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Wind turbine generator set high voltage through auxiliary device adaptive to island system and method thereof

A technology for wind turbines and auxiliary devices, applied in circuit devices, wind power generation, electrical components, etc., can solve problems such as not attracting enough attention

Inactive Publication Date: 2017-09-29
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-voltage ride-through has not attracted enough attention in China at present, and only requires wind turbines to have a certain high-voltage ride-through capability in the anti-accident measures for wind farms.

Method used

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  • Wind turbine generator set high voltage through auxiliary device adaptive to island system and method thereof
  • Wind turbine generator set high voltage through auxiliary device adaptive to island system and method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The invention provides an auxiliary device for realizing high-voltage ride-through of a wind power generator, the structure diagram of which is as follows figure 1 As shown, a high-voltage ride-through auxiliary device is connected in parallel on the fan side of the wind farm, which is composed of a thyristor, a reactor and a controller. The controller monitors the grid-connected point voltage of the wind turbine in real time. When the grid-connected voltage rises to 1.1 to 1.3 times the rated voltage, the reactor group is quickly put into operation according to the required input inductive reactive power, depending on the size of the reactive power. , and switch the input reactor group when the grid-connected point voltage changes, stabilize the grid-connected point voltage, and assist the wind turbine to achieve high-voltage ride-through.

[0037] The controller is composed of input and output interface, digital signal processor and communication module.

[0038] The...

Embodiment 2

[0045] The present invention also provides a method for implementing a high-voltage ride-through auxiliary device for wind turbines adapted to an island system, including:

[0046] The controller monitors the voltage of the grid connection point in real time;

[0047] When the grid-connected point voltage rises to N times the rated voltage, the controller drives the corresponding switcher according to the required inductive reactive power, and puts in the reactor group;

[0048] When the grid-connected point voltage returns to the normal level, the controller drives the corresponding switching device to withdraw the input reactor group.

[0049] The value of N is 1.1-1.3; the normal level is less than 1.1 times the rated voltage. The inductive reactive power required to be invested is the reactance of 0.3 to 0.7 times the capacity of the fan in the wind farm.

[0050]The invention provides a device and method for assisting wind power generators to realize the high voltage ri...

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Abstract

The invention relates to a wind turbine generator set high voltage through auxiliary device adaptive to an island system and a method thereof. The auxiliary device is connected in parallel at the wind turbine generator set side of a wind power plant and comprises a controller, at least two switches and an electric reactor which is correspondingly connected in series with each switch. The controller is used for monitoring the grid-connected point voltage of the wind turbine generator set in real time. When the grid-connected point voltage rises to the voltage threshold, the switch is selected to perform electric reactor switching according to inductive reactive power required to be compensated for the grid-connected point, and the grid-connected point voltage is enabled to recover to the normal voltage range. The wind turbine generator is enabled to maintain grid-connected operation until recovery of the grid-connected point voltage when the grid-connected point voltage of the wind turbine generator rises to be over 1.1-1.3 times of rated voltage.

Description

technical field [0001] The invention relates to a voltage ride-through device and method in the field of power systems, in particular to a high-voltage ride-through auxiliary device and method for wind turbines adapted to island systems. Background technique [0002] In previous large-scale wind turbine off-grid accidents, most of the wind turbines went off-grid due to voltage drop due to grid disturbance. After the grid disturbance disappeared, the voltage rose for a short time, and some wind turbines went off-grid. At present, the low-voltage ride-through capability of wind turbines has been paid more and more attention, and relevant departments have issued corresponding standards; various wind turbine manufacturers, other scientific research institutions, and electrical equipment manufacturers have also adopted corresponding technical measures and equipment. However, high voltage ride through has not attracted enough attention in China at present, and only requires wind t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/18
CPCH02J3/386H02J3/1864H02J3/388Y02E10/76Y02E40/30
Inventor 李文锋李莹李胜男王官宏陶向宇何凤军韩志勇魏巍
Owner CHINA ELECTRIC POWER RES INST
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