Domingos Savio Lyrio Simonetti - Academia.edu (original) (raw)
Papers by Domingos Savio Lyrio Simonetti
Energies
The growing number of renewable energy plants connected to the power system through static conver... more The growing number of renewable energy plants connected to the power system through static converters have been pushing the development of new strategies to ensure transient stability of these systems. The virtual synchronous generator (VSG) emerged as a way to contribute to the system stabilization by emulating the behavior of traditional synchronous machines in the power converters operation. This paper proposes a modification in the VSG implementation to improve its contribution to the power system transient stability. The proposal is based on the virtualization of the resistive superconducting fault current limiters’ (SFCL) behavior through an adaptive control that performs the VSG armature resistance change in short-circuit situations. A theoretical analysis of the problem is done based on the equal-area criterion, simulation results are obtained using PSCAD, and experimental results are obtained in a Hardware-In-the-Loop (HIL) test bench to corroborate the proposal. Results sh...
IEEE Latin America Transactions
Energies
A setup for testing transformers under load through low power converter is presented in this pape... more A setup for testing transformers under load through low power converter is presented in this paper. This setup is used for testing power transformers as it allows to verify their performance under operating conditions regarding aspects such as heating, voltage regulation, and mounting robustness. The main goal of the study is centered on replacing a full power Back-to-Back converter (1 pu) by a fractional power one (less than 0.1 pu). The converter, a Voltage Source Inverter (VSI), is a series connected between two equally sized transformers and controls the current flowing in the system. Load profile configurations set according to power factor, current harmonics, or even power level can be imposed to evaluate the performance of the Transformer Under Test (TUT) and the entire system. Theoretical analysis, and simulation results employing Matlab/Simulink platform, considering a typical transformer of a 75 kVA power distribution grid with 13.8 kV/220 V voltage are presented to corrob...
This paper presents a single-stage self-oscillating high-power-factor electronic ballast more sui... more This paper presents a single-stage self-oscillating high-power-factor electronic ballast more suitable for both low power levels (because it operates in discontinuous conduction mode) and low ac mains applications (since it employs an input-doubler rectifier). The electronic ballast is based on a high-frequency dither signal, which shapes the input current in a sinusoidal waveform. In order to reduce the electronic ballast components the self-oscillation technique has been employed. An electronic ballast prototype operating at 25 kHz has been implemented to drive two 40-W straight-type fluorescent lamps from a 127-V utility line. High power factor is achieved even though the electronic ballast drives just one fluorescent lamp. The experimental results demonstrated the electronic ballast operation.
Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation, and Automation, 2000
Power Factor Preregulators (PFP) have been used to improve input current waveform of off-line pow... more Power Factor Preregulators (PFP) have been used to improve input current waveform of off-line power supplies. There are two major approaches in implementing control circuits in PFP: the multiplier approach and the voltage-follower approach. The simplest one is the voltage-follower approach because the converter operates in discontinuous conduction mode (DCM), and only one loop control is required. SEPIC and CUK converters present a great advantage over boost and fly-back topologies in DCM: an input current with low harmonic content can be obtained by correctly choosing inductors L, and L, of the converter with a fixed operation frequency, as is demonstrated here. Also some discussion about the intermedium capacitor C, as well some advantages and disadvantages of the aplication is done. Simulation and experimental results support the approach. Therefore, SEPIC and CUK converters in DCM seem to be good choices to use as PFP.-Domingos S. L. Simonetti is a professor at the Departament of Electrical Engineering, Universidade Federal do Espinto Santo, Brazil. Femando S. dos Reis is a professor at the Department of Electronics, Pontificia Universidade Cat6lica do R.G. do Sul, Brazil. Both are perforaling their doctoral course at Universidad Politknica de Madrid with a scholarship from the Brazilian Agency CAPES. naturally fol~ows the sinusoidal line voltage waveform. The voltage-follower approach provides a simple control scheme, requiring Only One Using boost or buck-boost converter as PFP in discontinuous conduction mode requires an input filter, C,, because a large loop'
Electronica Unmsm, 2002
En los últimos años se ha puesto mucha atendón en la mejora de la eficiencia del control de los m... more En los últimos años se ha puesto mucha atendón en la mejora de la eficiencia del control de los motores variando la freeoeneia {Abrahamsen, 1998J, [Abrahamsen, 1996J. En el presente trabajo, uno de los objetivos específicos aplicado a una embarcadón alimentado por energía solar de alta eficiencia. es reducir los costos.
