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

A doubly-fed wind power generation and wind power generator technology, applied in the direction of motor generator control, electronic commutation motor control, control of generators, etc.

Inactive Publication Date: 2012-01-25
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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 pr

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

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with specific embodiments.

[0041] The basic hardware topology of a doubly-fed wind turbine is as follows: figure 1 As shown, the grid supplies power to the rotor of the doubly-fed wind turbine through the converter, and the generator is driven by the wind turbine, and its stator outputs active and reactive power to the grid. There are many known methods for measuring generator parameters, and the most commonly used method is to use no-load and locked-rotor tests to measure motor parameters. Using the method in Document 1, the parameters of the generator can also be obtained, such as the stator resistance R s , stator winding inductance Ls, stator and rotor winding mutual inductance L M and other parameters.

[0042] Document 1: "Estimation and Measurement of Asynchronous Motor Parameters in Vector Control System", Ma Xiaoliang, Electric Drive, Volume 40, Issue 7, 2010.

[0043] The gene...

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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...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 杨柳刘嫣红毛志怀
Owner CHINA AGRI UNIV
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