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Modeling and control of the modular multilevel cascade converter based on chopper-cells

Modeling and control of the modular multilevel cascade conve...

引用

Brazilian Power Electronics Conference, COBEP

作者： B. E. O. B Luna C. B. Jacobina A. C. Oliveira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) PB Brazil

This paper presents the modular multilevel cascade converter (MMCC) based on chopper-cells suitable to medium and high voltage systems without line-frequency transformers. This converter is characterized by a modular arm structure composed by cascaded chopper-cells with floating dc capacitors. The arm structure requires average voltage control and voltage-balancing control of the dc capacitors. This paper proposes a continuous model and a control method to achieve rigid and stable voltage control of all the floating dc capacitors under common operating conditions. The validity of the theory is confirmed by computer simulation and experiment.

关键词： Capacitors Voltage control Power harmonic filters Harmonic analysis Equations Pulse width modulation Mathematical model

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OPEN-END WINDING PERMANENT MAGNET SYNCHRONOUS GENERATOR SYSTEM WITH REDUCED CONTROLLED SWITCH COUNT

OPEN-END WINDING PERMANENT MAGNET SYNCHRONOUS GENERATOR SYST...

引用

Brazilian Power Electronics Conference

作者： Cursino B. Jacobina Nady Rocha Nustenil S. M. L. Marinus Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Electrical Engineering Department (DEE) Federal University of Paraiba (UFPB)

ISBN: (纸本)9781479902712

This paper presents an open-end winding permanent magnet synchronous generator system with reduced controlled switch count, which may be applied to Wind Energy Conversion Systems (WECS). The configuration is obtained from the blend of a three-phase controlled rectifier (composed only of controlled switches), a non-controlled rectifier (composed only of diodes) and an open-end winding machine. A detailed model and a PWM control strategy of the systems, including the synchronism technique are presented to ensure the elimination of zero-crossover distortion normally caused by the use of diodes. Simulation and experimental results are also presented.

关键词： Control Power Converter Synchronous Generator

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PARALLEL AC-DC SINGLE-PHASE ASYMMETRICAL BOOST RECTIFIERS

PARALLEL AC-DC SINGLE-PHASE ASYMMETRICAL BOOST RECTIFIERS

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Nustenil S. M. L. Marinus Cursino B. Jacobina Nady Rocha Rodolpho M. B. Cavalcanti Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Electrical Engineering Department (DEE) Federal University of Paraiba (UFPB)

ISBN: (纸本)9781479940318

In this paper, three unidirectional single-phase rectifiers are proposed. Each converter is composed of two non-controlled legs and two controlled legs. Modelling and control strategy of the system, including a synchronization method, are proposed. In the synchronization method, the grid current is synchronized with the generated voltage ensuring a sinusoidal grid current without zero-crossover distortions. Analysis of harmonic distortion and semiconductor losses are presented. Simulation and experimental results are shown for validation purposes.

关键词： Topology Synchronization Voltage control Legged locomotion Harmonic distortion Inductors Semiconductor diodes

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A fast space-vector algorithm for common-mode voltage elimination in multilevel converters

A fast space-vector algorithm for common-mode voltage elimin...

引用

Brazilian Power Electronics Conference, COBEP

作者： Luis G. G. P. de Castro Maurício B. R. Corrêa Cursino B. Jacobina Post-Graduate Program in Electrical Engineering - PPgEE- COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande Campina Grande PB Brazil

This paper presents an approach that allows to apply space-vector modulation strategy to eliminate common-mode voltage in multilevel inverters. The strategy is based on the reduction of the space vector diagram and on the choice of switching states in which the common-mode voltage is zero. Results were obtained with a real-time simulator and an experimental platform of a cascaded inverter up to 11-level shows its effectiveness. The influence of dead-time over the algorithm performance is investigated too.

关键词： Inverters Vectors Switches Modulation Equations Mathematical model Switching frequency

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Models of Transit Systems for Optimization of the Grounded Vehicles Fleet

Models of Transit Systems for Optimization of the Grounded V...

引用

International Conference on computer Modeling and Simulation, UKSIM

作者： José Artur Lima Cabral Marques Fábio Nogueira da Silva João Viana da Fonseca Neto UNDB Sao Luis Maranhao Brazil DEE-Post Graduate Program in Electrical Engineering and Computer Science-PPGEE Universidade Federal do Maranhão Sao Luis Maranhao Brazil

In order to operate a public transportation system, it is necessary to plan the grounded fleet lines among the various origin/destination spread all over the city to better attend population displacement during the day, which uses the bus transportation system. To improve planning operation of the public transportation system, it is proposed a linear programming model to optimize the overall performance of transit systems, by setting the optimum buses fleet for every bus line of each company constrained to an accepted delay between any two bus stop on the bus circuit but with a minimum profit for the companies. As the routes are different for time to time during the day such as rush hour. The proposed model can cope with all the kinds of patterns during the day and the propose is to optimise the whole transportation system. It is discussed also the complexity of the nature of the dynamic of the transportation system. The mathematical modelling can show us correctly a way to qualify and quantify the routes, what helps to understand the dynamic behavior of the population through time, different situations and epochs. Simulations present the viability of implantation for real time system to estimate the transportation system as it changes.

