Engenharia Elétrica (UACSA)

URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2922

Siglas das Coleções:

APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso

Navegar

Agora exibindo 1 - 9 de 9

Análise do impacto da geração distribuída sobre um sistema de proteção de sobrecorrente aplicado ao alimentador teste de 13 barras do IEEE
(2023-05-08) Silva Filho, Cláudio Paz da; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/1775969653837163
The constant growth in electricity consumption, combined with the need to use new forms of generation, brings great challenges to the traditional Electric Power System (EPS), a context in which the search for its modernization has been given by the development and implementation of energy sources. Distributed Generation (DG) and Intelligent Electric Networks, or Smart Grids. In this context, the main objective of the present work is the study and evaluation of the protection systems of energy distribution networks against the impacts of the connection and disconnection of distributed generators. Aiming at the development of the research, initially, a theoretical study was carried out to base the functioning and basic requirements of the protection systems. In addition, a study was carried out on distributed generation addressing the impacts caused by its connection to the grid, such as bidirectional power flow, overvoltage, level of voltage imbalance, etc. Together, the study and modeling of photovoltaic solar generation as a source of DG were carried out, in which real data from a photovoltaic module were used to validate all modeling. Still in the methodology, aiming to carry out simulations to analyze the behavior of the protection system against faults and the operating parameters of the distribution network after the insertion of distributed generation, the IEEE 13-bar test feeder and a timed overcurrent protection system was modeled in the SIMULINK/MATLAB® environment. Next, simulations of several test scenarios were carried out with variation in DG allocation with different power levels, in addition to the application of faults at different points in the network. Subsequently, possible strategies for improving network protection were addressed, addressing issues such as changes in the DG power factor, aiming to avoid overvoltages in the system, and the use of intelligent devices for a more assertive performance of the relays. Finally, it could be concluded that the work was successful in the research and studies proposed about the impacts on the protection system in distribution networks caused by the insertion of distributed generation, since, in 38.71% of the simulations, there was action of the protection equipment for the reverse fault.
Desenvolvimento de um procedimento para testes e análises de proteção em IED SEL-751A com auxílio da maleta de testes CE-6710 em ambiente industrial
(2024-06-07) Lima Júnior, Valdomiro Ferreira de; Araújo, Marcel Ayres de
Technological development has played a crucial role in the transformation of the Electrical Power System (SEP) and, consequently, in the industry, improving protection devices to ensure greater continuity and reliability for the supply of electrical energy to consumers. Intelligent Electronic Devices (IEDs) stand out as fundamental pieces in the protection of electrical systems from energy projections, as well as in substations and industrial plant installations, promoting automation and real-time monitoring, and offering functions from protection shifting to operational integrity. Considering the increasing complexity of electrical systems in industry, the implementation of robust procedures becomes necessary to maintain their integrity and the continuity of their processes, in addition to contributing to operational efficiency. Thus, the objective of this study is to contribute to the development of a protection testing procedure and parameter settings for IEDs used in the scope of applications for an industrial plant based on the IED SEL-751A, thus enabling an increase in reliability of the electrical systems, investigative analysis of possible operational problems of the device, and guarantee of operational safety, directly reflecting on productivity and industrial performance. To this end, the work proposes a gradual methodology to carry out tests on the IED SEL-751A, establishing its steps such as communication with the device, configuration using the CE-6710 case and parameter adjustments through the Conprove Test Center software in order to guarantee efficiency. and test security. This approach includes the 50/51 overcurrent test, with time and pickup analysis in relation to the protection parameters applied to the relay. Furthermore, a practical case study that occurred in the industry is presented, in which the procedure is applied to investigate an incident that occurred with a Siemens SIPROTEC relay, model 7SJ62, demonstrating the effectiveness and applicability of the principles outlined in this procedure not only for the SEL- 751A, but also for other devices. The test results are then detailed, including the protection curves and the data obtained for the fault simulations. These values are compared with the real and nominal values of each quantity demonstrated, determining whether the relay passes or fails for each fault scenario. missing, and certifying the functionality of the device.
Desenvolvimento de um protótipo de medidor de energia elétrica para aplicação em redes elétricas inteligentes.
(2022-10-12) Gomes, Clinton de Sousa; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/2029515617610539
