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

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

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International Conference on Harmonics and Quality of Power

作者： #x00C9 rica Mangueira Lima Núbia Silva Dantas Brito Benemar Alencar de Souza Wellinsílvio Costa dos Santos Laís Martins de Andrade Fortunato Post-Graduate Program in Electrical Engineering - PPgEE Federal University of Campina Grande - UFCG Campina Grande Brazil Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil Undergraduate student in Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil

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.

关键词： Harmonic analysis Time-frequency analysis Signal resolution Fourier transforms Impedance Conductors

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An automatic voltage disturbance classification system based on Clonal Selection Algorithm

An automatic voltage disturbance classification system based...

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2015 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2015

作者： De Souza Arruda, Bruno Willian Freire, Raimundo Carlos Silverio De Souza, Cleonilson Protasio Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Department of Electrical Engineering Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Center of Renewable and Alternative Energy Department of Electrical Engineering Federal University of Paraíba João Pessoa Paraíba Brazil

ISBN: (纸本)9781479961139

Classification of voltage disturbances in power systems is essential for modern society and can be very demanding according to the used method or the aimed accuracy. This paper presents a new intelligent approach aimed to automatically analyse power quality disturbances including sag, swell, outage, harmonics and normal waveform. The approach is based on Artificial Immune System and focuses on the application of a Clonal Selection Algorithm to extract features from disturbance waveforms and classify the disturbances in each 0.5 cycle of the fundamental frequency. Other important feature of the proposed approach is that it can be embedded since the resulted on-line classification tool achieves very low computational complexity. Comparisons and experimental results obtained from the application of the proposed method validate the approach and achieved a classification accuracy at least better than previous work. © 2015 IEEE.

关键词： Power quality

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Low-power energy generation systems for two-phase PM machine with reduced-switch-count controlled switches 7

Low-power energy generation systems for two-phase PM machine...

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

作者： Bahia, Filipe A. Da C. Jacobina, Cursino B. Rocha, Nady Da Silva, Italo Roger F. M. P. Salvadori, Fabiano Post-Graduate Program in Electrical Engineering PPgEE COPELE UFCG Brazil Department of Electrical Engineering Federal University of Campina Grande UFCG Campina Grande Paraíba Brazil Department of Engineering Federal University of the Paraíba UFPB João Pessoa Paraíba Brazil

ISBN: (纸本)9781467371506

This paper presents two power generation systems with a two-phase permanent magnet (PM) synchronous machine associated to a rectifier with small number of controlled switches. The topologies have as main purpose converting wind energy into electrical energy for low power applications, providing a great potential to be used in urban areas. They can be used in applications connected to the grid or in the stand-alone mode or feeding a micro grid. Compared with two three-phase generation systems that use reduced number of controlled switches, the proposed topologies permit obtaining sinusoidal machine currents, with low harmonic distortion, using a smaller number of controlled switches. Simulation and experimental results also are presented. © 2015 IEEE.

关键词： Topology

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An embedded asterisk platform instructional design to teach voice over IP in information technology undergraduate courses: Using raspberry PI and asterisk to build an embedded portable didactic tool 7

An embedded asterisk platform instructional design to teach ...

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7th International Conference on Computer Supported Education, CSEDU 2015

作者： Dias, M.C. Bezerra, L.C. Morais, D. Gabi, C.F. Perkusich, A. Electrical Engineering Coordination Laboratory of Telephony and Convergent Networks - LTCON 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)9789897581076

This paper shows the building of an embedded Asterisk platform as a key technique for providing Information Technology classes with an extra laboratorial environment for learning Voice over Internet Protocol. Besides building the platform, the students are asked to mount a functional telephony system with it that meets the criteria of low cost, low building complexity and high adaptability to convergent networks. The Raspberry PI version B was the board used to provide portability for the students to work outside the laboratory environment. Asterisk was presented as a useful tool on which the students could create a flexible system that could be easily deployed on convergent networks. This work was developed in the Telephony subject for the electrical engineering and the Telecommunications Systems undergraduate courses from the Federal Institute of Education, Science and Technology of Paraíba - IFPB, and presented good results in the students' learning achievements.

关键词： Students

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Three-phase drive systems based on OEW configurations with reduced controlled switch count

Three-phase drive systems based on OEW configurations with r...

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Brazilian Power Electronics Conference, COBEP

作者： Gregory A. A. Carlos Reuben P. R. Sousa Cursino B. Jacobina Joao P. R. A. Mello Luciano M. Barros Alexandre C. Oliveira Post-Graduate Program in Electrical Engineering - PPgEE Copele Department of Electrical Engineering Federal University of Campina Grande (UFCG) ParaIba Brazil

This paper proposes ten alternative drive topologies with reduced number of controlled switches. The topologies are composed by three-level (3L) and two-level (2L) legs combinations. All of them aim to feed a three-phase machine based on the concept of open-end-winding (OEW). Conventional OEW configurations are considered for comparison purposes. The proposed topologies are named accordingly to the number of levels associated in each leg. For example, a topology with one 3L leg and five 2L legs is named 322-222. The other configurations are named in a similar manner. The OEW based systems using proposed configurations aim to give intermediate alternative solution in terms of cost-benefit rather than using conventional configurations. Some simulation and experimental results are presented in order to validate the theoretical approaches.