2010 9th Ieee Ias International Conference on Industry Applications Induscon 2010, Nov 1, 2010
Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344), 2002
This paper presents an electronic control gear for HID lamps that operates with a low frequency c... more This paper presents an electronic control gear for HID lamps that operates with a low frequency current inverter to drive the lamp, a DC-DC buck converter to control the current and the power of the lamp and a power factor pre-regulator based on discontinuous conduction mode boost converter. All signals of the power stages are provided by a dedicated microcontroller. An overview of the lamp operation phases and the strategies to avoid acoustic resonance are mentioned. A 70W prototype without acoustic resonance and stroboscope effect was implemented. The approach can be easily extended for other rated power.
This paper presents a high performance dc-dc switching mode power supply designed to deliver a re... more This paper presents a high performance dc-dc switching mode power supply designed to deliver a regulated 0-5OVlO-1OA output. The proposed power supply is based on a modified version of the zero voltage switching full-bridge phase-shift dc-dc converter, which incorporates commutation auxiliary inductors to provide zero voltage switching for the entire load range, as well as a commutation aid circuit to clamp the output diode voltage. The control strategy is based on two control loops operating in cascade mode. The inner loop maintains a regulated output current, whereas the external voltage loop the regulates output voltage, independently of load changes and input voltage variations. To obtain a high reliability converter, the control circuit has been implemented using just two ICs. The phase-shift regulator UC3875 IC generates the gate drive signal to the MOSFETs. The control loop regulators are implemented using the TL074 IC. Theoretical analysis and experimental results have been obtained for a 0-50VlO-lOA power supply operating at 100kHz.
A new approach to improve the input current profile of three-phase rectifiers is presented in thi... more A new approach to improve the input current profile of three-phase rectifiers is presented in this paper. To achieve this aim, an auxiliary circuit is used to impose current circulation during the time intervals that the rectifier does not absorb current. The additional switches are of low current capacity. Design equations are presented, as well as the operating characteristics. Experimental results corroborate the analysis carried out here.
Este artigo apresenta o desenvolvimento e a implementação de um conversor de alta corrente, contr... more Este artigo apresenta o desenvolvimento e a implementação de um conversor de alta corrente, controlado por microcontrolador, baseado no retificador de meia onda hexafásico. Um algoritmo de controle da corrente de carga do conversor foi desenvolvido em linguagem de montagem. O algoritmo implementa um controlador proporcional integral, PI, o qual controla a corrente de saída atuando no comando de disparo de tiristores. Foi construído um protótipo de laboratório de 6kW de potência máxima, com corrente de saída retificada de 300A e tensão média de 20V. Comparações entre resultados experimentais e resultados de simulações apontam que o modelo matemático utilizado foi adequado para a modelagem do conversor.
This paper presents a 0-30V/0-5A microcontroller-based switched-mode power supply. The proposed p... more This paper presents a 0-30V/0-5A microcontroller-based switched-mode power supply. The proposed power supply has two stages. The input stage is a boost converter as a power factor pre-regulator, which provides universal input (127- 220 V, 50/60 Hz) with power factor correction. The output stage is a two transistor forward converter, that allows voltage and current adjust. A single microcontroller is in charge of controlling the two converters, being responsible for keeping the dc bus voltage fixed (boost converter output) and adjusting the output voltage and current (forward converter output). The control loops were implemented using proportional-integral controllers. Furthermore, the microcontroller does the user interface task through potentiometers to select output voltage and current, and a liquid crystal display to show their values.
