scholarly journals Control Strategies for Variable-speed Fixed-pitch Wind Turbines

Wind Power ◽  
10.5772/8357 ◽  
2010 ◽  
Author(s):  
Bunlung Neammanee ◽  
Somporn Sirisumrannukul ◽  
Somchai Chatrat
Keyword(s):  
Wind Turbines ◽  
Control Strategies ◽  
Variable Speed ◽  
Fixed Pitch

Nonlinear adaptive power tracking control of variable-speed wind turbines

2018 ◽  
Vol 233 (3) ◽  
pp. 289-302
Author(s):  
Manuel Gámez ◽  
Ollin Peñaloza
Keyword(s):  
Wind Speed ◽  
Wind Turbines ◽  
Wind Profile ◽  
Control Strategies ◽  
Variable Speed ◽  
System Parameters ◽  
Fast Wind ◽  
Power Regulation ◽  
Adaptive Power ◽  
Regulation And Tracking

Various power control strategies in variable-speed wind turbines assume that the whole system parameters are known and accurate wind speed measurements are available, which is not necessarily satisfied in practice. In this article, two nonlinear adaptive control strategies, which are independent on the knowledge of the system parameters and the wind speed measurements, are proposed for power regulation and tracking, in variable-speed wind turbines. One of these strategies does not even require the rotor acceleration, differently from other works. Both control strategies are formally proven by the Lyapunov method. The effectiveness of the proposed controllers is illustrated using the FAST wind turbine simulator under a turbulent wind profile.

Load Alleviation on Wind Turbine Blades Using Variable Airfoil Geometry

2005 ◽  
Vol 29 (2) ◽  
pp. 169-182 ◽  
Author(s):  
Santiago Basualdo
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Theoretical Study ◽  
Control Strategies ◽  
Effective Means ◽  
Turbine Blades ◽  
Two Dimensional ◽  
Variable Speed ◽  
Wind Turbine Blades ◽  
Second Derivatives

A two-dimensional theoretical study of the aeroelastic behaviour of an airfoil has been performed, whose geometry can be altered using a rear-mounted flap. This device is governed by a controller, whose objective is to reduce the airfoil displacements and, therefore, the stresses present in a real blade. The aerodynamic problem was solved numerically by a panel method using the potential theory, suitable for modelling attached flows. It is therefore mostly applicable for Pitch Regulated Variable Speed (PRVS) wind turbines, which mainly operate under this flow condition. The results show evident reductions in the airfoil displacements by using simple control strategies having the airfoil position and its first and second derivatives as input, especially at the system's eigenfrequency. The use of variable airfoil geometry is an effective means of reducing the vibration magnitudes of an airfoil that represents a section of a wind turbine blade, when subject to stochastic wind signals. The results of this investigation encourage further investigations with 3D aeroelastic models to predict the reduction in loads in real wind turbines.

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