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Evaluation of DC-link decoupling using electrolytic or polypropylene film capacitors in three-phase grid-connected photovoltaic inverters
Karanayil, Baburaj; Agelidis, Vassilios; Pou Félix, Josep
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. TIEG - Grup d'Electrònica Industrial Terrassa
The life expectancy and long term reliability of grid-connected three-phase photovoltaic (PV) inverters can be increased by replacing the conventional electrolytic film capacitors by metallized polypropylene film capacitors. This paper presents a detailed evaluation of a three-phase grid-connected PV inverter performance when replacing the electrolytic capacitor with a minimum value of metallized polypropylene film capacitor-one. The minimum dc bus capacitance leads to larger voltage ripples. However, such ripples were found to be within acceptable limits to run the inverter satisfactorily. Simulation results are presented for a 15-kW grid-connected inverter at nominal voltage of 700V dc and experimental results are provided for a 3.0-kW system at a nominal voltage of 400V dc, built in the laboratory.
Peer Reviewed
Àrees temàtiques de la UPC::Energies::Energia solar fotovoltaica
Àrees temàtiques de la UPC::Enginyeria electrònica
Solar energy
Photovoltaic systems
grid-connected inverters
electrolytic capacitor
Condensadors elèctrics
Energia solar fotovoltaica
Institute of Electrical and Electronics Engineers (IEEE)

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