Este artigo apresenta um circuito regenerativo de ajuda a comutação magneticamente acoplado aplic... more Este artigo apresenta um circuito regenerativo de ajuda a comutação magneticamente acoplado aplicado a um conversor elevador (boost) operando no modo de condução contínua (MCC). Sua principal característica está na utilização de um indutor acoplado ao indutor principal do conversor para transferir a energia armazenada no capacitor do circuito de ajuda a comutação para a carga. Esta transferência de energia se dá de forma ressonante, fazendo com que a tensão sobre o capacitor seja nula ao final de cada período de comutação. Ao longo do artigo são apresentadas equações que descrevem o comportamento do conversor e do circuito de ajuda a comutação, bem como algumas equações de projeto. Ao final, são mostrados resultados experimentais que comprovam o elevado rendimento do conversor boost com o circuito de ajuda à comutação proposto.
Resumo Este artigo apresenta a família de conversores CC-CC PWM empregando a técnica ZVT melhorad... more Resumo Este artigo apresenta a família de conversores CC-CC PWM empregando a técnica ZVT melhorada. O circuito proposto utiliza uma célula magneticamente acoplada a fim de reduzir a perda de comutação durante o bloqueio do interruptor auxiliar. É apresentada uma metodologia de projeto que permite obter de forma rápida e fácil os valores dos elementos de ambas as células, ZVT e de ajuda à comutação do interruptor auxiliar. Também são apresentados resultados de simulação para cada um dos conversores propostos, bem como resultados experimentais obtidos a partir da construção de um protótipo de 500W / 100kHz do conversor boost. Os resultados apresentados demonstram os benefícios alcançados a partir do uso da célula regenerativa proposta. Abstract This paper presents the DC-DC PWM converters family employing the improved ZVT technique. The proposed cir-cuit uses a magnetically coupled cell to reduce the turn-off switching loss of the auxiliary switch. A design procedure is pre-sented, fr...
Duty-cycle modulation of single-switch three-phase boost rectifiers has been demonstrated to be a... more Duty-cycle modulation of single-switch three-phase boost rectifiers has been demonstrated to be an effective way to reduce their input current harmonics. But a converter design methodology for such control approach is not available yet. This paper intends to fulfill this lack, presenting a design approach for this operation mode. Design equations are provided for some operation conditions, and experimental results validate the approach.
This paper presents an electronic control gear for metal halide lamps that operates with a low fr... more This paper presents an electronic control gear for metal halide lamps that operates with a low frequency current inverter to drive the lamp, and a DC-DC buck converter to control the lamp current and the power. All signals of the power stages are provided by a dedicated microcontroller. An overview of the lamp operation phases and the strategies to avoid acoustic resonance are mentioned. A 70W prototype without acoustic resonance and stroboscope effect was implemented. The approach can be easily extended for other rated power and other high intensity discharge lamps.
This paper presents the use of a magnetically coupled regenerative turn-on and turn-off snubber c... more This paper presents the use of a magnetically coupled regenerative turn-on and turn-off snubber configuration aplied WR D 6HSLF DQG ûXN FRQYHUWHUV RSHUDWLQJV LQ FRQWLQXRXV FRQGXFWLRQ PRGH �&0�� 7KH SURSRVHG VQXEEHU XVHV WKH PDLQ FRUH RI the DC-DC converter to build the resonant inductor. In addition to reducing the stresses in the switch, providing soft transitions in its turn-off voltage and turn-on current, it transfers the energy stored in the snubber capacitor to the output (load) or input. An analytical study of the converters is presented. Experimental results are shown for a proposed structure.
Low switching-frequency converters are a good alternative if weight and size are not a restrictio... more Low switching-frequency converters are a good alternative if weight and size are not a restriction. Their main features are reduced EMI emission and low switching losses. This paper performs a comparison among three low-switching frequency three-phase rectifiers. Some new important information are introduced in the paper, such as a dynamical model to design the control loop and components rating. Experimental results complete the exposition.
Uma nova técnica de modulação da razão cíclica aplicada a retificadores trifásicos elevadores com... more Uma nova técnica de modulação da razão cíclica aplicada a retificadores trifásicos elevadores com um interruptor é apresentada neste artigo. A diferença com respeito à solução inicial similar é que a modulação da razão cíclica é feita por multiplicação de sinais, e não por soma. Desta forma, o conteúdo harmônico de baixa freqüência permanece constante independente do valor de carga. Resultados experimentais permitem comparar a solução proposta (modulação por multiplicação) com a original (modulação por soma), e validam a técnica apresentada.
