REDUCTION EFFECT OF DYNAMIC LOADS OF FLOATING OFFSHORE WIND TURBINE-GENERATOR SYSTEMS BY FEEDFORWARD CONTROL BASED ON WIND SPEED

Abstract

The reduction effect of the dynamic loads of floating offshore wind turbine-generator systems by the feedforward-feedback control based on the previewed wind speed, which was developed in our previous study, is clarified through the theoretical analysis of the system response in the vicinity of an equilibrium operating point at the rated high-speed region. In the floating offshore wind turbine-generator system, the responses of the generator speed and platform pitch interfere; however, employing the feedforward control reduces their variations to the wind speed change in comparison with the gain-scheduled control of the generator speed. Furthermore, the response interference between the generator speed and the platform pitch is reduced, contributing to the improvement of their controllability.