Analysis and control of a single-phase single-stage grid-connected photovoltaic inverter

• Autores: Carlos Meza Benavides
• Directores de la Tesis: Domingo Biel (dir. tes.)
• Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2008
• Idioma: español
• Tribunal Calificador de la Tesis: Fossas Colet Dr. E. (presid.), Robert Griñó Cubero (secret.), M.a. Scherpen Jacquelien (voc.), Francesc Guinjoan (voc.), Nicola Femia (voc.)
• Materias:
  • Ciencias tecnológicas
    • Tecnología electrónica
    • Tecnología de la instrumentación
      • Ingeniería de control
    • Tecnología energética
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• Resumen

  • Photovoltaic (PV) energy generation provides several advantages such as being harmless to the environment and renewable. Furthermore, grid-connected PV energy generation represents a renewable energy growing alternative that is becoming more competitive due to the new favourable governmental laws and policies as recently introduced. In this regard, PV systems that supply power directly to the grid are becoming more popular because of the cost reduction due to the lack of a battery subsystem. The main components of a grid-connected PV (GPV) system include a series-parallel connection arrangement of the available PV panels and a power conditioning system in charge to extract and properly transfer the maximum available power present at the PV generator to the grid. A GPV system based on a single central inverter is one of the most prevailing configurations since, under uniform irradiance conditions of the PV panels, it represents a good trade-off between the extracted energy and the design complexity of the power inverter. In this configuration all of the available PV panels are connected to a single power stage. One of the most typical central inverter power converter topology is the single-phase single-stage full-bridge inverter.

    The control strategy driving the central inverter results crucial for the optimization of the grid-connected PV energy extraction. The inverter's control scheme requires achieving simultaneously the following objectives: - The maximum power extraction from the PV array by means of tracking the solar panels maximum power point that varies with the solar irradiance and the PV panels temperature.

    - The proper conversion of the DC input power into an AC output current which has to be injected to the grid. This current has to exhibit low harmonic contents and must be in phase with respect to the grid voltage in order to perform the power transfer at unity power factor.

    These control requirements have generally been carried out by means of a s