Method and arrangement to determine a wind-speed
AssigneeSiemens Aktiengesellschaft
InventorsIoannis Antoniou, Soeren Markkilde Pedersen
Life of this patent
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Abstract
A method and an arrangement are provided to determine the speed of the wind, which acts on a wind-blade of a wind-turbine. An optical-signal with a known frequency is sent from an optical-transmit-unit to a joint measurement volume. The optical-signal is scattered and reflected by atmospheric particles of the joint measurement volume. The optical signal is shifted in its frequency due to the Doppler-principle, too. The frequency-shifted optical signal is received by a receive-unit. The frequency-shifted optical signal is compared with the sent optical-signal to determine the wind-speed based on the shifted frequency, which is caused by the atmospheric particles.
Claims20
A method for determining a wind-speed of a wind acting on a blade of a wind-turbine, comprising:
- sending an optical-signal with a known frequency from an optical transmit-unit to a joint measurement volume;
- scattering the sent optical-signal and reflecting the sent optical-signal by atmospheric particles of the joint measurement volume;
- shifting the known frequency of the sent optical signal due to a Doppler-principle;
- receiving the frequency-shifted optical signal by an optical receive-unit;
- comparing the frequency-shifted optical-signal with the sent optical-signal;
- determining the wind-speed based on the shifted frequency caused by the atmospheric particles moving with the wind;
- combining the wind-speed with a factor for determining a three-dimensional wind-vector;
- and
- adjusting a setting of the wind-turbine according to the three-dimensional wind-vector.
An arrangement for determining a wind-speed of a wind acting on a blade of a wind-turbine, comprising:
- an optical transmit-unit located on the blade that sends an optical-signal with a known frequency to a joint measurement-volume for scattering and reflecting the sent optical-signal by atmospheric particles of the joint measurement volume to shift the known frequency of the sent optical-signal due to a Doppler-principle;
- an optical receive-unit located on the blade that receives the frequency-shifted optical-signal;
- and
- a determination-unit that compares the frequency-shifted optical-signal with the sent optical-signal and determines the wind-speed based on the shifted-frequency caused by the atmospheric particles moving with the wind,
- wherein the determination-unit is configured to:
- combine the wind-speed with a factor for determining a three-dimensional wind-vector;
- and
- adjust a setting of the wind-turbine according to the three-dimensional wind-vector.
Dependencies are inferred from the claim text.