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Circuit to be used in a wind power plant

A circuit structure and wind power device technology, applied in wind power generation, wind power motor combination, wind power engine control, etc., can solve problems such as unfavorable circuit devices, impossible network stability, etc.

Inactive Publication Date: 2005-06-08
VESTAS WIND SYST AS
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  • Summary
  • 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. The 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 stator ≈1.8·U network / (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 cu...

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Abstract

The invention relates to a circuit with variable rotational speed, especially for wind power plants, comprising a doubly-fed asynchronous generator (DASM), a crowbar, an additional resistor (R15) and a converter. In order to meet the needs of the network provider so that a dedicated permanent connection to the network is guaranteed so that the wind power plant can be started and stabilized during and after a medium voltage short circuit in the network, additional resistors can be switched on and off quickly The regulation is carried out with the aid of the system in such a way that the converter can be temporarily at least partially disconnected in the event of a short circuit in the network. The rotor current is temporarily taken up by the additional resistor and disconnected after the rotor short-circuit current disappears, so that the converter can then be connected again and be able to supply the desired effective 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 Applications(China)
IPC IPC(8): F03D7/04F03D9/00H02P9/00H02P9/10
CPCH02P9/007H02P9/105Y02E10/72H02H7/06F03D9/255
Inventor 洛伦兹·费德森
Owner VESTAS WIND SYST AS
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