The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Reuben P. R. Sousa - One of the best experts on this subject based on the ideXlab platform.

  • A Unidirectional Single-Phase AC–DC–AC Three-Level Three-Leg Converter
    IEEE Transactions on Industry Applications, 2019
    Co-Authors: Reuben P. R. Sousa, Nustenil S. M. L. Marinus, Cursino Brandão Jacobina, Nady Rocha
    Abstract:

    A unidirectional ac–dc–ac three-level three-leg converter is proposed in this paper. This converter is composed of a unidirectional neutral-point-clamped (NPC) leg and two bidirectional NPC legs. A bidirectional NPC leg is shared between rectifier and inverter sides. Compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same dc-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, pulsewidth modulation, and control strategies of the system are presented. Also, a method for balancing dc-link capacitor Voltages is shown. As the converter is unidirectional, the grid current and the Generated Voltage at the load side must be synchronized with the Generated Voltage at the grid side, which eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • Unidirectional single-phase AC-DC-AC three-level and two-level three-leg converters
    2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    Four unidirectional AC-DC-AC three-level and two-level three-leg converters are proposed in this paper. This converters are composed of an unidirectional rectifier and a bidirectional inverter, using three-level and two-level legs and an unidirectional NPC leg at rectifier side. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the systems are presented. As the converters are unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • An unidirectional single-phase AC-DC-AC three-level three-leg converter
    2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    An unidirectional AC-DC-AC three-level three-leg converter is proposed in this paper. This converter is composed of an unidirectional rectifier and a bidirectional inverter, using two bidirectional NPC legs and an unidirectional NPC leg. A bidirectional NPC leg is shared between rectifier and inverter. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the system are presented. As the converter is unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

Nustenil S. M. L. Marinus - One of the best experts on this subject based on the ideXlab platform.

  • A Unidirectional Single-Phase AC–DC–AC Three-Level Three-Leg Converter
    IEEE Transactions on Industry Applications, 2019
    Co-Authors: Reuben P. R. Sousa, Nustenil S. M. L. Marinus, Cursino Brandão Jacobina, Nady Rocha
    Abstract:

    A unidirectional ac–dc–ac three-level three-leg converter is proposed in this paper. This converter is composed of a unidirectional neutral-point-clamped (NPC) leg and two bidirectional NPC legs. A bidirectional NPC leg is shared between rectifier and inverter sides. Compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same dc-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, pulsewidth modulation, and control strategies of the system are presented. Also, a method for balancing dc-link capacitor Voltages is shown. As the converter is unidirectional, the grid current and the Generated Voltage at the load side must be synchronized with the Generated Voltage at the grid side, which eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • Unidirectional single-phase AC-DC-AC three-level and two-level three-leg converters
    2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    Four unidirectional AC-DC-AC three-level and two-level three-leg converters are proposed in this paper. This converters are composed of an unidirectional rectifier and a bidirectional inverter, using three-level and two-level legs and an unidirectional NPC leg at rectifier side. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the systems are presented. As the converters are unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • An unidirectional single-phase AC-DC-AC three-level three-leg converter
    2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    An unidirectional AC-DC-AC three-level three-leg converter is proposed in this paper. This converter is composed of an unidirectional rectifier and a bidirectional inverter, using two bidirectional NPC legs and an unidirectional NPC leg. A bidirectional NPC leg is shared between rectifier and inverter. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the system are presented. As the converter is unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • IECON - Parallel AC-DC single-phase asymmetrical boost rectifiers
    IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, R. M. B Cavalcanti
    Abstract:

    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.

Nady Rocha - One of the best experts on this subject based on the ideXlab platform.

  • A Unidirectional Single-Phase AC–DC–AC Three-Level Three-Leg Converter
    IEEE Transactions on Industry Applications, 2019
    Co-Authors: Reuben P. R. Sousa, Nustenil S. M. L. Marinus, Cursino Brandão Jacobina, Nady Rocha
    Abstract:

    A unidirectional ac–dc–ac three-level three-leg converter is proposed in this paper. This converter is composed of a unidirectional neutral-point-clamped (NPC) leg and two bidirectional NPC legs. A bidirectional NPC leg is shared between rectifier and inverter sides. Compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same dc-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, pulsewidth modulation, and control strategies of the system are presented. Also, a method for balancing dc-link capacitor Voltages is shown. As the converter is unidirectional, the grid current and the Generated Voltage at the load side must be synchronized with the Generated Voltage at the grid side, which eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • Unidirectional single-phase AC-DC-AC three-level and two-level three-leg converters
    2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    Four unidirectional AC-DC-AC three-level and two-level three-leg converters are proposed in this paper. This converters are composed of an unidirectional rectifier and a bidirectional inverter, using three-level and two-level legs and an unidirectional NPC leg at rectifier side. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the systems are presented. As the converters are unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • An unidirectional single-phase AC-DC-AC three-level three-leg converter
    2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    An unidirectional AC-DC-AC three-level three-leg converter is proposed in this paper. This converter is composed of an unidirectional rectifier and a bidirectional inverter, using two bidirectional NPC legs and an unidirectional NPC leg. A bidirectional NPC leg is shared between rectifier and inverter. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the system are presented. As the converter is unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • IECON - Parallel AC-DC single-phase asymmetrical boost rectifiers
    IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, R. M. B Cavalcanti
    Abstract:

    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.

