Artigos em Conferências

This paper presents a comparison of the performance of squirrel cage induction motors (SCIMs) and permanent magnet motors (LSPMMs) under typical operating conditions. To that end, the effects of voltage unbalance and different rated load conditions are examined to determine the motors' performance and tolerance to disturbances. Results show that SCIMs demonstrate slightly higher tolerances to disturbances than LSPMMs in non-ideal voltage conditions, thus providing insight into their effectiveness in various applications. This comparison is crucial for a better understanding of motor performance and its implications for the design and operation of motors in certain operating conditions and regions.

ISAIAS FERREIRA, JONATHAN MUÑOZ TABORA, AYRTON LUCAS LISBOA DO NASCIMENTO, DANIELLY PRISCILA RIBEIRO CARRERA, MARIA EMÍLIA DE LIMA TOSTES, EDSON ORTIZ DE MATOS

Electric vehicles (EVs) offer a promising solution for urban mobility, providing a clean alternative for energy consumption and contributing to the reduction of CO2 emissions, which aligns with global environmental objectives. The growth of electric vehicles brings with it new challenges and restrictions for users in terms of active contracted power. In the face of these challenges, demand-side management studies are necessary to avoid criticalities in the grid for the concessionaires as well as penalties for exceeding the contracted demand for users with composite tariffs. This study evaluates the impacts of EV integration on the contracted demand of a medium voltage consumer, based on power flow studies monitoring the voltage at the busbars and the total power in the system. In this way, different charging scenarios are considered, as well as management strategies to optimize EV charging considering recharging criteria and restrictions to meet the defined power and voltage requirements. The results validate the proposed methodology for its use in the analyzed consumer.

GABRIEL A. M. MOREIRA, JONATHAN M. TABORA, THIAGO MOTA SOARES, M. E. DE LIMA TOSTES, UBIRATAN H. BEZERRA, CARMINDA C. M. DE M. CARVALHO

Power factor remains an issue of concern in today's industries due to the prevalence of inductive loads, the new technologies and electronics further aggravate this problem. This paper presents an evaluation study of the accuracy of the capacitor bank calculation method from the energy bill and billing period. In this way, the calculation is performed based on the energy bills of a year and compared with the database of a monitoring system. The results show that there may be errors and therefore penalties when considering a minimum desired factor, so that a higher power factor may be desirable according to the load characteristics.

AYRTON LUCAS LISBOA DO NASCIMENTO, DANIELLY P. RIBEIRO CARRERA, JONATHAN MUÑOZ TABORA, BRUNO SANTANA DE ALBUQUERQUE, MARCOS VINICIUS PEREIRA BRAGA, JOSIVAN REIS, EDSON ORTIZ DE MATOS, ALLAN RODRIGO ARRIFANO MANITO, CARMINDA C. M. DE MOURA CARVALHO, MARIA EMÍLIA DE LIMA TOSTES

A crescente crise climática é um dos principais desafios do século XXI, exigindo um esforço global de ações que busquem mitigar as consequências das ações humanas ao meio ambiente, resultando em um cenário oportuno para o desenvolvimento de tecnologias associadas a energias limpas. No setor do transporte, políticas relacionadas à implementação e difusão dos veículos elétricos ganham cada vez mais destaque como estratégias de mitigação aos impactos ambientais. Observou-se nos últimos anos um aumento exponencial no mercado desses veículos, não somente no cenário internacional, mas também no mercado nacional, ainda que se encontre diversas barreiras a serem superadas para o aumento da frota movida a eletricidade no Brasil. Este artigo busca analisar a relação entre qualidade de energia e mobilidade elétrica. Inicialmente é apresentado tanto conceitos quanto o contexto necessário para o melhor entendimento do tema em questão, em seguida sendo feita uma revisão bibliográfica de trabalhos científicos que busquem evidenciar possíveis impactos da mobilidade elétrica nas redes de distribuição. Os impactos estão ligados (A) as distorções harmônicas, (B) a variação da tensão, (C) a sobrecarga do sistema elétrico, (D) a dificuldade da operação do sistema

BIANCA CORRÊA, FILIPE VASCONCELOS, ISAIAS FERREIRA, ALFA FERREIRA, ANDRÉ MORAES, ANA BEATRIZ SOUSA

A necessidade de busca por modelos mais eficientes no âmbito da geração e do consumo de energia elétrica se intensificaram nas últimas duas décadas almejando a diminuição do desperdício de energia e de recursos naturais finitos, bem como o acompanhamento de aspectos de qualidade de energia, sendo estes contínuos pontos de atenção, o que tornam o planejamento e melhoria da utilização de recursos energéticos um tema cada dia mais em voga. Entretanto, para que possa ocorrer a realização de análises nesse sentido, faz-se necessário a utilização de ferramentas que permitam o monitoramento destas informações. Dado a esta motivação, foi desenvolvido o Sistema de Gestão da Geração de Energia Renovável - SIS2GER Este software é capaz de auxiliar nas tarefas de análise de eficiência, qualidade e consumo de energia elétrica, além do gerenciamento de dispositivos e usuários dentro do software. O presente trabalho toma como enfoque principal a modelagem do módulo WEB do SIS2GER, apresentando os paradigmas computacionais utilizados na estruturação do sistema.

