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Modeling and control of a single-phase grid-tied medium-frequency isolated converter for active and reactive power management in photovoltaic applications

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  • Viera-Díaz, Rosa Iris
  • González-García, Mario
  • Álvarez-Salas, Ricardo
  • Miranda, Homero
  • León-Ruiz, Yuniel
  • Cárdenas, Víctor

Abstract

A single-phase photovoltaic converter formed by the full-bridge dc–dc converter with a capacitive output filter and a grid-tied full-bridge inverter is studied in this paper. The switched model, the average model based on a modified-conventional approach, and the linear state-space model of the dc stage operating in discontinuous conduction mode are presented and compared with the behavior of the state variables obtained from a simulator. A duty-ratio constraint is obtained from the modified average model, which is eliminated by expressing its dependency on the control and the state variables. In addition, the modeling of the ac stage is carried out in the dq reference frame. Linear controllers are designed to guarantee the maximum power point tracking, the regulation of the dc-link voltage, the injection of the active power generated, and the reactive power management as an ancillary function. The controllers proposed, according to the transfer functions derived from the linear models, are validated via simulation for a 1.41 kVA converter.

Suggested Citation

  • Viera-Díaz, Rosa Iris & González-García, Mario & Álvarez-Salas, Ricardo & Miranda, Homero & León-Ruiz, Yuniel & Cárdenas, Víctor, 2024. "Modeling and control of a single-phase grid-tied medium-frequency isolated converter for active and reactive power management in photovoltaic applications," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 223(C), pages 380-393.
    • Handle: RePEc:eee:matcom:v:223:y:2024:i:c:p:380-393
    DOI: 10.1016/j.matcom.2024.04.011
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    References listed on IDEAS

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    1. González, Mario & Cárdenas, Víctor & Miranda, Homero & Álvarez-Salas, Ricardo, 2019. "Modular multilevel converter for large-scale photovoltaic generation with reactive power flow and unbalanced active power extraction capabilities," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 162(C), pages 135-154.
    2. Başoğlu, Mustafa Engin & Çakır, Bekir, 2016. "Comparisons of MPPT performances of isolated and non-isolated DC–DC converters by using a new approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 60(C), pages 1100-1113.
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