, and was characterized by the great technological development that promoted transformations social and economic issues in Europe and the world. The Revolution marked the transition from the period feudal to the capitalist system. It is noteworthy that, before this period, work was done manually by men, women and children, who often turned their homes into workshops to carry out activities, a phenomenon understood as manufacturing. The forces of nature like the wind, the water, fire and human strength were the sources of energy for carrying out work, not having industrial production that caused great impacts to the environment. From the end of the 18th century, the Revolution promoted intense transformations in the society and in the productive system, with the emergence of steam machines, industries, new work relationships, etc. Industrial expansion promoted an increase in greenhouse gas emissions greenhouse effect in the atmosphere and the consumption of fossil fuels, particularly the coal. Over time, industrial demand and the use of natural resources increased, impacting the environment with deforestation, soil erosion, extraction of raw material; and also brought consequences for the climate, such as floods, waves of heat and the increase in Earth's average temperatures (global warming) due to emission of greenhouse gases, for example. Between the end of the 19th century and the beginning of the 20th century, petroleum derivatives to be the main sources of energy, in addition to fuel for transport and industry in itself. However, with the oil crisis in the 1970s, interest in investments to enable the development of renewable energy and its application in commercial scale. In addition, the growing concern about environmental problems and climate - such as environmental degradation, food security, species extinction of animals, among others - also contributed to awakening a quest to mitigate these impacts. In this way, greater use of energy obtained from renewable sources becomes one of the alternatives for this purpose. The first Industrial Revolution occurred around 1760, started in England, and was characterized by the great technological development that promoted transformations social and economic issues in Europe and the world. The Revolution marked the transition from the period feudal to the capitalist system. It is noteworthy that, before this period, work was done manually by men, women and children, who often turned their homes into workshops to carry out activities, a phenomenon understood as manufacturing. The forces of nature like the wind, the water, fire and human strength were the sources of energy for carrying out work, not having industrial production that caused great impacts to the environment. From the end of the 18th century, the Revolution promoted intense transformations in the society and in the productive system, with the emergence of steam machines, industries, new work relationships, etc. Industrial expansion promoted an increase in greenhouse gas emissions greenhouse effect in the atmosphere and the consumption of fossil fuels, particularly the coal. Over time, industrial demand and the use of natural resources increased, impacting the environment with deforestation, soil erosion, extraction of raw material; and also brought consequences for the climate, such as floods, waves of heat and the increase in Earth's average temperatures (global warming) due to emission of greenhouse gases, for example. Between the end of the 19th century and the beginning of the 20th century, petroleum derivatives to be the main sources of energy, in addition to fuel for transport and industry in itself. However, with the oil crisis in the 1970s, interest in investments to enable the development of renewable energy and its application in commercial scale. In addition, the growing concern about environmental problems and climate - such as environmental degradation, food security, species extinction of animals, among others - also contributed to awakening a quest to mitigate these impacts. In this way, greater use of energy obtained from renewable sources becomes one of the alternatives for this purpose. Renewable energy sources are considered to be inexhaustible, as they are renewed constantly. Water, ocean, solar, wind, biomass and geothermal sources are 12 examples of his type of energy. Solar energy comes from the light and heat of the sun, used for both electricity generation and water heating. her use for electricity production has reached great rates, both in Brazil and abroad. world. As with all sources of energy generation, it is necessary to have a good project for the construction of centralized photovoltaics lar power plants.In this sense, this work aims to present the application of a methodology for sizing the electricity conductor cables of a Solar Power Plant Photovoltaic, installed underground in cable trenches, based on the cyclic generation pattern of energy for this type of enterprise. This methodology seeks to mitigate problems due to the thermal interaction of the conductors in the mentioned condition, and also to evaluate the possibility to reduce the sections of these in the desig process, compared to the results of sizing when the analysis of the energy generation cycle is not carried out, that is, by conventional method. As a result of this type of evaluation, a reduction in the overall cost of building a photovoltaic project, due to the reduction in width ditch to be excavated to accommodate the cables, and/or reduce the section, without losing technical support or violate any normative regulation.

2022

	Dissertations
1	ELTON PEREIRA DE SOUZA Comparative Analysis between Corrective Switching Technique and the Redispatch of Gereration in Power Systems Advisor : ARRHENIUS VINICIUS DA COSTA OLIVEIRA COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA MANOEL FIRMINO DE MEDEIROS JUNIOR MAX CHIANCA PIMENTEL FILHO AYLANNA RAQUEL DA COSTA OLIVEIRA Data: Dec 21, 2022 Ata de defesa assinada: Show Abstract In view of the changes in the composition of the energy matrix and the gradual increase in demand for electricity, studies of techniques to mitigate technical losses in power systems are encouraged. Thus, considering the cost-benefit of existing solutions in the market, it is observed the generation redispatch as a more widespread solution. However, the Corrective Switching technique stands out for providing cost reduction and a shorter execution time, when compared to generation redispatching. In this sense, this paper aims to establish a comparison between both techniques, presenting their pros and cons and validating the results obtained in two distinct electric grids. In a first step, the methodology developed for the Corrective Switching technique selects, by means of the Relief Function, the most promising variants in order to eliminate the overload in an overloaded branch, without causing overloads in other branches. From this selection and the execution of the load flow, the variants are ranked according to the total electric losses of the electrical network, choosing the most efficient variant. In a second step, for the generation redispatch methodology, a linearization of the electric losses minimization problem is proposed by means of the Lagrange method and the Gradient method. Therefore, using the simulation software Scilab, two routines will be developed - one for each technique - that will be executed for the chosen networks in order to validate the results.
2	PEDRO MATEUS PIMENTA RODRIGUES Analyze of Lightning Strike in Wind Generators Using ATP Advisor : JOSE TAVARES DE OLIVEIRA COMMITTEE MEMBERS : JOSE TAVARES DE OLIVEIRA MANOEL FIRMINO DE MEDEIROS JUNIOR RICARDO FERREIRA PINHEIRO THALES AUGUSTO DE OLIVEIRA RAMOS Data: Dec 21, 2022 Ata de defesa assinada: Show Abstract The rapid growth of wind power generation is aligned with the guarantee of reducing polluting gases in the atmosphere, being a source of clean and renewable energy with great potential to generate employment and income. These factors make wind energy in line with national energy goals and make up a portion of the country's energy matrix. Brazil is a country of continental dimensions and has regions with high incidences of lightning strike, in this environment the impacts caused by lightning strike in wind turbines and other components of a wind farm is one of the most important issues in the implementation and operation of the complexes. In addition, several parks are installed in mountainous areas or mountain ranges that have soil with peculiar geophysical characteristics and high resistivity, causing, in addition to greater exposure to lightning strike, a difficulty in ensuring effective flow of spurious currents to the soil. In some cases, in addition to the forced shutdown that causes the generating units to be unavailable, the recomposition through the replacement of machine components can be extremely expensive, given the dimensions and specificities of some components. In this way, the present work aims to analysis the behavior of voltage surges caused by the impact of lightning strike in wind farms, for which experimentally validated equivalent circuit models are used for the various components of the wind turbine, blades, tower, mechanical connection systems, and electrical, as well as the grounds. A standard wind farm with synchronous generators connected to the transmission network will be used to assess the voltage levels caused by the incidence of lightning at various points in the system. The simulations will be performed with ATP (Alternative Transients Program), through its graphical interface ATPdraw. During the simulations, changes in specific parameters are carried out to investigate the behavior of the system during the transient caused by the impact of lightning, so that scenarios that allow the validation and proposition of improvements about the response to lightning surges can be evaluated.
3	PAULO RAMON OLIVEIRA DE LIMA Computational Software Design for the Analysis of Optimal Energy Consumption in Electric Energiy Distribution Networks and Efficiency of your Billing. Advisor : MAX CHIANCA PIMENTEL FILHO COMMITTEE MEMBERS : MAX CHIANCA PIMENTEL FILHO ARRHENIUS VINICIUS DA COSTA OLIVEIRA JOSE LUIZ DA SILVA JUNIOR MARIO ORESTES AGUIRRE GONZALEZ HUMBERTO DIONISIO DE ANDRADE Data: Dec 22, 2022 Ata de defesa assinada: Show Abstract With the increase in the number of renewable energy generators and energy commercialization, there is a disruptive trend in the current model of energy management in the Brazilian electricity sector. The electric energy in Brazil was previously acquired exclusively from state-owned generators and passed on to consumers through their distributors, however, now it can be traded between self-producers, independent producers, generators, traders, free consumers and special consumers in the Brazilian free energy market. Status Quo provides a focus for distributors activities on the maintenance, operation and development of distribution networks, in addition to an environment for the pluralized commercialization of electric energy. This commercial scenario drives the economy in the Brazilian electricity sector through the provision of new services such as personalized management of consumption and production of electricity for consumers. In this context, the acquisition of electrical energy encouraged as a source for the consumption of energy needs, the climate goals established in Brazil’s Nationally Determined Contribution (NDC) to the Treaty of Paris, as well as the adoption of strategies for the conscious consumption of energy, justify the development of instruments for a greater consumption of electric energy, obtaining the maximum efficiency of income to large consumers. To subsidize such changes and maximize their benefits, advanced levels of automation emerge, supporting the performance management of electrical distribution networks with greater capacity to support the operation and real-time supervision of consumer units. In this context, the aim of this work is the development of the scientific base needed for the implementation of technological solutions directed to the management problem of energy resources of the consumer units fed by Brazilian distributors.

