Abstract:
A photovoltaic and energy storage system (ESS) needs a bidirectional buck-boost converter, which this paper proposes. For zero-voltage switch turn-ON, conventional bidirectional buck-boost converters for ESSs use discontinuous conduction mode (DCM). DCM operation causes high output voltage and current ripples and low power-conversion efficiency. A cascaded buck-boost converter and auxiliary capacitor improve the performance of the conventional converter.
The proposed converter’s current path reduces output current ripple and boosts efficiency. The converter was tested using a prototype. The converter has a maximum efficiency of 98%, less than 5.14 V p.p output voltage ripple, and less than 7.12 A output current ripple. At 160 V input, 45 kHz switching frequency, 80-320 V output, and 16-160 W output power, these results were obtained. The proposed converter outperforms the conventional converter in experiments.
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