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

Abstract

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.

Description

technical field [0001] The invention relates to a reactive power voltage control method, in particular to a reactive power voltage control method of a grid-connected point of a wind farm. Background technique [0002] At present, most large-scale wind farms operate in the constant power factor mode, and the reactive power adjustment capability of the wind turbine itself is very limited. The voltage regulation of the grid-connected point of the wind farm can only rely on the reactive power compensation device of the step-up station and the voltage regulation of the on-load voltage regulating transformer. accomplish. The voltage at the grid-connected point of the wind farm has a strong correlation with the level of active output. When the active output of the wind farm increases, the reactive power loss and voltage loss on the wind power feeder and transformer increase. The voltage of the grid-connected point of the wind farm is due to reactive power When the active output of...

AI Technical Summary

Problems solved by technology

[0002] At present, most large-scale wind farms operate in the constant power factor mode, and the reactive power adjustment capability of the wind turbine itself is very limited. The voltage regulation of the grid-connected point of the wind farm can only rely on the reactive power compensation device of the step-up station and the voltage regulation of the on-load voltage regulating transformer. accomplish

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