Abstract: In view of the shortage of traditional energy supply and the insufficient consumption of renewable energy in China, in order to ensure the high utilization rate of renewable energy and restrain the system power fluctuation caused by the intermittent renewable energy, it is of great research significance and practical value to study the operation and optimization of AC/DC hybrid microgrid. The AC/DC hybrid microgrid being connected to the grid through the power electronic transformer（PET）, and considering the penetration rate of different interruptible loads, this paper establishes a mix integer linear programming（MILP）model to realize the system operation optimization under the different exchange power.