2021

	Dissertations
1	GENILSON COSTA MUNIZ FILHO Photovoltaic Generation Proposal Using Bifacial Modules. Advisor : ARRHENIUS VINICIUS DA COSTA OLIVEIRA COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA JOSE LUIZ DA SILVA JUNIOR RODRIGO PRADO DE MEDEIROS THIAGO DE OLIVEIRA ALVES ROCHA Data: Jul 27, 2021 Show Abstract Centralized generation photovoltaic plants are a reality in the national energy matrix,driven by the sale of energy in the regulated market from the Empresa de Pesquisa Energética(EPE). For the registration of projects that wish to claim the sale of energy, it isnecessary to carry out a study of energy generation expectations. In this scenario, this paperproposes the analysis of a technology that has been applied in recent years to increasethe efficiency of photovoltaic plants, called by bifacial modules, approaching the mainpoints to be discused in the simulation and application of these modules in large powerplants.A methodology for calculating energy losses from a photovoltaic plant to the pointof injection was developed, through the calculation of hourly losses, and, as an input databasefor this simulation, an array of simulated photovoltaic inverters was performed inPVsyst software. Finally, the sizing of the main equipment of a photovoltaic plant usingbifacial modules and the simulation of this plant are presented, proving the applicationof the methodology previously discussed. In this way, it is expected that the work willserve as a reference model for possible simulations of photovoltaic plants using bifacialmodules, as well as for the study of the generation expectation of a large photovoltaicplant.
2	LEONARDO AUGUSTO DE AQUINO MARQUES Development of a portable three-phase energy meter and analyzer with interface via mobile app Advisor : JOSE ALBERTO NICOLAU DE OLIVEIRA COMMITTEE MEMBERS : ANTONIO WALLACE ANTUNES SOARES CRISLUCI KARINA SOUZA SANTOS CANDIDO EDUARDO NOGUEIRA CUNHA ERICO CADINELI BRAZ JOSE ALBERTO NICOLAU DE OLIVEIRA Data: Nov 24, 2021 Show Abstract This work presents the design, development, calibration and validation of a three-phase portable energy meter and analyzer, based on the Analog Devices ADE9000 chip, associated and under programmable supervision of the ESP32 microcontroller. The choice of ESP32 allows the Wi-Fi and Bluetooth Low Energy (BLE) interface to be added to the project, thus creating direct communication with the mobile application. It presents the technical basis present in the development, technology used and proposed solutions, as well as, theentire process and methodology used to perform the calibration of the meter, when carrying out experiments with wide current variation and keeping the measured error below 1%. It also presents the process of 3D modeling and printing of the meter box, used connectors, assembly and measurement process, as well as the development and communication of the mobile application developed exclusively for this applicability. The developed meter and analyzer was tested on a stand in order to validate all the desired functionalities, culminating in a hardware prototype and a mobile application for configuration and reading of the data.

2020

	Dissertations
1	LUÍS EDUARDO CARNEIRO DE OLIVEIRA METHOD FOR CHARACTERIZATION AND ANALYSIS OF LOSSES IN MEDIUM AND LOW VOLTAGE SYSTEMS OF ELECTRICITY DISTRIBUTION Advisor : CRISLUCI KARINA SOUZA SANTOS CANDIDO COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO JOSE LUIZ DA SILVA JUNIOR MAX CHIANCA PIMENTEL FILHO MELINDA CESIANARA SILVA DA CRUZ Data: Nov 12, 2020 Show Abstract The topic of electrical losses has been widely discussed in recent years among electricity distributors in Brazil. These losses correspond to the difference between the amount of electricity injected into the distributor's network, and the amount of energy billed. Part of these losses are considered technical losses, which consist mainly of the dissipation of energy in the various components of the electrical system, and the other part are considered non-technical losses, caused mainly by irregularities carried out for fraudulent registration of energy consumption (considered a crime of theft by the Penal Code) and billing failures. Today, concessionaires have very robust plans for combating non-technical losses, as they have actions that are easy to execute and have relatively low costs. Actions to reduce technical losses, since they require greater investment and intervention in the network, have a lower priority for electricity distribution concessionaires. This work focuses on technical losses, aiming to implement faster actions to reduce technical losses in the medium and low voltage segments of an electrical power system. Initially, a bibliographic review is carried out on the main topics related to electricity losses. Then, the work starts with a quantification of technical losses in various segments of our energy distribution system, following what is contained in Module 07 of the Electricity Distribution Procedures in the National Electric System (PRODIST). Finally, actions are proposed that reduce the losses quantified in the present work. In addition, the positive impact on energy and revenue is estimated, with the reduction of technical losses, proving the viability of these actions.
2	ARIEL SULLIVAN LINS PATRIOTA A project to use wind energy using hydrostatic transmission and the REF Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : RICARDO FERREIRA PINHEIRO JOSE TAVARES DE OLIVEIRA MANOEL FIRMINO DE MEDEIROS JUNIOR GABRIEL IVAN MEDINA TAPIA THALES AUGUSTO DE OLIVEIRA RAMOS Data: Dec 2, 2020 Show Abstract The electromagnetic frequency regulator (REF) is a versatile machine that can be combined in several energy systems. In the present work, a scheme to use wind energy using the REF is proposed, with emphasis on the modeling of its main components: the horizontal axis wind turbine, a hydrostatic transmission composed of axial radial piston pump and axial piston engines, both with variable displacement, in addition to the REF itself.

