A new phase shedding and phase adding control scheme for interleaved DAB converter operating in IPOP configuration

This paper focuses on Voltage Fed Dual Active Bridge (VF-DAB) bidirectional DC-DC converter modules connected Input Parallel and Output Parallel (IPOP) configuration. Modularity or parallel operation of the bidirectional DC-DC converters for energy storage application is not just an economic solution for increasing the power transfer capability, but also provides several advantages such as redundancy, reduced design cost and hot swap feature of faulty module. In this paper, an interleaved VF-DAB with phase-shedding operation at light loads are proposed for interfacing energy storage devices to a common DC bus. A modification in the conventional active current sharing technique for parallel operated converters is proposed to implement phase shedding and phase adding operation. A 12 kW interleaved IPOP based DAB converter is proposed and simulated to validate the claims.