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Comparison of sensorless techniques based on Model Reference Adaptive System for induction motor drives

Comparison of sensorless techniques based on Model Reference...

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Brazilian Power Electronics Conference, COBEP

作者： Diego D. Pinheiro Carlos M. O. Stein Jean P. Costa Rafael Cardoso Emerson G. Carati PPGEE - Program of Post-Graduation in Electrical Engineering ECEE Research Group on Static Converters Engineering Pato Branco Parana Brazil

This paper presents a comparison of sensorless vector control strategies for Induction Motor (IM). The strategies includes an Indirect Field Orientation Control (IFOC) and a Model Reference Adaptive System (MRAS). Several studies have been proposed in the literature concerning different approaches of MRAS estimators. In this work, an evaluation is performed of three MRAS approaches for estimate the rotor speed from different models: rotor flux, back electromotive force (back-EMF) and instantaneous reactive power. Matlab simulations are performed to test the proposed strategy for different speed and sensitivity of such drives to parameters variations. To verify the approach to sensorless techniques with variations of speed in real conditions a drive for the prototype was assembled and experimental results are presented.

关键词： Rotors Adaptation models Estimation Mathematical model Stators Induction motors Reactive power

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Dynamic behavior of the PV Grid-connected inverter based on L and LCL filter with active damping control

Dynamic behavior of the PV Grid-connected inverter based on ...

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Brazilian Power Electronics Conference, COBEP

作者： F. L. Paukner E. G. Carati R. Cardoso C. M. O. Stein J. P. da Costa Post-Graduation Program in Electrical Engineering - PPGEE Federal University of Technology - Parana Pato Branco PR Brazil

PV Grid-connected inverters must fulfill the standards specifications of current harmonics injected to the grid. In order to satisfy these grid requirements, passive filters are connected between the inverter and the grid. This paper compares the response characteristic of the traditional inductive (L) filter with the inductive-capacitive-inductive (LCL) filter. It is shown that the increasing the inductance L leads to a good ripple current suppression around the inverter switch frequency. The LCL filter provides better harmonic attenuation and reduces the filter size. The main drawback is the LCL filter impedance, which is characterized by a typical resonance peak, which has to be damped to avoid instability. Passive or active techniques can be used to damp the LCL resonance. To address this issue, this paper presents a comparison of passive and active damping strategies. Experimental results are given to support the theoretical analysis and to illustrate the performance of grid connected PV inverter system.

关键词： Power harmonic filters Inverters Mathematical model Resonant frequency Passive filters Inductors Damping

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Evaluation of control strategies for LCL grid-tied distributed generation systems

Evaluation of control strategies for LCL grid-tied distribut...

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Brazilian Power Electronics Conference, COBEP

作者： Rafael Zamodzki Carlos M. O. Stein Emerson G. Carati Jean P. da Costa Rafael Cardoso Post-Graduation Program in Electrical Engineering - PPGEE Federal University of Technology - Parana Pato Branco PR Brazil

The LCL filter is one of the most used filters in grid connected distributed generation. It is mainly due to its efficiency and reduced physical size when compared to a typical L filter. However, the LCL filter has an inherent resonance frequency that can lead the system to instability or power quality degradation. The converter or the grid current can be used as controlled variable in the current controller. Based in this context, this paper analyzes the stability and studies the control issues brought by the dynamics of the LCL filter. A comparative analysis of the results provided by the use of different controlled variable in the current controller is presented. An evaluation of PI and PD control is done to verify which one is the better option to be used in the current control. A theoretical analysis is carried out based in the pole-zero map of the system, Bode diagrams and numerical simulation.

关键词： Power harmonic filters PD control Resonant frequency Stability analysis Inductance Poles and zeros

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A system based on genetic algorithms as a decision making support for the purchase and sale of assets at São Paulo Stock Exchange

A system based on genetic algorithms as a decision making su...

