The invention discloses a large power network graded
voltage control method under
wind power access. The control method comprises the steps of (1) measuring the
power flow calculation data at the input current moment of the
system in real time; (2) carrying out online selection on data leading node based on clustering by fast search and find of density peaks; (3) carrying out three-level
voltage control optimization calculation according to the current state, and determining an adjusting target value of the
voltage of the leading node according to the optimization result and the selected leading node; and (4) sending down the leading node target value to a two-level
voltage control system, implementing two-level
voltage control, ensuring the voltage of the leading node at the target value level, and maintaining the overall voltage level of the
system; judging whether the system runs to a moment corresponding to a next three-level
voltage control cycle or not; if so, returning to the step (1); and or otherwise, returning to the step (4). By adoption of the large power network graded voltage control method, it is ensured that the control
machine set, the control target and the constraint conditions do not need to be replaced frequently in the process when the target issued by the three-level voltage control is maintained by the two-level voltage control, so that the feasibility of the practical
engineering application can be ensured.