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Blade pitch

About: Blade pitch is a research topic. Over the lifetime, 5321 publications have been published within this topic receiving 63134 citations.


Papers
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Proceedings ArticleDOI
06 Oct 2002
TL;DR: In this article, a variable-pitch straight-blade type of vertical-axis wind turbine is proposed to realize the optimum control of the pitch angles of the blades on a variable pitch straight blade type of wind turbine.
Abstract: We propose a new approach to realize the optimum control of the pitch angles of the blades on a variable-pitch straight-blade type of vertical-axis wind turbine. After deriving the power coefficient and the tip speed ratio of the turbine by merging the single-stage momentum theory and the blade element analysis, we can solve the stationary problems by using the Calculus of Variations and obtain the optimum pitch-angle control law on a tip speed ratio and calculate the power coefficient.

19 citations

Proceedings ArticleDOI
13 Oct 2011
TL;DR: This paper models a ballast-stabilized floating wind turbine, and suggests a linear quadratic regulator (LQR) in combination with a wind estimator and a state observer, which clearly demonstrates better generator speed and power tracking while reducing fatigue loads.
Abstract: Offshore wind energy capitalizes on the higher and less turbulent wind speeds at sea. The use of floating structures for deeper waters is being explored. The control objective is a tradeoff between power capture and fatigue, especially that produced by the oscillations caused by the reduced structural stiffness of a floating installation in combination with a coupling between the fore-aft motion of the tower and the blade pitch. To address this problem, the present paper models a ballast-stabilized floating wind turbine, and suggests a linear quadratic regulator (LQR) in combination with a wind estimator and a state observer. The results are simulated using aero elastic code and analysed in terms of damage equivalent loads. When compared to a baseline controller, this controller clearly demonstrates better generator speed and power tracking while reducing fatigue loads.

19 citations

Patent
04 May 2005
TL;DR: In this paper, a method for controlling and adjusting a wind turbine consisting of a machine housing that can be displaced by an azimuth angle, at least one rotor blade and a power supply for a spin mode is presented.
Abstract: The invention relates to a method for controlling and adjusting a wind turbine comprising a machine housing that can be displaced by an azimuth angle, at least one rotor blade that can be displaced about its longitudinal axis and a power supply for a spin mode. Said method comprises the following steps: a control unit determines an angular position for the machine housing and one or more displacement angles for the rotor blade or blades from measured values (v) for the wind speed and the wind direction; if a measured wind speed exceeds a predetermined speed value (v1*, v2*), at least one azimuth drive that is fed by the power supply displaces the machine housing into the angular position (α) that has been determined by the control unit and at least one pitch drive that is fed by the power supply displaces the rotor blade or blades into the angular position (ζ) that has been determined by the control unit. When in the set position, the rotor blade or blades rotate(s) at a speed in a predetermined speed range.

19 citations

Patent
16 Oct 2013
TL;DR: In this paper, a rotor blade state detection system fitted to the frame construction detects the state of the rotor blades of a wind energy installation is described, and a power and/or data cable for connecting the robot to a control and evaluation station on the ground, for example, during use is provided.
Abstract: The robot described here is used to inspect rotor blades of wind energy installations. A frame construction has an inner opening, which surrounds a rotor blade during use, and a plurality of propellers for a vertical flying movement of the robot. A rotor blade state detection system fitted to the frame construction detects the state of the rotor blades. A power and/or data cable for connecting the robot to a control and evaluation station on the ground, for example, during use is preferably provided.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of extreme typhoon on the aerodynamic performance of a 5MW OC3-Hywind floating offshore wind turbine (FOWT) system has been investigated, based on the Aero-Hydro-Servo-Elastic FAST code.

19 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202377
2022163
202184
2020110
2019105
2018109