Running control method for wind generating set with gear box speed regulation front end

Abstract

The invention provides a running control method for a wind generating set with a gear box speed regulation front end. The method comprises a set grid connection starting control strategy, a maximum wind energy tracking control strategy below a rated rotation speed point, a rated rotation speed point variable power and constant power control strategy and a grid fault control strategy. The speed ofa differential speed regulation mechanism of a variable speed gear box is regulated by controlling the rotation speed of a speed regulation motor through a frequency converter; flexible grid connection of the set is realized at the grid connection starting stage; maximum wind energy capture control of the set is realized in a region below the rated rotation speed point; variable power control andconstant power control of the set are realized in a rated rotation speed point running region; and low voltage ride-through control of the set is realized and a synchronous generator supports a powergrid through a strong excitation function to restore the voltage when the power grid fails. By various control methods, the set meets the running requirements of a speed variable type wind generatingset, safe, stable and high-efficiency running of grid connection of the set is realized, and the problem of low voltage ride-through of the set is effectively solved.

Description

technical field [0001] The invention relates to equipment and operation control of a wind power generator set, in particular to an operation control method of a wind power generator set with a speed regulating front end of a variable speed ratio gear box. Background technique [0002] With the continuous expansion of the installed capacity of grid-connected wind turbines and the scale of grid-connected wind farms, the proportion of wind power in the grid is getting higher and higher. In order to achieve reliable grid connection of large-scale wind farms to make full use of wind energy and maintain the stability of the power system, the power systems of various countries in the world have stricter requirements on the connection of wind farms to the grid. Technical standards such as low-voltage ride-through of the unit require that when the grid voltage at the grid-connected point of the wind farm drops, the unit can still maintain grid-connected operation, and can provide a c...

AI Technical Summary

Problems solved by technology

[0005] Therefore, in order to solve the problem of the low voltage ride-through capability of the wind power generating set when the power grid fails, the purpose of the present invention is to provide a wind power generating set operation control method with a variable speed ratio gear box speed regulating front end, which meets the requirements of the variable speed wind power generating set. To meet the operation requirements, realize the reliable operation of wind turbines, and improve the stability of grid-connected operation

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