Method and arrangement to forecast an output-power of at least one wind-turbine

摘要

The invention relates to a method and an arrangement to forecast an output-power of at least one wind-turbine.According to the invention an optical-signal with a known frequency is sent from an optical transmit-unit (OTU) to a joint measurement volume (CMV). The optical-signal is scattered and reflected by atmospheric particles of the joint measurement volume. As the atmospheric particles are moving with the wind the optical signal is shifted in its frequency due to the Doppler-principle.The scattered and frequency-shifted optical signal is received by an optical receive-unit (ORU). The frequency-shifted optical signal is compared with the sent optical signal to determine the wind-speed, based on the shifted frequency.According to the invention the determined wind-speed is used to predict the output-power of the at least one wind-turbine (WT11) or of a whole wind-farm (WF) in a preferred embodiment.