Method of controlling reactive voltage at grid connection point of wind power plant

The invention relates to a method of controlling a reactive voltage at a grid connection point of a wind power plant; the method is adopted to adjust the reactive voltage at the grid connection point of the wind power plant and comprises the following steps: (1) measuring a rated voltage UN at the grid connection point of the wind power plant, setting a voltage control and setting range of the grid connection point of the wind power plant to be 1.0-1.06 UN and controlling a setting value to be 1.04UN; (2) predicting the output of the wind power plant according to a real-time voltage U at the grid connection point of the wind power plant; (3) primarily controlling the reactive voltage at the grid connection point of the wind power plant by means of a capacitor switching-on/switching off manner according to the real-time voltage U and the predicted output of the wind power plant, and meanwhile, utilizing SVG (Scalable Vector Graphics) to perform precise control. Compared with the prior art, the method has the advantages of being good in control effect, advanced in technology and low in cost and the like.