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Method for stabilising a rotor of a wind turbine

A rotor and thrust technology, applied in the control of wind turbines, wind turbines, motors, etc., can solve problems such as short-term power loss

Pending Publication Date: 2021-08-24
VESTAS WIND SYST AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A blackout can be a short-term or long-term loss of power in a specific area of ​​the grid

Method used

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  • Method for stabilising a rotor of a wind turbine
  • Method for stabilising a rotor of a wind turbine

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Embodiment Construction

[0036] In general, the present invention relates to a method for stabilizing a rotor of a wind turbine for a period of time after an abnormal grid event. As previously stated, the present invention provides a method and a control system that ensure that wind turbines remain connected to the grid during abnormal grid events and that prevent, or at least reduce, the wind turbines associated with such abnormal grid events. The rotor oscillates.

[0037] figure 1 Examples of allowable rotor thrust 102 and associated blade pitch angle 103 are shown as a function of time before, during and after an abnormal grid. As mentioned earlier, abnormal grid events usually involve significant changes in grid operating conditions (eg, LVE).

[0038]As mentioned above, TSO can define LVE differently. Thus, for example, LVE may occur when the grid voltage is at or below eg 90% of the rated grid voltage. Other thresholds (eg 85%, 80% of nominal grid voltage) may also be applied.

[0039] exi...

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PUM

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Abstract

The present invention relates to a method for stabilizing a rotor of a wind turbine during a time period following an abnormal grid event, the method comprising the steps of detecting an occurrence of the abnormal grid event, reducing an allowable rotor thrust from a first thrust limit to a second thrust limit, detecting that the abnormal grid event has ended, and maintaining the second thrust limit a selected time period after the abnormal grid event has ended. The present invention further relates to a wind turbine controller and a computer program product for performing this method.

Description

technical field [0001] The invention relates to a method for stabilizing a rotor of a wind turbine in relation to abnormal grid events. In particular, the invention relates to a method for preventing or at least reducing rotor oscillations of a wind turbine related to abnormal grid events. Background technique [0002] It is well known that maintaining the connection of wind farms to the grid is important when the grid is subject to abnormal grid events. [0003] Many generator designs use current flowing through the windings to create a magnetic field on which the generator operates. Such a generator may have a threshold voltage below which the generator either fails to function properly or operates at reduced efficiency. Some generators will even disconnect themselves from the grid when the grid voltage falls below this threshold. This effect is more pronounced in a doubly-fed induction generator (DFIG) with two sets of electrodynamic magnetic windings (one fixed and on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/06F03D7/02
CPCH02P9/06F03D7/0284F03D7/0224H02P2101/15F05B2270/337Y02E10/72F05B2270/1031F05B2270/1075
Inventor A·D·瑟洛
Owner VESTAS WIND SYST AS