Active structural control of floating wind turbine with Multi-TMD based on LQR optimal control

For the reasons of lacking rigid foundations and the impact of wind-wave external loads, offshore floating wind turbines with additional motion and load operate at a more severe environment than onshore and bottom-fixed offshore wind turbines. In our work, a multiple tuned mass damper (TMD) control structure and active control method are studied to reduce the load on the barge-type floating wind turbine. These TMDs are considered to be installed both in the nacelle and platform and a state feedback controller is employed. To design an active structural controller, first, a motion constraint model with multiple TMDs is built according to the Euler-Lagrange equation. Then, we applied a linear quadratic (LQR) regulator to actively reduce the load of the turbines. Through the simulation results under different external loads, it comes to conclusion that with multiple active TMDs could reduce the main load of the wind turbines and improve generated power quality.