A High Side Voltage Fluctuation Suppression Control of Bidirectional Chopper to Reduce Capacitance of DC Bus

Recently, battery energy storage for photovoltaic system has been increasingly introduced into homes. These systems generally consist of dc-dc converters and single-phase inverters. Conventionally, smoothing capacitors with relatively large capacitance have been used to suppress the voltage fluctuation of the dc bus due to fluctuations in the ac output power. In this paper, we propose a control method to keep the output voltage constant using means of a bidirectional chopper connected to the battery and to reduce the capacity of the smoothing capacitor. numerical simulation and experimental results verify the control performance.