Cursino Brandão Jacobina - One of the best experts on this subject based on the ideXlab platform.

  • A Unidirectional Single-Phase AC–DC–AC Three-Level Three-Leg Converter
    IEEE Transactions on Industry Applications, 2019
    Co-Authors: Reuben P. R. Sousa, Nustenil S. M. L. Marinus, Cursino Brandão Jacobina, Nady Rocha
    Abstract:

    A unidirectional ac–dc–ac three-level three-leg converter is proposed in this paper. This converter is composed of a unidirectional neutral-point-clamped (NPC) leg and two bidirectional NPC legs. A bidirectional NPC leg is shared between rectifier and inverter sides. Compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same dc-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, pulsewidth modulation, and control strategies of the system are presented. Also, a method for balancing dc-link capacitor Voltages is shown. As the converter is unidirectional, the grid current and the Generated Voltage at the load side must be synchronized with the Generated Voltage at the grid side, which eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • Unidirectional single-phase AC-DC-AC three-level and two-level three-leg converters
    2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    Four unidirectional AC-DC-AC three-level and two-level three-leg converters are proposed in this paper. This converters are composed of an unidirectional rectifier and a bidirectional inverter, using three-level and two-level legs and an unidirectional NPC leg at rectifier side. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the systems are presented. As the converters are unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • An unidirectional single-phase AC-DC-AC three-level three-leg converter
    2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, Reuben P. R. Sousa
    Abstract:

    An unidirectional AC-DC-AC three-level three-leg converter is proposed in this paper. This converter is composed of an unidirectional rectifier and a bidirectional inverter, using two bidirectional NPC legs and an unidirectional NPC leg. A bidirectional NPC leg is shared between rectifier and inverter. When compared with the two-level leg, the three-level leg presents Voltage stress reduction on switches for the same DC-link Voltage level and also allows a reduction in harmonic distortion for the same switching frequency. Suitable modeling, PWM and control strategies of the system are presented. As the converter is unidirectional, the grid current and the Generated Voltage at load side must be synchronized with Generated Voltage at grid side. That eliminates the zero-crossover distortion in the grid current caused by the use of diodes without the hysteresis control. Simulation and experimental results are also presented.

  • IECON - Parallel AC-DC single-phase asymmetrical boost rectifiers
    IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
    Co-Authors: Nustenil S. M. L. Marinus, Nady Rocha, Cursino Brandão Jacobina, R. M. B Cavalcanti
    Abstract:

    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.

Seung-bok Choi - One of the best experts on this subject based on the ideXlab platform.

  • A new piezoelectric energy harvester using two beams with tapered cavity for high power and wide broadband
    International Journal of Mechanical Sciences, 2018
    Co-Authors: Usharani Ramalingam, Uma Gandhi, Umapathy Mangalanathan, Seung-bok Choi
    Abstract:

    Abstract Designing a wideband vibration based piezoelectric energy harvester is a challenging problem and is currently being investigated by many researchers. In this work, a new piezoelectric energy harvester is proposed to enhance broadband frequency using two beam structures which have variable cross section and tapered cavity. The wider operating frequency range is achieved by bringing the second mode frequency closer to the first mode maintaining the mass ratio between bigger beam and smaller beam. In addition, the enhancement in the magnitude of the Generated output Voltage is achieved by introducing the tapered cavity. Therefore, the proposed harvester provides enhanced output Voltage and power in first mode as well as second mode of the resonance frequency. In order to accomplish this target, the harvester is analytically modeled using Euler Bernoulli beam theory with Bessel functions and the effectiveness is experimentally demonstrated. It is shown the magnitude of the Generated Voltage is increased as the cavity thickness increases. It is also validated that the Generated Voltage and harvested power from the analytical model agree well with the measured results in wide frequency.

  • Design of high output broadband piezoelectric energy harvester
    Journal of Mechanical Science and Technology, 2017
    Co-Authors: R. Usharani, G. Uma, M. Umapathy, Seung-bok Choi
    Abstract:

    Designing a wideband vibration based piezoelectric energy harvester is a challenging problem. This paper presents a technique to increase the operating frequency range and to enhance the amplitude of the Generated Voltage. The harvester is designed with a propped cantilever beam with variable overhang having step sections. The harvester is modeled using Euler Bernoulli beam theory. The wider operating frequency range is achieved by varying the overhang length and the enhancement in the magnitude of the Generated Voltage is achieved by introducing step sections in the beam. Further the magnitude of the Generated Voltage is found to increase with the reduction in step thickness. The performance of the energy harvester like bandwidth, Voltage Generated and power harvested obtained from analytical model are in close agreement with experimental results.