Method for controlling active power of double-fed wind power generator

Abstract

The invention discloses a method for controlling the active power of a double-fed wind power generator. The double-fed wind power generator has a double-fed motor, wherein the double-fed motor has a stator and a driving rotor; the stator supplies power to a power grid; the power grid has a voltage with a rated value; the driving rotor is coupled with the stator; one end of the driving rotor is connected to a wind turbine through a speed-changing gear; rotor windings are three-phase coiling type rotor windings; the power grid supplies power to the driving rotor through a converter; and by decomposing a stator voltage and a rotor flux linkage on a synchronously rotary dq coordinate axis, the active power which is output by the stator of the generator can be controlled by regulating a rotor current. The method has the advantages that: the complicated conversion and calculation of vector rotation change and the like are not required; a current control module is relatively lower in controlsensitivity; current control is less influenced by circuit parameters of a converter system and measurement delay; a control technology is simple; the cost of a controller is reduced; and the method is applicable to a low-power wind power generator.

Description

technical field [0001] The invention relates to a wind power generator, in particular to a control method for active power of a doubly-fed wind power generator connected to a grid. Background technique [0002] Today, with increasing energy consumption and increasingly serious environmental pollution, wind energy, as a renewable green energy, has received widespread attention from all over the world, and wind power generation technology has also become a hot research topic among scholars from various countries in recent years. Wind energy is a random energy that changes frequently. The variable-speed constant-frequency wind power generation technology can ensure that the wind energy can be captured and utilized to the maximum at most wind speeds, and has incomparable advantages over the traditional constant-speed constant-frequency wind power generation technology. , and the doubly-fed wind turbine can well meet the technical requirements of variable-speed constant-frequency...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the existing doubly-fed wind generator active power control method, and to provide a doubly-fed wind generator active power control method that does not require complex transformations and calculations such as vector rotation changes

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