Energies
The growing number of renewable energy plants connected to the power system through static conver... more The growing number of renewable energy plants connected to the power system through static converters have been pushing the development of new strategies to ensure transient stability of these systems. The virtual synchronous generator (VSG) emerged as a way to contribute to the system stabilization by emulating the behavior of traditional synchronous machines in the power converters operation. This paper proposes a modification in the VSG implementation to improve its contribution to the power system transient stability. The proposal is based on the virtualization of the resistive superconducting fault current limiters’ (SFCL) behavior through an adaptive control that performs the VSG armature resistance change in short-circuit situations. A theoretical analysis of the problem is done based on the equal-area criterion, simulation results are obtained using PSCAD, and experimental results are obtained in a Hardware-In-the-Loop (HIL) test bench to corroborate the proposal. Results sh...
IEEE Latin America Transactions
Energies
A setup for testing transformers under load through low power converter is presented in this pape... more A setup for testing transformers under load through low power converter is presented in this paper. This setup is used for testing power transformers as it allows to verify their performance under operating conditions regarding aspects such as heating, voltage regulation, and mounting robustness. The main goal of the study is centered on replacing a full power Back-to-Back converter (1 pu) by a fractional power one (less than 0.1 pu). The converter, a Voltage Source Inverter (VSI), is a series connected between two equally sized transformers and controls the current flowing in the system. Load profile configurations set according to power factor, current harmonics, or even power level can be imposed to evaluate the performance of the Transformer Under Test (TUT) and the entire system. Theoretical analysis, and simulation results employing Matlab/Simulink platform, considering a typical transformer of a 75 kVA power distribution grid with 13.8 kV/220 V voltage are presented to corrob...
This paper presents a single-stage self-oscillating high-power-factor electronic ballast more sui... more This paper presents a single-stage self-oscillating high-power-factor electronic ballast more suitable for both low power levels (because it operates in discontinuous conduction mode) and low ac mains applications (since it employs an input-doubler rectifier). The electronic ballast is based on a high-frequency dither signal, which shapes the input current in a sinusoidal waveform. In order to reduce the electronic ballast components the self-oscillation technique has been employed. An electronic ballast prototype operating at 25 kHz has been implemented to drive two 40-W straight-type fluorescent lamps from a 127-V utility line. High power factor is achieved even though the electronic ballast drives just one fluorescent lamp. The experimental results demonstrated the electronic ballast operation.
Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation, and Automation, 2000
Power Factor Preregulators (PFP) have been used to improve input current waveform of off-line pow... more Power Factor Preregulators (PFP) have been used to improve input current waveform of off-line power supplies. There are two major approaches in implementing control circuits in PFP: the multiplier approach and the voltage-follower approach. The simplest one is the voltage-follower approach because the converter operates in discontinuous conduction mode (DCM), and only one loop control is required. SEPIC and CUK converters present a great advantage over boost and fly-back topologies in DCM: an input current with low harmonic content can be obtained by correctly choosing inductors L, and L, of the converter with a fixed operation frequency, as is demonstrated here. Also some discussion about the intermedium capacitor C, as well some advantages and disadvantages of the aplication is done. Simulation and experimental results support the approach. Therefore, SEPIC and CUK converters in DCM seem to be good choices to use as PFP.-Domingos S. L. Simonetti is a professor at the Departament of Electrical Engineering, Universidade Federal do Espinto Santo, Brazil. Femando S. dos Reis is a professor at the Department of Electronics, Pontificia Universidade Cat6lica do R.G. do Sul, Brazil. Both are perforaling their doctoral course at Universidad Politknica de Madrid with a scholarship from the Brazilian Agency CAPES. naturally fol~ows the sinusoidal line voltage waveform. The voltage-follower approach provides a simple control scheme, requiring Only One Using boost or buck-boost converter as PFP in discontinuous conduction mode requires an input filter, C,, because a large loop'
Electronica Unmsm, 2002
En los últimos años se ha puesto mucha atendón en la mejora de la eficiencia del control de los m... more En los últimos años se ha puesto mucha atendón en la mejora de la eficiencia del control de los motores variando la freeoeneia {Abrahamsen, 1998J, [Abrahamsen, 1996J. En el presente trabajo, uno de los objetivos específicos aplicado a una embarcadón alimentado por energía solar de alta eficiencia. es reducir los costos.
