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Method and device for protecting wind generating set during electric network voltage dip in short time

A technology of wind power generators and wind power generators, applied in the field of crowbar circuits, to achieve the effect of reducing costs and less action

Inactive Publication Date: 2012-11-14
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the existing crowbar protection circuit, and to provide a protection method and device for wind turbine generators that can meet the requirements of low voltage ride-through and lower cost to cope with short-term power grid voltage drops

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  • Method and device for protecting wind generating set during electric network voltage dip in short time

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 As shown, it can be seen from the attached drawings that the present invention is a method and device for protecting a wind power generating set against a short-term drop in grid voltage. In the wind power generation system, a low-voltage ride-through crowbar circuit is set, which is characterized in that the low-voltage ride-through crowbar circuit includes at least one set of main thyristors and an auxiliary circuit composed of auxiliary thyristors, capacitors and reactors. The main thyristor Together with the auxiliary circuit, the crowbar circuit is turned on and off. When it needs to be turned on, the main thyristor is triggered to turn on the circuit, and when it needs to be turned off, the auxiliary thyristor is triggered, and the auxiliary capacitor and auxiliary reactor work together to realize the shutdown of the prev...

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Abstract

The invention discloses a method and a device for protecting a wind generating set during electric network voltage dip in a short time. A crowbar circuit with low voltage ride through is set in a wind generating system and comprises at least one set of main thyristors and an auxiliary circuit which consists of an auxiliary thyristor, a capacitor and a reactor; and the main thyristors and the auxiliary circuit realize the switching-on and switching-off of the crowbar circuit together. When the crowbar circuit needs to be switched on, the main thyristors are triggered to enable the circuit to be switched on; and when the crowbar circuit needs to be switched off, the auxiliary thyristor is triggered, and the auxiliary capacitor and the auxiliary reactor work together to realize the switching-off of the main thyristors which are previously switched on. The switching-off loop of the thyristor which consists of the auxiliary thyristor, the auxiliary capacitor and the auxiliary reactor is used; and when the circuit needs to be switched off, the auxiliary thyristor is triggered so as to realize the switching-off of the thyristor which are previously switched on.

Description

technical field [0001] The invention relates to a grid voltage control method and device for a wind power generation system, in particular to a wind power generating set protection method and device for short-term voltage drop of the grid. It is mainly used in the crowbar circuit of low voltage ride through in the wind power generation system. Background technique [0002] In a wind power generation system, such as a doubly-fed wind power generation system, due to fluctuations in the power grid or short-term faults in the power grid, the voltage of the power grid will drop, and the voltage drop will cause the wind turbine to change from the normal working condition to the low-voltage ride-through working condition , with the increasing proportion of wind energy in the power grid, if the low voltage ride through is not properly handled, it will cause large-scale shutdown of wind turbines, cause a huge impact on the power grid, and even cause the grid to collapse. [0003] To...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/10
Inventor 赵燕峰曹国荣郭知彼
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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