Method and device for controlling flexible direct current converter based on self-synchronizing voltage

The invention relates to a control method and device of a flexible direct current converter based on self-synchronizing voltage, and belongs to the field of flexible direct current converter control. Comprising the following steps: obtaining a self-synchronizing voltage phase angle according to the direct-current voltage or the grid-side active power of a converter; a self-synchronizing voltage amplitude is obtained through the alternating voltage of the converter or the grid-side reactive power; obtaining a three-phase self-synchronizing voltage according to the self-synchronizing voltage phase angle and amplitude; three-phase virtual impedance is obtained through the three-phase self-synchronizing voltage, the three-phase valve side current and the three-phase valve side voltage; obtaining a three-phase virtual voltage difference according to the three-phase actual current and the maximum allowable current difference value of the converter and the three-phase virtual impedance; and after three-phase self-sy