Laser radar device, wind power generator, and wind measurement method
AssigneeMitsubishi Electric Corporation
InventorsShumpei Kameyama, Nobuki Kotake, Yutaka Kajiyama
Life of this patent
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Abstract
A laser radar device calculates a wind speed for each of a plurality of divided sections obtained by dividing a trajectory drawn by a laser beam in front of a wind turbine.
Claims9
A laser radar device for transmitting laser light ahead of a wind turbine and receiving scattered light of the laser light scattered at a transmission destination, the laser radar device being installed in a spinner portion of the wind turbine, the laser radar device comprising:
- processing circuitry
- to determine a divided section in which a laser beam of the laser light is present among a plurality of divided sections obtained by dividing a trajectory drawn by the laser beam in front of the wind turbine;
- per each divided section in which the laser beam is determined to be present, to analyze reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrate the calculated reception spectra;
- to store a reception spectrum calculated for each divided section;
- and
- to calculate a wind speed for each divided section using the reception spectrum for each divided section, wherein
- the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long.
A laser radar device for transmitting laser light ahead of a wind turbine and receiving scattered light of the laser light scattered at a transmission destination, the laser radar device being installed in a spinner portion of the wind turbine, the laser radar device comprising:
- a jig holding the laser radar device inside the spinner portion and fixed to a nacelle portion of the wind turbine in such a manner that the laser radar device does not rotate together with the spinner portion;
- a beam scanner for performing scanning with a laser beam of the laser light not depending on rotation of the wind turbine;
- to determine a divided section in which the laser beam is present among a plurality of divided sections obtained by dividing a trajectory drawn in front of the wind turbine by the laser beam with which the beam scanner has performed scanning;
- per each divided section the laser beam is determined to be present, to analyze reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrate the calculated reception spectra;
- processing circuitry to store a reception spectrum calculated for each divided section;
- and
- to calculate a wind speed for each divided section using the reception spectrum for each divided section, wherein
- the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long.
A wind measurement method of a laser radar device for transmitting laser light ahead of a wind turbine and receiving scattered light of the laser light scattered at a transmission destination, the laser radar device being installed in a spinner portion of the wind turbine, the wind measurement method comprising:
- determining a divided section in which a laser beam of the laser light is present among a plurality of divided sections obtained by dividing a trajectory drawn by the laser beam in front of the wind turbine;
- per each divided section in which the laser beam is determined to be present, analyzing reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrating the calculated reception spectra;
- storing a reception spectrum calculated for each divided section;
- and
- calculating a wind speed for each divided section using the reception spectrum for each divided section, wherein
- the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long.
Dependencies are inferred from the claim text.