ABSTRACT

This paper presents results from the Floating Offshore-wind Controls Advanced Laboratory (FOCAL) Experimental campaign performed at the University of Maine's (UMaine's) Harold Alfond Wind/Wave Ocean Engineering Laboratory (W2). The project involves four Froude-scaled test campaigns considering the International Energy Agency (IEA) Wind 15MW Reference Wind Turbine deployed on the VolturnUS-S semi-submersible platform with tuned-mass damper elements in the hull. The turbine employs real-time rotor torque and blade pitch control through the Reference OpenSource Controller (ROSCO), including the additional control strategies of ROSCO's thrust peak shaving and a floating feedback control loop. Results with the floating feedback control are considered in this paper and show a significant reduction in platform pitch motion and loads around the platform pitch natural frequency with minimal negative impact of rotor power quality.

INTRODUCTION

This paper presents testing results from the Floating Offshore-wind and Controls Advanced Laboratory (FOCAL) Experimental Program funded by the U.S. Department of Energy ARPA-e ATLANTIS program. The project aims to generate the first public floating offshore wind turbine (FOWT) scale model dataset to include advanced turbine controls, floating hull load mitigation technology, and hull flexibility to enable validation of FOWT engineering numerical tools. The experiments generated data for FOWT loads, motion, and performance, while operating in realistic wind/waves, and with advanced turbine and platform controls.

The FOCAL project involves four Froude-scaled test campaigns considering the International Energy Agency (IEA) Wind 15MW Reference Wind Turbine deployed on a VolturnUS-S inspired semi-submersible platform with tuned-mass damper elements in the hull. The turbine employs real-time rotor torque and blade pitch control through the Reference OpenSource Controller (ROSCO), including the additional control strategies of thrust peak shaving and a floating feedback control loop.

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