2019

	Dissertations
1	JOAO PABLO SANTOS DA SILVA AUTOMATION SYSTEM MODEL APPLIED TO THE OPERATION OF WATER SUPPLY NETWORKS Advisor : JOSE LUIZ DA SILVA JUNIOR COMMITTEE MEMBERS : JOSE ALBERTO NICOLAU DE OLIVEIRA JOSE LUIZ DA SILVA JUNIOR RAFAEL NUNES DE ALMEIDA PRADO Data: May 17, 2019 Show Abstract This work presents the implementation of an automation system for the operation of water supply networks present at the Companhia de Águas e Esgotos do Rio Grande do Norte (CAERN), through the use of adequate instrumentation to monitor the field variables, control units for optimization of the supply system, data telemetry, implementation of supervisory system and the proposal of a method for detecting hydraulic anomalies. The development of the project was based on concepts of intelligent cities for the establishment of sustainable control and efficient management, in addition to the use of industrial networks. In order to increase the operational efficiency, the work addresses the development of an intelligent embedded system for the detection of hydraulic anomalies that uses the wavelet transform. From the implementation it was possible to observe a substantial improvement in the operation of the system, allowing faster decision making based on variables monitored in real time. In addition to the generation of information that was not known due to the low index of initial instrumentation and absence of data telemetry.
2	JOAO MARIA VITAL DE PAIVA A propose of new topology of the medium voltage distribution system of the UFRN Central Campus after the new 69 kV subestation began to operate Advisor : ARRHENIUS VINICIUS DA COSTA OLIVEIRA COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA JOSE LUIZ DA SILVA JUNIOR MARCOS ANTONIO DIAS DE ALMEIDA RODRIGO PRADO DE MEDEIROS Data: Jun 26, 2019 Show Abstract In recent years the Federal University of Rio Grande do Norte - UFRN has undergone a process of development and growth, with the construction of new buildings and laboratories in its Central Campus. With this, it becomes necessary to adjust the energy distribution network so that it can adequately satisfy the new demand. This work has the initial objective of analyzing the current topology of the energy distribution network of the UFRN Central Campus, and then proposes a reconfiguration of the energy distribution network so that any interruption of energy in the network reaches the smallest number of possible consumers. Computational simulations will be performed in order to analyze the current situation of the energy distribution network in case of a defect and, from there, to carry out the reconfiguration project. Two models will be proposed, both respecting the “Plano Diretor do Campus Central – PD Campus”, which has the intention of presenting alternatives to recover the possible loads due to a defect or maintenance in the network.
3	GERFFESON ALMEIDA MOURA SYSTEM OF MEASUREMENT OF CONSUMPTION AND QUALITY OF ELECTRIC ENERGY WITH REMOTE ACCESS Advisor : JOSE ALBERTO NICOLAU DE OLIVEIRA COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO ERICO CADINELI BRAZ JOSE ALBERTO NICOLAU DE OLIVEIRA JOSE LUIZ DA SILVA JUNIOR Data: Aug 30, 2019 Show Abstract This work consists of the development of a meter of consumption and quality of electric energy. The device helps the consumer to monitor their spending, informs the consumption of each circuit that makes up the household electrical grid, determines the power quality parameters and records the outbreaks. In addition, allow the remote identification, through the internet, of the electric energy consumption of the various equipment connected in these circuits. This work presents a simple and functional non-intrusive method to measure the consumption of electric energy, so that it can be applied in energy efficiency programs, being the interface that feeds the consumer with information on the expenses of the various loads.
4	THALES BRUNO COSTA DE AZEVEDO Diagnosis of electricity consumption on UFRN's Central Campus and guidelines for improving energy quality, cost reduction and preventive maintenance optimization Advisor : MAX CHIANCA PIMENTEL FILHO COMMITTEE MEMBERS : ALDAYR DANTAS DE ARAUJO JUNIOR CRISLUCI KARINA SOUZA SANTOS CANDIDO JOSE LUIZ DA SILVA JUNIOR MAX CHIANCA PIMENTEL FILHO Data: Sep 12, 2019 Show Abstract A diagnosis of the consumption and quality of the electrical energy of the university campus of UFRN is carried out with the objective of proposing alternatives aiming at the reduction of spending with electricity. Sectors with various characteristics were selected to carry out the case study. As the main criterion of choice was required the existence of the system supervisory CCK enabled in the food of the sector, as a way of acquiring all the information necessary to the study. The larger problems of each sector were raised and proposals to mitigate the problems were carried out, with the reduction of the cost of energy the ultimate goal. The results show that several are the existing problems, but at the same time, alternatives to the solution are possible and able to lead to the reduction of consumption.
5	ALLAN DAVID SILVA DA COSTA "WEB APPLICATION FOR MONITORING ELECTRICAL PARAMETERS OF PHOTOVOLTAIC SYSTEMS" Advisor : MARCOS ANTONIO DIAS DE ALMEIDA COMMITTEE MEMBERS : JOSE ALBERTO NICOLAU DE OLIVEIRA JOSE LUIZ DA SILVA JUNIOR MARCOS ANTONIO DIAS DE ALMEIDA RODRIGO PRADO DE MEDEIROS Data: Nov 18, 2019 Show Abstract Renewable energy is already a reality in Brazil and there are more and more records of the implementation of wind farms and photovoltaic systems supporting the national development regarding the availability of electricity. This fact has been driven by the growing research and development of more efﬁcient materials and equipment, as well as the creation and updating ofnormsandstandardsaimedatpromotingtheuseofthesetechnologies. Thus,thepurpose of this work is the creation of a WEB application associated with a microcontrolled system, accessed by the world wide web, which enables the user to monitor the power generation of his photovoltaic system, providing efﬁcient management of the same and invoices. to be generated. This application will be developed in PHP programming language, which will serve as a human-machine interface, where will be shown the data from a hardware developed jointly with the application, which will contain all the sensors necessary to capture electrical and environmental quantities. The solar plant collection values can be stored at various points such as the system database. From these data, it will be possible to compare the electrical quantities, such as the energy generated with the environmental data that the studied system will be installed. Because there is a close relationship between these values and this will let you know if the system was well designed, or for example, which months the photovoltaic system is most efﬁcient from the perspective of the inﬂuence of temperature and, additionally, whichlocationsaremostsuitableforinstallationofaPVsystem. Inaddition, this application may be used in industries that have photovoltaic systems installed on their premises, since the information that will be provided by the application may serve some sectors of the company such as: maintenance, by checking the power generation efﬁciency of the plant. system; and ﬁnancial, from the data obtained, to see if really the system is being efﬁcient in reducing energy costs.
6	ÊNIO VALE DE OLIVEIRA CUNHA Harmonic Filter Design and Analysis for use in UFRN Substation Advisor : CRISLUCI KARINA SOUZA SANTOS CANDIDO COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO JACQUES COUSTEAU DA SILVA BORGES MAX CHIANCA PIMENTEL FILHO Data: Dec 10, 2019 Show Abstract The present work deals with the implementation and simulation in PSIM® software of the three most common types of current harmonic filters, which are the passive, active filter, using the split-capacitor topology and the SRF method, and hybrid, in the CTEC substation. (Engineering Technological Complex) at UFRN in order to improve the results obtained in the harmonic analysis recorded in energy analyzer equipment and based on these results choose the best filter type for this particular situation. In addition, the active and passive filter compensators are dimensioned, and a general system analysis approached to simulate the most realistic system possible.
7	ENIR DIAS NETO Design of a Monitoring and Actuation Device for Low Voltage Protection Systems Advisor : ARRHENIUS VINICIUS DA COSTA OLIVEIRA COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA JOSE ALBERTO NICOLAU DE OLIVEIRA MARCOS ANTONIO DIAS DE ALMEIDA RODRIGO PRADO DE MEDEIROS Data: Dec 20, 2019 Show Abstract With the advancement of micro generation technologies and the increasing number of users of these systems, the low voltage distribution network needs to be increasingly robust to withstand the future problems generated by these new challenges. Low voltage electrical protection systems are generally limited to overcurrent protections, where the actuator elements are mostly electromechanical devices. Although they have been appropriate for a long time, the insertion of nonlinear devices into the power grid can cause some disturbances that will be sensitized by simple devices. However, in medium and high voltage systems there are complex advanced measuring devices that have a number of functions for actuation and protection. This project aims at the construction and implementation of a prototype low voltage protection system that has, in part, protective functions that are unique to higher voltage systems. The prototype will use an ATMEGA 2460 microcontroller coupled to an Arduino “MEGA” model board, along with measurement and actuation elements (TCs, TPs, Shields, Contactor). It is hoped that by implementing the project on a low voltage system, it will be able to protect it more efficiently compared to conventional systems, and also to obtain more data for monitoring. The prototype will also have the oscillography function that will allow a more complete analysis of the data obtained by the protection system. It will also have a bluetooth communication system for communication with smartphones, allowing a real time data visualization. The project aims at the least possible cost, since one of the goals is that its accessibility collaborates so that it is implemented in as many systems as possible.

