Fault current controller for a direct current power grid

A fault current controller for a direct current power grid, comprising:

• a primary circuit, wherein the primary circuit comprises an inductor, a filter capacitor, a first resistor, a second resistor, a third resistor, an IGBT switch, a first diode, a second diode, a first contactor, a second contactor, and a Hall current sensor;
• wherein the inductor, the first resistor and the second contactor are connected in series to form a series circuit;
• wherein the series circuit and the first contactor are connected in parallel;
• wherein the second resistor and the first diode are connected in series to form a first branch;
• wherein the third resistor and the second diode are connected in series to form a second branch;
• wherein the first branch, the second branch and the inductor are connected in parallel;
• wherein the filter capacitor, the IGBT switch and the first resistor are connected in parallel;
• wherein the Hall current sensor is arranged in the series circuit;
• and
• a controller, which is configured to control the IGBT switch, the first contactor and the second contactor in the primary circuit to form different on-off combinations, enabling different working modes of the primary circuit.