Abstract
Abstract. This paper investigates the load alleviation capabilities of an articulated tip device, where the outermost portion of the blade can rotate with respect to the rest of the blade. Passive, semi-passive and active solutions are developed for the tip rotation. In the passive and semi-passive configurations tip pitching is mainly driven by aerodynamic loads, while for the active case the rotation is obtained with an actuator commanded by a feedback control law. Each configuration is analyzed and tested using a high-fidelity aeroservoelastic simulation environment, by considering standard operative conditions as well as fault situations. The potential benefits of the proposed blade tip concepts are discussed in terms of performance and robustness.
Highlights
Introduction and motivationThe cost of energy (CoE) is the key parameter that determines the success of an energy source
A reduction in the CoE can be obtained by a variety of means, one of the most significant effects coming from an increase in the annual energy production (AEP)
The active tip device has the largest impact on energy capture, possibly due to the choice of operating it in region II
Summary
The cost of energy (CoE) is the key parameter that determines the success of an energy source. In recent years, both industry and the wind energy scientific community have focused their efforts on the reduction in the CoE, with the goal of increasing the competitiveness of energy from wind with respect to other technologies. A reduction in the CoE can be obtained by a variety of means, one of the most significant effects coming from an increase in the annual energy production (AEP). Together with other scale benefits typically associated with larger wind turbines, there is a very clearly marked trend towards bigger machines. In the offshore case, where logistics and transportation are very different from onshore, the tendency towards very large wind turbines is even clearer, the optimum size not having been reached yet
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