Due to the increasing changes in the Electric Power System, new possibilities for the advancement of monitoring technologies have emerged and the concepts and methodologies brought by the smart electric grids have originated new tools and information for the concessionaires. For the implementation of an intelligent network, it is necessary to modernize the entire system, especially the measurement and monitoring techniques on the operation and operation of the network for access to more accurate and real-time data for all involved, enabling decision-making faster and thus increasing operational efficiency. In this context, the objective of this project is the study and development of a three-phase bidirectional electricity meter that makes it possible for the concessionaire to monitor, in real time, the electricity consumption of its consumer units. For this purpose, research was carried out to identify the operational characteristics and functionalities of smart meters in order to define the requirements of the system and the tools that are part of the project. To this end, the objective of this project was successfully achieved through the development of meter sensing systems using the ACS758 sensor and voltage transformers that allow the reading of electrical quantities, monitoring and communication through microcontroller ESP32, which enables the sending of data to be stored in a local database and displayed in a WEB interface. Based on the information gathered in the body of the document, a summary is made at the end of the work on the gain for the concessionaire by implementing a system such as the one proposed.
Especificação e simulação de um protótipo de medidor inteligente para monitoramento de energia elétrica em redes inteligentes
(2024-03-04) Sales, Alyson Lucas Ferreira; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/2489348703321990
As a result of the growing consumption of electricity in modern society, the gap between electricity supply and demand has been accentuated, generating an overload in existing electricity grids and an increase in energy production from non-renewable sources, which has a negative impact on the environment. These and other emerging challenges are in focus in order to adapt the generation, transmission and distribution electrical systems to the demands of this new consumption pattern, with renewable energy generation, distributed generation and information and communication technologies applied to metering systems as the main means of promoting the adaptation of the electrical system and paving the way for the creation of smart electrical grids. In this context, the main objective of this research is to develop a prototype smart electricity meter, so that a user with internet access can consult the information, in real time, of the measurements obtained by the equipment located in the field. It is worth noting that the information provided by the prototype must be bidirectional in terms of both power measurement and information flow, so that the equipment can send and receive information simultaneously and to distinguish the power flow to better suit applications in smart grids. During the development of the work, a bibliographical review was initially carried out to identify the crucial points in the operation of related equipment, such as: operational characteristics, signal processing method, communication protocols adopted and methods for collecting, storing and displaying data; in order to develop a prototype that maintains its contemporaneity in the face of growing technological advances in the area, and above all, with a focus on cost-effectiveness, with a view to its practical implementation resulting from future projects with improved versions. As a result of the work, the hardware and software parts of the prototype were designed. The hardware includes the power supply, the measurement method, the voltage and current signal conditioning system, the microcontroller and the communication protocol. The software part includes the type of database, the communication algorithm, an interface for consulting and making measured data available and the measurement algorithm.
Estudo de métodos para o dimensionamento do sistema de armazenamento de energia de um veículo elétrico tipo fórmula
(2024-03-05) Alves, Adriany Fabrícia Silva; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/3796261196279460
Faced with the need to reduce carbon dioxide emissions and increasingly reduce the fleet of gasoline vehicles, among other petroleum derivatives, in an attempt to mitigate the damage caused by pollution to the environment, the implementation of Electric Vehicles (EVs). They are a general concept of means of transport that takes advantage of the electric motor as the traction actuator, and one of the main types of EVs are those that use batteries as an energy storage system, also known as BEVs (Battery Electric Vehicles). BEVs are considered a solution that has the potential to mitigate greenhouse gas emissions and reduce the use of oil in the transport sector, avoiding energy crises. EVs present a technological evolution of transforming electrical energy into movement, which consequently has increased interest in electric propulsion for automobiles in recent years. They are designed to be competitive in terms of cost-benefit with conventional vehicles in the coming years. Given its importance, this work addresses a significant context of growth in the battery electric vehicle fleet in Brazil, from its technological characteristics, challenges, potential problems and benefits, through its energy transmission system, and its operating dynamics. After the theoretical foundations and all bibliographical references researched, the main objective is to study the sizing of this storage system aimed at BEVs applied to a formula-type EV. As a result, this study developed a detailed methodology for sizing formula-type vehicle power, force and energy, based on an in-depth analysis of the electric vehicle routing problem, exploring its different variants and possible solution approaches. Next, proceed to sizing the battery pack using a series-parallel configuration used to supply the ordinary power. Finally, the battery selection was carried out through MCDA statistical analysis using the AHP-Gaussian and AHP-Gaussian with Pearson Correlation method, resulting in the choice of the SLPBA096235 cell as the discovered technology, which declared nominal values in agreement and compatible with the main specificities related to formula-type EVs for the scaled system.
Estudo de viabilidade da implementação de um sistema de geração solar fotovoltaica on-grid em uma indústria
(2023-05-03) Freitas, Camyla Bárbara Bezerra de; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/2611819918991355