2018

	Dissertations
1	MARCOS ANTONIO DE ARAUJO SILVA Optimization of the Relay Parameterization in Radial Distribution Systems Using Genetic Algorithm Advisor : MAX CHIANCA PIMENTEL FILHO COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA MAX CHIANCA PIMENTEL FILHO RODRIGO PRADO DE MEDEIROS Data: May 2, 2018 Show Abstract Power concessionaires are now seeking to expand and modernize power systems in the face of new consumer demands and requirements established by ANELL. The protection of electrical systems plays a fundamental role in the maintenance of this system and in the control of its indicators. Distribution systems have several physical and technical characteristics, such as the operating time of the devices, load flows and short circuit levels. In view of the great diversity of these systems, the construction of a computational algorithm that assists in the mathematical procedures of system parameters, or even that, generate a previous automatic configuration of the devices is necessary in view of the wide demand offered to the protection engineers. The algorithm was initially modeled in order to determine the short circuit currents in each primary protection device, as well as to calculate the minimum currents of operation of the time overcurrent units and the timing adjustments of the relays. Due to the great universe of possibilities of adjustments offered by the code, evolutionary biology techniques were used, in order to choose in this population of possibilities the individual that makes the parameterization of this optimized system. If in the first generation the chosen individual does not match the optimal function, this population will be evolved from the procedures of natural selection, crossing and mutation of the individuals, present in the evolutionary techniques used in the algorithm. It is expected that genetic coding when applied to microprocessor devices with appropriate time interval characteristics according to standards, the algorithm is efficient and stable. However, for feeder circuits where the equipment timing is inadequate for a reliable study of coordination and selectivity, a change of the initial timing parameters will be suggested. If the absolute operation time of the feeder is minimized the procedure performed by the algorithm will be considered valid and the configuration presented at the end will be the best among all the population.
2	ÍTALO JOSÉ LOPES DE ALMEIDA ANALYSIS OF THE GENERATION OF ELECTRICAL ENERGY THROUGH BIOMASS OF SUGAR CANE: A CASE STUDY Advisor : MAX CHIANCA PIMENTEL FILHO COMMITTEE MEMBERS : JOSE LUIZ DA SILVA JUNIOR MAX CHIANCA PIMENTEL FILHO NEILTON FIDELIS DA SILVA Data: May 30, 2018 Show Abstract The production of electric power constitutes a major part of the economic growth planof any nation. Relative to other nations, Brazil possesses key advantages since thedesign of its energetic matrix can be based on abundant renewable sources. One suchsource, the focus of this work, is the biomass of the sugar cane, which is used in thecogeneration of power that strengthens the Brazilian matrix. Although long available,note that this source of energy has been underutilized in the commercial production anddistribution of electric power. The Program for the Incentive of Alternative Energysources (Programa para of Incentivo `as Fontes Alternativas de Energia, PROINFA),established by the Federal Government in 2002, but extinct today, and the rise of marketfor carbon credits triggered by the Kyoto Protocol, improved the situation in the lastdecade. Indeed, during this period, the sugar-cane biomass has been used moreintensely, emerging as an important component of the Brazilian energetic matrix. Thisdissertation analyzes data related to the harvest/milling and the amount of electric powerexported from a sugar-cane alcohol based thermoelectric plant that sells electric powerin an environment of regulated contraction (ERC) and in an environment of freecontraction (EFC), which is derived from sugar-cane bagasse. It was verified that usingthe bagasse as the sole source of fuel, it was not possible to supply the yearly amount ofpower that had been agreed upon with various electrical power companies. Therefore,new calculation were made to add the straw with the bagasse to increase the powerproduction at the end of the cycle. It is concluded that the combined bagasse-straw usedas the fuel for the plant would provide a significant increased to the exported power,achieving the annual goals, and considerably increasing the profits due to the sale ofelectric power.
3	JAQUELINE PEREIRA DA SILVA PROJECT OF MODERNIZATION OF THE SYSTEM OF MEASUREMENT AND CONTROL OF ENERGY OF THE CENTRAL CAMPUS OF UFRN Advisor : MARCOS ANTONIO DIAS DE ALMEIDA COMMITTEE MEMBERS : MARCOS ANTONIO DIAS DE ALMEIDA JOSE LUIZ DA SILVA JUNIOR FRED SIZENANDO ROSSITER PINHEIRO JOABSON NOGUEIRA DE CARVALHO Data: Jun 19, 2018 Show Abstract This work consists in the development of a project to modernize the energy measurement and control system of the central campus of UFRN, using the industrial fiber optic network for data communication. Currently the university has a system of measuring consumption and the phenomena that influence the quality of energy, composed of 76 equipment, which attend to various buildings, linked to the electrical feeders of these buildings. A percentage of the measuring equipment is in operation and another part damaged or not communicated with the OIC-Operation and Information Center. In the present project, the efforts will be directed to evaluation and diagnosis of the measurement and control equipment, existing means of communication, design for the buildings not served and complementation of the data network. At the end, a descriptive memorial and cost forecast will be made available for system modernization. With the execution of the project, the university will have a valuable management tool that will send the information in real time to OIC, allowing control, management and sectorization of electric energy consumption. This can be carried out by apportioning costs, analyzing demand, quality of energy and saving by reducing costs.
4	FRANCISCO DAVID MOTA SILVA Project of MINIGERATION of electric power through the photovoltaic system in military land organizations-center of intending navy in NATAL (CEIMNA) Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : JOSE TAVARES DE OLIVEIRA RICARDO FERREIRA PINHEIRO GABRIEL IVAN MEDINA TAPIA RENATO SAMUEL BARBOSA DE ARAÚJO Data: Jul 5, 2018 Show Abstract This work deals with solar photovoltaic generation. Due to the growing energy demand of military institutions and the need for energy consumption models that require less financial resources, the work proposes a reduction of electric energy costs with the installation of a solar photovoltaic mini-plant connected to the electric power grid. A power generation system based on the solar source is designed for the self-consumption of a pilot unit, integrated a power management system in which it will be possible, in the expansion, to identify the profile of the load curve of the unit under study allowing the total management of the measurement point and improvement of the management of the apportionment of energy bills in each Military Organization installed in the territory of BNN (Naval Base of Natal). The premise considered is the energy self-sufficiency of the building using the solar resource as a source of electric energy and thus follow the guidelines of the project CON ENERGIA of the Brazilian Navy that is structured in three pillars: Free Market, Energy Efficiency and Distributed Generation . This system has several advantages, among them the use of solar energy and reduction of greenhouse gas emissions, reduction of electric energy bill and reduction of electric losses with transmission, due to generation being close to consumption . The proposed system is designed to compensate for all pilot power consumption and an installed power of 165 kWp has been established. The basic components of the generation system and a three-dimensional modeling of the generation plant are detailed, as well as an economic feasibility analysis of the project.