关键词： Optimization Sociology Statistics Linear programming Vehicles Adaptation models

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Measuring the radiation bands of overhead power lines glass insulators

Measuring the radiation bands of overhead power lines glass ...

引用

IEEE Conference on Antenna Measurements & Applications (CAMA)

作者： Pedro H. V. Rocha Glauco Fontgalland PPgEE-COPELE Post-Graduate Program in Electrical Engineering Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Campina Grande-PB Brazil

In this paper the characteristics radiation of overhead power lines glass insulators is investigated. Two feeding possibilities are used to analyze the radiation effects. The first feeding point is placed on the cap of the insulator and the second one is connected to the pin. The reflection coefficient (S 11 ) for two insulators covering the band of 30 MHz to 1 GHz was measured. The measurements were performed on insulators with different conservation states: one has a metal frame in good condition and the other one has both cap and pin parts rusted. The measured results show bands with good impedance matching (30 MHz to 200 MHz). The cleaned insulator reached S 11 = -18.7 dB at 127 MHz while -10.87 dB at 121.2 MHz was obtained for the rusty insulator. These spectral bands can be used in the analysis of insulator's conservation state and its interference characteristics.

关键词： Insulators Pollution measurement Transmission line measurements Glass Magnetic fields Resonant frequency Reflection coefficient

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An embedded asterisk platform instructional design to teach voice over IP in information technology undergraduate courses: Using raspberry PI and asterisk to build an embedded portable didactic tool 7

An embedded asterisk platform instructional design to teach ...

引用

7th International Conference on computer Supported Education, CSEDU 2015

作者： Dias, M.C. Bezerra, L.C. Morais, D. Gabi, C.F. Perkusich, A. Electrical Engineering Coordination Laboratory of Telephony and Convergent Networks - LTCON Federal Institute of Education Science and Technology of Paraíba - IFPB João Pessoa Brazil Post-graduate Program in Electrical Engineering - PpgEE - COPELE Electrical Engineering Department Federal University of Campina Grande - UFCG Campina Grande Brazil

ISBN: (纸本)9789897581076

This paper shows the building of an embedded Asterisk platform as a key technique for providing Information Technology classes with an extra laboratorial environment for learning Voice over Internet Protocol. Besides building the platform, the students are asked to mount a functional telephony system with it that meets the criteria of low cost, low building complexity and high adaptability to convergent networks. The Raspberry PI version B was the board used to provide portability for the students to work outside the laboratory environment. Asterisk was presented as a useful tool on which the students could create a flexible system that could be easily deployed on convergent networks. This work was developed in the Telephony subject for the electrical engineering and the Telecommunications Systems undergraduate courses from the Federal Institute of Education, science and Technology of Paraíba - IFPB, and presented good results in the students' learning achievements.

关键词： Students

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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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AC-DC Power Conversion Systems for Open-End Winding PMSM Based on Vienna Rectifiers

AC-DC Power Conversion Systems for Open-End Winding PMSM Bas...

引用

IEEE Energy Conversion Congress and Exposition

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

This paper proposes three unidirectional ac-dc conversion power systems for wind energy conversion system (WECS) applications. These topologies are based on Vienna rectifiers and have reduced number of controlled switches, which allows reduce size, costs and is still possible to obtain low current harmonic distortion. They are composed of a series connection of two three-phase converters associated to a permanent magnet synchronous machine (PMSM) by an open-end winding (OEW) configuration. Compared with the three-phase rectifier with reduced number of controlled switches, proposed topologies offer a higher levels-per-switch ratio, allowing to achieve a sinusoidal converter current with same or lower harmonic content. Besides this, they can offer lower switch blocking voltage. These characteristics make them very interesting options to the manufacturers due to reduced costs and better power quality offered. The system model, PWM technique and control strategy are discussed. Simulation and experimental results are provided in order to validate their performance and feasibility.

关键词： Wind energy conversion system Vienna rectifiers unidirectional rectifiers

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Shunt Compensator Based on Three-Phase Interconnected Converters

Shunt Compensator Based on Three-Phase Interconnected Conver...

引用

IEEE Energy Conversion Congress and Exposition

作者： C. B. Jacobina E. L. L. Fabricio A. V. G. Menezes M. B. R. Correa G. A. A. Carlos Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) 58429-900 Campina Grande - PB - Brazil

ISBN: (纸本)9781479903375

This paper investigates a three-phase shunt power filter based on three standard three-phase interconnected converters. Compared with the usual three-phase shunt filter, the proposed converter permits to reduce the dc-link voltages and reduce either harmonic distortion or switching frequency. Control strategies suitable to control the filter and circulating currents as well as the three dc-link voltages are presented. A PWM strategy is designed to command the converter according to the reference voltage generated by the controllers. Simulation and experimental results are presented.

关键词： standard three-phase three reference Converters voltage reference circulating current shunt Shunts (electrical) link voltage Harmonic distortion DC link Filters DC link voltage VOLTAGE

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