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检索条件"机构=Post-Graduate Program in Electrical Engineering - PpgEE - COPELE"

共 131 条记录，以下是81-90 订阅

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Direct Torque Control Scheme for a Nine-Phase Induction Motor With Reduced Current Harmonic

Direct Torque Control Scheme for a Nine-Phase Induction Moto...

引用

Brazilian Power Electronics Conference, COBEP

作者： Gilielson F. da Paz Isaac S. de Freitas Victor F. M. B. Melo Alexandre G. F. da Silva Post-Graduate Program in Electrical Engineering - PPgEE UFPB Federal University of Paraíba Paraíba Brazil

ISBN: (数字)9781728141800

ISBN: (纸本)9781728141817

This paper discusses a modified Direct Torque Control (DTC) method in order to reduce phase current harmonic distortion in a nine-phase asymmetrical induction motor drive system. Since the classical DTC is a direct adaptation from the three-phase case, it does not take into account the presence of the non-producing torque current components obtained from the Space Vector Decomposition (SVD) technique. Thus, in classical DTC these non-producing torque components assume high amplitudes, causing distortion in phase currents. In this way, it is shown that modified DTC minimizes the undesired components, reducing significantly the distortion in phase currents while maintaining the fast dynamic response of classical DTC.

关键词： Torque Stators Switches Harmonic distortion Rotors Torque control

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Comparison between wire and wireless EEG acquisition systems based on SSVEP in an Independent-BCI

Comparison between wire and wireless EEG acquisition systems...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Richard M. G. Tello Sandra M. T. Müller Teodiano Bastos-Filho Andre Ferreira Post-Graduate Program of Electrical Engineering (PPGEE). UFES Vitoria Brazil Department of Computer and Electronics (CEUNES) Brazil

This paper presents a comparison between two different technologies of acquisition systems (BrainNet36 and Emotiv Epoc) for an Independent-BCI based on Steady-State Visual Evoked Potential (SSVEP). Two stimuli separat... 详细信息

关键词： Visualization Electrodes Indexes Accuracy Brain-computer interfaces Synchronization Feature extraction

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A software framework for user-level power management

A software framework for user-level power management

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

作者： Bruna M. J. C. Vilar Diógenes G. Gondim Zeus C. Barros Frederico M. Bublitz Hyggo O. Almeida Angelo Perkusich Post-Graduate Program in Electrical Engineering–PPgEE–COPELE Embedded Systems and Pervasive Computing Lab Center for Strategic Technologies in Health–NUTES State University of Paraiba–UEPB Electrical Engineering Department (DEE) Federal University of Campina Grande–UFCG

Most operating systems implement their own power management techniques, but it is hard to modify or hack their power policies without the source code. Many dynamic power management architectures have been proposed in the literature, but they are not integrated with the underlying OS power manager. In this work, we propose a software framework for user-level power management, with a flexible architecture to be adapted to different policies and integrated with OS power managers.

关键词： Power demand Middleware Operating systems Network interfaces Mathematical model Estimation

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Traditional TCP congestion control algorithms evaluation in wired-cum-wireless networks

Traditional TCP congestion control algorithms evaluation in ...

引用

International Wireless Communications and Mobile Computing Conference, IWCMC

作者： M. C. Dias L. A. Caldeira A. Perkusich Post-graduate Program in Electrical Engineering - PpgEE - COPELE Federal University of Campina Grande - UFCG Campina Grande Brazil Electrical Engineering Coordination Federal Institute of Education Science and Technology of Paraíba - IFPB João Pessoa Brazil

Congestion control algorithms exist for decades to prevent package loss in intense traffic networks. Several solutions developed over the years tried to solve this problem, including the creation of new algorithms. However, hybrid wired and wireless networks, or wired-cum-wireless, common in modern days, bring new challenges to programmers and engineers who try to overcome the numerous new problems that this kind of network presents. This work carries out a performance comparison, in a wired-cum-wireless network, using TCP congestion control algorithms variants: New Reno and CUBIC. The comparison is to determine which of those algorithms performs better in several situations, like multiple disconnections caused by mobility, interference and congested links. The results showed that the CUBIC is a more stable and fair algorithm, but it has a significantly less data flow than New Reno.

关键词： Standards Interference Receivers Mobile handsets Transmitters Wireless communication Algorithm design and analysis

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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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IEEE Instrumentation and Measurement Technology Conference

作者： Bruno Willian de Souza Arruda Raimundo Carlos Silvério Freire Cleonilson Protásio de Souza Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Department of Electrical Engineering Federal University of Paraíba João Pessoa Paraíba Brazil

ISBN: (纸本)9781479961153

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.

