Electrical power system

A method of operating an electrical power system comprising a DC voltage source, a DC electrical network, and a DC to AC to DC converter comprising a transformer;

• a primary side comprising a plurality of first transistors and a first inductor connected between the DC voltage source and a primary winding of the transformer, the first inductor being connected in series with the primary winding;
• and a secondary side comprising a plurality of second transistors and a second inductor connected between the DC electrical network and a secondary winding of the transformer, the second inductor being connected in series with the secondary winding;
• the method comprising:
• monitoring an electrical current or voltage between the DC voltage source and the DC electrical network;
• determining, based on the monitored electrical current or voltage, whether the DC electrical network is in a fault condition;
• increasing a switching frequency of the primary side of the DC to AC to DC converter in response to a positive determination that the DC electrical network is in a fault condition.

A controller for controlling a DC to AC to DC converter in an electrical power system that includes a DC voltage source;

• a DC electrical network;
• and a DC to AC to DC converter comprising:
• a transformer;
• a primary side comprising a plurality of first transistors and a first inductor connected between the DC voltage source and a primary winding of the transformer, the first inductor being connected in series with the primary winding;
• and a secondary side comprising a plurality of second transistors and a second inductor connected between the DC electrical network and a secondary winding of the transformer, the second inductor being connected in series with the secondary winding, wherein the controller is configured to:
• monitor an electrical current or voltage between the DC voltage source and the DC electrical network of the electrical power system;
• determine, based on the monitored electrical current or voltage, whether the DC electrical network is in a fault condition;
• and
• increase a switching frequency of the primary side of the DC to AC to DC converter in response to a positive determination that the DC electrical network is in a fault condition.