The working principle of the dual active bridge DC/DC converter is analyzed, and the equivalent circuit models of DC/DC converter are studied when pole-to-pole fault and pole-to-ground fault occur in the high-voltage side. When the system has pole-to-pole fault on the high-voltage side of the DC/DC converter, the transient characteristics of electric quantities are studied. When the system has pole-to-ground fault on the high-voltage side of the DC/DC converter, the transient characteristics of the electrical quantities are studied in the case of converter blocks immediately and does not block, respectively. The simulation model is built using PSCAD/EMTDC to verify the theoretical analysis results.

dual active bridge DC/DC converter,pole-to-pole fault,pole-to-ground fault,fault characteristics