Floating wind turbine control
For floating offshore wind turbines, it is necessary to accurately measure the roll and pitch motion of the wind mast caused by the waves, as this induces a big change in the apparent wind speed at the nacelle. This subsequently induces larger movements. To limit these movements, active pitch control in real time of the wind turbine blades is used.
The motion control system consists of a controller whose purpose is to explicitly stabilize and reduce the floating system motions and keep the structural responses at or below the levels assumed in design.
An important input to the control algorithm is an accurate Motion Reference Unit, measuring Heave/Surge/Sway and Roll/Pitch/Yaw in real sea conditions.
The NORSUB MRU is ideal for this application due to its very accurate roll and pitch measurements during horizontal accelerations.