According to the operating characteristics of distribution network in the islanded mode

an autonomous operation control strategy applied to the islanded mode is proposed for the power electronic transformer(PET)applied to the AC/DC distribution network. By establishing a globalized multi-port transmission model

the operation status of each port is unified and the energy exchange of each port is coordinated to give full play to the energy exchange and support of each port

and achieve the autonomous operation of PET. The simulation system of AC/DC distribution network with PET is built and the effectiveness of the control strategy is verified.