Single-phase earth fault ride-through method, system and device for low-voltage transformer area

The embodiment of the invention discloses a single-phase earth fault ride-through method for a low-voltage transformer area, and the method comprises the following steps: determining a single-phase earth fault phase K after detecting that a single-phase earth fault occurs in a first transformer area or a second transformer area; obtaining a K-phase current IK0 of the first transformer area or the second transformer area before the single-phase earth fault occurs and a K-phase current IK1 of the first transformer area or the second transformer area after the single-phase earth fault occurs; determining a K-phase earth fault current Isc of the first transformer area or the second transformer area; presetting rated current Iinv in the first interconnection module or the second interconnection module corresponding to the first transformer area or the second transformer area with the single-phase earth fault; determining a control mode of a first interconnection module or a second interconnection module correspond