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检索条件"机构=Graduate Program in Electrical Engineering PPGEE"

共 214 条记录，以下是11-20 订阅

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Time-Domain Analysis of Protection Systems - Assessing the Behavior of Overcurrent Function of Harmonic Filters During Energizations

Time-Domain Analysis of Protection Systems - Assessing the B...

引用

Workshop on Communication Networks and Power Systems (WCNPS)

作者： João R. Soares De Souza Felipe Vidotti Monteiro Filipe B. Resende Alberto De Conti UFMG - Universidade Federal de Minas Gerais Vale S. A. PPGEE - Graduate Program in Electrical Engineering - UFMG

This paper evaluates the behavior of harmonic filters subjected to overcurrents during energization. Statistical studies were carried out in ATPDraw considering different techniques to estimate the magnitude of inrush currents, one based on a true RMS estimator and another based on a 60-Hz Fourier filter phasor estimator. The results show that the theoretical limits of the currents used as reference to the overcurrent protection settings presented in literature were consistently defined in the evaluated cases, but that the selection of the decay time could be improved.

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Inductive Voltage Transformer Model for High-Frequency Studies

Inductive Voltage Transformer Model for High-Frequency Studi...

引用

Workshop on Communication Networks and Power Systems (WCNPS)

作者： Érico E. B. Mendes Ana Clara S. Assis Marcello H. M. Pinto Alberto De Conti PPGEE/UFMG - Graduate Program in Electrical Engineering LRC - Lightning Research Center UFMG - Universidade Federal de Minas Gerais

A wideband black-box model is proposed to represent the transient response of an inductive voltage transformer used in 15-kV class distribution systems in Brazil. The proposed model is used to evaluate the surge transfer characteristics of the voltage transformer considering different loads for the application of a step-like impulse voltage at primary side. The model is built as a Norton-type equivalent circuit that is valid from 10 Hz to 10 MHz. It is demonstrated that the model is able to accurately reproduce the transient waveforms measured at the transformer secondary side for the application of impulse voltages at the primary side in all tested cases.

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Ćuk DC-DC Converter with Multilevel Flying Capacitor Switching Cell

Ćuk DC-DC Converter with Multilevel Flying Capacitor Switch...

引用

IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Vitor Freire Bezerra Rhavél Batista Morais Montiê Alves Vitorino Graduate Program in Electrical Engineering (PPgEE-COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

The large industries that work with high power demand increasingly want to optimize their production lines. In this context, several studies and research about the multi-level power converts have been realized in last years, as they have several advantages when compared to traditional two-level topologies: better harmonic performance, filters reduction, lower components voltage stress and higher power process capability. The present work proposes a Cuk DC-DC converter composed of multilevel flying capacitor asymmetric totem-pole switching cell. This structure is achieved by replacing one leg of switch/diode of the traditional two-level asymmetric totem-pole cell by a similar multilevel flying capacitor cell. This work presents a brief analysis of the operation of the proposed converter, as well as the control strategy to keep the output voltage at the desired value and contains simulation results to validate the theoretical approach.

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Zeta DC-DC Converter with Multilevel Flying Capacitor Switching Cell

Zeta DC-DC Converter with Multilevel Flying Capacitor Switch...

引用

IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Montiê Alves Vitorino Graduate Program in Electrical Engineering (PPgEE-COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

Multilevel power converters have been aim of research in the last years due to their advantages when compared to traditional two-level topologies: better harmonic performance, filters reduction, lower components voltage stress and higher power process capability. Following this trend, the present work proposes two Zeta DC-DC converters composed of multilevel flying capacitor asymmetric totem-pole switching cells. These structures are achieved by replacing one leg of switch/diode of the traditional two-level asymmetric totem-pole switching cell by a similar multilevel flying capacitor switching cell. A generalized structure of the flying capacitor switching cell for $k$ switches is presented. An operation analysis of the proposed converter is presented as well as simulation results to validate the theoretical approach.

