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Device and method for traversing grid fault by double-fed wind power converter

A technology for doubly-fed wind power and power grid faults, which is applied in the field of crowbar Crowbar circuits and wind turbine protection devices, can solve problems such as easily damaged full-control power electronic devices, improve reliability and service life, and prevent off-grid. , the effect of increasing the grid connection time

Inactive Publication Date: 2013-01-30
DALIAN SHINERGY SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the crowbar turns from on to off, due to the existence of the motor inductance, the input terminal of the crowbar produces a high-voltage spike, which is easy to damage the fully-controlled power electronic device.

Method used

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  • Device and method for traversing grid fault by double-fed wind power converter
  • Device and method for traversing grid fault by double-fed wind power converter
  • Device and method for traversing grid fault by double-fed wind power converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as image 3 As shown, the switch circuit 201 is composed of two fully-controlled power electronic devices connected in series.

[0041] Such as Figure 4 As shown, the switch circuit 201 is composed of more than two fully-controlled power electronic devices connected in series.

[0042] When the voltage drop of the power grid 50 causes the rotor current of the doubly-fed converter generator 60 or the DC bus voltage to rise to be equal to or greater than the set Crowbar circuit 10 conduction threshold, the control circuit 20 shuts down the generator-side converter 40 and Trigger the Crowbar circuit 10 so that the series fully controlled power electronic devices in the switch circuit 201 in the Crowbar circuit 10 are simultaneously turned on; when the rotor current of the doubly-fed converter generator 60 decays to be equal to or less than the set 10 When the shutdown threshold value and the voltage of the power grid 50 return to a normal state, the control circuit...

Embodiment 2

[0044] Such as Figure 5 As shown, the switch circuit 201 is composed of two parallel circuit modules 202 connected in series, and each parallel circuit module 202 is composed of multiple fully-controlled power electronic devices connected in parallel.

[0045] Such as Image 6 As shown, the switch circuit 201 is composed of more than two parallel circuit modules 202 connected in series, and each parallel circuit module 202 is composed of multiple fully-controlled power electronic devices connected in parallel.

[0046] When the voltage drop of the power grid 50 causes the rotor current of the doubly-fed converter generator 60 or the DC bus voltage to rise to be equal to or greater than the set Crowbar circuit 10 conduction threshold, the control circuit 20 shuts down the generator-side converter 40 and Trigger the Crowbar circuit 10, so that the fully-controlled power electronic devices in all parallel circuit modules 202 in the switch circuit 201 in the Crowbar circuit 10 a...

Embodiment 3

[0048] Such as Figure 7 As shown, the switch circuit 201 is composed of more than two series circuit modules 203 connected in parallel, and each series circuit module 203 is composed of multiple fully-controlled power electronic devices connected in series.

[0049] When the voltage drop of the power grid 50 causes the rotor current of the doubly-fed converter generator 60 or the DC bus voltage to rise to be equal to or greater than the set Crowbar circuit 10 conduction threshold, the control circuit 20 shuts down the generator-side converter 40 and Trigger the Crowbar circuit 10, so that the fully-controlled power electronic devices in all series circuit modules 203 in the switch circuit 201 in the Crowbar circuit 10 are turned on simultaneously; when the rotor current of the double-fed converter generator 60 decays to equal to or When the shut-off threshold value of the Crowbar circuit 10 is less than the set value and the voltage of the power grid 50 returns to a normal sta...

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Abstract

The invention discloses a device and a method for traversing a grid fault by a double-fed wind power converter. The device comprises a control circuit and a Crowbar circuit; the Crowbar circuit comprises a rectifying circuit, an energy-consuming circuit, a switching circuit and a drive circuit; the input end of the rectifying circuit is connected with a rotor end of a generator; the output end of the rectifying circuit has two interfaces; one interface is connected with the switching circuit through the energy-consuming circuit; the other interface is directly connected with the switching circuit; and the switching circuit at least comprises two full-control power electronic devices which are connected in series. By adopting the circuit, the full-control power electronic devices are effectively protected by reducing the withstand voltage loaded by a single full-control power electronic device; the offline of a machine unit caused by the burnout of the Crowbar circuit because of an over-voltage is prevented; the working reliability of the Crowbar circuit is improved and the service life of the Crowbar circuit is prolonged; the grid-connecting time of a wind-driven generator is increased; and the stability of the power grid is ensured.

Description

technical field [0001] The invention relates to a device and a method for a doubly-fed wind power converter to ride through a power grid fault, in particular to a device and a method for protecting a wind power generating set against a short-term voltage drop of the power grid. It is mainly used in crowbar crowbar circuit for low voltage ride through in wind power generation system. Background technique [0002] Today, when the world advocates green energy, wind power, as a renewable new energy source, has developed rapidly, and the proportion of wind power in grid power supply continues to increase. During operation, grid faults may cause voltage drops, which will cause short-term overvoltage, overcurrent, or speed increase of wind power generation equipment, causing a large number of wind turbines to go off-grid and deteriorating the stability of the power system. Therefore, the quality of grid-connected wind turbines and the stability of their operating conditions are cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 孔庆刚韩向明吴志敢
Owner DALIAN SHINERGY SCI & TECH DEV
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