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Hybrid multilevel inverter system for Open-End Winding (OEW) induction motor drive based on Double-Star Chopper-Cells (DSCC) converter

Hybrid multilevel inverter system for Open-End Winding (OEW)...

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Italo Roger F. M. P. da Silva Cursino B. Jacobina Alexandre C. Oliveira Gregory A. de Almeida Carlos Maurício B. de R. Corrîa Post-graduate Program in Electrical Engineering PPgEE/COPELE Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Department of Control and Industrial Process Federal Institute of Alagoas (IFAL) Palmeira dos Indios AL Brazil

ISBN: (纸本)9781479967360

This paper proposes a hybrid multilevel topology for Open-End stator Winding (OEW) induction motor drive based on Modular Multilevel Cascade Inverter (MMCI) with Double-Star Chopper-Cells (DSCC) and 2-Level Voltage Source Inverter (2L-VSI). An efficient Voltage Reference Technique is proposed to generate the pole voltages of both inverters. As a result, the DSCC inverter is commanded in high-switching frequency, while the 2L-VSI operates at the fundamental frequency. A voltage-balancing control of the floating DC capacitors of the DSCC is presented to ensure the energy balance. At last, to investigate the proposed system and control strategy, experimental results are presented.

关键词： Voltage control Inverters Induction motors Topology Capacitors Inductors Logic gates

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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...

引用

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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Analysis of the resonant behavior of FSS using matryoshka geometry

Analysis of the resonant behavior of FSS using matryoshka ge...

引用

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

作者： Alfrêdo Gomes Neto Jefferson C. e Silva Joabson Nogueira de Carvalho Josiel Do Nascimento Cruz Hillner De Paiva Almeida Ferreira Group of Telecom. and Applied Electromagnetism Federal Inst. of Educ. Science and Technology of Paraiba Joao Pessoa PB Brazil Post-Graduate Program in Electrical Engineering Federal University of Campina Grande Brazi Brazil Group of Telecom. and Applied Electromagnetism Federal Inst. of Educ. Science and Technology of Paraíba Brazil Post-Graduate Program in Electrical Engineering Universidade Federal de Campina Grande Campina Grande PB BR

ISBN: (纸本)9781467394932

In this paper the resonant behavior of frequency selective surfaces, FSS, using matryoshka geometry is analyzed considering polarizations x and y. The basics of the FSS using matryoshka geometry are described for usual and open cases, including an expression to estimate the first resonant frequency. Initially, the FSS with two concentric square rings is considered and its resonant behavior analyzed. Then, the resonant behavior of FSS with two rings matryoshka geometry is examined. The analysis is based on the electric current distribution obtained using the commercial software ANSYS-Designer. With a better understanding of the resonance nature in matryoshka geometry the design parameters can be better adjusted and desired frequency responses properly achieved.

关键词： Frequency selective surfaces Geometry Resonant frequency Current Frequency response Europe

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Induced Currents and Planar Force in an Induction Planar Actuator

Induced Currents and Planar Force in an Induction Planar Act...

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Biennial Institute of electrical and Electronics Engineers Conference on Electomagnetic Field Computation

作者： Aly Ferreira Flores Filho Nolvi Francisco Baggio Filho Post-Graduate Program of Electrical Engineering Federal University of Rio Grande do Sul

ISBN: (纸本)9781424470594

The induction planar actuator (EPA) in study is an electromagnetic structure formed by a static ferromagnetic core with an aluminium plate that corresponds to the secondary, and a mover, also called primary;the latter comprehends two sets of three-phase windings that are orthogonal to each other. When they are fed by a three-phase ac excitation, a moving magnetic field is established;it can travel along the x-axis and the y-axis direction. The travelling magnetic field induces currents in the secondary;the interaction between those induced currents and travelling magnetic field produces a planar traction force responsible for the movement of the mover over the working area of the actuator. Induced currents and planar traction forces are studied by means of a finite element model, and experimental results are produced.

关键词： lateral axis actuators Aluminum sheet Orthogonal Planar magnetic field Work area finite element model Induced currents Traction force

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Six-phase open-end machine conversion system with reduced number of controlled components

Six-phase open-end machine conversion system with reduced nu...

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Annual Conference of Industrial Electronics Society

作者： Victor F. M. B. Melo Cursino B. Jacobina Nady Rocha Nustenil S. Marinus Post-Graduate Program in Electrical Engineering UFCG Electrical Engineering Department Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Federal University of Paraíba - UFPB João Pessoa Paraíba Brazil Federal Institute of Technology of Ceara - IFCE

This paper presents two six-phase open-end machine conversion systems. They are composed of three three-leg converters connected in series to a six-phase machine with open terminals, in an open-end winding connection. The converters use diodes to replace controlled switches, making the conversion system non-reversible and with a reduced number of controlled components. In this case, the machine must work always as a generator. A study concerning harmonic distortion and semiconductor losses is carried out. PWM and control strategies are developed. Simulation and experimental results in order to test these strategies are presented.

关键词： Topology Voltage control Harmonic distortion Control systems Generators Pulse width modulation Windings

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Partial Discharge Source Classification Based on Machine Learning and PRPD

Partial Discharge Source Classification Based on Machine Lea...

