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Control method for restraining harmonic current of doubly-fed wind generator stator side

A doubly-fed wind power generation and wind generator technology, applied in the direction of motor generator control, generator control, electronic commutation motor control, etc., can solve the problems of increasing initial equipment investment and operation and maintenance costs, and achieve economic cost savings, Targeted, easy-to-operate effects

Inactive Publication Date: 2015-09-02
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used harmonic control methods in the power grid mainly include passive filtering and active filtering. Due to the use of harmonic control devices, the initial investment and operation and maintenance costs of equipment need to be increased

Method used

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  • Control method for restraining harmonic current of doubly-fed wind generator stator side
  • Control method for restraining harmonic current of doubly-fed wind generator stator side
  • Control method for restraining harmonic current of doubly-fed wind generator stator side

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Embodiment Construction

[0024] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, a control method for suppressing harmonic currents on the stator side of a doubly-fed wind generator (DFIG), which is used for independent decoupling control of the machine-side converter and the grid-side converter of the doubly-fed wind generator, the method Including, constructing the doubly-fed wind generator mathematical model under the n-th harmonic rotating coordinate system, and obtaining the voltage control compensation item under the n-th harmonic rotor dq coordinate system; The expression of the wind turbine mathematical model is:

[0026] Ψ s d q n n = ...

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Abstract

The invention provides a control method for restraining harmonic current of a doubly-fed wind generator stator side. The method comprises the steps that a doubly-fed wind generator mathematical model under an nth-degree harmonic rotating coordinate system is established, and a voltage control compensation item under an nth-degree harmonic rotor dq coordinate system is obtained; the decision variable of the fifth-degree harmonic current control link and the decision variable of the seventh-degree harmonic current control link are introduced into vector control of a doubly-fed wind generator side converter, and reference instructions of the fifth-degree harmonic and the seventh-degree harmonic of a doubly-fed wind generator stator and the voltage component and the rotor modulation voltage under the dq coordinate system are obtained; PWM control signals of the doubly-fed wind generator side converter are generated through modulation. The control target of restraining the stator harmonic current is achieved, and the effect of the harmonic current on a wind generator is reduced.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for suppressing harmonic current on the stator side of a doubly-fed wind power generator. Background technique [0002] Wind power is a renewable energy with huge reserves. In recent years, the installed capacity of wind power in my country has developed rapidly, and the installed capacity of wind power has jumped to the first place in the world. Due to the randomness of wind energy, the actual situation of the wind farm access point must be fully considered during the construction process of the wind farm and when it is put into grid operation, that is, wind power resources, loads, and the grid need to be considered in general to meet The basic balance relationship of the electrical quantity of the grid realizes the coordinated and stable operation of the wind farm and the power system. The power quality of the grid-connected point of the wind farm is of great significance t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P9/00H02P101/15
Inventor 马世英葛俊张军宋墩文张爽杨学涛高峰张海顺田蓓熊选文位士全冯静
Owner CHINA ELECTRIC POWER RES INST
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