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Method for monitoring the load on rotor blades of wind energy installations

A technology for wind power generation devices and rotor blades, which is applied in the direction of wind power generator components, wind engine control, wind engine monitoring, etc., and can solve problems such as rotor blade material aging

Active Publication Date: 2009-06-17
WEIDMULLER MONITORING SYST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage here is that the damaging event is treated as a single event, and the deterioration of the rotor blade material due to frequently occurring events that are not important in themselves is only taken into account if this event leads to damage

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  • Method for monitoring the load on rotor blades of wind energy installations
  • Method for monitoring the load on rotor blades of wind energy installations
  • Method for monitoring the load on rotor blades of wind energy installations

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Embodiment Construction

[0030] figure 1 An overall view of a wind turbine with three rotor blades 1 fastened to a hub 2 is shown. The hub 2 in turn transitions into a horizontally mounted shaft. The shaft terminates in a nacelle 3 , which includes mechanical technical devices not further shown, and which is arranged rotatably about a vertical axis on the upper end of the tower 4 .

[0031] according to figure 2 , in the shown embodiment, on the inner surface of the wide free aerodynamic shell 6 of the rotor blade 1, in the lower third of the rotor blade 1 facing the rotor blade base 16, two and one The dimensional acceleration sensors 5 are fixedly installed on the aerodynamic shell 6 of the rotor blade 1 , and the acceleration sensors 5 have different acceleration directions from each other. In this embodiment, one acceleration sensor 5 is oriented in X to measure bending oscillations running parallel to the upper surface of the aerodynamic shell 6, and one acceleration sensor 5 is oriented in Z...

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Abstract

The invention, which relates to a method for monitoring the load on rotor blades of wind energy installations by means of acceleration measurements on at least one rotor blade of a wind energy installation and the determination of the load on the rotor blade from the picked-up acceleration signals, is based on the object of specifying a method with which dynamic, even uncritical load states can be detected, in differentiated fashion, and combined in a suitable form for evaluation in order to influence, if possible prior to the onset of damage to the rotor blade, the mode of operation of the wind energy installation, in particular the design of the pitch control or angle setting of stall-regulated rotor blades, on the basis both of all of the rotor blades together and of a single rotor blade. This problem is solved by the frequency of the occurrence of the load values over a certain period of time being determined from the amplitudes of the time signal or the amplitudes of selected natural oscillations of the frequency spectra obtained by Fourier transformation.

Description

technical field [0001] The invention relates to a method for monitoring the load on a rotor blade of a wind power plant by means of an accelerometer on at least one rotor blade during operation of a wind power plant and for evaluating the rotor from the acquired acceleration signal pair An estimated magnitude of the load on the blade is determined. Background technique [0002] The rotor blades are among the most stressed components of wind power plants. In order for wind power plants to operate economically, the rotor blades must withstand extreme centrifugal forces, drafts and storms, turbulence, solar radiation, extreme temperature differences and icing conditions over many years of continuous operation. [0003] The rotor blades are therefore also among the components with the highest failure rate. The repair of rotor blades and the replacement of rotor blades in most cases today can be very costly and result in a great deal of lost revenue time. For this reason, earl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCF05B2270/807G01M5/0033G01M5/0066Y02E10/723F05B2270/334F03D7/0264Y02E10/721Y02E10/722F03D7/0224F05B2270/331F03D11/0091F03D17/00Y02E10/72
Inventor 彼得·沃尔克默
Owner WEIDMULLER MONITORING SYST GMBH