Assessment of the AC/DC converters resilience to DC grids fault by electrothermal modelling

In Low Voltage Direct Current (LVDC) grids DC short circuits can generate very high currents and huge stress for electronic power converters. Assessing their withstanding capabilities is critical. The present paper proposes to couple a thermal and electrical model of an AC/DC converter. This method allows to solve coordination issues between protection selection and converter sizing, as well as ensuring a reliable protection whatever the distance the fault occurs.