Study on Active-passive Integrated Vibration Control of Offshore Floating Wind Turbine Based on TMD-HMD

doi:10.3901/JME.2020.03.073

Abstract

Abstract: In harsh marine environment, random wind and wave loads may cause violent vibrations and large displacements of platform and tower top of offshore floating wind turbine, which seriously threatens the structural safety and stability of floating wind turbine. Therefore, an active-passive integrated vibration control strategy for floating wind turbine is proposed,in which,multiple tuned mass dampers (MTMD) are placed in the floating platform of Spar wind turbine and a tuned mass damper (TMD) is placed inside the nacelle at tower top. Firstly, a simplified 11-DOF space dynamics model of floating wind turbine is established based on Euler-Lagrange equation,in which the floating platform is considered a rigid body, the tower is considered an elastomer, and the cabin and TMD are considered as lumped mass points. The stiffness and damping parameters of the platform are estimated by Levenberg-Marquardt algorithm and the correctness of the model is verified by comparing with the FAST model. Then the parameters of TMD are optimized by using Van-Nguyen Dinh's method. Next, the hybrid mass damper (HMD) is formed by exerting active control force on the nacelle TMD and constituting TMD-HMD with the platform TMD, in which the active controller is designed by the linear quadratic regulator (LQR) method and its weight coefficients Q and R of LQR are optimized by the exhaustive method. Finally, the vibration suppression effects of TMD passive control only and TMD-HMD active-passive integrated control on dynamic responses of floating wind turbine are simulated respectively under typical wind and wave loads. The simulation results show:compared with TMD passive control, the vibration suppression effect of TMD-HMD active-passive integrated control increases by about 38% for the platform pitch angle and about 20% for the tower-top longitudinal displacement respectively, and the vibration energy is reduced by 72% and 40% respectively.

Key words: offshore floating wind turbine, MTMD, HMD, LQR, vibration suppression, dynamic response, active-passive integrated control

CLC Number:

O328
TK83

HE Erming, XIONG Bo, YANG Jiajia. Study on Active-passive Integrated Vibration Control of Offshore Floating Wind Turbine Based on TMD-HMD[J]. Journal of Mechanical Engineering, 2020, 56(3): 73-79.

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