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DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix Inverter

DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix...

引用

European Conference on Power Electronics and Applications

作者： Ailton do E. Dutra Montiê A. Vitorino Maurício B. R. Corrêa Post-Graduate Program in Electrical Engineering (PPgEE-COPELE) FEDERAL UNIVERSITY OF CAMPINA GRANDE (UFCG) Campina Grande PB Brazil

In this work it is proposed a multilevel T-type configuration for a high-frequency pulsating DC-link inverter for three-phase applications. The configuration consists of two DC/DC-pulsating converters cascaded with a DC-link capacitor-less three-phase three-level T-type inverter. Due to the absence of DC-link electrolytic capacitors, the proposed inverter guarantees a long lifetime and high power density. The DC-DC-pulsating converters aim to generate the high-frequency pulsating DC-link waveform profiles which have to be synchronized with the three-phase inverter PWM. Comparing to the conventional PWM, the proposed technique presents reduced switching losses due to the fact only one leg commutes during a switching period while the other two legs keep clamped in high or low impedance. Details of control strategy and modulation are presented, such as experimental results to validate the theoretical approach.

关键词： Inverters Legged locomotion Europe Capacitors Pulse width modulation

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Four-Port AC/DC-DC/AC Dual Active Bridge Based Converter

Four-Port AC/DC-DC/AC Dual Active Bridge Based Converter

引用

European Conference on Power Electronics and Applications

作者： Diego A. Acevedo-Bueno José D. G. da Silva Jonatas R. Kinas Montiê A. Vitorino Antonio M. N. Lima Edison R. C. da Silva Alexandre C. Oliveira Post-Graduate Program in Electrical Engineering (PPgEE – COPELE) FEDERAL UNIVERSITY OF CAMPINA GRANDE (UFCG) Campina Grande PB Brazil

In this paper, a Four-Port AC/DC-DC/AC conversion system is proposed using two full-bridge converters and a high-frequency transformer following the principle of Dual Active Bridge Converter. Two full-bridge AC/DC single-phase converters are connected by coupling their boost inductance to create a high-frequency transformer of the resulting proposed converter. The isolated power transfer between converters is controlled by the duty cycles and the phase-shift applied to the primary and secondary of the split transformer. The boundaries of the switching modes and the power transferred through the high-frequency transformer were obtained analytically. The system feasibility was validated by simulations and by a 300 W prototype with 94.9% maximum efficiency.

关键词： Bridge circuits Inductance Europe Windings Magnetization Switches Boundary conditions

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Hybrid Converter with Reduced DC-link Voltage Using an H-Bridge Cell for Split-Phase Power System

Hybrid Converter with Reduced DC-link Voltage Using an H-Bri...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Bruna S. Gehrke Cursino B. Jacobina Italo R. F. M. P. da Silva Reuben P. R. Sousa Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) – Campina Grande - PB - Brazil Academy Unit of the Cabo de Santo Agostinho Federal Rural University of Pernambuco (UFRPE) Cabo de Santo Agostinho PE Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper presents a single-phase to single-phase three-wire converter, which comprises a conventional two-level(2L) four-leg converter in series with H-bridge. The H-bridges are supplied from the main converter by means of a DC-DC converter with a high-frequency transformer. The proposed converter: (i) can supply three loads, wherein two are phase voltages 180 degrees-lagged, and a third load with twice the amplitude of the phase voltage, (ii) has the output voltages with constant frequency and amplitude even under unbalanced loads, and (iii) has sinusoidal grid current and high-power factor even supplying nonlinear loads. In this way, the proposed system is suitable for uninterruptible power supply. Furthermore, the pulsewidth modulation (PWM) technique is proposed to generate the pole voltages of the converters, so that the output voltages have better power quality. The proposed converter is compared with a conventional 2L in terms of harmonic distortion. Simulated results are provided to verify the operation of the proposed system.

关键词： Voltage control DC-DC power converters Pulse width modulation Frequency conversion Legged locomotion Uninterruptible power systems

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Three-Phase Integrated PFC AC-AC Resonant Inverter with Weak Coupled Coils for Induction Heating Application

Three-Phase Integrated PFC AC-AC Resonant Inverter with Weak...

引用

IEEE Energy Conversion Congress and Exposition

作者： Ruan C. M. Gomes Montie A. Vitorino Diego A. Acevedo-Bueno Mauricio B. R. Correa Post-Graduate Program in Electrical Engineering (PPgEE–COPELE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil

This paper proposes a 4.3 kW three-phase integrated PFC AC-AC resonant inverter for Induction Heating (IH) Application. This converter is composed by three independent resonant inverters with non-smoothed DC link that achieves high power factor operation. The magnetic coupling of the three coils was modeled by using the impedance matrix for characterizing the resonant behavior of the arrangement. The coils arrangement with weak coupling between coils is applied for induction water heater. Experimental results validate the modes of operation with ZVS and the converter performance in the entire power input range (PF and THD).

