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A method of suppressing low-frequency oscillation of wind turbine transmission chain

A low-frequency oscillation, wind turbine technology, applied in wind power generation, single-grid parallel feeding arrangement, etc., can solve problems such as coupling slippage, shortening the life of wind turbines, and failure of wind turbines to operate normally, and achieve good frequency adaptability. Effect

Inactive Publication Date: 2018-02-02
CORONA WIND EQUIP BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the damping of the transmission chain is reduced, there will be obvious low-frequency oscillations on the transmission chain, which will cause the coupling to slip and reduce the life of the wind turbine. In severe cases, the wind turbine cannot operate normally

Method used

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  • A method of suppressing low-frequency oscillation of wind turbine transmission chain
  • A method of suppressing low-frequency oscillation of wind turbine transmission chain

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] The topology of wind turbines based on converter grid-connected technology is as follows: figure 1 As shown, the converter uses a voltage sensor to collect the three-phase stator voltage, denoted as u abc ,Such as figure 1 Middle 01; the main control sends the active power command P to the converter through communication ctrl ,Such as figure 1 Middle 02; the converter according to the main control active power command P ctrl Control the active power P that the wind turbines output to the grid grid ,Such as figure 1 Medium 03;

[0020] The low-frequency oscillation suppression method of the wind turbine drive chain based on the converter control of the present invention is as follows: figure 2 Shown:

[0021] Step 1: The converter is based on the measured three-phase stator voltage u abc , the output generator speed ω is calcula...

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Abstract

The invention provides a method for restraining low frequency oscillation of transmission chains of a wind turbine unit. By using a converter in the wind turbine unit, low frequency oscillation of transmission chains can be detected and restrained. The converter detects the low frequency oscillation of the transmission chains according to the difference value between the algebraic sum accumulation deviation Sigma e1 that the instant rotation speed Omega deviates the filtering rotation speed Omega f of a generator in cycle time and the absolute value accumulation deviation Sigma e2. Micro-component of the filtering rotation speed Omega f is multiplied by the proportionality coefficient Kp, so additional damping power Pdamp is generated. The main control given active power Pctrl is overlaid with the additional damping power Pdamp, so the terminal execution active power Pconv of the converter is obtained. When the rotation speed of the transmission chains rises, the additional damping power Pdamp is positive so as to restrain the increasing of the rotation speed. When the rotation speed drops, the additional damping power Pdamp is negative so as to restrain the rotation speed to drop, which means that the equivalent damping of the transmission chains of the wind turbine unit is increased. Thus, the low frequency oscillation of the transmission chains can be restrained.

Description

technical field [0001] The invention relates to a method for suppressing low-frequency oscillation of a transmission chain of a wind turbine by using a converter. Background technique [0002] With the development of wind power machine technology, there are more and more suppliers of wind turbine main components. When products from different manufacturers are installed together to form a system, the parameters of the whole machine will more or less deviate from the original design, which brings a series of problems, among which the typical one is the blade-hub-gearbox-generator Reduced drive chain damping. When the damping of the transmission chain is reduced, there will be obvious low-frequency oscillation on the transmission chain, which will cause the coupling to slip and reduce the life of the wind turbine. In severe cases, the wind turbine cannot operate normally. [0003] In the power system, the low-frequency oscillation phenomenon of the generator drive chain is ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 吕佃顺林资旭李海东徐铮王贵鹏董志然马强武鑫
Owner CORONA WIND EQUIP BEIJING CO LTD
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