Flow physics of smart load control for wind turbine due to extreme wind shear

Based on the newly developed aero-servo-elastic platform containing an external deformable trailing edge flap PID controller, the effect of smart rotor control on blade flap-wise root moment on NREL/Upwind 5 MW reference wind turbine was investigated under extreme wind shear condition in accordance with the IEC standard. Results showed that, not only the blade flap-wise root moment was effectively reduced, but also this system was very helpful for the extreme load reduction of the tower, the drive-chain and the pitch control system etc. Eventually, this paper illustrated the control physics involved in the smart rotor control. Especially, this paper uncovered a phenomenon that the actively deformable trailing edge flap unfastened the strong coupling interactions between flow and blade due to EWS(Extreme Wind Shear).