关键词： Coils DH-HEMTs Magnetic noise Magnetic resonance Magnetic shielding Couplings Impedance

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Single-Phase Six-Switch Universal Active Power Filter 10

Single-Phase Six-Switch Universal Active Power Filter

引用

10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018

作者： Rodrigues, Phelipe L.S. Jacobina, Cursino B. Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Brazil Campina Grande Paraíba58429-900 Brazil

ISBN: (纸本)9781479973118

In this paper, three structures were developed and analyzed, these configurations are based on three-leg ac/dc/ac converters operating as a universal active power filter (UAPF) also known as unified power quality conditioner (UPQC). The proposed configurations are appropriate for a voltage sag/swell compensation, reactive power compensation, reducing losses and switches, as well as for applications where the input voltage is twice the output voltage, for example, applications in systems in Brazil where the voltages vary between 220 V (rms) and 110 V (rms) from one state to another. The proposed six-switch single-phase UAPF are compared with the conventional three-leg and four-leg single-phase UAPF solutions. The pulsewidth modulation (PWM) and control techniques are developed and presented. For validation purposes, the simulation and experimental results for proposed configurations are shown. © 2018 IEEE.

关键词： Pulse width modulation

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Three-Leg Single-Phase Universal Active Power Filter 10

Three-Leg Single-Phase Universal Active Power Filter

引用

10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018

作者： Rodrigues, Phelipe L. S. Jacobina, Cursino B. PPgEE COPELE Post-Graduate Program in Electrical Engineering Brazil Campina Grande Paraíba58429-900 Brazil

ISBN: (纸本)9781479973118

This paper presents a topology based on three-leg ac-dc-ac converters for active power filter (APF) applications. The proposed configuration is appropriate for voltage sag/swell compensation, reactive power compensation, and for reducing losses and the number of switches. The proposed three-leg single-phase universal active power filter (UAPF) is compared with conventional four-leg and three-leg single-phase UAPF solutions. Pulsewidth modulation (PWM) and control techniques are developed and presented. For validation purposes, simulation and experimental results of proposed configurations are shown. © 2018 IEEE.

关键词： Pulse width modulation

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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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Universal Active Power Filter Based on Three Three-Leg Converters and a Single DC-link

Universal Active Power Filter Based on Three Three-Leg Conve...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Phelipe L. S. Rodrigues Cursino B. Jacobina Andre E. L. Costa Ítalo A. Cavalcanti de Oliveira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) Paraíba Brazil Department of Electrical Engineering Federal University of Campina Grande (UFCG) Paraíba Brazil

This paper presents a universal active power filter (UAPF) for harmonic and sag/swell voltage compensation based on the nine-leg converter and a single dc-link. The proposed UAPF combines three three-phase converters operating as series-shunt-series filters. An SV-PWM technique was used to improve the voltage levels generated by the converters by obtaining multilevel voltages. The connection made in the topology proposed in this paper allows an improvement in the harmonic distortions as well as the semiconductors losses. The complete control system is developed, simulation and experimental results are shown for validation purposes.

关键词： Topology Harmonic analysis Impedance Harmonic distortion Load modeling Active filters Power system harmonics

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Cascaded Multilevel Rectifiers with Reduced Number of Controlled Switches for Open-End Winding PMSM

Cascaded Multilevel Rectifiers with Reduced Number of Contro...

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 Campina Grande Paraíba Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil

This paper proposes three configurations of unidirectional open-end winding (OEW) cascaded multilevel rectifiers with reduced number of controlled switches. They are based on Vienna rectifiers and are composed of a series combination of two three-phase converters and three H-bridges employing floating capacitors (per phase). These configurations make the ac-dc conversion power, supplied by a permanent magnet synchronous machine (PMSM), which is connected to the rectifier by an OEW configuration. Compared to the conventional, proposed systems synthesize the same or higher number of voltage levels using fewer number of controlled switches and is still possible to obtain lower converter current harmonic distortion. Furthermore, they can operate with lower switch blocking voltage ratio. These features make them attractive options to the industry due to their low costs, low control complexity and size, besides they are more reliable and less prone to failure. Therefore, proposed configurations have a better cost-benefit than conventional one. The system model, PWM technique, capacitor voltage balancing and control strategy are given. Simulation and experimental results are provided in order to validate their feasibility.

关键词： Capacitors Voltage control Switches Reliability Topology Bridge circuits

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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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