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International Conference on Computer Vision and Image Analysis Applications (ICCVIA)

作者： Thiago Pinheiro do Nascimento Sofiane Labidi Pedro B. Neto Nadson Timbó Allison Almeida Post-graduation Program in Electrical Engineering Federal University of Maranhão - UFMA São Luís Brazil

This work aims the implementation of a system to support decision-making to buy and sells share on the São Paulo Stock Exchange. To do that it was used a genetic algorithm with the help of technical analysis indicators. The Indicators allow us to detect trends, being widely used in the prediction of prices. The prediction of high or low at the stock market is a complex problem that involves a wide range of factors, ranging from the feeling of each market participant to a natural disaster. Thus, this system is not intended to be a crucial tool for decision making, but rather a supporting tool that if in a combination with other methods of analysis (such as fundamental analysis for example) and privileged information, can provide a higher accuracy for a solution of this problem.

关键词： Stock markets Market research Security Genetic algorithms Companies Decision making

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SAR simulations of EMF exposure due to tablet operation close to the user's body

SAR simulations of EMF exposure due to tablet operation clos...

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

作者： Ferreira, Juliana Borges Almeida De Salles, Álvaro Augusto Fernández-Rodriguez, Claudio Enrique Post-graduation Program in Electrical Engineering Federal University of Rio Grande do Sul UFRGS Porto AlegreRS Brazil Electrical Engineering Department Federal University of Rio Grande do Sul UFRGS Porto AlegreRS Brazil Federal Institute for Education Science and Technology of Rio Grande do Sul IFRS CanoasRS Brazil

ISBN: (纸本)9781467394925

This paper shows an analysis of the interaction of the electromagnetic field generated by a tablet with three different models of human heads: a homogeneous model Specific Anthropomorphic Mannequin (SAM) and two heterogeneous models: an adult man and a child. The assessing dosimetric parameters used are the Specific Absorption Rate (SAR) computed by SEMCAD X. The distance between the tablet and the head models varies from 50 mm to 200 mm. The SAR decreases with the distance. The higher SAR values were obtained for SAM while the smaller for the adult. All the results are below the safety recommendations from the International Commission Non-Ionizing Radiation Protection (ICNIRP) and the Federal Communications Committee (FCC). © 2015 IEEE.

关键词： Dosimetry

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Voice pathology assessment using wavelet based on texture analysis of recurrence plots

Voice pathology assessment using wavelet based on texture an...

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International Workshop on Telecommunications, IWT 2015

作者： Souza, Taciana A. Souza, Micael A. Costa, Silvana C. Costa, Washington C. De A. Correia, Suzete E. N. Vieira, Vinicius J. D. Academic Unity of Industry - IFPB Av. Primeiro de Maio 720 Jaguaribe João Pessoa - PBCEP: 58015-430 Brazil Electrical Engineering Post-graduation Program - UFCG Rua AprigioVeloso 882 Bairro Universitário Campina Grande - PBCEP: 58429-900 Brazil

ISBN: (纸本)9781467376228

This work proposes an efficient texture classification strategy performed in the wavelet domain in order to characterize healthy and pathological speech signals from recurrence plots (RP). The two-dimensional wavelet transform is applied to the recurrence plots at one resolution level. Thirteen Haralick texture features are obtained from each approximation and detail subband coefficients. In classification, multilayer perceptron (MLP) neural networks with cross validation are employed. Classification accuracy is improved and the number of features is reduced by particle swarm optimization (PSO). Results suggest that this method may be useful for pathological voice discrimination. © 2015 IEEE.

关键词： Wavelet transforms

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INDUCTIVE FILTER DESIGN FOR THREE-PHASE GRID CONNECTED POWER CONVERTERS

INDUCTIVE FILTER DESIGN FOR THREE-PHASE GRID CONNECTED POWER...

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Brazilian Power Electronics Conference

作者： F. L. Paukner C. Nardi E. G. Carati C. M. O. Stein R. Cardoso J. P. da Costa Post-Graduation Program in Electrical Engineering - PPGEE Federal University of Technology - Parana

ISBN: (纸本)9781479987801

This paper presents a design methodology for a first order L filter inductance used to connect a three-phase power converter to the grid. This method uses the desired THD_i to calculate the L filter inductance to ensure the grid-connection standards are met. This methodology was designed for converters operating with Space Vector PWM modulation.

