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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Patent•
24 Jan 2003TL;DR: In this article, a wind turbine includes a blade pitch control system to vary a pitch of one or more blades and a turbine controller coupled with the blade pitch controller system to provide power during a first mode of operation.
Abstract: A wind turbine. The wind turbine includes a blade pitch control system to vary a pitch of one or more blades and a turbine controller coupled with the blade pitch control system. A first power source is coupled with the turbine controller and with the blade pitch control system to provide power during a first mode of operation. Uninterruptible power supplies coupled to the turbine controller and with the blade pitch control system to provide power during a second mode of operation. The turbine controller detects a transition from the first mode of operation to the second mode of operation and causes the blade pitch control system to vary the pitch of the one or more blades in response to the transition.
128 citations
Patent•
15 Jun 1978
TL;DR: In this article, the pitch angle of the wind turbine blades is controlled in a closed loop manner to maintain either a constant generator speed for isolated power generating stations or when the generator is synchronized to the load, or constant generator output power or shaft torque when connected to an electrical grid.
Abstract: Wind energy is used to drive a wind turbine, which is in turn connected to an electrical generator to produce electrical power. The pitch angle of the wind turbine blades is controlled in a closed loop manner to maintain either a constant generator speed for isolated power generating stations or when the generator is synchronized to the load, or constant generator output power or shaft torque when the generator is connected to an electrical grid. Open loop acceleration and deceleration schedules are provided to minimize blade stress and shaft torque variations during start up and shutdown transients, limiting blade angle excursions as a function of wind velocity and speed. The schedules may be implemented either electronically or by a suitably programmed digital computer. The gains in the speed, torque and power loop controls are scheduled as a function of average wind velocity to optimize stability and response. An anticipatory blade angle schedule responsive to instantaneous wind velocity is added to the desired blade angle reference from the closed loop controls to minimize transient excursions in output power or generator speed resulting from wind gusts.
124 citations
Patent•
02 Mar 2001
TL;DR: In this paper, the authors proposed a lightning protection system for a wind power installation to avoid cited drawbacks and, in particular, to minimize the number of disturbances to the electronics caused by sparkovers occurring on the spark gaps.
Abstract: The invention relates to a wind power installation. Modern wind power installations are regularly equipped with a lightning protection system. The aim of the invention is to avoid cited drawbacks and, in particular, to minimize the number of disturbances to the electronics caused by sparkovers occurring on the spark gaps. The invention also relates to a wind power installation comprising a device for continuously discharging electrostatic charge from at least one rotor blade of a wind power installation.
122 citations
TL;DR: In this paper, the authors employed an efficient inverse reliability approach which is shown to predict reasonably accurate long-term loads when compared to the more expensive direct integration of conditional load distributions for different environmental (wind and wave) conditions.
121 citations
TL;DR: In this paper, the authors investigated the load mitigation potential of passive tuned mass dampers for a 5MW offshore wind turbine supported by a monopile, and subjected to realistic external conditions that include wind-wave misalignment.
120 citations