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Circuit to be used in a wind power plant

一种电路结构、风力装置的技术，应用在风力电机组合、风力发动机的控制、风能发电等方向，能够解决电路装置不利、不可能网络稳定性等问题，达到节省组件、降低损失、花费低的效果

Inactive Publication Date: 2007-12-19
VESTAS WIND SYST AS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these circuit arrangements have been found to be disadvantageous when using doubly-fed asynchronous generators (DASM), which are disconnected from the network in the event of a network short-circuit at the medium voltage level
This means that it is not possible to obtain the desired network stability with wind power installations operated by doubly-fed asynchronous machines

Method used

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  • Circuit to be used in a wind power plant
  • Circuit to be used in a wind power plant
  • Circuit to be used in a wind power plant

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Embodiment Construction

[0026] Fig. 1 shows a circuit configuration according to the present invention. During normal operation, a switch V15, eg an insulated gate bipolar transistor (IGBT), GTO, integrated gate commutated thyristor (IGCT), is switched off and the crowbar is completely ineffective. The entire rotor current flows into a converter and is regulated there. If a network short circuit occurs at medium voltage, full excitation of an asynchronous generator means that it will supply a balanced short circuit current to said short circuit. This current is limited only by the leakage inductance of the asynchronous generator and the medium voltage transformer, and the maximum current reaches the following values:

[0027] I 定子 ≈1.8·U 网络 / (Xtr+X1+X2′)

[0028] In this case, Xtr is the total leakage impedance of the transformer, X1 is the leakage impedance of the stator, and X2' is the leakage impedance of the rotor. In the case of a medium voltage short circuit, the maximum leakage current ca...

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Abstract

The invention relates to a circuit with a variable rotational speed to be used particularly in a wind power plant, comprising a double fed asynchronous generator (DASM), a crow-bar, an additional resistor (R15) and a converter. In order to meet the requirements of the network provider, whereby a particularly permanent coupling to the network should be ensured so that the wind power plant can start up and stabilize the network during and after medium voltage short circuit in the network, the additional resistor can be regulated with the aid of a fast switch in such a way that the converter can be provisionally disconnected at least partly in case of a short circuit in the network. The rotor current is momentarily assumed by the additional resistor and disconnected after the rotor short circuit current dies out so that the converter can be subsequently connected once again and so that it can supply the desired active short circuit current to the network.

Description

technical field [0001] The invention relates to a circuit arrangement, in particular for use in a variable rotational speed wind power installation comprising a doubly-fed asynchronous generator, an additional resistor and a converter. Background technique [0002] Circuit configurations such as these intended for use in wind power installations with variable rotational speeds are widely used in practice and are therefore prior art due to a clear prior use. However, these circuit arrangements have been found to be disadvantageous when using doubly-fed asynchronous generators (DASMs), which would be disconnected from the network in the event of a network short-circuit at the medium voltage level. This means that it is not possible to obtain the desired network stability with wind power installations operated by doubly-fed asynchronous machines. [0003] In the past, the necessary network stability was achieved by network operators through traditional power stations. Due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/10F03D7/04F03D9/00H02P9/00
CPCH02P9/105Y02E10/72F03D9/003H02P9/007H02H7/06F03D9/255
Inventor 洛伦兹·费德森
Owner VESTAS WIND SYST AS
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