Stochastic Vibrations Control of Wind Turbine Blades Based on Wireless Sensor

Abstract

This paper presents an active controller design to suppress blade edgewise vibrations based on the signal from the wireless sensor. A thorough analysis on concepts for wireless sensors applications for blades is performed. Considering the structural dynamics subjected to gravity and turbulent aerodynamic loadings, a model described dynamics of rotating blades coupled with tower was applicated for control design. Taking the aerodynamic load input in edgewise direction and gravitational load as unknown disturbance input, a stochastic disturbance accommodating control approach is proposed to design a controller with estimate both state and unknown input by a minimum-variance unbiased estimator. The stability analysis proved that the closed loop system is bounded on mean square. In order to verify the performance of the minimum-variance unbiased estimator and the proposed SDAC, numerical simulations using Matlab have been carried out for a 5-MW wind turbine. It is shown the proposed control scheme can further reduce vibration displacement. This study provides a feasibility of future implementation structure control in wind turbine blades.