5	JOALE DE CARVALHO PEREIRA Computing Program for Sizing systemsElectricity generation from biogas, with applicationIn the sewage treatment plant of the BALDO/CAERN Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : GABRIEL IVAN MEDINA TAPIA MANOEL FIRMINO DE MEDEIROS JUNIOR PAULO EDUARDO VIEIRA CUNHA RICARDO FERREIRA PINHEIRO Data: Jul 6, 2018 Show Abstract The present work was thought due to the great necessity of insertion of renewable sources of electric energy generation in the world energy matrix, more specifically, in the use of the available thermal energy in the biogas. This use, in addition to providing energy, adds benefits to the environment, because when not used, often biogas is released directly into the atmosphere, being very aggressive to the environment. In this proposal, biogas is used in internal combustion engines to drive electric generators. As a way to enable a better use of biogas production, a software, SAGGAS, was developed. Through the volumetric flow data of the biogas, its properties and technical characteristics of the installation, the SAGGAS simulates the operation of the generation system and determines a combination of generators that allows to maximize the generation of energy and the financial return. The program was applied to the Baldowastewater treatment plant, located in the city of Natal/RN and owned by the CAERN. The generation potential and economic viability of the investment were determined taking into consideration the associated costs, the energy to be made available for the installation and the surplus that will be injected into the distribution network.
6	HEITOR BRENO SILVA BEZERRA Survey and Diagnosis of Environmental Refrigeration Systems and Energy Efficiency Improvement Proposals for Buildings of the UFRN Central Campus Advisor : JOSE LUIZ DA SILVA JUNIOR COMMITTEE MEMBERS : ALDAYR DANTAS DE ARAUJO JUNIOR CRISLUCI KARINA SOUZA SANTOS CANDIDO JOSE LUIZ DA SILVA JUNIOR Data: Jul 13, 2018 Show Abstract Over the last few years, the UFRN has been receiving new air conditioning installations, to offer thermal comfort to those who use these environments and also to increase productivity. On the other hand, it was observed the considerable increase in the consumption of electric energy in the Central Campus, being necessary to take measures related to the rational use of these equipments. Since 2013, in some buildings of this university, the VRF (Variable Refrigerant Flow) system has been installed in some buildings. This system guarantees, in addition to the lower electricity consumption, better thermal comfort when compared to other air conditioning technologies, even though it is more expensive to implement. The VRF system is one of the greatest technological innovations for environmental conditioning, having the high energy efficiency, thanks to its characteristics and possibility of remote management, offering the best operational control of the machines connected to the network interface. The main characteristic of the VRF system is the high energy efficiency, since the system has multiple controllers, in order to guarantee the smooth operation of the machines and better distribution of the thermal load, thus avoiding perceptible temperature fluctuations within an environment. This study proposes to verify, from electrical measurements and analysis of investments and indexes related to energy quality, the feasibility of adopting the VRF in the Central Campus of this university, being part of the technological innovation process related to air conditioning due to the new solutions that the system proposes to the users of these installations, related to the comfort and, mainly, the energy efficiency.
7	EGBERTO DE ARRUDA MOREIRA Application of Hybrid Reclosers in Electricity Distributions Networks Advisor : ARRHENIUS VINICIUS DA COSTA OLIVEIRA COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA MARCOS ANTONIO DIAS DE ALMEIDA MAX CHIANCA PIMENTEL FILHO ALDAYR DANTAS DE ARAUJO JUNIOR Data: Jul 30, 2018 Show Abstract The necessity to maintain the quality indicators of electricity supply, DEC(Equivalent Duration of Interruption per Consumer Unit) and FEC (EquivalentFrequency of Interruption per Consumer Unit), both required by ANEEL (NationalAgency for Electric Energy) has never been so imperative for the electric powerutilities companies. Year after year these indicators become increasinglydemanding. Besides, in a natural way, the electrical system only tends to growand become more complex, consequently bringing more technical challenges tothe Protection, Operation and Maintenance (O & M) areas of DistributionNetworks (DN). A Distribution Network, also known as a feeder, when showscharacteristics such as small dimension, densely charged and with a high level ofshort-circuit current in the substation busbar (SS), is an example of challengingcondition to ensure coordination and selectivity between the circuit protectiondevices. This panorama is especially difficult for the protection when there is aconsumer of Group A (e.g. 13.8 kV) connected at the end or near the end of thistype of feeder. With the significant investments made in recent years by electricpower utilities for the acquisition and installation of reclosers (RL) in the DNs, inpractice, the number of reclosers operating only as a sectionalising switch(SECC) and not as a recloser or even as a circuit breaker, has also been growing.This "sacrifice" occurs mainly in cases where there is no coordination for phaseovercurrent (ANSI functions 50/51), once for the earth/ground faults it can beassumed that there will always be coordination (ANSI 50N/51N functions). Thisresource is satisfactory for simple configurations of the RL-SECC type, however,it has major drawbacks when it involves two or more consecutive (or serial)SECCs in the feeder. Considering this scenario and the sophistication of thecurrent protection relays used in the control cubicles of the reclosers, this workproposes a solution to the coordination and selectivity problem by making use ofthe logic programming resources in the relays, transforming the recloser into ahybrid device. This way, it operates as RL or SECC depending on the type ofshort circuit. The hybrid recloser, in addition to operating as a dual behaviordevice (RL / SECC), optimizing the use of this asset in the network, does notrequire any change in the device protection setting upstream (recloser or circuitbreaker), nor does it depend on communication. In addition, it allows theautomatic self-healing of healthy stretches, in line with safety practices (it doesnot increase the number of reclosing (ANSI function 79) of the upstream devices,it can be activated and deactivated locally or remotely, etc.), moreover being aconcept not oriented to a specific recloser manufacturer. It is hoped, with thiswork, to bring a new perspective to the area of study of protection of electricpower utilities companies and significant contribution with new practices ofprotection settings and the operation of reclosers in DNs.
8	ALDRIN BEZERRA DIAS PROJECT OF IMPLANTATION OF FLEXIBLE PHOTOVOLTAIC SOLAR CELLS IN FIBROCIMENT TILES Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : RICARDO FERREIRA PINHEIRO JOSE LUIZ DA SILVA JUNIOR GABRIEL IVAN MEDINA TAPIA NEILTON FIDELIS DA SILVA Data: Jul 31, 2018 Show Abstract In view of the growing dependence on the use of electricity, and in compliance with national resolutions regulating micro and small-scale installations from renewable sources, especially since the roof is an essential element of a building, which guarantees the right Of housing - fundamental right enshrined in the Federal Constitution of 1988 - providing human beings physical and emotional security necessary for survival, this work proposes a prototype assembly with elements already used in photovoltaic modules of mono and polycrystalline silicon to analyze the performance of cells Flexible photovoltaic solar cells of the second generation in fiber cement roofing tiles, for electric power generation. The fiber cement tiles cover 49% of the buildings in Brazil, being the cost an attractive factor for their use. Flexible photovoltaic solar cells, in turn, also present themselves at low cost due to manufacturing techniques. Thus, after assembly, tests and project design, which will define, among other factors, the appropriate treatment of typical technical issues, such as the inclination to obtain maximum power, proposing solutions of connections and electrical and mechanical protections, it is intended To verify the level of electricity cost and to complete the viability analysis of the whole process for the proposed prototype, aiming to present a sustainable and energy efficient product, being able to be a solution of generation of electricity at a low cost in government housing programs for the population Of low income - for example "My House My Life", agricultural sheds, among several other applications.

