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Estimation of Angular Speed and Park Matrix from Resolver Position Sensor Signals without Using Trigonometric Functions

Estimation of Angular Speed and Park Matrix from Resolver Po...

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IEEE International Congress on Electronics, electrical engineering and Computing (INTERCON)

作者： Raymundo Cordero García João Onofre Pereira Pinto Alex Butinhol Belini Department of Electrical Engineering Federal University of Mato Grosso do Sul Mato Grosso do Sul Brazil Post-Graduation Program in Electrical Engineering Federal University of Mato Grosso do Sul Mato Grosso do Sul Brazil

Resolver is an angular position sensor widely used in electric/hybrid vehicles and robotics. However, estimating the angular position and speed from resolver outputs is as difficult task. Most algorithms in literature use trigonometric functions to estimate the angular position. However, these functions are difficult to implement, especially in FPGAs. On the other hand, in speed vector control of three-phase motors, the angular position is only used to estimate the mechanical speed and Park transformation matrix. This paper presents a simple technique to get the mechanical speed and Park matrix without calculating trigonometric functions and without estimating directly the angular position. Filtering and synchronous demodulation allows obtaining the sine and cosine of the angular position, while the compensation of the delay produced by filtering and the estimation of the Park matrix are done using simple trigonometric properties and taking advantage that the number of pole pairs is an integer number. Experimental results show the accuracy of the proposed approach.

关键词： Signal resolution Estimation Delays Band-pass filters Synchronous motors Frequency estimation

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Analysis, Design and Implementation of an Isolated Full-Bridge Converter for Battery Charging

Analysis, Design and Implementation of an Isolated Full-Brid...

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Brazilian Power Electronics Conference

作者： Edivan Laercio Carvalho Emerson Giovani Carati Jean Patric da Costa Carlos Marcelo de Oliveira Stein Rafael Cardoso Federal University of Technology - Paraná - UTFPR Pato Branco - PR Brazil Static Power Converters Engineering Research Group - ECEE Post-Graduation Program in Electrical Engineering - PPGEE Pato Branco PR Brazil

This paper purposes the development of an isolated battery charger. In energy storage systems, these devices are essential, performing batteries charging in the way to maintain their lifecycle and safety since they are main responsible for the costs associated with these systems. In many works theses circuits are implemented through bidirectional Full-Bridge converters. These converters require auxiliary circuits to reduce their switching losses. However, circuits such as snubbers or voltage clampers are not adequately addressed in these works since their use is undesirable for bidirectional operation. To eliminate these circuits in isolated converters, this work presents a switching technique applied in a Full-Bridge converter with the objective to reduce overvoltage in semiconductors and make it suitable for use in bidirectional converters, as in the charge of battery banks.

关键词： Charge controllers Batteries chargers Isolated converters Snubber less converter

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FC and PV emulation by buck converter based on experimental VxI curves and dynamic response

FC and PV emulation by buck converter based on experimental ...

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Brazilian Power Electronics Conference, COBEP

作者： Jordan G. Trapp Luciano P. de Lima Felix A. Farret Felipe T. Fernandes Gleisson Balen Center of Studies in Energy and Environment (CEEMA) Post-Graduation Program in Electrical Engineering (PPGEE) Technological Center Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

This paper presents an emulation of fuel cell and photovoltaic modules based on the buck converter as a replacement of actual power sources for bench tests. This approach is suitable for power electronic designs involving power converters to interface source and DC loads or source and mains grid, without having available the real source. The output voltage of the buck converter is referred to lookup tables/equations with experimental data from actual sources under load variation to determinate the biasing curves and dynamic response. To validate the results, a comparison between simulated and practical results obtained from laboratory test with actual sources is performed. The energy source emulations with buck converters is a simple, safe, versatile, and effective way of physically representing DC sources for various laboratory tests.

关键词： Radiation effects Voltage control Mathematical model Fuel cells Transfer functions Emulation Laboratories

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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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Modified Wilkinson Power Divider and dipole antenna for beamforming systems at 5.8 GHz

Modified Wilkinson Power Divider and dipole antenna for beam...

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International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

作者： T.C. Albuquerque R.C.S. Freire A.J.R. Serres T.L.V.N. Silva J. Walheim F. Podevin F. Burdin P. Ferrari T. P. Vuong IMEP-LAHC Université Grenoble-Alpes Grenoble France Post Graduation Program in Electrical Engineering (PPGEE-UFCG) Federal University of Campina Grande (UFCG) Federal Institute of Paraiba (IFPB) Paraiba Brazil

Beamforming front-ends are an attractive technology because it concentrates its radiated power in one direction, which can improve energy efficiency and reduce undesirable interference. In this context, electronic beamforming systems have lower cost than mechanical ones. Knowing the uses of directive antennas and power dividers in electronic beamforming systems, this work aims at the design, simulation and measurements of these components at 5.8 GHz. Measurements with Power Divider showed very good return and insertion losses at 5.8 GHz: S 11 = -23.5 dB and S 21 = -3.8 dB. A printed dipole antenna was then fabricated, presenting -14.6 dB of return losses and a 2.82 dBi gain. Later, a 2-antenna beamforming front-end was implemented, proving the beamforming capability with the proposed devices. It also presented S 11 = -15.7 dB, and a high directive gain (10.3 dBi). Since this is still a preliminary work, the results presented are very promising.

