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Repetitive control techniques applied to uninterruptible power supplies

Repetitive control techniques applied to uninterruptible pow...

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IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Claudio Lucas Gnoatto Alcir Scarmin Emerson Giovani Carati Electrical Engineering Post-Graduation Program (PPGEE) Federal University of Technology Parana Pato Branco Parana Brazil

This paper presents recent repetitive control (RP) techniques applied to uninterruptible power supplies (UPS). A proportional-derivative (PD) technique including a feedforward term is implemented as the main controller. In addition, recent repetitive control laws are presented and applied to a single phase PWM inverter. It is also presented a new RP approach for repetitive gain adaptation in the presence of cyclic and random disturbances. Results demonstrate the efficiency of each control approach.

关键词： Uninterruptible power systems Strontium Robustness Pulse width modulation Inverters Load modeling Transient response

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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...

引用

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 ...

引用

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...

引用

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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RepoSDN: An repository organization and coordination method of software defined networks applications

RepoSDN: An repository organization and coordination method ...

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IEEE Symposium on Network Operations and Management

作者： Rômulo S. Pinheiro Billy A. Pinheiro Rafael P. Esteves Antônio J. G. Abelém Computer Science Post-graduation Program (PPGCC) Federal University of Pará (UFPA) Electrical Engineering Post-graduation Program (PPGEE) Federal University of Pará (UFPA) Federal University of Rio Grande do Sul (UFRGS)

ISBN: (纸本)9781479909117

programmability is one of the key factors on software defined networks (SDN), once it allows to decouple between data plan and control plan. However, in such context, managing several applications' inputs and outputs is a little explored task on controllers field, which are not in a controlled and organized environment. This article proposes a method to make SDN applications to reach the administrator, allow him to manage his use in the network. This proposal is validated through performance tests in the repository, which stores the applications, along with developed modules to help its management and control, making the organization and coordination method safe, efficient and adjustable to any controller on software-defined network.

关键词： Software Computer architecture Organizations Servers Hardware Process control Standards organizations

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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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Towards System Security: What a Comparison of National Vulnerability Databases Reveals

Towards System Security: What a Comparison of National Vulne...

引用

Iberian Conference on Information Systems and Technologies (CISTI)

作者： Igor Forain Robson de Oliveira Albuquerque Rafael Timó teo de Sousa Jú nior Electrical Engineering Department Professional Post-Graduation Program in Electrical Engineering - PPEE Faculty of Technology University of Bras&#x00ED lia (UnB) Bras&#x00ED lia Brazil

System vulnerabilities are ubiquitous nowadays. In 2021, millions of cyberattacks exploited system flaws resulting in billions of losses. Despite massive vulnerability databases supported by the USA and China governments, there are still several unknown issues between them. This paper proposes a methodology to compare the National Vulnerability Database (NVD), the China National Vulnerability Database (CNVD), and the China National Vulnerability Database of Information Security (CNNVD). The results reveal that the CNNVD has 1,661 vulnerabilities entries more than the NVD and at least 40 more entries regarding Chinese vendors. Moreover, there is a temporal correlation of 0.917560 between the NVD and CNNVD. To the best of the authors’ knowledge, this work is the first to normalize and compare the NVD, CNVD, and CNNVD using their data feeds.

关键词： Measurement Correlation Databases XML Legislation Information security Software

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Integration of alternative sources of energy as current sources

Integration of alternative sources of energy as current sour...

引用

Brazilian Power Electronics Conference, COBEP

作者： L. P. Lima F. A. Farret J. G. Trapp F. Z. Ferrigolo D. B. Ramos F. T. Fernandes Center of Studies in Energy and Environment (CEEMA) Post-Graduation Program in Electrical Engineering Federal University of Santa Maria Brazil

This work proposes an integration of alternative energy sources having the different generating modules connected as current sources. These sources were configured to inject current into a common DC bus. This feature avoids current circulation among sources due to the voltage differences, reducing the stress in the individual generators. A battery bank is a system part, used as an energy accumulator for periods when there is primary energy depletion. The bus voltage is controlled by modulation of a secondary load in parallel with the main load. A DC-DC Boost converter connects each primary source to a common bus, except for the storage system that uses a DC-DC Buck-Boost converter. Finally, it is presented a mathematical analysis through simulated results to show the sources behavior and overall performance when turned into current sources.

关键词： Generators Load modeling Mathematical model Transient analysis Voltage control Inductors Wind power generation

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Specific absorption rate (SAR) in the head of Google glasses and Bluetooth user's

Specific absorption rate (SAR) in the head of Google glasses...

引用

IEEE Latin-American Conference on Communications, LATINCOM

作者： Y. A. A. Pizarro A. A. de Salles S. Severo J. L. T. Garzón S. M. R. Bueno Post-graduation program in electrical engineering Federal University of Rio Grande do Sul Porto Alegre RS Brazil

Two popular wireless communication devices are considered in this paper. Firstly, the Bluetooth which is one of the most popular mobile accessories and the Google glasses which are a representation of the new futuristic vision. It is well known that the absorption of electromagnetic waves on the human head for a certain period of time may lead to health problems such as headaches, or even worse, brain cancer. The Specific Absorption Rate (SAR) is simulated for three different head models and compared with the available international recommendations. The first model used is the Specific Anthropomorphic Mannequin (SAM phantom), as well as two realistic models of human head (i.e., a 34 years old adult and a 10 years old child). The simulations were performed using the finite difference time domain (FDTD) method and the frequency used to feed the antennas was 2.45 GHz.

关键词： Google Antennas Glass Bluetooth Phantoms Magnetic heads Head

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Empirical ARMA Indoor Propagation Model for WLAN Signals in 2.4GHz

Empirical ARMA Indoor Propagation Model for WLAN Signals in ...

引用

European Conference on Antennas and Propagation

作者： Ramz L. Fraiha Lopes Allan B. Costa Herminio S. Gomes Nadson W. P. Souza Bruno W. Martins Gervasio P. S. Cavalcante Institute of Technology - Electrical Engineering Post Graduation Program Federal University of Pará - UFPA Belém - PA Brazil

ISBN: (纸本)9781467321877

Representing the signal power at a studied environment through a mathematical model is one major challenge of signal propagation study. In this work is proposed an empirical Autoregressive Moving-Average (ARMA) model for signal strength prediction in indoor environments. A Genetic Algorithm (GA) was employed to calibrate the model (finding coefficients), thus, allowing future improvements without major changes to the program source code.

关键词： WLAN ARMA model Indoor Propagation Genetic Algorithm wireless local area network (WLAN) Genetic Algorithm (GA) Source code signal power propagation Propagation signals INDOORS

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