Patent ID: 9709033
Date: 2017-07-18
CPC Classifications: F03D,Y02E

Claim:
1. A method for controlling an individually pitched wind turbine during shutdown, said wind turbine comprising at least three wind turbine blades, the method comprising: receiving a shutdown command for stopping operation of the wind turbine; determining a blade parameter of each of the wind turbine blades; comparing the blade parameters of the wind turbine blades; selecting a shutdown strategy for the wind turbine from a group of two or more predefined shutdown strategies, based on the comparing; moving the wind turbine blades towards a feathered position in accordance with the selected shutdown strategy; monitoring the blade parameters of the wind turbine blades during shutdown; selecting a new shutdown strategy from the group of two or more shutdown strategies in the case that one or more predefined criteria is/are fulfilled; and continuing movement of the wind turbine blades towards the feathered position in accordance with the new shutdown strategy.