Towards Pitch-Scheduled Drive Train Damping in Variable-Speed, Horizontal-Axis Large Wind Turbines

2006 ◽  
Author(s):  
A. Dixit ◽  
S. Suryanarayanan
Keyword(s):  
Wind Turbines ◽  
Drive Train ◽  
Horizontal Axis ◽  
Variable Speed ◽  
Large Wind

scholarly journals A novel method of drive train damping for large wind turbines

2018 ◽  
Vol 1037 ◽  
pp. 032033
Author(s):  
Y Jiang ◽  
S Liu ◽  
D Zhao ◽  
J Cai
Keyword(s):  
Wind Turbines ◽  
Drive Train ◽  
Novel Method ◽  
Large Wind

Full-Load Converter Connected Asynchronous Generators for MW Class Wind Turbines

2005 ◽  
Vol 29 (4) ◽  
pp. 341-351 ◽  
Author(s):  
Vladislav Akhmatov
Keyword(s):  
Wind Turbines ◽  
Short Circuit ◽  
Wind Farms ◽  
Variable Speed ◽  
Full Load ◽  
Frequency Converters ◽  
Fault Ride Through ◽  
System Operator ◽  
And Control ◽  
Large Wind

Wind turbines equipped with full-load converter-connected asynchronous generators are a known concept. These have rating up to hundreds of kW and are a feasible concept for MW class wind turbines and may have advantages when compared to conventional wind turbines with directly connected generators.* The concept requires the use of full-scale frequency converters, but the mechanical gearbox is smaller than in conventional wind turbines of the same rating. Application of smaller gearbox may reduce the no-load losses in the wind turbines, which is why such wind turbines with converter connected generators may start operation at a smaller wind speed. Wind turbines equipped with such converted connected asynchronous generators are pitch-controlled and variable-speed. This allows better performance and control. The converter control may be applied to support the grid voltage at short-circuit faults and to improve the fault-ride-through capability of the wind turbines, which makes the concepts relevant for large wind farms. The Danish transmission system operator Energinet-DK has implemented the general model of wind turbines equipped with converter connected asynchronous generators with the simulation tool Powerfactory (DlgSilent). The article presents Energinet-DK's experience of modeling this feasible wind turbine concept.

scholarly journals Flow Characteristics Study of Wind Turbine Blade with Vortex Generators

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Hao Hu ◽  
Xin-kai Li ◽  
Bo Gu
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Horizontal Axis ◽  
Vortex Generators ◽  
Propeller Shaft ◽  
Horizontal Axis Wind Turbine ◽  
Separation Line ◽  
Blade Root ◽  
Pneumatic Power ◽  
Large Wind

The blade root flow control is of particular importance to the aerodynamic characteristic of large wind turbines. The paper studies the feasibility of improving blade pneumatic power by applying vortex generators (VGs) to large variable propeller shaft horizontal axis wind turbines, with 2 MW variable propeller shaft horizontal axis wind turbine blades as research object. In the paper, three cases of VGs installation are designed; they are scattered in different chordwise position at the blade root, and then they are calculated, respectively, with CFD method. The results show that VGs installed in the separation line upstream, with the separation line of the blade root as a benchmark, show a better effect. Pneumatic power of blades increases by 0.6% by installing VGs. Although the effect on large wind turbines is not obvious, there is a space for optimization.

scholarly journals New Airfoils for Small Horizontal Axis Wind Turbines

1998 ◽  
Vol 120 (2) ◽  
pp. 108-114 ◽  
Author(s):  
P. Gigue`re ◽  
M. S. Selig
Keyword(s):  
Wind Turbines ◽  
Leading Edge ◽  
Reynolds Numbers ◽  
Horizontal Axis ◽  
Variable Speed ◽  
Edge Roughness ◽  
Horizontal Axis Wind Turbines ◽  
Wind Energy Systems ◽  
Drag Ratio ◽  
Lift To Drag Ratio

In a continuing effort to enhance the performance of small wind energy systems, one root airfoil and three primary airfoils were specifically designed for small horizontal axis wind turbines. These airfoils are intended primarily for 1–5 kW variable-speed wind turbines for both conventional (tapered/twisted) or pultruded blades. The four airfoils were wind-tunnel tested at Reynolds numbers between 100,000 and 500,000. Tests with simulated leading-edge roughness were also conducted. The results indicate that small variable-speed wind turbines should benefit from the use of the new airfoils which provide enhanced lift-to-drag ratio performance as compared with previously existing airfoils.

On the Design of Horizontal Axis Two-Bladed Hinged Wind Turbines

1984 ◽  
Vol 106 (2) ◽  
pp. 171-176 ◽  
Author(s):  
K. H. Hohenemser ◽  
A. H. P. Swift
Keyword(s):  
Angular Velocity ◽  
Wind Turbines ◽  
Horizontal Axis ◽  
Dynamic Loads ◽  
Helicopter Rotors ◽  
Blade Tip ◽  
Velocity Variations ◽  
Large Wind

Hinged two-bladed wind turbines are not necessarily free of disturbing vibrations. The combination of elastic or built-in blade coning with blade flapping about a conventional teeter hinge produces periodic blade angular velocity variations in the blade tip path plane with associated vibrations and dynamic loads. The paper discusses and evaluates various hinge configurations for two-bladed rotors and shows why the conventional teeter hinge leads to nonuniform blade angular velocity in the blade tip path plane. The solution to this problem adopted for two-bladed helicopter rotors, though complex, could be of interest for large wind turbines. A much simpler solution, calling for the suppression of blade flapping by passive blade cyclic pitch variation produced by a strong negative pitch-flap coupling, was found to be practical for upwind tail vane stabilized two-bladed wind turbines.

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