关键词： Histograms Immune system Power quality Harmonic analysis Cloning Adaptive systems Computational complexity

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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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Brazilian Power Electronics Conference, COBEP

作者： A. M. Maciel C. B. Jacobina V. B. Melo E. C. dos Santos E. L. L. Fabrício Instituto Federal da Paraíba PB Brazil Electrical Engineering Department (DEE) Federal University of Camnina Grande (UFCG) Camnina Grande PB Brazil Post-Graduate Program in Electrical Engineering-PPgEE-COPELE Department of Electrical and Computer Engineering IUPUI

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.

关键词： Control systems Topology Capacitors Voltage control Shunts (electrical) Pulse width modulation Integrated circuit interconnections

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A comparison of techniques and technologies for SSVEP classification

A comparison of techniques and technologies for SSVEP classi...

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Biosignals and Biorobotics Conference (BRC), ISSNIP

This paper presents the evaluation of seven techniques of feature extraction (PSD, F-Test, EMD, MCE, CCA, LASSO and MSI) for gaze-target detections in a SSVEP-based BCI. Two type of technologies for visual stimulation were used (LCD and LEDs). Five differents windows lengths (1, 2, 4, 5 and 10 s) were used and seven volunteers participated in this study. The highest accuracy obtained in all cases was 93.57% using LEDs and the highest ITR was 36.90 bits/min for LCD. The technique based on MSI shows the highest success rate in both cases (LCD or LED) and is even more noticeable when the window size is increased.

关键词： Feature extraction Light emitting diodes Electroencephalography Correlation Electrodes Visualization Accuracy

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Asymmetrical cascaded three-phase AC-DC converters with injection transformers

Asymmetrical cascaded three-phase AC-DC converters with inje...

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IEEE Energy Conversion Congress and Exposition

作者： Joao Paulo R. A. Mello Cursino B. Jacobina Post-Graduate Program in Electrical Engineering (PPgEE/COPELE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil

ISBN: (纸本)9781509029990

In this paper, three configurations of three-phase ac-dc cascaded converters are presented. They are referred as basic configurations, and are composed by two three-phase bridges, where the second bridge is cascaded to the first by means of a three-phase injection transformer. Basic configurations have one bidirectional option (composed only by IGBT switches), and two unidirectional ones (composed by IGBT and diodes). Their generalizations, which are composed by an indefinite number of cascaded three-phase bridges, are also proposed. Each additional cascaded bridge is a three-phase IGBT bridge and requires one additional three-phase injection transformer. Transformers turns ratios are calculated in order to maximize the number of levels produced in the ac side of each rectifier, enhancing power quality. Basic configurations are compared by means of simulations between themselves and with the conventional three-phase IGBT bridge, to show that proposed multilevel rectifiers present better performance in terms of ac power quality drew from the ac source, with lower semiconductor losses. Experimental results are also exposed for the basic configurations to validate them and show their feasibility.

关键词： Bridge circuits Insulated gate bipolar transistors Topology Semiconductor diodes Legged locomotion Integrated circuit modeling Mathematical model

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Multilevel Single-Phase PWM Converters with Shared Legs and Cascaded Transformers

Multilevel Single-Phase PWM Converters with Shared Legs and ...

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IEEE Energy Conversion Congress and Exposition

作者： Joao Paulo R. A. Mello Cursino B. Jacobina Amanda P. Monteiro Post-Graduate Program in Electrical Engineering (PPgEE/COPELE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil

In this work, a family of multilevel single-phase converters is proposed. This family is based on cascaded cells, each composed by K two level legs connected to the primary windings of K - 1 transformers, while their secondary windings are cascaded to generate a multilevel voltage. Two kinds of cells are considered: the shared leg (SL), in which one leg is connected to all transformers, and the multiple shared legs (MSL), which has various legs each shared between two transformers. The turns ratios of th transformers can be calculated in order to give each pole voltage a different voltage gain in the secondary side. This causes the legs and transformers to be asymmetrical, increasing the levels-per-switch generated. The generalized model, turns ratio calculation and PWM design are provided for proposed converters composed by M SL or MSL cells. By means of simulation and experimental results, two topologies within proposed family are analyzed, one composed by one SL cell, and the other by one MSL cell, both with four legs. They are compared to the conventional cascaded h-bridge (CHB) with two bridges and corresponding isolation transformers. Various cases of asymmetry are considered, and results are analyzed to show that the configurations within the proposed family can provide better performance than the CHB in terms of switching stress and harmonic distortion.

关键词： Legged locomotion Switches Windings Pulse width modulation Topology Guidelines Harmonic distortion

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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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