2017

	Dissertations
1	DIEGO DEYVID DANTAS DE MEDEIROS SOFTWARE DEVELOPMENT FOR OPTIMAL LOAD ALLOCATION ON DISTRIBUTION NETWORKS WHITH DISTRIBUTED GENERATION Advisor : MAX CHIANCA PIMENTEL FILHO COMMITTEE MEMBERS : MANOEL FIRMINO DE MEDEIROS JUNIOR MAX CHIANCA PIMENTEL FILHO UBIRATAN HOLANDA BEZERRA Data: Jan 5, 2017 Show Abstract Currently, with the increasing incentive to use alternative and renewable energy sources, the number of generators connected to the electricity distribution networks has increased. Among them are, for example, wind farms, photovoltaic solar energy systems and cogeneration systems forming the so-called Distributed Generation. In view of this global panorama, it is imminent the need to develop new technologies and computer programs that allow the optimization of the connections of generators in the electrical system. This should be done in such a way that, among other advantages, control strategies are improved and efficiency increased. This work presents the creation of Optimal-GeDist software, developed to assist in the planning of electricity distribution networks in medium voltage. This computational tool calculates optimum power injection of the distributed generation in the network bars, in addition to determining the best connection points of future loads that wish to connect to the system. Because it is a problem, in which search space is broad and with the possibility of local minimums, it was decided to use the Genetic Algorithm as an optimization tool, more suitable for this type of problem. Through its application, is possible to find the optimal point of operation of the network in order to optimize the technical losses of the system. For the simulation of the system, we opted for the Power Sum load flow method, developed for medium voltage radiated systems and presenting a fast and accurate convergence.
2	LEONARDO DUARTE DE ALBUQUERQUE System of Connection and Supervision of Solar Panels in Microgrid of Continuous Current. Advisor : JOSE ALBERTO NICOLAU DE OLIVEIRA COMMITTEE MEMBERS : JOSE ALBERTO NICOLAU DE OLIVEIRA PAULO VITOR SILVA RICARDO FERREIRA PINHEIRO Data: Jun 23, 2017 Show Abstract The scarcity of natural resources and the search for alternative energysources promote a rapid change in the global energy matrix. Among the renewableenergy sources solar energy is the most promising, since it has the highestgrowth rate at present. Researchers around the world have sought ways of enablingtheir progress, developing technologies with greater efficiency and lower cost. Asa contribution to the advancement of this technology, this document proposes thedevelopment of a microgrid in continuos current connecting the photovoltaic panelsthrough a device with tracking strategy developed based on the method perturbationand observation that will advise the electronic circuit power and a wirelesscommunication system for monitoring of individual generation. Simulations havebeen developed for to choice of connection topology and comparison between theproposed and traditional control method, assigning different input levels and graphicallychecking the output responses. With the design and development of the circuits,firmware and printed circuit board of the proposed device, it was possibleto carry out experiments to verify its capacity of energy conversion and to verifyresponses of control methods mentioned above, placing it as an viable option andadding a small contribution to technologies of embedded system in the of renewableenergy field.
3	JONATHA REVOREDO LEITE DA FONSÊCA xx Advisor : ARRHENIUS VINICIUS DA COSTA OLIVEIRA COMMITTEE MEMBERS : ARRHENIUS VINICIUS DA COSTA OLIVEIRA MANOEL FIRMINO DE MEDEIROS JUNIOR MARCOS ANTONIO DIAS DE ALMEIDA RENATO MACHADO MONARO Data: Jul 6, 2017 Show Abstract xxx
4	MAURICIO JOSE DO NASCIMENTO JUNIOR Supervisory System for Management, Standardization of the Facilities and Feasibility Study of Using Diesel Generator Groups in Rush Time in UFRN Advisor : ALDAYR DANTAS DE ARAUJO COMMITTEE MEMBERS : ALDAYR DANTAS DE ARAUJO ALDAYR DANTAS DE ARAUJO JUNIOR ARRHENIUS VINICIUS DA COSTA OLIVEIRA JOSE LUIZ DA SILVA JUNIOR Data: Jul 26, 2017 Show Abstract The pursuit of distributed power generation has become a constant in the contemporary world. The consumption of electricity and all spending related to this necessity are frequently themes of issues in the most miscellaneous areas of knowledge. Power saving is a reality not only around private institutions. The UFRN has lived a transition moment in which it has stopped having its electricity supply through two inputs of electricity at 13,800 V and it has started to be supplied through a single line of 69,000 V. This simple change means a significant reduction in the power invoices. Linked to this new infrastructure, the University has implemented a system of supervision, measurement and billing of the energy which will be charged to each department. It makes the power substations to manage these units to use energy more rationally. In this perspective, this work is a research hint, about a technical-economic view which analyzes the load profile of one of the Departments - Bioscience Center - and then a comparative analysis in the working of a generator set out of the rush time - hours of the day when electricity is more expensive. This will be yet another attempt for power reductions by department and the use of idle installed capacity of generators with poor routine of maintenance. The proposal also includes a standardization in the installations of such equipment, the creation of a supervisory system (SCADA) capable of accessing these generator sets for better data management and daily operation of these generators.
5	STEFERSON ALMEIDA ADERALDO DEVELOPMENT OF SOFTWARE FOR SIZING OF INSULATED CABLES OF WIND FARMS, WHEREAS TECHNICAL AND ECONOMIC CRITERIA Advisor : CLOVIS BOSCO MENDONCA OLIVEIRA COMMITTEE MEMBERS : CLOVIS BOSCO MENDONCA OLIVEIRA ARRHENIUS VINICIUS DA COSTA OLIVEIRA JOSE LUIZ DA SILVA JUNIOR CARLOS GOMES DE MOURA Data: Jul 28, 2017 Show Abstract In Brazil there are 794,699 km of networks and only 12,348 km are of underground networks, that is, less than 2%, and the others are from overhead electricity distribution networks. However, it is estimated that about 30% of the total wind farms in operation, that is, more than 3,000MW were built using underground networks. The proper sizing of these networks is of fundamental importance for correct functioning and guarantee of return of investments. Current projects and computer programs for project support take into account only criteria for conduction, voltage drop and / or loss of energy. This is because the initial costs are lower, but for all lifecycle of the wind farm the losses and operating costs can be much higher, reducing profits in other years. Besides that, this type of network has a high cost and the need to maintain high levels of reliability and operation for its use, it is necessary to develop more tools for proper sizing to ensure optimum resource allocation and operational efficiency, By reducing operational costs, increasing the useful life, as well as avoiding loss of revenue due to lost profits. The objective of the present work is to analyze the main technical and economic criteria for the design of medium voltage underground networks in wind farms aiming at cost optimization throughout life, as well as the development of a computer program that allows integrating the technical and economic tools, with a specific methodology based on norms for the adequate dimensioning
6	SÉRGIO GOMES CAVALCANTE Embedded System for Monitoring Auxiliary Circuits in Power Circuit Breake Advisor : JOSE ALBERTO NICOLAU DE OLIVEIRA COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO JOSE ALBERTO NICOLAU DE OLIVEIRA RAFAEL NUNES DE ALMEIDA PRADO Data: Jul 28, 2017 Show Abstract The Electric Power System model introduced in Brazil in the late 1990s produced a scenario with a high regulation level. The Agência Nacional de Energia Elétrica (ANEEL) creation and its rules force the agents involved in that system to always seek the low tariffs with a high quality level of service and product quality. The requirements imposed on Brazilian Power Utilities result in the development of processes that allow a continuous improvement. Nevertheless, these strategies are not always sufficient to ensure good quality indicators. Many times, the processes do not hold a perfect synchrony to the point of avoiding execution failures. Other times, the failures are not in the processes, but in the equipment that are objective of the existence of the processes. As an example the preventive maintenance schedules that are developed in certain equipment of a Substation. Another example, unscheduled failures to be corrected is necessary that the correct information, scroll through the channels of communication to quickly and accurately reaching those responsible for maintenance. Correct information does not always reach the department quickly and accurately, but it is stored and cataloged for future analysis. This work aimed to reduce the DEC (Equivalent Duration of Interruption per Consumer Unit) indicator, improvement in maintenance planning and increase in the electrical installations’ s safety level in a substation. By building an embedded system designed to monitor the main internal components of a circuit breaker. With the results achieved, it is concluded that the device provided in the project meets the objectives imposed, being able to perform its functions with speed and assertiveness in the data generated. The integration of this equipment into the circuit-breakers will allow anticipating the failures making the electrical system more reliable and safe
7	MARCOS ANTONIO ALVES DA SILVA DEVELOPMENT OF AN APPLICATION USING THE QR CODE TO ACCESS A MANAGEMENT SYSTEM FOR THE MAINTENANCE OF ELECTRICAL DISTRIBUTION INSTALLATIONS Advisor : JOSE LUIZ DA SILVA JUNIOR COMMITTEE MEMBERS : JOSE LUIZ DA SILVA JUNIOR JOSE TAVARES DE OLIVEIRA MARCOS ANTONIO DIAS DE ALMEIDA HUMBERTO DIONISIO DE ANDRADE Data: Aug 11, 2017 Show Abstract It is noticeable that, for some time, society has been undergoing a process of information organization in its practices and procedures, providing significant advances for communication and data storage, raising in the public and private institutions the awareness of the need for continuous adaptation and improvement as it concerns the treatment of their processes. Within this context, we introduce a proposal to draw up an electric maintenance plan on whose stakeholders enjoy a systematic approach focused on preventive maintenance, based on the management of information of all elements of the electrical energy system. Accordingly, starting from the analysis of the most modern techniques of electric maintenance management, we can define one that better fits the reality of the electric power system of the Federal University of Rio Grande do Norte – UFRN, thereby drawing up a case study through the development of a management system based on the registration of all its elements, whose content gathers the aspects related to the generation of inspection reports, corrective and preventive maintenance, and registration of technical data on the electric equipment, building a database structured in ACCESS accessible by means of QR code in the places where the equipment will be installed.
8	FRANCLIN RÓBIAS DA SILVA JÚNIOR PROJECT OF BALANCING ELECTRICAL LOADS IN INSTALLATIONS WITH MULTIPLE ELECTRICAL DISTRIBUTION BOARDS BASED ON AN EVOLUTIVE HEURISTICS Advisor : CRISLUCI KARINA SOUZA SANTOS CANDIDO COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO JOSE LUIZ DA SILVA JUNIOR MANOEL FIRMINO DE MEDEIROS JUNIOR PAULO VITOR SILVA Data: Sep 15, 2017 Show Abstract This work proposes an alternative to load balancing in an electrical installation, applying optimization technique based evolutionary heuristic. The developed code will be used to plan the redistribution of electric charges in the Rectory of the Federal Institute of Education, Science and Technology of Rio Grande do Norte (IFRN). The main objective is to develop a technical project to improve the balance of electrical loads of the building, reducing losses and increasing efficiency, at the same time favoring the quality of the energy in the installation.
9	MARIANA DANTAS E VIANA TECHNICAL PROJECT FOR THE RECONFIGURATION OF MEDIUM VOLTAGE FEEDERS OF 13.8 KV OF THE COSERN UTILITY, BASED ON TRANSFER OF LOADS AND ON CONTINUITY INDICATORS Advisor : JOSE LUIZ DA SILVA JUNIOR COMMITTEE MEMBERS : JOSE LUIZ DA SILVA JUNIOR MANOEL FIRMINO DE MEDEIROS JUNIOR MAX CHIANCA PIMENTEL FILHO HUMBERTO DIONISIO DE ANDRADE Data: Sep 15, 2017 Show Abstract Constantly, electric utilities are being audited by the regulator to improve the indicators of continuity and quality of services provided to their consumers. In view of this, energy distributors constantly invest in the improvement of energy distribution networks, such as the installation of remote control devices for the automatic reconfiguration of the circuits in the event of a defect in the network fed to consumers, who are fastened to the system observing the operational conditions circuits. In this scenario, this work proposes a project that aims to improve the indicators of continuity of an electrical assembly of the company COSERN, through automatic reconfiguration, after indications of specific points in the network of automated devices.

