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, a fault-tolerant control (FTC) scheme was proposed for wind turbine pitch actuator faults to recover the nominal pitch dynamics, which is based on estimation of pitch system states and fault indicator function using an adaptive step-by-step sliding mode observer.
120 citations
TL;DR: In this article, a load frequency controller is designed for isolated wind diesel hybrid power systems, and its effect on the transient performance of the system is evaluated, both for continuous and discrete control cases.
120 citations
TL;DR: In this article, the effects of preset toe-in and toe-out turbine blade pitch angles were investigated in an open-air wind tunnel facility to investigate the effect of blade mount-point offset.
Abstract: A high solidity, small scale, 2.5m diameter by 3m high Vertical Axis Wind Turbine (VAWT) consisting of three NACA 0015 profile blades, each with a span of 3m and a chord length of 0.4m, was tested in an open-air wind tunnel facility to investigate the effects of preset toe-in and toe-out turbine blade pitch. The effect of blade mount-point offset was also investigated. The results from these tests are presented for a range of tip speed ratios, and compared with an extensive base data set obtained for a nominal wind speed of 10m/s. Results show measured performance decreases of up to 47% for toe-in, and increases of up to 29% for toe-out blade pitch angles, relative to the zero preset pitch case. Also, blade mount-point offset tests indicate decreases in performance as the mount location is moved from mid-chord towards the leading edge, as a result of an inherent toe-in condition. Observations indicate that these performance decreases may be minimized by compensating for the blade mount offset with a toe-o...
117 citations
TL;DR: In this article, a small Darrieus hydrokinetic turbine with fixed pitch blades typically suffers from poor starting torque, low efficiency and shaking due to large fluctuations in both radial and tangential force with azimuth angle.
116 citations
Patent•
01 Jul 2002
TL;DR: In this article, a planar element (10) and a cooling device (12) are used to dehumidify a gaseous medium in an essentially enclosed chamber inside a wind energy installation.
Abstract: The invention relates to a wind energy installation, in particular to a wind energy installation comprising a device for dehumidifying a gaseous medium in an essentially enclosed chamber inside said wind energy installation. The aim of the invention is to minimise the human and logistical resources required to maintain the functional capacity of the device and to simplify the construction of the device, to achieve a virtually maintenance-free operation. To achieve this, the device comprises a first planar element (10) and a cooling device (12) for cooling the first element to a temperature below the ambient temperature.
115 citations