Hybrid AC/DC distribution networks are promising candidates for future applications due to their rapid advancement in power electronics technology. They use interface converters (IFCs) to link DC and AC distribution networks. However

the networks possess drawbacks with AC voltage and frequency offsets when transferring from grid-tied to islanding modes. To address these problems

this paper proposes a simple but effective strategy based on the reverse droop method. Initially

the power balance equation of the distribution system is derived

which reveals that the cause of voltage and frequency offsets is the mismatch between the IFC output power and the rated load power. Then

the reverse droop control is introduced into the IFC controller. By using a voltage-active power/frequency-reactive power (<tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$U-P/f-Q$) reverse droop loop

the IFC output power enables adaptive tracking of the rated load power. Therefore

the AC voltage offset and frequency offset are suppressed during the transfer process of operational modes. In addition

the universal parameter design method is discussed based on the stability limitations of the control system and the voltage quality requirements of AC critical loads. Finally

simulation and experimental results clearly validate the proposed control strategy and parameter design method.