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SEPIC DC-DC Converter With Multilevel Flying Capacitor Switching Cell

SEPIC DC-DC Converter With Multilevel Flying Capacitor Switc...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Montiê Alves Vitorino Rhavél Batista Morais Armando J. G. Abrantes-Ferreira Maurício B. de R. Corrêa Graduate Program in Electrical Engineering (PPgEE–COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

Multilevel power converters have been aim of research in the last years due to their advantages when compared to traditional two-level topologies: better harmonic performance, filters reduction, lower components voltage stress and higher power process capability. Following this trend, the present work proposes two SEPIC DC-DC converters composed of multilevel flying capacitor asymmetric totem-pole switching cell. These structures are achieved by replacing one leg of switch/diode of the traditional two-level asymmetric totem-pole cell by a similar multilevel flying capacitor cell. An operation analysis of the proposed converter is presented, as well as hardware-in-the-loop real-time simulation results to validate the theoretical approach.

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Three-phase Multilevel NPC Rectifier with High-Frequency Pulsating DC-bus, Reduced Number of Switches and Galvanic Isolation with Transformer with Center Tap

Three-phase Multilevel NPC Rectifier with High-Frequency Pul...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Yuri Cavalcanti Ailton Do Egito Dutra Montiê Alves Vitorino Graduate Program in Electrical Engineering (PPgEE–COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

This paper proposes a three-phase three-level AC/DC converter with reduced number of controlled switches and high-frequency DC-bus based on NPC (Neutral Point Clamped) topology, for unidirectional power flow applications. Galvanic isolation is reached by using a center tap transformer, which requires only a full-bridge at it primary side. No bulky electrolytic capacitors are needed on the DC-bus, in contrast to conventional multilevel topologies. A PWM strategy with carriers arranged in alternating phase opposition (PWM-APOD) is used to operate the proposed converter. The applied PWM technique is able to operate the converter stage on the AC side with only two switches commuting per switching period. The switches of the isolated pulsating DC/DC converter are commutated with half the switching frequency of the converter on the AC side. A dual-loop control strategy with PI voltage and PI resonant current controllers is adopted to ensure reference load voltage and almost sinusoidal grid currents. Simulation and experimental results are presented to validate the proposed converter operation.

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Towards a wireless energy autonomous IoT module with a self-adaptable data diet 5

Towards a wireless energy autonomous IoT module with a self-...

引用

5th International Symposium on Instrumentation Systems, Circuits and Transducers, INSCIT 2021

作者： Vitoriano, Felipe Augusto Gomes, Gabriel Pimentel De Lima Monteiro, Davies William Graduate Program on Electrical Engineering - PPGEE/UFMG Belo Horizonte Brazil School of Engineering Electrical Engineering UFMG Belo Horizonte Brazil UFMG Dept. of Electrical Engineering Belo Horizonte Brazil

ISBN: (纸本)9781728197265

This paper describes a proof of concept of an Internet of Things (IoT) module, with wireless communication, sensing and energy harvesting capabilities. A self-adaptable power approach for balancing energy consumption and generation is also discussed, in view of a modular architecture for the system. Some preliminary results are shown pointing out bottlenecks and possibilities for improvements, considering the constraints in size, energy and communication of IoT technologies. © 2021 IEEE.

关键词： Energy harvesting

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Multi-Objective Grey Wolf Optimizer for the Identification Process of a real MIMO System

Multi-Objective Grey Wolf Optimizer for the Identification P...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Allan Christian Krainski Ferrari Gideon Villar Leandro Leandro dos Santos Coelho Eletrical Engineering Department Federal University of Paraná UFPR Curitiba Brazil Electrical Engineering Graduate Program (PPGEE) Federal University of Paraná (UFPR) and Industrial and Systems Engineering Graduate Program (PPGEPS) Pontifical Catholic University of Paraná (PUCPR)

This article implements the multi-objective grey wolf optimizer (MOGWO) in the identification process of a multivariable system. For a sequence of 100 runs, MOGWO approach had compared and analyzed with the grey wolf optimizer (GWO), the single-objective version. In the computational simulation, the determination coefficient values and mean square error had used to analyze the quality of the models obtained. In the results, MOGWO showed superior to GWO to the differences between the order of magnitude of the system outputs. The implementation shows that MOGWO and other multi-objective metaheuristics can be an alternative method to solve problems of identification processes of multivariable systems.