关键词： Antenna measurements Dipole antennas Array signal processing Antenna radiation patterns Power dividers Gain Directive antennas

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Computing derivatives in interval type-2 fuzzy logic systems trained by steepest descent method for fault classification in a switch machine

Computing derivatives in interval type-2 fuzzy logic systems...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Eduardo P. de Aguiar Renan P. F. Amaral Marley M. B. R. Vellasco Moisés V. Ribeiro Industrial and Mechanical Engineering Departmant and Electrical Engineering Post-Graduation Program Federal University of Juiz de Fora Juiz de Fora/MG Brazil Electrical Engineering Department Pontifical Catholic University of Rio de Janeiro Rio de Janeiro/RJ brazil

ISBN: (纸本)9781509060351

A switch machine is an electromechanical device that allows railway trains to be guided from one track to another. Among all possible faults that can occur in a switch machine, the three mains ones are: lack of lubrication, lack of adjustment and malfunction of a component. Aiming to classify these faults, an important contribution of this work is to address the height type-reduction and interval singleton type-2 fuzzy logic system derivatives. The computational simulations are performed with real data set provided by a Brazilian company of the railway sector. The obtained results are compared with other models reported in the literature (Bayes theory, multilayer perceptron neural network and type-1 fuzzy logic system), demonstrating the effectiveness of the proposed classifier and revealing that the proposal is able to properly handle with uncertainties associated with the measurements and with the data that are used to tune the parameters of the model. In addition, the convergence speed and performance analysis show that the proposed interval singleton type-2 fuzzy logic system is attractive for classifying faults in a switch machine.

关键词： Fuzzy logic Switches Feature extraction Mathematical model Lubrication Training Uncertainty

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Preliminary comparison of different neural-fuzzy mappers for load curve short term prediction

Preliminary comparison of different neural-fuzzy mappers for...

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Seminar on Neural Network Applications in electrical engineering

作者： Dzenana Malkocevic Tatjana Konjic Vladimiro Miranda TEMPUS CEFES post-graduation program Universities of Tuzla (BiH) Novi Sad Serbia Faculty of Electrical Engineering University of Tuzla Bosnia and Herzegovina INESC Porto research institute University of Porta Portugal

This paper is written with the didactic purpose of exploring and indicating possibilities to power companies in the Balkan region for the application of adaptive neuro-fuzzy inference system (ANFIS) models in load prediction with real load data set. ANFIS models were trained and tested using 15-minute load data collected in Portugal by the electric power company EDP during a 42 day period. Simulation results gave promising results especially considering small size of used data set. Although the objective of the paper is to demonstrate possibilities for practical implementation, further research and improvement including the contributions of similar approaches in the world must be done

关键词： Power system modeling Load forecasting Power system dynamics Adaptive systems Predictive models Power system control Power system planning Neural networks Fuzzy systems Power systems

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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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An online coherence-based BCI for driving a mechanical arm

An online coherence-based BCI for driving a mechanical arm

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Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Marcos Antônio Abdalla Marcio Falcão Santos Barroso Leonardo Bonato Felix Post-Graduation Engineering Program Federal University of São João del Rei Sao Joao del Rei Minas Gerais Brazil Department of Electrical Engineering Federal University of Viçosa Vicosa Minas Gerais Brazil

The present work describes the simulation to be used in the control of a mechanical arm using a Visual Evoked Potential to drive a Brain Computer Interface system. The signal processing and classifying was done using the Multiple Coherence K 2 N . The proposed classifier was able to detect the difference between four different frequencies presented at the same time. The Multiple Coherence classifier had a hit rate of 95%.

关键词： Coherence Electroencephalography Signal to noise ratio Brain modeling Equations Mathematical model

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A multicriteria approach for meter placement in monitoring of smart distribution systems

A multicriteria approach for meter placement in monitoring o...

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International Universities Power engineering Conference (UPEC)

作者： Rafael G. Milbradt Luciane N. Canha Pedro B. Zorrilla Alzenira R. Abaide Paulo R. Pereira Sandro M. Schmaedecke Post-Graduation Program in Electrical Engineering Federal University of Santa Maria-UFSM Santa Maria Brazil State Company of Electric Power Distribution of Rio Grande do Sul CEEE-D Porto Alegre Brazil

One of the principles of Smart Grids is to have a communication network that will integrate equipment allowing the monitoring and operation to be performed in real time in order to improve the quality indicators. However, this migration to an automated and monitored environment will demand many resources that will be used to perform the migration gradually. Therefore, this work proposes a methodology for allocation of meters with the function of improving the accuracy of state estimation algorithms, but also considering other selection criteria, given the fact that many of automation equipment such as reclosers, automated switches, voltage controllers also perform the function of meters. The paper demonstrates the implementation of a state estimator based on the WLS method, which serves as the basis for the analysis of quantitative criteria such as the accuracy of the estimator, losses, voltage levels and reliability. Thus, the criteria are analyzed considering the needs defined by experts through the Analytic Hierarchy Process, so alternatives of locations and equipment can be prioritized. Finally, the methodology is demonstrated by experimental evaluation on a real feeder.

关键词： Indexes State estimation Accuracy Monitoring Measurement uncertainty Reliability Investment

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