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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03 May 2007
TL;DR: It is shown that for a thorough evaluation of active speed stall control, more knowledge is required about changes in the wind speed, and a considerable increase in generator system cost is necessary to enable active speed stalls control.
Abstract: The objectives of this paper are to investigate the feasibility of a 10 MW generator for a direct-drive wind turbine and to compare the generator systems for pitch control and for active speed stall control. The idea behind the active speed stall control concept is to make a rotor that is as simple as possible, and therefore very robust and suitable for offshore wind turbines. This is done by removing the pitch control of the blades. Above rated wind speed, the power is not controlled by controlling the pitch, but by controlling the rotor speed: the rotor speed is so much reduced that the aerodynamic power is limited to the rated value. A rough 10 MW permanent-magnet direct- drive generator design is presented, indicating that such a generator is feasible. It is shown that for a thorough evaluation of active speed stall control, more knowledge is required about changes in the wind speed. However, a considerable increase in generator system cost is necessary to enable active speed stall control.
148 citations
TL;DR: In this article, a 2-bladed rotor for low Re application fitted to an Air-X marine 400-W wind turbine was tested at a wind speed range of 3-6m/s.
148 citations
TL;DR: In this article, a comparison between ANSYS Workbench and Gambit meshing tools for the numerical modeling is performed to summarize a final numerical sequence for the Darrieus rotor performance.
143 citations
TL;DR: In this article, the dynamic and stability properties of wind turbine generators connected to power systems are discussed, as well as various schemes for torsional damping such as speed sensitive stabilizer and blade pitch control.
Abstract: This paper describes the dynamic and stability properties of wind turbine generators connected to power systems. Both synchronous and induction generators are considered. A comparison is made between wind turbines, steam, and hydro units. The unusual phenomena associated with wind turbines are emphasized. The general control requirements are discussed, as well as various schemes for torsional damping such as speed sensitive stabilizer and blade pitch control. Interaction between adjacent wind turbines in a "wind farm" is also considered.
143 citations
12 Jun 2005
TL;DR: In this article, the authors proposed a pitch angle control strategy based on the average wind speed and standard deviation of wind speed, and pitch angle was controlled using a generalized predictive control in all operating regions for wind turbine generator.
Abstract: Effective utilization of renewable energies such as wind energy is expected instead of the fossil fuel. Wind energy is not constant and windmill output is proportional to the cube of wind speed, which cause the generated power of wind turbine generators to fluctuate. In order to reduce fluctuating components, there is a method to control pitch angle of blades of windmill. We have proposed the pitch angle control using minimum variance control in a previous work. However, it is a controlled output power for only rated wind speed region. This paper presents a control strategy based on average wind speed and standard deviation of wind speed, and pitch angle control using a generalized predictive control in all operating regions for wind turbine generator. The simulation results with using actual detailed model for wind power system show effectiveness of the proposed method.
141 citations