High voltage direct current power transmission series valve group control device

A high voltage direct current power transmission series valve group control device, configured to regulate a high voltage direct current power transmission device having two or more valve groups that are connected in series and controllable power semiconductors respectively, wherein

• each valve group is provided with a current regulation unit and a voltage regulation unit, the current regulation unit is configured to control a direct current flowing through a valve group corresponding to the current regulation unit, and the voltage regulation unit is configured to control a voltage across two ends of a valve group corresponding to the voltage regulation unit;
• one valve group is selected from the series valve group as a master control valve group, and the others are taken as slave control valve groups;
• the master control valve group selects a trigger angle output by the current regulation unit to control same, the master control valve group is controlled by trigger angle which is output by the current regulation unit, the slave control valve group is controlled by trigger angle which is output from a subtractor, wherein the output value of the subtractor is obtained by subtracting an output value of the voltage regulation unit from the trigger angle transmitted from the master control valve group.