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Manta Ray Foraging Optimization Approaches on Multivariable PID Controller Tuning

Manta Ray Foraging Optimization Approaches on Multivariable ...

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Congress on Evolutionary Computation

作者： Yan Lieven Souza Luúio Luiza Scapinello Aquino Da Silva Viviana Cocco Mariani Leandro Dos Santos Coelho Electrical Engineering Graduate Program (PPGEE) Federal University of Parana (UFPR) Curitiba Brazil Department of Electrical Engineering Mechanical Engineering Graduate Program (PPGEM) Pontifical Catholic University of Parana (PUCPR) and Federal University of Parana (UFPR) Curitiba Parana Brazil Department of Electrical Engineering Industrial and Systems Engineering Graduate Program (PPGEPS) Pontifical Catholic University of Parana (PUCPR) and Federal University of Parana (UFPR) Curitiba Brazil

This work presents a performance comparison between the newly developed Manta Ray Foraging Optimization (MRFO) and two different variants created for tuning a decentralized fractional order proportional-integral-derivative (FOPID) controller for a multiple-input multiple-output (MIMO) application. The application consists of a ball mill pulverizing system to pulverize coal and maximize fuel efficiency. MRFO and its applications have the task of finding the optimal controller variable values to control the system's temperature and pressure. The MRFO is a metaheuristic based on the behavior of manta rays, and although it shows efficient performance it may be improved through the use of techniques which generate new variants of the algorithm. Two techniques were used in the de-velopment of new variants: Quantum mechanics and opposition-based learning. The three different versions of MRFO were used to minimize a custom fitness function which is a combination of the integral time squared error (ITSE) and the overshoot of the system response. Simulations were carried using Simulink and Matlab softwares. For analyzing the performances, statistical measures such as minimum, maximum, best, mean, median, and standard deviation of the fitness function over 50 runs were used. Additionally, the different variants were also compared for minimizing 10 benchmark functions. The results show that the use of the previously mentioned techniques improve the performance of the original MRFO in optimizing the FOPID to control the ball mill pulverizing system.

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Multi-Objective Grey Wolf Optimizer for the Tuning Process of the FOPID Controller

Multi-Objective Grey Wolf Optimizer for the Tuning Process o...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Allan Christian Krainski Ferrari Gideon Villar Leandro Leandro Dos Santos Coelho Gilberto Reynoso Meza Eletrical Engineering Department Federal University of Paraná UFPR Curitiba Brazil Electrical Engineering Graduate Program (PPGEE) Federal University of Paraná (UFPR) Industrial and Systems Engineering Graduate Program (PPGEPS) Pontifical Catholic University of Paraná (PUCPR) Industrial and Systems Engineering Graduate Program (PPGEPS) Pontifical Catholic University of Paraná Curitiba Brazil

This article implements the multi-objective grey wolf optimizer (MOGWO) in the tuning process of the gains of the Fractional-Order Proportional-Integral-Derivative (FOPID) controller applied in the control of a boiler system. For a sequence of 100 runs, this application had compared and analyzed with other implementation that uses MOGWO to optimize the gains of the classical Proportional-Integral-Derivative (PID) controller. In the computational simulation, the value hypervolume metric had used to analyze the performance of the controllers. In the results, the implementation of the FOPID showed superior to PID, where the comparison had validated by a hypothesis test. Despite the higher computational cost concerning the tuning process of the PID controller, this study proved that the FOPID controller can be advantageous for industrial applications.

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