Method and arrangement for detecting a blade pitch angle unbalance of a rotor blade system of a wind turbine
OwnerIb Frydendal, Johnny Rieperinventors
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Abstract
A method is provided for detecting a blade pitch angle unbalance of a rotor blade system of a wind turbine, the rotor blade system rotating around a rotor rotation axis. The method includes yawing the rotor rotation axis about a yawing axis transverse to the rotor rotation axis. The method also includes obtaining a load signal indicative of a load due to the yawing. The method further includes analyzing the load signal regarding a frequency component of the load signal, and detecting the blade pitch angle unbalance based on the analyzed load signal.
Claims20
A method for detecting a blade pitch angle unbalance of a rotor blade system of a wind turbine, the rotor blade system rotating around a rotor rotation axis, the method comprising:
- yawing the rotor rotation axis about a yawing axis transverse to the rotor rotation axis,
- obtaining a load signal indicative of a load due to the yawing,
- analyzing the load signal regarding a frequency component of the load signal, and
- detecting the blade pitch angle unbalance based on the analyzed load signal.
A method for reducing a blade pitch angle unbalance of a rotor blade system of a wind turbine, the rotor blade system rotating around a rotor rotation axis, the method comprising:
- detecting the blade pitch angle, the blade pitch angle detection comprising
- yawing the rotor rotation axis about a yawing axis transverse to the rotor rotation axis,
- obtaining a load signal indicative of a load due to the yawing,
- analyzing the load signal regarding a frequency component of the load signal,
- detecting the blade pitch angle unbalance based on the analyzed load signal, and
- changing a blade pitch angle of at least one rotor blade comprised in the rotor blade system based on the detected blade pitch angle unbalance in order to reduce the detected blade pitch angle unbalance.
An arrangement for detecting a blade pitch angle unbalance of a rotor blade system of a wind turbine, the rotor blade system rotating around a rotor rotation axis, the arrangement comprising:
- an input terminal that obtains a load signal indicative of a load due to yawing the rotor rotation axis about a yawing axis transverse to the rotor rotation axis, and
- a processor that analyzes the load signal regarding a frequency component of the load signal, and detects the blade pitch angle unbalance based on the analyzed load signal.
Dependencies are inferred from the claim text.