The invention provides a hierarchical coordination
voltage control method and
system for a
hybrid multi-infeed AC / DC
hybrid system. The method comprises the following steps: 1, calculating the track sensitivity of each
bus voltage and the
voltage sensitivity of each control quantity to a direct-current feed-in
bus; 2, judging whether
system-level control and converter
station-level control are started or not; 3, calculating the reactive
power margin of the generator based on the wide-
area measurement data, and determining whether the system-level participation coordination control quantity comprises a converter
station-level control quantity or not; 4, optimizing and solving a corresponding
optimal control sequence of
voltage stability coordination control; 5, judging whether the control quantities in the two-stage
optimal control sequences of the system and the converter
station conflict or not, if yes, selecting the control quantities according to a coordination control rule for application, detecting whether the
load bus voltage meets a preset requirement or not after application, and if yes, exiting coordination control; otherwise, repeating the steps 1-5 until the voltage of the
load bus meets the preset requirement. And the medium-and-long-term
voltage stability of the system can be improved.