2010 9th Ieee Ias International Conference on Industry Applications Induscon 2010, Nov 1, 2010
Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344), 2002
This paper presents an electronic control gear for HID lamps that operates with a low frequency c... more This paper presents an electronic control gear for HID lamps that operates with a low frequency current inverter to drive the lamp, a DC-DC buck converter to control the current and the power of the lamp and a power factor pre-regulator based on discontinuous conduction mode boost converter. All signals of the power stages are provided by a dedicated microcontroller. An overview of the lamp operation phases and the strategies to avoid acoustic resonance are mentioned. A 70W prototype without acoustic resonance and stroboscope effect was implemented. The approach can be easily extended for other rated power.
This paper presents a high performance dc-dc switching mode power supply designed to deliver a re... more This paper presents a high performance dc-dc switching mode power supply designed to deliver a regulated 0-5OVlO-1OA output. The proposed power supply is based on a modified version of the zero voltage switching full-bridge phase-shift dc-dc converter, which incorporates commutation auxiliary inductors to provide zero voltage switching for the entire load range, as well as a commutation aid circuit to clamp the output diode voltage. The control strategy is based on two control loops operating in cascade mode. The inner loop maintains a regulated output current, whereas the external voltage loop the regulates output voltage, independently of load changes and input voltage variations. To obtain a high reliability converter, the control circuit has been implemented using just two ICs. The phase-shift regulator UC3875 IC generates the gate drive signal to the MOSFETs. The control loop regulators are implemented using the TL074 IC. Theoretical analysis and experimental results have been obtained for a 0-50VlO-lOA power supply operating at 100kHz.
A new approach to improve the input current profile of three-phase rectifiers is presented in thi... more A new approach to improve the input current profile of three-phase rectifiers is presented in this paper. To achieve this aim, an auxiliary circuit is used to impose current circulation during the time intervals that the rectifier does not absorb current. The additional switches are of low current capacity. Design equations are presented, as well as the operating characteristics. Experimental results corroborate the analysis carried out here.
Este artigo apresenta o desenvolvimento e a implementação de um conversor de alta corrente, contr... more Este artigo apresenta o desenvolvimento e a implementação de um conversor de alta corrente, controlado por microcontrolador, baseado no retificador de meia onda hexafásico. Um algoritmo de controle da corrente de carga do conversor foi desenvolvido em linguagem de montagem. O algoritmo implementa um controlador proporcional integral, PI, o qual controla a corrente de saída atuando no comando de disparo de tiristores. Foi construído um protótipo de laboratório de 6kW de potência máxima, com corrente de saída retificada de 300A e tensão média de 20V. Comparações entre resultados experimentais e resultados de simulações apontam que o modelo matemático utilizado foi adequado para a modelagem do conversor.
This paper presents a 0-30V/0-5A microcontroller-based switched-mode power supply. The proposed p... more This paper presents a 0-30V/0-5A microcontroller-based switched-mode power supply. The proposed power supply has two stages. The input stage is a boost converter as a power factor pre-regulator, which provides universal input (127- 220 V, 50/60 Hz) with power factor correction. The output stage is a two transistor forward converter, that allows voltage and current adjust. A single microcontroller is in charge of controlling the two converters, being responsible for keeping the dc bus voltage fixed (boost converter output) and adjusting the output voltage and current (forward converter output). The control loops were implemented using proportional-integral controllers. Furthermore, the microcontroller does the user interface task through potentiometers to select output voltage and current, and a liquid crystal display to show their values.
