Patent ID: 9677541
Date: 2017-06-13
CPC Classifications: F03D,F05B,Y02E

Claim:
1. A method for slowing down a wind turbine in case of emergency comprising: adjusting one or more rotor blades of the wind turbine with power control based on the principle of pitch control or active stall control; where each of the one or more rotor blades is equipped with at least one actuator that continuously compares the torques of the respective actuators against each other, as well as, compares stored threshold values for each actuator; and one or more holding brakes are applied, in order to hold the position of each of the one or more rotor blades where friction is used as the braking method; and operating a redundant emergency apparatus for each of the one or more rotor blades to close or release said one or more holding brakes (