IZIDIO SOUSA DE CARVALHO, ULISSES CARVALHO PAIXÃO JÚNIOR, MARIA EMÍLIA DE LIMA TOSTES, UBIRATAN HOLANDA BEZERRA, ANDRÉIA ANTLOGA DO NASCIMENTO

With the increase in energy tariffs throughout Brazil, there was a great concern among public public institutions with the impact of these readjustments in the total budget making it necessary to search for new ways to generate savings in energy consumption. From this scenario, it was developed the Automated System for Lighting and Cooling (SAIR), based on the concept of Internet of Things (IoT), using wifi connection in the system modules, access to the cloud and a web interface that allows users to remotely control the lighting and climate control of the environments of a public institution, aiming to provide the reduction of energy consumption energy consumption, besides the financial savings and the remote monitoring of these equipments. Besides, the cost to produce a SAIR module is low, and because of this its investment has a fast financial return, which favors its implementation in large buildings. large buildings.

JHENNIFER F. DOS SANTOS, LUCAS R. DE S. MORAIS, ELEN P. DE S. LOBATO, ANTONIO R. M DE SOUSA, WELLINGTON DA S. FONSECA, CARMINDA C. M. DE M. CARVALHO

A presença de harmônicas em sistemas elétricos resulta em aumento de consumo, temperatura e redução da vida útil dos motores elétricos. Com base no exposto, o impacto sobre esses parâmetros poderia ser reduzido na conexão estrela (380 Volts), onde uma corrente de entrada mais menor é obtida e com a qual os efeitos negativos podem ser reduzidos. Este trabalho realiza uma avaliação dos impactos dos 2º e 3º harmônicos de sequência negativa e zero em motores elétricos das classes IE2, IE3 e IE4 conectados em triângulo (220Volts) e estrela (380 Volts). Os resultados mostram que a temperatura não é afetada de forma considerável pela conexão nos terminais do motor, apresentando pequenas diferenças para os 3 motores analisados.

IAGO R. M. R. MORAIS, JONATHAN M. TABORA, THIAGO M. SOARES, Mª EMILIA L. TOSTES, EDSON M. ORTIZ, UBIRATAN H. BEZERRA.

Voltage variation is a silent enemy in electrical systems and with considerable effects on electric motors. In this work, technical experiments were carried out to evaluate the impact of this disturbance in electric motors classes IE2, IE3 and IE4, then computational simulations were carried out using genetic algorithms to predict the temperature of the analyzed motors. The results showed how the voltage variation produces deviations in consumption and temperature, while excellent temperature approximations were obtained by computational techniques.

LAURO CORREA DOS SANTOS JUNIOR, JONATHAN MUÑOZ TABORA, MARIA EMÍLIA DE LIMA TOSTES, EDSON ORTIZ DE MATOS, UBIRATAN HOLANDA BEZERRA, CARMINDA CÉLIA MOURA DE MOURA CARVALHO

Central America is a region with great potential for energy efficiency, which, however, has not been fully exploited. Lack of knowledge, policies and incentives represent the main challenges and barriers for the implementation of Minimum Energy Performance Standards (MEPS) in induction motors (IM's). This paper analyzes the current scenario of electric motors, comparing it with international experiences, as well as giving recommendations for the implementation of MEPS in the region. Considerations to be taken into account for substitution by end users are also made considering the voltage differences due to the importation of electric motors and the countries nominal voltages and finally an economical comparison of the payback variation with different voltage variation conditions.

JONATHAN M. TABORA, THIAGO MOTA SOARES,, AGO R. MORAES, M.E. DE LIMA TOSTES, EDSON ORTIZ DE MATOS, UBIRATAN H. BEZERRA

Electric motors are a widely used equipment capable of transforming electrical energy, consuming a significant part of the electrical energy in industries. With the advancement of technology in recent decades, electric motors have become more efficient and sustainable reaching efficiencies of approximately 96%, however the presence of electrical power quality disturbances can negatively affect the operation of these machines, increasing their losses and consequently decrease their efficiency. Based on this context, this work aims to compare the frame thermal variation in IE2-, IE3-and IE4-class motors, the latter being a line-start permanent magnet motor, connected in grounded star and in triangle under 2 nd , 3 rd , and 5 th order harmonics through 3D thermographic maps obtained from thermographic images. For the measurements, an AC three-phase power supply FCATHQ™ model was used, capable of generating pure sine waves and electrical power quality disturbances of various magnitudes, the data were collected through an infrared camera from the manufacturer FLIR model T620 and the linear load was imposed to the electric motors through a Foucault brake. The three electrical machines analyzed under harmonics are stressed until they reach their thermal equilibrium, the collected data is processed and then analyzed. The results show which harmonic order most impacts on each motor efficiency class, which area of the motor frame is most affected to get a sense of how different harmonic orders impact the internal components and materials of each motor and what is the thermal behavior of each connection for different voltage levels.

IAGO R. M. R. MORAIS, JONATHAN MUÑOZ TABORA, THIAGO MOTA SOARES, MARIA EMÍLIA DE LIMA TOSTES, EDSON ORTIZ DE MATOS