Step-Up Partial Power DC-DC Converters for Two-Stage PV Systems with Interleaved Current Performance

• Main Authors: Jaime Wladimir Zapata, Samir Kouro, Gonzalo Carrasco, Hugues Renaudineau
• Format: Article
• Language: English
• Published: MDPI AG 2018-02-01
• Series: Energies
• Subjects: DC-DC converters; microinverter; string inverter; partial power converters; photovoltaic energy
• Online Access: http://www.mdpi.com/1996-1073/11/2/357

This work presents a partial power converter allowing us to obtain, with a single DC-DC converter, the same feature as the classical interleaved operation of two converters. More precisely, the proposed topology performs similarly as the input-parallel output-series (IPOS) configuration reducing the current ripple at the input of the system and dividing the individual converters power rating, compared to a single converter. The proposed topology consists of a partial DC-DC converter processing only a fraction of the total power, thus allowing high efficiency. Experimental results are provided to validate the proposed converter topology with a Flyback-based 100 W test bench with a transformer turns ratio n 1 = n 2 . Experimental results show high performances reducing the input current ripple around 30 % , further increasing the conversion efficiency.