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Universal Active Power Filter Based on AC-DC-AC Converter with Six Controlled Switches for Single-Phase Systems 12

Universal Active Power Filter Based on AC-DC-AC Converter wi...

引用

12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Rodrigues, Phelipe L. S. Jacobina, Cursino B. Lima, Antonio M. N. Post-Graduate Program in Electrical Engineering - PPgEE - Copele Campina Grande Paraíba58429-900 Brazil Department of Electrical Engineering Campina Grande Paraíba58429-900 Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158266

This paper presents an ac-dc-ac converter with six controlled switches for single-phase systems applied as a universal active power filter (UAPF). The proposed topology is feasible for compensating voltages swells and harmonics generated by nonlinear loads. The difference between the conventional and proposed topology is the replacement of a controlled leg (composed of IGBTs) for an uncontrolled leg (composed only of diodes). For performance comparisons, current THD, switching and conduction losses of the semiconductors, average switching frequency, and power in the transformer were used as parameters. Control and pulsewidth modulation techniques based on space vector approaches were developed to eliminate zero-crossing distortions caused by the use of the uncontrolled leg. Simulation and experimental results were presented for validation of the mathematical model. © 2020 IEEE.

关键词： Topology

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Measurement equipment for characterization of ferromagnetic materials

Measurement equipment for characterization of ferromagnetic ...

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2015 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2015

作者： Moraes, Tarcisio Oliveira De Freire, Raimundo Carlos Silverio Vieira, Debora Albuquerque Souza, Cleonilson Protasio De Post-Graduate Program in Electrical Engineering - PPGEE COPELE Federal University of Campina Grande UFCG Campina Grande Brazil Federal University of Campina Grande UFCG Campina Grande Brazil Post-Graduate Program in Electrical Engineering - PPGEE/UFPB Department of Electrical Engineering Federal University of Paraíba UFPB João Pessoa Brazil

ISBN: (纸本)9781479961139

Ferromagnetic materials have magnetic properties which determine its magnetic field conductivity characteristics. Such characteristics are extremely important for the proper selection and use of these materials in measurement processes, for example. Therefore, this paper presents an equipment for the characterization of ferromagnetic materials constructed in a laboratory. The experimental results of this equipment are acquired and compared with the experimental results obtained with an industrially manufactured apparatus called hysteresisgraph, designed to provide magnetic characterization of magnetic materials. The results of the comparison demonstrate that the equipment presented has low relative error and can be applied in academic projects which require magnetic characterization of ferromagnetic materials developed in the laboratory. © 2015 IEEE.

关键词： Ferromagnetic materials

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Influence of conductor tube in circular PMA for UWB range

Influence of conductor tube in circular PMA for UWB range

引用

SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, IMOC 2015

作者： Da Silva, Paulo Fernandes Silva, Paulo Henrique Da Fonseca E Silva, Jefferson Costa Dos Santos, Alexandre Ferreira Frazão, Maria Do Carmo De Luna M. Serres, Alexandre Jean René Freire, Raimundo Carlos Silvério Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba IFPB João Pessoa Brazil Post-Graduate in Electrical Engineering - COPELE Federal University of Campina Grande UFCG Campina Grande Brazil

ISBN: (纸本)9781467394925

The study of printed monopole antennas (PMA) with truncated ground plane has application in various types of technologies. This kind of ground plane, promotes an omnidirectional radiation pattern with broadband response and allows the antenna to suffer influence from nearby conductive material. This article presents the simulated and measured results of influences from a rectangular aluminum tube on a circular PMA that meets the UWB technology requirements. The results obtained indicate that the tube at a wavelength distance of 1/8λ reduce the bandwidth by 50% in X-band (8 ∼ 12 GHz), half power bandwidth HPBW is approximately 90° and gain of 6.92 dBi. © 2015 IEEE.

关键词： Bandwidth

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Viability of using monofilament polyamide lines in AC live work 33

Viability of using monofilament polyamide lines in AC live w...

