Group control charger system and control method

The invention belongs to the field of direct current charger control, and particularly relates to a group control charger system and a control method. According to the invention, the charging module group comprising a plurality of power groups and the bridging contactor for connecting each power group in the charging module group with the direct current bus corresponding to the charging module group are arranged, and the charging controller is used for distinguishing the charging host computer and the borrowed power slave computer corresponding to the same charging module group; the bridging contactors of the host power group and the slave available power group are controlled to be closed, so that the host can output by borrowing the slave power, the power does not need to be distributed through calculation, and the control process can be simplified; when the power is borrowed, the bridging contactors of the power group corresponding to the host and the power groups in the available state corresponding to all