Numerical analysis of floating wind turbines stability control strategy based on a novel tuned mass damper

Abstract

Floating wind turbines (FWTs) are affected by wind, wave, and flow loads, and hence, their its stability is difficult to be guaranteed. The traditional tuned mass damper (TMD) damping effect increases with the increase in its mass ratio, but increasing the TMD mass will cause an instability of the structure. In this paper, to improve the damping performance of TMD, a novel negative stiffness tuned mass damper (TMD-NS) is proposed to reduce the amplitude ratio and increase the tuning bandwidth. The dimensionless optimal parameters of the dynamic damper are obtained by a fixed-point theory. The dynamic model of an FWT with TMD-NS added to the nacelle is established, and the surge response of the nacelle under the random wind action based on cut-in wind speed, rated wind speed, and cutout wind speed is analyzed. Numerical simulation results show that the maximum damping rates of TMD-NS to nacelle displacement, velocity, and acceleration are 55.87%, 48.18%, and 7.19%, respectively. The results show that TMD-NS is better than the traditional TMD in decreasing the amplitude ratio of the main structure and increasing the tuning bandwidth.