引用

33rd electrical Insulation Conference, EIC 2015

作者： Gomes, A.M.M.B. Ferreira, T.V. Araujo, J.F. Barbosa, L.A. Lucena, M.D. Costa, E.G. Post-Graduate Program in Electrical Engineering PPgEE-COPELE Department of Transmission Lines Recife Pernambuco Brazil Department of Electrical Engineering Federal Uruversity of Campina Grande Campina Grande Paraiba Brazil

ISBN: (纸本)9781479973521

This article presents considerations and results of practical tests on the use of insulating polyamide monofilament line as the likely replacement for the traditional non-insulating multifilament ropes, employed in online interventions. The use of insulating polyamide monofilament line decreases the necessary time in online interventions, since some safety distances can be reduced. Furthermore, its cost is less than UD 0.08 per meter. The line samples were firstly mechanically aged, providing five different degrees of degradation. electrical tests were performed in all samples, under three conditions: clean, moistened with tap water and moistened with saline water. A traditional insulating hot stick was taken as reference, due to its reliability and long term use in online interventions. The results are promising and indicate a desirable scenario, since the use of such line reduces time and effort, and also increases the process safety. © 2015 IEEE.

关键词： Insulation

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Analysis of the influence of the window used in the Short-Time Fourier Transform for High Impedance Fault detection 17

Analysis of the influence of the window used in the Short-Ti...

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17th International Conference on Harmonics and Quality of Power, ICHQP 2016

作者： Lima, Érica Mangueira Brito, Núbia Silva Dantas De Souza, Benemar Alencar Dos Santos, Wellinsílvio Costa De Andrade Fortunato, Laís Martins Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande - UFCG Campina Grande Brazil Federal University of Campina Grande - UFCG Campina Grande Brazil

ISBN: (纸本)9781509037926

A study on the length and type of the window function used in the Short-Time Fourier Transform (STFT), along with its suitability to extract the harmonic content from a High Impedance Fault (HIF) current is presented on this paper. Additionally, a method to detect HIF based on the phase angle of the third harmonic current is developed. The proposed algorithm performance is evaluated by two database: one containing HIF simulated signals and other containing actual HIF oscillographic records. This paper presents the current state of this research, and, so far, the method is able to detect HIF occurring in different types of surfaces (wet and dry), as well as it is insusceptible to typical noises present in the real oscillograms. © 2016 IEEE.

关键词： Oscillographs

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Three-Phase shunt active power filter based on the interconnection of single-Phase and three-Phase converters

Three-Phase shunt active power filter based on the interconn...

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2013 12th Brazilian Power Electronics Conference, COBEP 2013

作者： Maciel, A.M. Jacobina, C.B. Melo, V.B. Dos Santos, E.C. Fabricio, E.L.L. Post-Graduate Program in Electrical Engineering -PPgEE -COPELE Brazil 58429-900 Campina Grande -PB Brazil -PB Brazil Department of Electrical and Computer Engineering Purdue School of Engineering and Technology IUPUI United States

ISBN: (纸本)9781479902729

This paper presents a topology based on the interconnection of single-phase H-bridge converters and a three-phase converter acting as a shunt active power filter. Contributions for the model, PWM approach and control strategies are presented to the studied converter. As compared to the conventional solution by using just H-bridges converters, the proposed one reduces the number of semiconductor and storage devices while keeping the same characteristics of high number of levels. A comprehensive THD analysis will be considered followed by simulated and experimental outcomes. © 2013 IEEE.

关键词： Bandpass filters

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A SPECTRUM SENSING ALGORITHM BASED ON STATISTIC TESTS FOR COGNITIVE NETWORKS SUBJECT TO FADING

A SPECTRUM SENSING ALGORITHM BASED ON STATISTIC TESTS FOR CO...

引用

European Signal Processing Conference

作者： Fabricio B. S. de Carvalho Jeronimo S. Rocha Waslon T. A. Lopes Marcelo S. Alencar Post-Graduate Program in Electrical Engineering - PPgEE - COPELE DEE - UFCG Iecom - UFCG

ISBN: (纸本)9781479946037

Cognitive radio is a viable technology for the next generation of wireless communications. The ability to sense the electromagnetic spectrum and to enable vacant bands to other users has been investigated in the past years. One important issue is the use of an efficient spectrum sensing algorithm to monitor the frequency band occupancy. Usually, the effects of fading are overseen in the analysis of those algorithms. This paper aims to evaluate the performance of a spectrum sensing algorithm based on Jarque-Bera test. Rayleigh fading is considered in this paper. Preliminary simulation results are provided, to demonstrate the potential of the proposed strategy.

