Design of a nonlinear multi-input–multi-output sliding mode pitch angle and plunge controller for a 5MW wind turbine blade tip

2019 ◽  
Vol 41 (23) ◽  
pp. 2929-2943
Author(s):  
Ranjeet Agarwala ◽  
Robert A. Chin ◽  
Praveen Malali
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Pitch Angle ◽  
Sliding Mode ◽  
Wind Turbine Blade ◽  
Blade Tip

scholarly journals Aeroelastic Flutter and Sliding Mode Control of Wind Turbine Blade

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Lin Chang ◽  
Yingjie Yu ◽  
Tingrui Liu
Keyword(s):  
Sliding Mode Control ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Sliding Mode ◽  
Wind Turbine Blade ◽  
Sliding Mode Controller ◽  
Control Effect ◽  
Aeroelastic System ◽  
Mode Control ◽  
Aeroelastic Flutter

Flutter is an important form of wind turbine blade failure. Based on damping analysis, synthetically considering aeroelastic vibration instability of the blade and using the parameter fitting method, the aeroelastic flutter model of the pretwisted blade is built, with the simulation and emulation of flap and lead-lag directions flutter of the 2D dangerous cross section realized. Through the construction of two controllers, modular combinatorial sliding mode controller and sliding mode controller based on LMI for parameterized design suppress blade aeroelastic flutter. The results show that a better control effect can be achieved on the premise of the design of the precise parameters of the controller: the proposed sliding mode control algorithm based on LMI can effectively act on the aeroelastic system of the blade, significantly reduce the vibration frequency, and make the aeroelastic system converge to an acceptable static difference in a short time, which proves the effectiveness of sliding mode control in suppressing high-frequency vibration under high wind speed.

Wind Turbine Blade Tip Flow and Noise Prediction by Large-eddy Simulation

2004 ◽  
Vol 126 (4) ◽  
pp. 1017-1024 ◽  
Author(s):  
Oliver Fleig ◽  
Makoto Iida ◽  
Chuichi Arakawa
Keyword(s):  
Large Eddy Simulation ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Acoustic Emissions ◽  
Wind Turbine Blade ◽  
Tip Vortex ◽  
Aerodynamic Noise ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Blade Tip

The purpose of this research is to investigate the physical mechanisms associated with broadband tip vortex noise caused by rotating wind turbines. The flow and acoustic field around a wind turbine blade is simulated using compressible large-eddy simulation and direct noise simulation, with emphasis on the blade tip region. The far field aerodynamic noise is modeled using acoustic analogy. Aerodynamic performance and acoustic emissions are predicted for the actual tip shape and an ogee type tip shape. For the ogee type tip shape the sound pressure level decreases by 5 dB for frequencies above 4 kHz.

Analysis of Structural Vibrations of Vertical Axis Wind Turbine Blades via Hamilton’s Principle — Part 3: Pitch Angle and Equilibrium State

2021 ◽  
pp. 2150070
Author(s):  
Jianyou Huang ◽  
Chia-Ou Chang ◽  
Chien-Cheng Chang
Keyword(s):  
Exact Solution ◽  
Equilibrium State ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Pitch Angle ◽  
Coupling Effect ◽  
Turbine Blades ◽  
Vertical Axis ◽  
Wind Turbine Blade ◽  
Vertical Axis Wind Turbine

Pitch angle is one of the most important parameters of wind turbine blade. This study is aimed to investigate the effect of the pitch angle on the deformation of a VAWT. Lagrangian mechanics and Euler’s beam theory are used to derive the motion equations of linear structural vibration for straight blade vertical axis wind turbine blade with the pitch angle [Formula: see text]. The complete equations of motion take account of the 4-DOF deformation of flexural–flexural–torsion–extension as well as the material damping. Vibration analysis of generalized displacement about the equilibrium state (GDAES) is carried out with respect to the displacement of the equilibrium state (DOES), which is separated from the motion of vibration. After simplifying the equilibrium equation of 4-DOF into 1-DOF system, the exact solution of displacement [Formula: see text] of the equilibrium state is derived. The correction [Formula: see text] of [Formula: see text] due to the pitch angle and the characteristics of [Formula: see text] with constant linear speed are analyzed. Furthermore, we investigate the coupling effect of lateral bending and axial extension of the blade on [Formula: see text] is analyzed. Finally, the exact solution of [Formula: see text] is verified by the central difference method.

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