The Experts below are selected from a list of 20061 Experts worldwide ranked by ideXlab platform

Tareq Salameh - One of the best experts on this subject based on the ideXlab platform.

  • robust feedback linearizing control with sliding mode compensation for a grid connected Photovoltaic inverter system under unbalanced grid voltages
    IEEE Journal of Photovoltaics, 2017
    Co-Authors: Adel Merabet, Labib Labib, Amer M Y M Ghias, Chaouki Ghenai, Tareq Salameh
    Abstract:

    A robust feedback linearizing control strategy, based on sliding mode compensation, is proposed for the operation of a grid-connected Photovoltaic inverter system under grid faults, characterized by unbalanced voltages, to meet low-voltage ride through requirements. Under normal grid condition, the control system is developed for maximum power transfer from the Photovoltaic Source to the grid by maximum power point tracking operation of the dc–dc converter, and regulation of the dc-link voltage and the current at the inverter-grid side. Under grid fault, which is unbalanced grid voltage due to voltage dips, the active power is regulated to reduce the current excess and the reactive power is injected to avoid the inverter damage or disconnection, while the dc-link voltage is controlled via the dc–dc converter. A sliding mode compensator is injected into the control system to enhance its robustness to uncertainties. The feedback linearizing control schemes are developed from the grid model at the inverter side and the dc-link model at the dc–dc converter side. The proposed control strategies are experimentally validated on a three-phase grid-connected Photovoltaic inverter system and experimental results show that the control system is effective in terms of voltage and power control with smooth transitions between the modes.

Mehmet Canalp Kulahli - One of the best experts on this subject based on the ideXlab platform.

  • Solar Photovoltaic Source based magnetic launcher simulation design with thermal requirements consideration
    Renewable Energy, 2020
    Co-Authors: S. Ozkucuk, Mehmet Canalp Kulahli
    Abstract:

    Abstract Solar Photovoltaic Source based military defense systems, especially magnetic launchers, have significant advantages in terms of Source independence, mobility, and efficiency. In this study, a solar Photovoltaic Sourced magnetic launcher system is modeled, and a critical component of the system’s (launcher coil) thermal requirements are analyzed. The designed system contains four energy conversion steps that are respectively photon, electrical, magnetic, and mechanical energy; also the launcher coil has an energy loss by the form of heat. Solar Photovoltaic Source based magnetic launcher system is Sourced by solar Photovoltaic panels and produced electrical energy is filtered, limited, and stored by an electrical converter. Stabilized electrical energy is converted to the magnetic energy by a coil. This magnetic energy is transferred to the projectile as mechanical energy. The microcontroller in the electrical converter unit controls all processes and manages the switching operations. Designed launcher coil is subject to a high amplitude current and employs simple, low-cost materials as an air core and copper wire. For this reason, the insulation breakdown on the launcher coil due to high temperatures are investigated, and a simple cooling configuration is suggested.

Adel Merabet - One of the best experts on this subject based on the ideXlab platform.

  • robust feedback linearizing control with sliding mode compensation for a grid connected Photovoltaic inverter system under unbalanced grid voltages
    IEEE Journal of Photovoltaics, 2017
    Co-Authors: Adel Merabet, Labib Labib, Amer M Y M Ghias, Chaouki Ghenai, Tareq Salameh
    Abstract:

    A robust feedback linearizing control strategy, based on sliding mode compensation, is proposed for the operation of a grid-connected Photovoltaic inverter system under grid faults, characterized by unbalanced voltages, to meet low-voltage ride through requirements. Under normal grid condition, the control system is developed for maximum power transfer from the Photovoltaic Source to the grid by maximum power point tracking operation of the dc–dc converter, and regulation of the dc-link voltage and the current at the inverter-grid side. Under grid fault, which is unbalanced grid voltage due to voltage dips, the active power is regulated to reduce the current excess and the reactive power is injected to avoid the inverter damage or disconnection, while the dc-link voltage is controlled via the dc–dc converter. A sliding mode compensator is injected into the control system to enhance its robustness to uncertainties. The feedback linearizing control schemes are developed from the grid model at the inverter side and the dc-link model at the dc–dc converter side. The proposed control strategies are experimentally validated on a three-phase grid-connected Photovoltaic inverter system and experimental results show that the control system is effective in terms of voltage and power control with smooth transitions between the modes.

S. Ozkucuk - One of the best experts on this subject based on the ideXlab platform.

  • Solar Photovoltaic Source based magnetic launcher simulation design with thermal requirements consideration
    Renewable Energy, 2020
    Co-Authors: S. Ozkucuk, Mehmet Canalp Kulahli
    Abstract:

    Abstract Solar Photovoltaic Source based military defense systems, especially magnetic launchers, have significant advantages in terms of Source independence, mobility, and efficiency. In this study, a solar Photovoltaic Sourced magnetic launcher system is modeled, and a critical component of the system’s (launcher coil) thermal requirements are analyzed. The designed system contains four energy conversion steps that are respectively photon, electrical, magnetic, and mechanical energy; also the launcher coil has an energy loss by the form of heat. Solar Photovoltaic Source based magnetic launcher system is Sourced by solar Photovoltaic panels and produced electrical energy is filtered, limited, and stored by an electrical converter. Stabilized electrical energy is converted to the magnetic energy by a coil. This magnetic energy is transferred to the projectile as mechanical energy. The microcontroller in the electrical converter unit controls all processes and manages the switching operations. Designed launcher coil is subject to a high amplitude current and employs simple, low-cost materials as an air core and copper wire. For this reason, the insulation breakdown on the launcher coil due to high temperatures are investigated, and a simple cooling configuration is suggested.

Jean-félix Durastanti - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of the energy transfer in a system combining Photovoltaic Source to ultracapacitors
    International Journal of Hydrogen Energy, 2014
    Co-Authors: A. Djellad, Pierre-olivier Logerais, A. Omeiri, Olivier Riou, Jean-félix Durastanti
    Abstract:

    Abstract The optimal energy transfer is investigated for a system combining a Photovoltaic module, a bank of ultracapacitors and a resistive load. Each ultracapacitor element is modeled with an accurate multibranch circuit composed of resistors and nonlinear capacitors which permit to reproduce its non-ideal behavior. The charge/discharge of ultracapacitors fed with the Photovoltaic module into the resistive load is numerically simulated for irradiance of 1000 W m −2 and cell temperature of 25 °C. The energy and the durations of the charge/discharge cycles are sought according to the low and high voltage thresholds of the controller switches. The cycle efficiency is found in the range [86.5%, 93.5%] and the best time ratio cycle is determined. Finally, the voltage thresholds of the controller switch which enable to transfer the maximal energy within an hour are deduced.