Abstract:
DC-DC converters are frequently used in electric vehicles, energy storage systems, and DC mi crogrids to convert a DC voltage from one level to another. Bidirectional DC-DC converters
are converters that allow power to flow in both forward and backward directions. Bidirectional
converter with high gain voltage is essential for energy conversion applications such as vehicles,
medical devices, smart lighting’s etc. This work proposes a high gain multi-input bidirectional
DC-DC converter for the interface between an energy storage system and a DC micro-grid,
which is important for DC-DC topologies. An Interleaved Bidirectional Converter (IBC) is
located in the Low Volatge Side (LVS) to reduce the ripple in input current as well as output
voltage. A voltage doubler is located in the High Voltage Side (HVS) to achieve high gain
voltage conversion ratio. A simple and cost effective PWM plus Phase Shift (PPS) control is
used in this work. As a modification to the existing bidirectional DC-DC converter for charging
stations, PV panel is introduced as one of the input sources to create a cost-effective charg ing system, makes the proposed converter as a multi-input DC-DC converter. Zero-oscillation
Maximum Power Point Tracking (MPPT) algorithm is used to extract maximum power from
solar PV panels. Based on the available irradiation level, the control topology selects either a
PV panel or a DC source as the input. To verify the effectiveness of the proposed converter
and control topology, 800 W, 240V MI-IBC with switching frequency 30 KHz is designed and
simulated in this work.
