Experimental Investigation of Dynamic Load Control Strategies using Active Microflaps on Wind Turbine Blades.

摘要

This paper includes results from experiments with active dynamic load control using microflaps at the trailing edge of wind turbine blades. The focus of the research was the design of a Direct Inverse Controller based on neural networks and the comparison to a conventional PID-Controller. A control system consisting of a force sensor, a controller and the microflap as an actuator was designed and tested in the wind tunnel. For this purpose a test wing with constant cross section, based on the dedicated wind turbine airfoil AH 93-W-174 was equipped with a trailing edge microflap with a flap-chord of 1.6%c. Measurements were accomplished at the large wind tunnel of the Herman F?ttinger Institute (HFI) of the TU-Berlin. Wind gusts were simulated by varying the angle of attack of the airfoil model with a maximum angular velocity of 2.2°/s. The microflap could be deflected simultaneously with a deflection speed of approximately 300°/s. The flap deflection was achieved by digital servos mounted on the blade. All measurements were accomplished at a constant Reynolds number of 10~6.