An individual phase current control strategy for the single-stage medium-frequency isolated PET

In order to ensure high-quality electrical energy output and alleviate the impression of electronic equipment when faults occur on the grid side, this paper applies the individual phase currert control strategy to the single-stage medium-frequency isolated power electronic transformer (PET) and verifies the feasibility and effectiveness of this control strategy. The PET in this paper uses a single-stage medium-frequency transformer to convert voltage and achieve electric isolation, replacing the traditional high-frequency transformer which can omit the convention control method of the isolation link, as well as run efficiently and flexibly. Firstly, the PET principle and advantages are introduced. Secondly, the control method of the individual phase current is described. Finally, the feasibility of the control strategy is verified through the simulation experiment under different power grid fault conditions.