引用

International Conference on High Voltage engineering and Application, ICHVE

作者： João Victor Jales de Melo George Rossany Soares de Lira Edson Guedes Da Costa Pablo Bezerra Vilar Antonio Francisco Leite Neto Lenilson Andrade Barbosa Allan David Da Costa Silva Ana Cristina de Freitas Marotti André Irani Costa Post-graduate Program Federal University of Campina Grande Campina Grande Brazil Electrical Engineering Department Federal University of Campina Grande Campina Grande Brazil Eletrobras S.A. Rio de Janeiro Brazil

ISBN: (数字)9798350374988

ISBN: (纸本)9798350374995

A method for analyzing partial discharges is proposed to detect faults and evaluate the operational status of electrical system assets. Initially, the effectiveness of the method was hindered by electromagnetic interferences affecting the sensor, including corona, surface discharges, and radio signals. To address this challenge, multiple layers of signal processing were introduced. This paper proposes a new methodology for noise removal and classification of partial discharge sources based on clustering pulses by attributes derived from their shape. Consequently, it became feasible to distinguish partial discharges from the various sources of interference present in the measurements. The methodology was tested using a dataset of partial discharge measurements obtained from Current Transformers at an Eletrobras group substation in Brazil. Through this testing, the methodology proved capable of assessing the status of the analysed equipment.

关键词： Partial discharges Partial discharge measurement Substations Current transformers Current measurement Noise Fault location

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Numerical Experiment of Adding Patch Elements to X-band Microstrip Antennas

Numerical Experiment of Adding Patch Elements to X-band Micr...

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International RF and Microwave Conference, RFM

作者： Yusnita Rahayu Anhar Saktioto Irsan Taufik Ali Yussi Perdana Saputera M Novriza Teguh Praludi Department of Electrical Engineering Faculty of Engineering Universitas Riau Pekanbaru Indonesia Physics Dept. FMIPA Universitas Riau Pekanbaru Indonesia Doctoral Defense Post Graduate Program Universitas Brawijaya Malang Indonesia National Research and Innovation Agency Indonesia

This paper compares single microstrip antenna designs and microstrip arrays used for Manpack Radar with X-band frequency. Antenna array configurations were investigated for 1x2, 1x4, and 1x32 elements. A gain increase is required for each additional patch element. Patch dimensions are set at 9.17 x 10.10 x 0.035 mm. The parameters needed are X-Band frequency with gain >15 dBi, beamwidth angle of ≤5°, and bandwidth of more than 60 MHz. The simulation results show a good match with the target required for the 9.3 GHz frequency. The largest gain value numerically is obtained on the antenna with 32 patches, which is 17.1 dBi.

关键词： Radio frequency Microstrip antenna arrays Azimuth Simulation Microstrip antennas Radar Bandwidth

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Modeling and control of a XY positioning table

Modeling and control of a XY positioning table

引用

IEEE/IAS International Conference on Industry Applications

作者： Lucas J. da S. Moreira Christian C. Dias Rafael B. C. Lima Péricles R. Barros George Acioli Júnior Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Graduate Program in Electrical Engineering - PGEE Electrical Engineering Department - DEE Federal University of Campina Grande - UFCG 58429-900 Campina Grande - PB - Brazil

ISBN: (纸本)9781509051281

This paper is about modeling and control of a XY positioning table. It is described the construction and instrumentation of a double axis positioning system. It is developed a general electromechanical model, followed by the identification of simplified models for control purposes. At last, it is proposed a PID control strategy, tuned by Internal Model Control (IMC) technique.

关键词： IMC XY PID

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Modulation diversity effects in rayleigh fading multipath channels

Modulation diversity effects in rayleigh fading multipath ch...

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International Symposium on Telecommunications

作者： Raphael Tavares de Alencar Matheus de Araújo Cavalcante Waslon Terllizzie Araújo Lopes Wamberto José Lira de Queiroz Marcelo Sampaio de Alencar Federal University of Campina Grande (UFCG) Brazil Post-Graduate Program in Electrical Engineering-PPgEE-COPELE Institute for Advanced Studies in Communications (IECOM) Brazil Universidade Federal de Campina Grande Campina Grande PB BR

The wireless channel has characteristics of multipath fading, due to reflection, refraction and scattering. Modulation diversity is a bandwidth-efficient diversity technique that uses rotation, associated with the interleaving between the in-phase and quadrature components of a digital signal constellation. It is intended to mitigate the effects of fading in wireless communications. The research considered a scenario in which multiple paths are simulated, with associated random multiplicative noise and delay. The multipath fading effect is studied in this scenario, and a comparison between the BER values for 4-PSK and 8-PSK transmission is presented, to evaluate the gain provided by the modulation diversity scheme. An analysis concerning optimum rotation angles is performed, considering eight multipath scenarios, including cases with severe fading effect.

关键词： Fading Bit error rate Signal to noise ratio Phase shift keying Gain Wireless communication

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Estimating computer systems power consumption for time scaled experiments

Estimating computer systems power consumption for time scale...

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IEEE International Conference on Consumer Electronics - Berlin (ICCE-Berlin)

作者： Bruna M. J. C. Vilar Arthur V. De N. Silva Igor M. B. Ulisses Jaidilson Jó da Silva Angelo Perkusich Fred M. Bublitz Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Embedded Systems and Pervasive Computing Laboratory Center of Electrical Engineering and Informatics Universidade Federal de Campina Grande Campina Grande PB BR Embedded Systems and Pervasive Computing Laboratory Center of Electrical Engineering and Informatics Federal University of Campina Grande Campina Grande Brazil Electrical Engineering Department (DEE) Paraíba State University (UEPB)

Power policies are widely applied at computer systems such as desktops, notebooks, and smartphones. For example, the timeout policy to turn off the display. A power management policy must be tested by measuring the power consumption of an experimental platform running workloads. Such tests must be fast enough to feedback the development process with valuable information about the power policy performance. In this work, we have presented a methodology for estimating computer systems power consumption for time scaled experiments. Using the proposed methodology, we have reduced the overall time for developing a power management policy.

关键词： Computers Power demand Switches Power measurement Indexes Time measurement Turning

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