Arrangement to measure the deflection of a blade of a wind turbine

Abstract

According to the arrangement invented the deflection of a blade of a wind turbine is determined. A transmitter is arranged close to the tip end of the blade, while a receiver is arranged close to the root end of the blade. The transmitter and the receiver are prepared for a wireless transfer of a monitoring signal, which is sent from the transmitter to the receiver. A monitoring system is arranged close to the root end of the blade. The monitoring system is prepared to generate the monitoring signal. The monitoring system is connected with the transmitter by a cable-bound communication line, thus the monitoring signal is transferred from the monitoring system to the transmitter. The monitoring system is even connected with the receiver, thus the monitoring signal is transferred from the receiver to the monitoring system. The monitoring system is prepared to determine the deflection of the blade based on the transferred monitoring signal.

Description

technical field

[0001] The invention relates to a device for measuring the deflection of a blade of a wind turbine. Background technique

[0002] The blades of modern wind turbines exhibit lengths of 45 meters or more. The blade is optimized for its weight, for its aerodynamic properties and for the best possible generation of electrical power based on the properties of the blade.

[0003] Therefore, sooner or later this optimization will lead to rather flexible and long blades. Due to the flexibility of the blades, the problem arises that the tips of the rotating blades of a wind turbine in operation may hit the tower.

[0004] The distance between the tower and the blade tip is also referred to as "blade tip / tower clearance".

[0005] It is known to measure the deflection of a rotating blade by monitoring the tip of the blade.

[0006] One possibility is to attach strain gauges on the blade surface. It is mainly used for testing purposes to gather some knowledge about...

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