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Wind power generation system, device using wind power generation system, and method for operating same

  • US 9,231,441 B2
  • Filed: 04/25/2011
  • Issued: 01/05/2016
  • Est. Priority Date: 04/25/2011
  • Status: Active Grant
First Claim
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1. A method for operating a wind power generation system, the system comprising:

  • a main wind turbine that generates mainly power supplied to a load and/or a power grid;

    an auxiliary wind turbine that supplies generated power to an auxiliary machine that controls a pitch angle of the main wind turbine and controls a yaw of the main wind turbine, that is a downwind type wind turbine that generates power in a state in which a blade of the auxiliary wind turbine faces downwind, and to which a permanent magnet type generator is mounted; and

    an anemometer that measures a wind speed,wherein the downwind type wind turbine is able to generate power in a wider wind speed range than a wind speed range in which power generation by the main wind turbine is possible,the auxiliary wind turbine rotates in a free yaw condition until the wind speed returns to within the wind speed range in which the power generation by the main wind turbine is possible after the wind speed is out of the wind speed range in which the power generation by the main wind turbine is possible, generated power of the auxiliary wind turbine drives the auxiliary machine to control the pitch angle or yaw of the main wind turbine when the wind speed returns to within the wind speed range in which the power generation by the main wind turbine is possible, and the power generation of the main wind turbine is restarted,wherein the downwind type wind turbine is able to generate power at a higher wind speed than a cut-out wind speed of the wind speed range in which the power generation by the main wind turbine is possible,the auxiliary wind turbine is able to rotate in the free yaw condition until the wind speed returns to the cut-out wind speed of the main wind turbine or less after the wind speed is over the cut-out wind speed, generated power of the auxiliary wind turbine drives the auxiliary machine to control the pitch angle or yaw of the main wind turbine when the wind speed returns to the cut-out wind speed or less, and power generation of the main wind turbine is restarted.

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