Topic
Blade pitch
About: Blade pitch is a research topic. Over the lifetime, 5321 publications have been published within this topic receiving 63134 citations.
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TL;DR: In this article, an autopilot is applied to helicopter rotor flap-lag-torsion equations to obtain the control settings for a trimmed flight condition, and the rotor aerodynamic description includes a stage-space dynamic stall model for lift and for pitching moments.
Abstract: An autopilot is applied to helicopter rotor flap-lag-torsion equations to obtain the control settings for a trimmed flight condition. The rotor aerodynamic description includes a stage-space dynamic stall model for lift and for pitching moments. Thus, the rotor is trimmed for flight conditions in which significant stall and torsional deformations are present. The autopilot is extended to Q-bladed rotors by a series of time-delay terms. As a result, the optimum gains and time constants depend upon the number of blades as well as upon the torsional stiffness.
50 citations
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TL;DR: An adaptive sliding mode pump displacement controller and a back-stepping stroke piston controller are designed for the proposed pitch system such that the resulting pitch angle tracks its desired value regardless of external disturbances and uncertainties.
Abstract: A variable-displacement pump controlled pitch system is proposed to mitigate generator power and flap-wise load fluctuations for wind turbines The pitch system mainly consists of a variable-displacement hydraulic pump, a fixed-displacement hydraulic motor and a gear set The hydraulic motor can be accurately regulated by controlling the pump displacement and fluid flows to change the pitch angle through the gear set The detailed mathematical representation and dynamic characteristics of the proposed pitch system are thoroughly analyzed An adaptive sliding mode pump displacement controller and a back-stepping stroke piston controller are designed for the proposed pitch system such that the resulting pitch angle tracks its desired value regardless of external disturbances and uncertainties The effectiveness and control efficiency of the proposed pitch system and controllers have been verified by using realistic dataset of a 750 kW research wind turbine
50 citations
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TL;DR: In this paper, the starting performance of a small horizontal-axis wind turbine was investigated for blade pitch angles varying between 0 and 35° in 5° increments, and the aerodynamic torque was obtained from a quasi-steady blade element analysis.
50 citations
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20 Jun 2012TL;DR: A survey on low voltage ride-through capability (LVRT) solutions for permanent magnet synchronous generators (PMSG) is carried out along with a brief explanation of grid codes.
Abstract: Research of grid connected wind turbines has gained great interest in the recent years. This led to introduce guidelines and regulations regarding the connection of large wind farms to the electrical network. One of such guidelines is low voltage ride-through capability (LVRT). In this paper, a survey on recent LVRT solutions for permanent magnet synchronous generators (PMSG) is carried out along with a brief explanation of grid codes. Among those solutions is the control of fully rated converters, blade pitch angle control and capacitor sizing. Other solutions such as active crowbar rotor circuit and the DC bus energy storage circuit are illustrated. The survey extends to provide possibilities for the development of further LVRT research at the wind farm level using high power FACT devices.
50 citations
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TL;DR: In this paper, the authors investigated the effect of wind speed, rotor speed, yaw angle and blade pitch angle on the performance of a vertical axis wind turbine in the designed operating conditions.
50 citations