Pitch Control System for Large Scale Wind Turbines

摘要

Wind shear, tower shadow, and gravity seem to considerably disturb the quiet efficient operation of wind turbines. This study is the design of a pitching blade segment control system, using the NASA-DOE MOD O wind turbine as an example, to alleviate some of the problems associated with these phenomena, such as shortened lifetime and noise generation. The classical linear quadratic Gaussian optimal regulator approach is used in the control formulation. A quasi-steady aerodynamic analysis incorporating wind shear and tower shadow is utilized. An equivalent hinge model describes the turbine structural dynamics. Pitch, flap and lag blade degrees of freedeom are included as well as shaft torsion and generator dynamics. The study shows that the proposed control system can provide significant vibration and noise reductions as well as a cleaner power signal, better gust response and increased annual energy output. (ERA citation 08:004984)