Reactive Power Control to Minimize Inductor Current for Single Phase Dual Active Bridge DC/DC Converters

A reactive power controller for a single-phase dual active bridge (DAB) DC/DC converter is proposed in this paper. Based on the power flow analysis between the primary and secondary side of the DAB converter, the effect of the active and reactive power is investigated. Then, a reactive power command is generated to regulate the proper reactive power in the converter while controlling a DC output voltage or active power simultaneously. This naturally leads to the minimum inductor current without requiring a complex phase-shift modulation based on the classical mode analysis and extra complicated control functions. The proposed control strategy can be applicable to a wide variety of DAB applications such as electric vehicles, asynchronous micro-grid interconnection, and aerospace applications, etc.