Este artigo apresenta um circuito regenerativo de ajuda a comutação magneticamente acoplado aplic... more Este artigo apresenta um circuito regenerativo de ajuda a comutação magneticamente acoplado aplicado a um conversor elevador (boost) operando no modo de condução contínua (MCC). Sua principal característica está na utilização de um indutor acoplado ao indutor principal do conversor para transferir a energia armazenada no capacitor do circuito de ajuda a comutação para a carga. Esta transferência de energia se dá de forma ressonante, fazendo com que a tensão sobre o capacitor seja nula ao final de cada período de comutação. Ao longo do artigo são apresentadas equações que descrevem o comportamento do conversor e do circuito de ajuda a comutação, bem como algumas equações de projeto. Ao final, são mostrados resultados experimentais que comprovam o elevado rendimento do conversor boost com o circuito de ajuda à comutação proposto.
Resumo Este artigo apresenta a família de conversores CC-CC PWM empregando a técnica ZVT melhorad... more Resumo Este artigo apresenta a família de conversores CC-CC PWM empregando a técnica ZVT melhorada. O circuito proposto utiliza uma célula magneticamente acoplada a fim de reduzir a perda de comutação durante o bloqueio do interruptor auxiliar. É apresentada uma metodologia de projeto que permite obter de forma rápida e fácil os valores dos elementos de ambas as células, ZVT e de ajuda à comutação do interruptor auxiliar. Também são apresentados resultados de simulação para cada um dos conversores propostos, bem como resultados experimentais obtidos a partir da construção de um protótipo de 500W / 100kHz do conversor boost. Os resultados apresentados demonstram os benefícios alcançados a partir do uso da célula regenerativa proposta. Abstract This paper presents the DC-DC PWM converters family employing the improved ZVT technique. The proposed cir-cuit uses a magnetically coupled cell to reduce the turn-off switching loss of the auxiliary switch. A design procedure is pre-sented, fr...
Duty-cycle modulation of single-switch three-phase boost rectifiers has been demonstrated to be a... more Duty-cycle modulation of single-switch three-phase boost rectifiers has been demonstrated to be an effective way to reduce their input current harmonics. But a converter design methodology for such control approach is not available yet. This paper intends to fulfill this lack, presenting a design approach for this operation mode. Design equations are provided for some operation conditions, and experimental results validate the approach.
This paper presents an electronic control gear for metal halide lamps that operates with a low fr... more This paper presents an electronic control gear for metal halide lamps that operates with a low frequency current inverter to drive the lamp, and a DC-DC buck converter to control the lamp current and the power. All signals of the power stages are provided by a dedicated microcontroller. An overview of the lamp operation phases and the strategies to avoid acoustic resonance are mentioned. A 70W prototype without acoustic resonance and stroboscope effect was implemented. The approach can be easily extended for other rated power and other high intensity discharge lamps.
This paper presents the use of a magnetically coupled regenerative turn-on and turn-off snubber c... more This paper presents the use of a magnetically coupled regenerative turn-on and turn-off snubber configuration aplied WR D 6HSLF DQG ûXN FRQYHUWHUV RSHUDWLQJV LQ FRQWLQXRXV FRQGXFWLRQ PRGH �&0�� 7KH SURSRVHG VQXEEHU XVHV WKH PDLQ FRUH RI the DC-DC converter to build the resonant inductor. In addition to reducing the stresses in the switch, providing soft transitions in its turn-off voltage and turn-on current, it transfers the energy stored in the snubber capacitor to the output (load) or input. An analytical study of the converters is presented. Experimental results are shown for a proposed structure.
Low switching-frequency converters are a good alternative if weight and size are not a restrictio... more Low switching-frequency converters are a good alternative if weight and size are not a restriction. Their main features are reduced EMI emission and low switching losses. This paper performs a comparison among three low-switching frequency three-phase rectifiers. Some new important information are introduced in the paper, such as a dynamical model to design the control loop and components rating. Experimental results complete the exposition.
Uma nova técnica de modulação da razão cíclica aplicada a retificadores trifásicos elevadores com... more Uma nova técnica de modulação da razão cíclica aplicada a retificadores trifásicos elevadores com um interruptor é apresentada neste artigo. A diferença com respeito à solução inicial similar é que a modulação da razão cíclica é feita por multiplicação de sinais, e não por soma. Desta forma, o conteúdo harmônico de baixa freqüência permanece constante independente do valor de carga. Resultados experimentais permitem comparar a solução proposta (modulação por multiplicação) com a original (modulação por soma), e validam a técnica apresentada.