Controle PD de oscilações no ângulo de pitch da plataforma de turbina eólica offshore flutuante

Abstract

This work presents a structural control methodology for floating offshore wind turbines (FOWT), using active control. The purpose of the control is to attenuate oscillations in the pitch angle, which cause vibrations in the structure and which negatively affect others control systems of the FOWT. This control results, therefore, in efficiency and safety gains for the whole set. The proposed control system is composed of a tuned mass damper (TMD) and a proportional-derivative (PD) controller. The controller calculates an external force that is applied to the mass of the TMD, improving its dynamic response to attenuate vibrations in the FOWT structure. To demonstrate the effectiveness of the proposed active TMD, simulations performed in the OpenFAST tool are presented, using the 5 MW wind turbine from the National Renewable Energy Laboratory (NREL) with the ITI Energy Barge. In the simulation results, the temporal responses of the dynamics with the proposed control system are compared with the responses of the cases without control and with passiveTMD, for constant wind and irregular waves. This comparison shows that the proposed control system better attenuates oscillations in the platformpitch angle, as well as reduces oscillations in the output power and speed of the generator.