Method for initial charging of DC/DC converter station with input series output parallel structure

A method for initial charging of a DC/DC converter station with an input series-output parallel structure, the method comprising:

• applying auxiliary power supply to a secondary-side conversion unit of a DC converter within the DC/DC converter station and charging a secondary-side capacitor within the secondary-side conversion unit;
• sensing a charge amount of voltage of the secondary-side capacitor;
• charging a primary-side capacitor within a primary-side conversion unit of the DC converter through a transformer within the DC converter based on a result of sensing the charge amount of the voltage of the secondary-side capacitor;
• sensing a charge amount of voltage of the primary-side capacitor;
• and
• applying a grid voltage to the DC/DC converter station based on a result of sensing the charge amount of the voltage of the primary-side capacitor,
• wherein the applying the grid voltage is configured such that the grid voltage is applied only when a magnitude of the voltage of the primary-side capacitor is equal to a value obtained by dividing the grid voltage by a number of DC converters within the DC/DC converter station.