关键词： Inductive filter design Grid-connected three-phase inverted

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Parallel genetic algorithm with social interaction for solving constrained global optimization problems

Parallel genetic algorithm with social interaction for solvi...

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International Conference of Soft Computing and Pattern Recognition (SOCPAR)

作者： Rodrigo Lisbôa Edson Koiti Yasojima Rodrigo M. S. de Oliveira Marco A. Florenzano Mollinetti Otávio Noura Teixeira Roberto C. Limão de Oliveira Pereira Electrical Engineering Post Graduation Program Federal University of Pará (UFPA) Belém Pará Brazil Systems Optimization Laboratory Tsukuba University Tsukuba Ibaraki Japan Electrical Engineering Post Graduation Program Federal University of Pará (UFPA) Belém Pará Brazil Laboratory of Electromagnetics (LeMag) Federal University of Pará (UFPA) Belém Pará Brazil Laboratory of Bionspired Computing (LCBIO) Federal University of Pará (UFPA) Belém Brazil Pará

The following paper introduces a parallel approach to a social variant of the Genetic Algorithm, called Parallel Genetic Algorithm with Social Interaction (PSIGA). The algorithm is based on social games involving game theory, and it is implemented using the OpenMP API, which is based on the shared memory programming model for multiple processor architectures. The main contribution of this approach is the parallelization using the Shared Memory of the Social Interaction Genetic Algorithm (SIGA) in order to achieve faster and better optimality than its nonparallel counterpart for global optimization problems with restrictions. For means of performance assessment, the algorithm is tested on four instances of engineering design problems and the obtained results compared with the Genetic Algorithm with Social Interaction (SIGA) implemented in sequential programming model.

关键词： Genetic algorithms Sociology Statistics Optimization Games Game theory Instruction sets

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A NOVEL APPROACH FOR HOME APPLIANCES IDENTIFICATION USING VECTOR PROJECTION LENGTH AND STOCKWELL TRANSFORM

A NOVEL APPROACH FOR HOME APPLIANCES IDENTIFICATION USING VE...

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Brazilian Power Electronics Conference

作者： Vinicius P. Borin Carlos H. Barriquello Mario L. da Silva Martins Alexandre Campos GEDRE Research Group - Electrical Engineering Post Graduation Program (PPGEE) Federal University of Santa Maria (UFSM)

ISBN: (纸本)9781479987801

Identification of residential electrical appliances has been a highlight area of research in recent years due to increasing energy consumption in the residential sector around the world. This paper addressed a novel method for recognition of electrical appliances. Thus, it is proposed to apply the Stockwell Transform, a time-frequency domain transform, into current data collected from 17 commonly present electrical appliances in our houses. With these data, we applied an image pattern recognition technique, called Vector Projection Length. In this case, the idea is to recognize patterns in the appliances transformed into time-frequency domain. An extensive analysis technique simulation is presented here, showing the variation of the technical parameters and their influence on the results of identification.

关键词： Digital Image Processing Intelligent Systems Load Identification S-Transform Vector Projection Length

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SAR simulations of EMF exposure due to tablet operation close to the user's body

SAR simulations of EMF exposure due to tablet operation clos...

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

作者： Juliana Borges Ferreira Álvaro Augusto Almeida de Salles Claudio Enrique Fernández-Rodriguez Post-graduation program in Electrical Engineering Federal University of Rio Grande do Sul Porto Alegre RS Brazil Electrical Engineering Department Federal University of Rio Grande do Sul Porto Alegre RS Brazil Science and Technology of Rio Grande do Sul Federal Institute for Education Canoas RS Brazil

关键词： Phantoms Specific absorption rate Antennas Head computational modeling Magnetic heads Dielectrics

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