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 control sensitivity; 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 method for controlling active power of a doubly-fed wind power generator connected to a power grid. Background technique [0002] Today, when energy consumption is increasing and environmental pollution is becoming more and more serious, wind energy as a renewable green energy source is generally valued by all countries in the world. Wind power technology has also become a hot spot for scholars from various countries in recent years. Wind energy is a random energy with frequent changes. Variable-speed constant-frequency wind power technology can ensure that the wind energy at most wind speeds can be captured and utilized to the maximum extent, and has advantages that traditional constant-speed and constant-frequency wind power technology cannot match. , And the doubly-fed wind generator can well meet the technical requirements of variable-speed constant-frequency wind power generation, whic...

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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