Low voltage traversing control method for wind power generation set grid-connection current transformer

A technology for wind turbines and low-voltage ride-through, applied in wind power generation, adjusting electrical variables, control/regulation systems, etc., can solve problems such as reducing system efficiency, hardware costs, increasing volume and weight, and increasing the number of components, etc., to achieve The effect of simplifying the system structure, improving the efficiency of the unit, and reducing the volume of the device

Inactive Publication Date: 2009-08-05
BEIJING NEGO AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology is simple and reliable, on the one hand, it reduces the system efficiency, and at the same time,

Method used

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  • Low voltage traversing control method for wind power generation set grid-connection current transformer
  • Low voltage traversing control method for wind power generation set grid-connection current transformer
  • Low voltage traversing control method for wind power generation set grid-connection current transformer

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Experimental program
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Effect test

Embodiment 1

[0028] According to the low voltage ride-through control method of the grid-connected converter of the wind power generating set in the present invention, when the grid voltage drops, the input power of the grid-connected converter has no time to change, and the grid-connected power decreases with the decrease of the grid voltage, and the grid-connected converter The residual energy generated by the unbalanced input and output power of the converter is accumulated on the intermediate DC link capacitor, causing the intermediate DC voltage to rise.

[0029] (1) The motor-side converter detects the rise of the intermediate DC voltage, and obtains the feedback value of the intermediate DC voltage. Compared with the command value of the intermediate DC voltage, the difference is input to the voltage regulator, and the voltage regulator controls the intermediate DC voltage to follow the intermediate DC voltage command. value.

[0030] (2) The voltage regulator output wind turbine to...

Embodiment 2

[0040] According to the low voltage ride-through control method of the grid-connected converter of the wind power generator set in the present invention, the grid-connected converter implements reactive power to the grid according to the reactive power command value given by the grid scheduling during the grid voltage drop. Compensation to help the grid voltage return to normal faster,

[0041] When the grid voltage drops, the input power of the grid-connected converter has no time to change, and the grid-connected power decreases with the decrease of the grid voltage. The input and output power of the grid-connected converter is unbalanced and the residual energy is accumulated on the intermediate DC link capacitor, resulting in The intermediate DC voltage rises.

[0042] (1) The motor-side converter detects the rise of the intermediate DC voltage, and obtains the feedback value of the intermediate DC voltage. Compared with the command value of the intermediate DC voltage, th...

Embodiment 3

[0055] According to the low voltage ride-through control method of the grid-connected converter of the wind power generator set in the present invention, the grid-connected converter implements reactive power to the grid according to the reactive power command value given by the grid scheduling during the grid voltage drop. Compensation to help the grid voltage return to normal faster.

[0056] When the grid voltage drops, the input power of the grid-connected converter has no time to change, and the grid-connected power decreases with the decrease of the grid voltage. The input and output power of the grid-connected converter is unbalanced and the remaining energy is accumulated on the inductance of the intermediate DC link, resulting in Intermediate DC current rises.

[0057] (1) The motor-side converter detects the rise of the intermediate DC current, obtains the feedback value of the intermediate DC current, compares it with the command value of the intermediate DC current...

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PUM

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Abstract

The invention provides a method for controlling low-voltage ride-through of the grid-connected converter of a wind-driven generating set. On the basis of back-to-back voltage or current-typed grid-connected converter, a motor-side converter detects the middle direct current voltage; a voltage adjuster controls the middle direct current voltage to follow with the middle direct current voltage instruction value; a torque adjuster controls the practical torque to follow with the torque instruction value; an active power adjuster controls the grid-side converter and leads the grid-connected active power to follow with the active power instruction value. The transfer of the dump energy is realized by the coordinated control of the motor-side converter and the grid-side converter, elements such as additional resistance and the like are not required so as to consume the rest energy, thus ensuring that the wind-driven generating set does not run without the grids during the falling period of the network voltage at the access point. The method improves the efficiency of the unit, reduces the energy loss, simplifies the structure of the system, reduces the volume of the device, reinforces the compactness of the structure and reduces the cost of the device.

Description

technical field [0001] The invention relates to a grid connection method of a wind power generating set, in particular to a low voltage ride through control method of a wind power generating set grid connection converter. Background technique [0002] With the continuous increase of the installed capacity of wind turbines, the position of wind power in the power system has changed. When the installed capacity of wind power is small, the impact of wind farm operation on system stability can be ignored; when the installed capacity of wind power becomes larger and the proportion of the system increases year by year, the impact of wind farm operation on system stability become inescapable. Power systems around the world have increasingly strict requirements for wind farms to be connected to the grid. Grid companies in various countries have successively put forward stricter technical requirements for the grid connection of wind farms / wind turbines, including low voltage ride-th...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18G05F1/70
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 姜久春唐挺陈瑶
Owner BEIJING NEGO AUTOMATION TECH
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