2016

	Dissertations
1	ALFREDO RODRIGUES DE LIMA Indicador de Inconformidades em Instalações Elétricas de Baixa Tensão Advisor : CRISLUCI KARINA SOUZA SANTOS CANDIDO COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO MANOEL FIRMINO DE MEDEIROS JUNIOR MAX CHIANCA PIMENTEL FILHO Data: Jan 28, 2016 Show Abstract Com o avanço da tecnologia de equipamentos, das formas de geração e utilização de energia, os parâmetros de qualidade de energia passam a influenciar de forma mais expressiva os diversos tipos de cargas consumidoras. Atualmente, são muitos os tipos de equipamentos que analisam a qualidade de energia. Entretanto, existe a necessidade de criar dispositivos que, além de realizar medições e calcular parâmetros, encontrem falhas, sugiram alterações, e possam dar suporte ao gerenciamento da instalação. Além disso, é necessário garantir que tais dispositivos sejam acessíveis. Para manter esse equilíbrio, deve ser utilizado um método de medição de grandezas que não requeira grandes recursos de processamento ou de memória. O trabalho mostra que aplicação do algoritmo de Goertzel, em comparação com a comumente utilizada FFT, permite que as medições sejam feitas utilizando menos recursos de hardware, disponibilizando espaço na memória para implementação de funções de gerenciamento. O ponto inicial do trabalho consiste na pesquisa dos distúrbios que são mais frequentes para consumidores de baixa tensão. Em seguida é proposto o diagrama funcional que indicará o que será medido, calculado, quais problemas serão detectados e que soluções podem ser encontradas. Simulando o algoritmo de Goertzel através do Scilab, mostra-se que é possível calcular componentes de frequência de um sinal distorcido com resultados satisfatórios. Finalmente, é montado o protótipo e são realizados os testes, ajustando os parâmetros necessários para que se consiga manter o dispositivo confiável sem aumentar seu custo.
2	DELSON ALVES DA COSTA PROJETO DE UM SISTEMA HÍBRIDO DE GERAÇÃO DE ENERGIA ELÉTRICA CONECTADO À REDE, INCLUINDO O REGULADOR ELETROMAGNÉTICO DE FREQUÊNCIA-REF Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : RICARDO FERREIRA PINHEIRO CLOVIS BOSCO MENDONCA OLIVEIRA MANOEL FIRMINO DE MEDEIROS JUNIOR PAULO VITOR SILVA Data: Apr 28, 2016 Show Abstract O presente projeto foi pensado em função da utilização do potencial dos recursos naturais, mais especificamente sol e vento, existentes no Rio Grande do Norte, para a geração de energia elétrica através de um Sistema Híbrido de Geração de Eletricidade - SHGE conectado à rede COSERN, composto por um arranjo de painéis fotovoltaicos e uma turbina eólica incluindo o Regulador Eletromagnético de Frequência-REF. Para tanto, foi escolhido o Campus da Cidade de Macau, em função do espaço físico disponível na unidade acadêmica da Universidade Federal do RN e das características favoráveis de sol e de vento do município. A partir dos dados de irradiação solar, velocidade de vento, curva de carga, e de especificações de turbinas eólicas, de painéis fotovoltaicos e de baterias, com a utilização do software Scilab, versão 5.5.2, chegou-se a uma combinação de equipamentos para atender a demanda do Campus. Literatura técnica específica, normas e trabalhos acadêmicos foram consultados na busca por uma solução satisfatória para o projeto, valendo salientar que a ideia foi priorizar as fontes renováveis, e que, apesar de ser um sistema conectado à rede, a alimentação da unidade consumidora pela COSERN e pelo gerador diesel são consideradas situações de exceção. O projeto é constituído por cinco plantas, memorial descritivo e relação de material, a ser registrado no Conselho Regional de Engenharia e Agronomia do RN – CREA-RN como trabalho acadêmico.
3	HUDSON DA SILVA RESENDE DESENVOLVIMENTO DE SOFTWARE NA PLATAFORMA NI-LABVIEW PARA RECONHECIMENTO E IDENTIFICAÇÃO AUTOMÁTICA DE PARÂMETROS DE CONTROLE DE AEROGERADORES UTILIZANDO DADOS OPERACIONAIS Advisor : MANOEL FIRMINO DE MEDEIROS JUNIOR COMMITTEE MEMBERS : MANOEL FIRMINO DE MEDEIROS JUNIOR JOSE ALBERTO NICOLAU DE OLIVEIRA JOSE TAVARES DE OLIVEIRA MELINDA CESIANARA SILVA DA CRUZ Data: Apr 29, 2016 Show Abstract Atualmente, existe a dificuldade na obtenção de dados para simulação do comportamento dinâmico de parques eólicos, para avaliar o seu impacto na operação do sistema elétrico ao qual se interligam. Sob o pretexto de conservar segredos industriais (Propriedade Intelectual), valores de parâmetros como constantes de tempo de máquinas e dos sistemas de controle, frequentemente não são disponibilizados, para a realização de estudos que, são muitas vezes realizados com valores de referência para esses parâmetros, ou através de ajustes teóricos, para reproduzir o desempenho esperado em algumas situações operacionais, como por exemplo, a boa resposta na partida. Depois de realizada a conexão dos parques eólicos, estudos de impacto devido ao comportamento dinâmico decorrente de perturbações, continua sendo necessários, para a avaliação e confirmação das condições de operação do sistema. A fim de verificar a influência do parque na operação do sistema, costuma-se instalar equipamentos de medição de qualidade de energia elétrica nos pontos de interligação, de maneira que os efeitos de perturbações nas grandezas elétricas ficam registrados e podem ser disponibilizadas para “análise pós-despacho”. Esses dados, associados a medições de vento podem ainda ser utilizados para alimentar um algoritmo de identificação de parâmetros, a fim de estimar os valores das constantes de máquinas e dos ganhos dos sistemas de controle admitidos nos modelos dos aerogeradores, de acordo com a tecnologia empregada. Este trabalho visa desenvolver um Software na Plataforma NI-LabView para reconhecimento e identificação automática de parâmetros de controle de Aerogeradores (Aqui denominado de SidPA 1.0), utilizando dados operacionais de um aerogerador de velocidade variável, com tecnologia síncrona, a partir da aquisição, tratamento e avaliação dos dados em um equipamento de medição de qualidade de energia elétrica e anemometria, com realização discreta no tempo, e plataforma com base em processador digital de sinais.
4	RODRIGO AUGUSTO DO NASCIMENTO GOMES DESENVOLVIMENTO DE SOFTWARE PARA DETERMINAÇÃO ÓTIMA DE PONTOS DE CONEXÃO DE GERADORES EM REDES DE DISTRIBUIÇÃO ATRAVÉS DE UM ALGORITMO GENÉTICO COM SUPORTE DE GRADIENTE EM ÁRVORE Advisor : MANOEL FIRMINO DE MEDEIROS JUNIOR COMMITTEE MEMBERS : MANOEL FIRMINO DE MEDEIROS JUNIOR CLOVIS BOSCO MENDONCA OLIVEIRA JOSE LUIZ DA SILVA JUNIOR MAX CHIANCA PIMENTEL FILHO PAULO VITOR SILVA Data: Apr 29, 2016 Show Abstract A conexão de gerações pode trazer benefícios para a rede elétrica, inclusive postergando investimentos financeiros pelas distribuidoras. Para isso, ferramentas de estudo são necessárias. Perdas elétricas, apesar de serem indesejadas, são inerentes a toda rede de distribuição de energia elétrica e para diminuí-las, investimentos em obras na rede são necessários. A conexão de gerações, desde que previamente estudadas, poderá otimizar essas perdas da rede e provocar melhora no nível de tensão. Esse trabalho apresenta uma ferramenta computacional que foi desenvolvida para auxiliar as empresas nas estratégias de redução de perdas, em princípio sem a necessidade de investimentos na rede. A ferramenta utiliza dois métodos de otimização e um método de fluxo de carga apropriado para redes de distribuição. A utilização conjunta dos dois métodos de otimização mostrou-se uma boa estratégia implementada em software para estudo e tomada de decisões na conexão de geradores. São feitas simulações utilizando dados de redes da COSERN e são mostradas graficamente as melhorias obtidas nos níveis de tensão e na redução das perdas. Também é feita uma avaliação no tempo de execução do programa e no desempenho das linguagens de programação utilizadas. No final são apresentadas algumas sugestões de trabalhos futuros utilizando a filosofia do software desenvolvido.
5	RENAN MACIEL MIRANDA Large-Scale Onshore Photovoltaic Power Plant in Brazil. Advisor : CLOVIS BOSCO MENDONCA OLIVEIRA COMMITTEE MEMBERS : CLOVIS BOSCO MENDONCA OLIVEIRA MANOEL FIRMINO DE MEDEIROS JUNIOR RICARDO FERREIRA PINHEIRO RENATO SAMUEL BARBOSA DE ARAÚJO Data: Sep 20, 2016 Show Abstract The solar projects developed in Brazil, for being relatively new, still face difficulties in relation to the processes and project care that should be taken to it's consolidation, since there aren't sufficiently complete bibliographic references that address the project development stages of large solar power plants (over 5 MW) in the country. In this scenario, this paper proposes an flowchart of services for the development of photovoltaic power plant project in Brazil, considering the bureaucratic processes that must be taken by the appropriate bodies in order to obtain permits, licensing and electrical connection permissions, as well as expose tools and design process steps commonly taken by companies in the sector. Finally, a technical project will be presented proving the implementation of the previously discussed methodology, with the development of memorial, layout and single-line diagram. Thus, it's expected that the work will serve as a good role model for deployment of photovoltaic plants in large scale in Brazil by exposing steps, knowledge and appropriate skills that make the project development process of this power source more simplified, fast and effective, serving, therefore, as reference for professionals and companies looking to invest and/or gain knowledge in this sector which, every day, is gaining more competitiveness in the Brazilian market.
6	LEANDRO RIBEIRO ALVES DA SILVA PREVCONFI PROGRAM: RELIABILITY APPLIED IN THE PREVENTIVE MAINTENANCE OF WIND FARMS WITH A FOCUS ON MINIMIZATION OF COST. Advisor : RICARDO FERREIRA PINHEIRO COMMITTEE MEMBERS : RICARDO FERREIRA PINHEIRO JOSE LUIZ DA SILVA JUNIOR MANOEL FIRMINO DE MEDEIROS JUNIOR NEILTON FIDELIS DA SILVA Data: Dec 27, 2016 Show Abstract This job makes the assessment of the wind turbine components with the biggest number of failure rate within all the wind turbine sectors using the wind farm historical operational data. After identifying those components, a more adequate maintenance routine will be planned for those components in order to avoid unexpected failures and consequent financial loss by the lack of energy generation. The proposed routine will have the focus on minimizing the maintenance costs followed by a natural availability increase, also increasing the energy generation. The job will have the reliability study as a basis to be applied to the maintenance. The Weibull Distribution was applied as the probability distribution for this case study. The schedule of maintenance is prepared by a program created in Microsoft Excel that is based on past experiences and occurrences of a specific wind farm, feeding the program with new data in order to re schedule the maintenance schedules in the most appropriate timing for the analyzed systems. Components able to become the wind turbine unavailable in generating energy will be considered as critical components and therefore they will have their maintenance schedule optimized based on costs and observed the respective failure probability which is different from the current maintenance routines that are not dedicated for the wind farms but generalized for any one. The current contracted preventive maintenances are performed time to time and they are not taking into account the criticality of some components Maintenance suppliers are only committed to deliver a minimum availability rate, but without contractual responsibility with energy generation. Also is part of this job, show to the wind farm owners and maintenance suppliers how much is important a Reliability assessment in order to obtain a bigger financial return by minimizing the maintenance costs and improving energy generation based on an adequate maintenance schedule for each specific wind farm.

