Abstract
Modern wind turbines are mainly horizontal axis
and operate in bottom atmospheric boundary layer driven by
wind shear flow, therefore as the blades rotating the
aerodynamic load vary cyclically, with horizontal axis wind
turbine (HAWT) large-scaling the cyclical characteristic
becomes more obvious, shortening blade life and increasing cost
of wind turbine. As the development of wind turbine largescaling
is the essential trend, load fluctuation control is more
and more critical in HAWT design and manufacture. In
common, individual pitch control is introduced to solve the
problem, but cost much energy from electric net. In this paper,
a concept of telescopic blade root is introduced to reduce
fluctuate load induced by wind shear passively, and considering
the blades as rigid assessment is operated, meanwhile
aerodynamic model based on blade element method in order to
analysis the aerodynamic load on NREL Phase VI reference
based blade. The result shows that after introducing the
equipment the blade fatigue load can be released, lengthening
blade life.