关键词： Switches Legged locomotion Inverters Topology Pulse width modulation Windings

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Three-phase four-wire AC-DC-AC multilevel topologies obtained from an interconnection of three-leg converters

Three-phase four-wire AC-DC-AC multilevel topologies obtaine...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Ayslan C. N. Maia Cursino B. Jacobina Nayara B. Freitas Antonio P. D. Queiroz Edison R. C. Silva Post-Graduate Program in Electrical Engineering - PPgEE Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Federal Institute of Alagoas (IFAL) Palmeira dos Indios AL Brazil Federal Institute of Paraiba (IFPB) Picui PB Brazil

ISBN: (纸本)9781509007387

This paper investigates three AC-DC-AC multilevel topologies for three-phase four-wire (3P4W) applications obtained from an interconnection of three-leg voltage source converters (VSCs). The topologies provide bidirectional power flow and can be applied in line voltage regulators, universal active power filters and uninterrupted power supplies (UPS). Operating principles, a pulse-width modulation (PWM) technique and an overall control strategy are developed. The PWM and control strategies are suitable to regulate the DC-link voltage and to optimize the harmonic distortion, reducing switching stress and power losses. Simulation results are used to compare the proposed configuration with a conventional solution in terms of harmonic distortion and semiconductor losses. Experimental results are presented to validate the theoretical considerations and were obtained by using IGBTs with dedicated drives and a digital signal processor (DSP) with appropriated plug-in boards and sensors.

关键词： Voltage control Topology Legged locomotion Capacitors Pulse width modulation Harmonic distortion Power conversion

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Seven level asymmetric inverters with coupled inductors

Seven level asymmetric inverters with coupled inductors

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Brazilian Power Electronics Conference, COBEP

作者： Diego A. Acevedo Bueno Juliano C. Leal da Silva Edison Roberto C. da Silva Abinadabe Silva Andrade Tulio Albuquerque Dias Post-graduate Program in Electrical Engineering - PPgEE/COPELE Universidade Federal de Campina Grande Campina Grande PB BR Post-graduate Program in Electrical Engineering - PPgEE/COPELE Federal University of Campina Grande Campina Grande PB Brazil COPELE Federal University of Campina Grade/LETAM Campina Grande PB Brazil

This paper proposes two seven level asymmetric inverter with coupled inductors that enable a reduction in the number of controlled switching devices. However, the lack of redundant states and difference in the maximum pole voltages reduce the performance of the inverters due to higher winding currents and saturation of magnetic core. For mitigating those issues, a coupled inductor with elevated magnetizing inductance is used. The operation principle, conducting states and modulation strategy are described. Simulation and experimental results demonstrate the feasibility of proposed topology.

关键词： Topology Inductors Switches Windings Inductance Modulation Capacitors

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Influence of conductor tube in circular PMA for UWB range

Influence of conductor tube in circular PMA for UWB range

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SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Paulo Fernandes da Silva Paulo Henrique da Fonseca Silva Jefferson Costa e Silva Alexandre Ferreira dos Santos Maria do Carmo de Luna M. Frazão Alexandre Jean René Serres Raimundo Carlos Silvério Freire Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba Brazil Post-Graduate in Electrical Engineering COPELE Federal University of Campina Grande Brazil Post-Graduate in Electrical Engineering Federal Institute of Paraiba IFPB Brazil Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba IFPB Brazil Post-Graduate in Electrical Engineering - COPELE Universidade Federal de Campina Grande Campina Grande PB BR

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 1/8? reduce the bandwidth by 50% in X-band (8 ~ 12 GHz), half power bandwidth HPBW is approximately 90° and gain of 6.92 dBi.

关键词： Antenna measurements Electron tubes Aluminum Textiles

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An automatic thermal cycling based test platform for thermoelectric generator testing

An automatic thermal cycling based test platform for thermoe...

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2015 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2015

作者： Veras, Julio Cezar De Cerqueira De Souza Arruda, Bruno Willian Vieira, Debora Alburquerque Melo, Ewerton C.S. De Souza, Cleonilson Protasio Coordination Section of Electronics Federal Institute of Pernambuco - IFPE Campus de Garanhuns Garanhuns Brazil Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Department of Electrical Engineering Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Department of Electrical Engineering Federal University of Paraíba - UFPB João Pessoa Paraíba Brazil

ISBN: (纸本)9781479961139

Thermoelectric (TE) modules are solid-state devices that convert directly thermal energy in electrical energy. However, they can undergo performance degradation due to thermal cycling. In the present study, a control-based test platform that is capable to apply specific thermal cycling pattern at periodic intervals is presented in order to evaluate performance degradation that influence the TE module lifetime. Using this test platform, some parameters and the figure of merit ZT of a commercial TE module are measured before and after thermal cycling application. An important feature of the proposed platform is that the applied thermal cycling is bipolar, that is, it is possible to apply positive or negative temperature difference and, through this, performance degradation would be observed after only 548 thermal cycles much lower than previous works. © 2015 IEEE.

关键词： Thermal cycling

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Modal analysis of a metallic via hole by the WCIP

Modal analysis of a metallic via hole by the WCIP

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

作者： De F. Serres, Georgina K. Serres, Alexandre J. R. Freire, Raimundo C. S. Baudrand, Henri Post-Graduate Program in Electrical Engineering - COPELE Federal University of Campina Grande UFCG Campina Grande Brazil L.A.P.L.A.C.E-G.R.E ENSEEIHT Toulouse France

ISBN: (纸本)9781467394925

This paper presents a new electromagnetic modeling of a via-hole using a Wave Concept Iterative Procedure. There are specific TM modes associated with the insertion of the via-hole influencing the incident and reflected waves, called the "via's modes". The formulation and results are presented considering the influence of one and two via's mode. The advantage of the model presented is the possibility to simulate planar circuits with a layer and a via-hole considering the effects of the field that propagates around the via. © 2015 IEEE.

关键词： Modal analysis

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