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Method and system for controlled shutdown of wind turbines

  • US 9,574,548 B2
  • Filed: 12/07/2012
  • Issued: 02/21/2017
  • Est. Priority Date: 12/08/2011
  • Status: Active Grant
First Claim
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1. A method for shutting down a wind turbine, the wind turbine comprising:

  • a power generator connected to a set of rotatable rotor blades via a drive train,a power converter comprising a generator side converter and a grid side converter separated by an intermediate DC circuit, andat least one of power dissipation and power storage means operatively connected to the intermediate DC circuit,wherein the method comprises;

    operating the wind turbine according to a first operating mode, wherein the first operating mode comprises a power control loop having feedback parameters indicating an amount of active power and an amount of reactive power supplied to an associated grid, andin response to a request to shut down the wind turbine, performing a controlled shutdown of the wind turbine in a second operating mode, wherein the controlled shutdown comprises controlling an output of the generator side converter using a power reference derived from a predefined generator torque-speed curve so that torque of the drive train has a constant direction, wherein the generator is connected to the associated grid during the controlled shutdown of the wind turbine and wherein the predefined generator torque-speed curve is not used during the first operating mode and the power control loop is not used during the second operating mode.

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