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Classification: Internal 2011-03-14 Dynamic Response and Control of the Hywind Demo Floating Wind Turbine.

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Presentation on theme: "Classification: Internal 2011-03-14 Dynamic Response and Control of the Hywind Demo Floating Wind Turbine."— Presentation transcript:

1 Classification: Internal Dynamic Response and Control of the Hywind Demo Floating Wind Turbine

2 Classification: Internal The Hywind Concept Main particulars for HYWIND Demo Turbine power : 2.3 MW Turbine weight : 138 tons Draft hull : 100 m Nacelle height : 65 m Rotor diameter : 82.4 m Water depth : 150–700 m Displacement : 5300 t Mooring : 3 lines Diameter at water line: 6 m Diam. submerged body: 8,3 m

3 Classification: Internal Conventional Wind Turbine Control System Steady state power coefficient surface and thrust force characteristics Negative damping contribution from rotor thrust force above the rated wind speed

4 Classification: Internal Conventional Wind Turbine Control System Example of stable (solid line) and unstable (dashed line) behaviour of Hywind Demo with and without use of a stabilizing floater motion controller. Hywind Demo was shut down after 250 seconds with use of the unstable conventional controller.

5 Classification: Internal MEASUREMENTS: Sea airgap. Sea current velocity and direction, and wave direction. Heave and pitch motion. Tower strains. Wind speed measurement at the nacelle. Nacelle yaw angle. Power production.

6 Classification: Internal Comparison Between Measurements and Simulations: Small Wave Condition Mean wind speed13.6 m/s Turbulence intensity11.4 % Significant wave height2.1 m Characteristic peak period7.7 s Tower Pitch Angle Mean [deg] Std [deg] Min [deg] Max [deg] Simulation Measurement

7 Classification: Internal Comparison Between Measurements and Simulations Moderate Wave Condition Mean wind speed16.8 m/s Turbulence intensity10.2 % Significant wave height3.5 m Characteristic peak period9.8 s Tower Pitch Angle Mean [deg] Std [deg] Min [deg] Max [deg] Simulation Measurement

8 Classification: Internal Measurements: Controller Comparison – Small Wave Condition Wind SpeedMean [m/s] Turb [%] Min [m/s] Max [m/s] Controller Controller Wave ElevationHs [m] Tp [s] Min [m] Max [m] Controller Controller Wave and wind environment:

9 Classification: Internal Tower Pitch Angle Mean [deg] Std [%] Min [deg] Max [deg] Controller Controller Tower StrainStd [mum/m] Min [mum/m] Max [mum/m] Controller Controller Measurements: Controller Comparison – Small Wave Condition Dynamic responses:

10 Classification: Internal Wind SpeedMean [m/s] Turb [%] Min [m/s] Max [m/s] Controller Controller Wave ElevationHs [m] Tp [s] Min [m] Max [m] Controller Controller Measurements: Controller Comparison – Moderate Wave Condition Wave and wind environment:

11 Classification: Internal Tower Pitch Angle Mean [deg] Std [deg] Min [deg] Max [deg] Controller Controller Tower StrainStd [mum/m] Min [mum/m] Max [mum/m] Controller Controller Measurements: Controller Comparison – Moderate Wave Condition Dynamic responses:

12 Classification: Internal Conclusions It is demonstrated that a stabilizing floater motion controller is required for a floating wind turbine. Simulations and measurements are compared for wind speeds above rated wind speed. Good agreement is obtained in small as well as moderate sea states. Two different stabilizing controllers are compared by full scale testing. A significant difference in the response at resonance is observed. This difference is important to the fatigue life of the tower. The range of variation of typical wind turbine parameters like rotor speed, blade pitch angle and active power production are similar to what is observed for fixed foundation wind turbines.

13 Classification: Internal Dynamic Response and Control of the Hywind Demo Floating Wind Turbine Bjørn Skaare Principal Researcher New Energy tel: Thank you!


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