Abstract: In AC/DC hybrid microgrid, the instantaneous power ripple of a bidirectional interface converter caused by AC voltage imbalance and the DC voltage double frequency ripple caused by a single-phase AC load merging into DC network, increase the loss of the bi-directional interface converter and affect the stable operation of the AC/DC hybrid microgrid. In view of the above problems, a mathematical model of the bidirectional interface converter in an α-β coordinate system is established, and the double frequency power transmission characteristics of the AC and the DC sub network single-phase inverter loads under the unbalanced conditions are analyzed. On this basis, the unified control strategy of the AC unbalanced voltage and the DC double frequency ripple voltage based on the improved bidirectional interface converter is designed in detail. The capacity of the compensation circuit is analyzed quantitatively, so that the bidirectional interface converter can compensate the AC unbalanced voltage and the DC double frequency pulsation voltage at the same time with its own power margin under the condition of a small DC bus capacitance. The simulation results show that the proposed control strategy is effective and feasible.