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Low voltage ride through control method and device for a double-fed wind power generation system

A double-fed wind power generation and low-voltage ride-through technology, which is applied in wind power generation and single-network parallel feeding arrangements, can solve the problems of fixed capacity, difficult hardware, and difficult expansion, so as to prevent secondary overcurrent and ride-through Strong ability and good recovery effect

Inactive Publication Date: 2012-04-11
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO +1
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AI Technical Summary

Problems solved by technology

[0004] At present, the crowbar protection circuit used in low voltage ride through has the following defects: (1) the small capacity cannot adapt to the large-capacity doubly-fed wind power generation system, and the hardware implementation is difficult; (2) it is not easy to expand, and it cannot (3) The capacity is fixed, and different models need to redesign different crowbar circuits

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  • Low voltage ride through control method and device for a double-fed wind power generation system
  • Low voltage ride through control method and device for a double-fed wind power generation system
  • Low voltage ride through control method and device for a double-fed wind power generation system

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing.

[0020] Such as figure 1 , figure 2 and image 3 As shown, a doubly-fed wind power generation system low-voltage ride-through control method and device, the drop detection part detects grid voltage signal, rotor current, and DC bus voltage signal, which is transmitted to the drop judgment part, that is, the converter controller 9 for judgment, and the drop The detection part detects the grid voltage signal, the rotor current signal, and the DC bus voltage signal, which are transmitted to the drop judgment part, namely the converter controller 9 for judgment. When the low voltage ride-through condition is met, the converter controller 9 stops the generator side Converter 3 pulses, triggering IGBT1 to cut into Crowbar at the same time, IGBT1 in Crowbar is turned on, and the high-power absorbing resistor quickly releases the transient impact current in the rotor winding 4 of...

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Abstract

The invention discloses a low voltage ride through control method and device for a double-fed wind power generation system, which are suitable for the field of high-power wind power generation. The low voltage ride through control method is realized by a fall detection part, a fall judgment part and a triggering operation part; the low voltage ride through control device comprises a bidirectional converter, a converter controller and an active crowbar module. The invention has the advantages that: the control on low voltage rid through is realized by a crowbar circuit, thus preventing the secondary overcurrent effectively, and facilitating the recovery of a power grid; and the low voltage ride through device in the invention has strong rid through capacity and good effect.

Description

technical field [0001] The invention relates to a low-voltage ride-through control method and device for a double-fed wind power generation system, which are suitable for high-power wind power generation. field. Background technique [0002] With the increase of grid-connected wind turbines, their interaction with the grid is becoming more and more significant. When the grid voltage fails and drops, if it is not controlled, it will cause damage to the wind turbines and converters and generate a power impact on the grid, and the wind turbines will also be disconnected, which will lead to transient instability of the power system , may cause partial or even complete system paralysis, endanger other equipment on the grid and even cause user losses. Therefore, the State Grid requires that the grid-connected wind power generation equipment must have the grid fault ride-through capability, that is, when the grid failure or disturbance causes the voltage drop at the grid-connecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/763Y02E10/76
Inventor 谭国俊叶宗彬凌臧
Owner CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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