The Brazilian electric matrix is mostly composed of renewable energy sources, however, even with the growth of wind and solar generation, it is still extremely dependent on hydroelectric plants for the supply of electricity in the country. Large electricity consumers, especially industries, have the potential to contribute to the expansion of power generation, in view of the possibility of reducing their cost with the distributors. In this context, for the present work information was collected regarding the consumption of electricity in an industry in the city of Ipojuca for the development of an on-grid solar photovoltaic generation project. The various components of a project of this nature were studied, as well as the sizing and budgeting with a company of this specific segment. From the project sizing, a software simulation was performed in the chosen region, and added to the budget, the main indicators of technical and financial viability were obtained for the installation in the industry under analysis. Thus, the study shows the possibility of the existence of an industry with partially autonomous generation without major financial risks and that contributes to the expansion of the Brazilian electric matrix by using a renewable source.
Estudo dos principais aspectos de manutenção em sistema fotovoltaicos on-grid
(2021-03-04) Conrado, Deyvison Muniz; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/8030937685280342
The diversification of the Brazilian electric matrix represents a gain in reliability and availability of electricity. In this context, renewable energies have played an increasingly important role in the Brazilian energy sector. Photovoltaic solar energy, in particular, has grown considerably in recent years. One of the factors that contribute to the growth in the use of solar energy is the energy compensation system, which allows grid-connected photovoltaic plants to generate energy credits used for decreasing the bills of plant owners. Along with the increase of installations, there is also a growing demand for preventive and corrective maintenance for these systems. However, few professionals and integrating companies provide consistent maintenance plans for photovoltaic systems, or even know best practices for performing the proper procedures, which represents a problem of reliability, safety and profitability of these systems. In this sense, this work aims to discuss the maintenance of small grid-connected photovoltaic systems, commenting from the project up to the installation of the system, highlighting the relationship of these steps with some aspects of maintenance. Good preventive maintenance practices are described, as well as the relationship between plant maintenance and productivity. Finally, case studies are carried out, in which the importance of implementing appropriate procedures in the installation, operation and maintenance of photovoltaic systems can be assessed.
Modelagem de baterias de chumbo-ácido para sistemas de armazenamento de energia aplicáveis junto ao sistema elétrico de potência
(2022-10-11) Lima, Yuri Chaves de; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/0669410110930611
Energy storage systems have different forms and configurations, which can be electrical, thermal, energy resources or natural, which require an adequate mechanism for converting this stored energy. As it encompasses an extensive area of applications, studies of energy storage technologies have gained prominence, and their use in conjunction with the electrical system has intensified by making the supply of electrical energy more reliable, serving consumers more rationally. The increasing use of battery energy storage systems has driven new research on mathematical models representing the dynamic behavior of battery charge/discharge operation, with a focus on optimizing their energy resources. This work aims at the study and implementation of a mathematical model using computational tools to simulate the behavior of a lead-acid battery in view of the increasing insertion of energy storage together with distributed generation in the electrical system. Therefore, focusing on lead-acid batteries, mathematical models were researched taking into account their computational complexity, level of representativeness of the dynamic behavior of the battery, and accuracy of results. The Jackey model was selected because its equation was based on an electrical circuit aiming at the influence of fundamental parameters such as open circuit voltage, resistance, capacitance, battery charge state, and electrolyte temperature. From these computational implementations, as a result, the characteristic curves of the lead-acid battery were obtained, whose comparison with experimental curves presented an error smaller than 1%, evidencing the effectiveness of the method developed and implemented.
Procedimento para testes em sistemas de proteção de barras: arranjos barra dupla com disjuntor simples a quatro chaves
(2022-06-06) Lima, Thiago Lucas dos Santos; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/3741381872777674
Substation buses are of great importance for any electrical power system, as they are responsible for connecting various equipment, so a fault in the system can cause a great power outage. In this context, a testing methodology when implementing a new bar protection system can contribute significantly to ensure that the system operates satisfactorily, minimizing human error failures that can occur in the entire assembly or implementation process. of logics and giving reliability to the whole system. In this sense, this work presents a methodology for commissioning and integrating busbar protection systems for substations with double busbar arrangements with a single four-key circuit breaker. Therefore, the test steps to be carried out were described, detailing them for a better understanding of the reader and the possibility of practical application, such as the one carried out in 3 applications in energy substations. In these applications it was possible to identify failures that could cause serious problems, such as improper protection action and even non-operation when required.