关键词： Cognitive Radio Signal Processing Spectrum Sensing Statistic Tests Jarque-Bera Test Rayleigh Fading Channel

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A problem-based learning case study for teaching voice over internet protocol - VoIP: Using asterisk as a tool for teaching VoIP for information technology classes

A problem-based learning case study for teaching voice over ...

引用

6th International Conference on Computer Supported Education, CSEDU 2014

作者： Dias, M.C. Gabi, C.F. Rodrigues, E.P. Souza, V.R. Perkusich, A. Coordination of Electrical Engineering Federal Institute of Education Science and Technology of Paraíba - IFPB João Pessoa Brazil Post-Graduate Program in Electrical Engineering - PpgEE - COPELE Electrical Engineering Department Federal University of Campina Grande - UFCG Campina Grande Brazil

ISBN: (纸本)9789897580215

This paper shows the use of PBL (Problem-Based Learning) technique as a key to learning VoIP in courses like electrical engineering and Computer Networks in conjunction with open source and the public domain software called Asterisk which was used to create the scenario of the experiment and the problems presented to the students. In order to make the validation, the experiment was applied to students of Bachelor in electrical engineering and in Communication Technology System, undergraduate courses at the Federal Institute of Education, Science and Technology of Paraíba - IFPB, in the Telephony subject, with promising results. The Asterisk software was presented as a useful and flexible tool for constructing scenarios and problems for the teaching of VoIP technologies and the used approach resulted as effective for improving the attainment of the defined learning objectives.

关键词： Teaching

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Study on the applicability of microstrip circular antennas in partial discharges detection in power transformers 7

Study on the applicability of microstrip circular antennas i...

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7th Brazilian electrical Systems Symposium, SBSE 2018

作者： Xavier, G.V.R. Da Costa, E.G. Serres, A.J.R. De Oliveira, A.C. Nobrega, L.A.M.M. Cruz, J.N. Post-Graduated Program in Electrical Engineering-PPgEE-COPELE Federal University of Campina Grande Campina Grande Brazil Federal University of Campina Grande Campina Grande Brazil

ISBN: (纸本)9781538633632

The degradation of transformer's internal insulation system can be monitored by partial discharges activity. Among the supervising systems, the use of ultra high frequency (UHF) antennas attached on transformer's tank is highlighted. The UHF microstrip antennas can be used on this task and provide some interesting features, such as, low cost, ease of manufacturing and installation on several facilities. However, the microstrip antennas have a narrow band. The main objective of this work is to analyze the applicability of a microstrip circular antenna on detection of partial discharges in power transformers. For this purpose, a truncated ground plane technique for bandwidth optimization was applied. The manufactured antenna reached a high sensitivity for the partial discharges detection, showing mean gainvalue higher than 2 dB on the frequency range analyzed, as well return losses lower than-10 dB. © 2018 IEEE.

关键词： Partial discharges

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Modeling and control of the modular multilevel cascade converter based on chopper-cells for grid-connected photovoltaic systems 7

Modeling and control of the modular multilevel cascade conve...

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7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015

作者： Luna, Bruno Emmanuel De O. B. Jacobina, Cursino B. Oliveira, Alexandre C. Da Silva, Italo Roger F. M. P. Post-graduate Program in Electrical Engineering - PPgEE/COPELE Aprígio Veloso 882 Campina Grande-PB58429-900 Brazil Aprígio Veloso 882 Campina Grande-PB58429-900 Brazil

ISBN: (纸本)9781467371506

This paper presents a modular multilevel cascade converter (MMCC) based on chopper-cells for a grid-connected photovoltaic (PV) application suitable to medium and high voltage systems without line-frequency transformers. This converter is characterized by a modular arm structure composed by cascaded chopper-cells with floating dc capacitors, each one connected to a photovoltaic panel. This paper proposes a continuous model and a control method to achieve independent voltage control of all the floating dc capacitors, enabling the tracking of the maximum power point for each photovoltaic panel. The validity of the theory is confirmed by simulation and experiment. © 2015 IEEE.

关键词： Choppers (circuits)

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