Design and Analysis of A Simplified Non-isolated Bidirectional DC-DC Converter for Energy Storage Systems

To retain voltage and frequency stability in the power system network, non-conventional energy sources like solar and wind require energy storage systems. Energy storage devices (ESDs) such as batteries and super capacitors require bidirectional DC-DC converters (BDDC) to enable power exchange under the required conditions. In this paper, a novel bidirectional DC-DC converter is proposed which has quadratic voltage gain in both boost and buck operating modes. It has low charging and discharging ripple, continuous input and output current capability, wide conversion range. All these features help the DC bus and storage devices work together more efficiently. The suggested converter is analyzed in step-up and step-down modes and it is simulated in MATLAB/Simulink environment accordance with the converter design. Further, the mathematical analysis in various conditions is explained. Finally, experimental data confirm the performance of the suggested converter.