Abstract
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.
Highlights
Wind energy is a kind of clean energy with high commercial value, and wind turbine is an important part of capturing and converting wind energy into electric energy [1]
The variable is brought into the state space expression of the aeroelastic system. e sliding mode function is defined as s BTPx, where P is the fourth-order symmetric positive definite square matrix. e LMI method is used to design the value of P matrix and determine the sliding mode function
For the flexible body of wind turbine blade, even if the small buffeting exists, the small static error can be accepted under the premise of response convergence, which can be well combined with the sliding mode controller. rough the analysis of vibration and limit cycle of LMI-based sliding mode control, we can conclude that the proposed algorithm can suppress the flutter vibration of blades and make the aeroelastic system converge with short stability time, which can suppress the high-frequency vibration at high wind speed
Summary
Wind energy is a kind of clean energy with high commercial value, and wind turbine is an important part of capturing and converting wind energy into electric energy [1]. Shock and Vibration elastic model in the reduced order wing and control surface state space are considered, and the suboptimal control method output feedback based on genetic algorithm is constructed to design the flutter suppression law. Rough the typical section analysis method, the aeroelastic vibration response of the blade in the case of high wind speed and high angle of attack is analyzed, and the active control process of sliding mode control of flutter is simulated. Sliding mode control is a simple and effective variable structure control method, which is flexible in physical realization, fast in response, and excellent in control effect. It has been applied in many industrial fields [15]
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