“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 and
potential impacts throughout the life cycle of a photovoltaic solar plant. For this, a Life
Cycle Analysis (LCA) study was developed. Given this scenario, knowing that the
Federal University of Rio Grande do Norte (UFRN), as a public teaching institution that
plays 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).”

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.

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.

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 is
necessary to carry out a study of energy generation expectations. In this scenario, this paper
proposes the analysis of a technology that has been applied in recent years to increase
the efficiency of photovoltaic plants, called by bifacial modules, approaching the main
points to be discused in the simulation and application of these modules in large power
plants.A methodology for calculating energy losses from a photovoltaic plant to the point
of injection was developed, through the calculation of hourly losses, and, as an input database
for this simulation, an array of simulated photovoltaic inverters was performed in
PVsyst software. Finally, the sizing of the main equipment of a photovoltaic plant using
bifacial modules and the simulation of this plant are presented, proving the application
of the methodology previously discussed. In this way, it is expected that the work will
serve as a reference model for possible simulations of photovoltaic plants using bifacial
modules, as well as for the study of the generation expectation of a large photovoltaic
plant.

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.

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.

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.

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.

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.

The production of electric power constitutes a major part of the economic growth plan
of any nation. Relative to other nations, Brazil possesses key advantages since the
design of its energetic matrix can be based on abundant renewable sources. One such
source, the focus of this work, is the biomass of the sugar cane, which is used in the
cogeneration of power that strengthens the Brazilian matrix. Although long available,
note that this source of energy has been underutilized in the commercial production and
distribution of electric power. The Program for the Incentive of Alternative Energy
sources (Programa para of Incentivo `as Fontes Alternativas de Energia, PROINFA),
established by the Federal Government in 2002, but extinct today, and the rise of market
for carbon credits triggered by the Kyoto Protocol, improved the situation in the last
decade. Indeed, during this period, the sugar-cane biomass has been used more
intensely, emerging as an important component of the Brazilian energetic matrix. This
dissertation analyzes data related to the harvest/milling and the amount of electric power
exported from a sugar-cane alcohol based thermoelectric plant that sells electric power
in an environment of regulated contraction (ERC) and in an environment of free
contraction (EFC), which is derived from sugar-cane bagasse. It was verified that using
the bagasse as the sole source of fuel, it was not possible to supply the yearly amount of
power 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 power
production at the end of the cycle. It is concluded that the combined bagasse-straw used
as 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 of
electric power.

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.

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.

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.

The scarcity of natural resources and the search for alternative energy
sources promote a rapid change in the global energy matrix. Among the renewable
energy sources solar energy is the most promising, since it has the highest
growth rate at present. Researchers around the world have sought ways of enabling
their progress, developing technologies with greater efficiency and lower cost. As
a contribution to the advancement of this technology, this document proposes the
development of a microgrid in continuos current connecting the photovoltaic panels
through a device with tracking strategy developed based on the method perturbation
and observation that will advise the electronic circuit power and a wireless
communication system for monitoring of individual generation. Simulations have
been developed for to choice of connection topology and comparison between the
proposed and traditional control method, assigning different input levels and graphically
checking the output responses. With the design and development of the circuits,
firmware and printed circuit board of the proposed device, it was possible
to carry out experiments to verify its capacity of energy conversion and to verify
responses of control methods mentioned above, placing it as an viable option and
adding a small contribution to technologies of embedded system in the of renewable
energy field.

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.

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

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.

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.

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.

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.

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.