2015

	Dissertations
1	WAGNER JOSE NASCIMENTO DE OLIVEIRA PROJETO DE FILTROS PASSIVOS PARA A REDUÇÃO DE CORRENTES HARMÔNICAS NA SUBESTAÇÃO DE 2X300 KVA DA ESTAÇÃO ELEVATÓRIA DE ÁGUA DO JIQUI. Advisor : CRISLUCI KARINA SOUZA SANTOS CANDIDO COMMITTEE MEMBERS : CRISLUCI KARINA SOUZA SANTOS CANDIDO ARRHENIUS VINICIUS DA COSTA OLIVEIRA JOSE TAVARES DE OLIVEIRA MAX CHIANCA PIMENTEL FILHO Data: Jun 3, 2015 Show Abstract Trata-se de um caso prático visto na indústria de saneamento em que se observaram parâmetros de qualidade de energia elétrica utilizando medidores de grandezas elétricas durante as manutenções preditivas realizadas na Companhia de Águas e Esgotos do Rio Grande do Norte (CAERN). Foram constatadas correntes harmônicas em desconformidade com as normas, causadas pelo acionamento dos motores por meio de inversores de frequência. Para a solução do caso, este trabalho de conclusão de Mestrado apresenta o projeto de filtros harmônicos passivos em sintonia única a serem instalados em paralelo nos terminais de baixa tensão de cada um dos transformadores de 300 kVA da subestação que fornece energia elétrica para a Estação Elevatória de Água Bruta (EEAB) do Jiqui, da CAERN, principal captação de água de Natal-RN. Os equipamentos promovem a redução das distorções harmônicas de corrente para os níveis tolerados nas Normas IEC (International Electrotechnical Commission) 61000-3-4 e IEEE (Institute of Electrical and Electronic Engineers) 519. O sistema é modelado desde a subestação da concessionária até as cargas energizadas pela subestação da CAERN e simula a operação dos filtros de 5ª, 7ª, 11ª e 13ª ordens de forma isolada e também interligada, obtendo as respostas para as implementações feitas para os diferentes fatores de qualidade. São avaliadas as novas harmônicas de corrente e tensão para cada frequência, bem como o comportamento do sistema na frequência. Observam-se as ressonâncias em série dos filtros sintonizados e também as ressonâncias paralelas, sendo utilizada para tal a ferramenta computacional HARMZS, versão 1.8, desenvolvida pelo Centro de Pesquisas de Energia Elétrica – CEPEL. Para as simulações das correntes e tensões é usado o programa SCILAB, versão 5.5.1.
2	MARCEL DA COSTA FONTES Projeto de plataforma didática compatível com a norma IEC61850 para comissionamento de sistema digital de controle e proteção de subestação de energia elétrica. Advisor : MARCOS ANTONIO DIAS DE ALMEIDA COMMITTEE MEMBERS : MARCOS ANTONIO DIAS DE ALMEIDA ARRHENIUS VINICIUS DA COSTA OLIVEIRA MANOEL FIRMINO DE MEDEIROS JUNIOR MELINDA CESIANARA SILVA DA CRUZ Data: Oct 23, 2015 Show Abstract O estabelecimento da norma IEC61850 e a sua imersão no setor de energia elétrica nacional, na última década, revelou uma tendência real de mercado. A necessidade de padronização dos sistemas de proteção & automação das subestações e a preocupação com a segurança da informação estimularam essa transição. Os dispositivos microprocessados agora são denominados de dispositivos inteligentes IED (Intelligent Eletronic Device). Eles executam funções de proteção & controle integradas, tendem a assumir um caráter multifuncional agregando várias funcionalidades (controle, proteção, medição e comunicação), utilizam e executam algoritmos de proteção consagrados pelas normas ANSI e IEC. Sua comunicação é baseada em protocolos de alta velocidade como GOOSE(Generic Substation Events), MMS(Manufacturing Message Specification) e SMV(Sample Measure Value) executados através de redes TCP/IP Ethernet e definidos por linguagem SCL (linguagem de configuração de sistemas), apresentam capacidade para aquisição de dados analógicos e digitais e placa de rede ethernet. Este trabalho tem como objetivo desenvolver uma plataforma de testes protótipo, LabProt, e seus materiais didáticos, com propósito de disseminar conhecimentos das aplicações de Proteção em IEC61850 para cursos de graduação, pós-graduação e profissionais do mercado, contribuindo assim para qualificação dos profissionais de engenharia elétrica das próximas gerações. Esta plataforma proporcionará uma infraestrutura para configurar, testar e comissionar sistemas de proteção e automação de subestações regidas pela norma IEC61850. A metodologia utilizada será o estudo de múltiplos casos, com testes em bancada de aplicações práticas, em nível de subestação. Serão discutidas neste trabalho as arquiteturas de comunicação, especificações dos equipamentos, testes de conformidade, testes funcionais de proteção em bancada com o auxílio de caixa de teste de proteção, relés de proteção Micom Schneider, switch gerenciável Ruggedcom e da infraestrutura de rede da UFRN.