A reactive power control method for wind turbines capable of forced excitation

Abstract

The invention discloses a wind turbine generator set reactive power control method with a force excitation effect, and aims to control a wind turbine generator set which adopts a converter with a force excitation function. The method comprises the following steps: (1) enabling the force excitation function for a main control system of the wind turbine generator set; (2) judging the actual voltage value U of the wind turbine generator set, enabling the force excitation function for the wind turbine generator set, that is, enabling the wind turbine generator set to enter a force excitation mode when U is lower than a low-voltage force excitation operation threshold Ulow or higher than a high-voltage force excitation operation threshold Uhigh, performing lead compensation for force excitation if U is lower than Ulow, performing lag compensation for force excitation if U is higher than Uhigh, and performing compensation according to normal reactive power support when U is between Ulow and a 90% rated voltage of a wind turbine generator set system or between Uhigh and a 110% rated voltage of a wind turbine generator set system. Through adoption of the method, the voltage adaptability of the wind turbine generator set can be enhanced, so that the wind turbine generator set can operate within a wider voltage range, and a stronger support effect on a power grid can be achieved when a system voltage fault occurs; therefore, the method is particularly applicable to a double-fed wind turbine generator set.

Description

technical field [0001] The invention relates to the field of wind power control, in particular to a reactive power control method of a wind turbine capable of strong excitation. Background technique [0002] At present, the capacity of the converters for wind turbines is generally less than or equal to the capacity of the wind turbines, or slightly higher than the required capacity of the wind turbines. However, the capacity of converters used in double-fed wind turbines is generally smaller than the total capacity of the wind turbines. When the double-fed wind turbines are running, if the reactive power compensation function is to be realized, it is mainly to rely on the converters to control the generators for reactive power compensation and grid connection. The reactive power compensation of the grid-side converter; when the wind turbine is not running, the compensation capacity will be determined by the capacity of the grid-side converter itself. [0003] With the integ...

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Problems solved by technology

[0006] It can be seen that the above-mentioned existing wind turbine reactive power control method obviously still has inconvenience and defects, and needs to be further improved urgently.

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