Turbines of the year: Innovations

WORLDWIDE: Wind power has not lost its ability to surprise, as this year's selection indicates.

Radical vision… Aerodyn’s two-blade, twin-rotor 15MW floating concept
Radical vision… Aerodyn’s two-blade, twin-rotor 15MW floating concept

15MW SCDnezzy2

The 15MW SCDnezzy2 fully integrated twin-rotor concept is Aerodyn Engineering's radical vision of next generation large-scale floating power plants. The closely interspaced two-bladed downwind turbine counter-rotate to balance opposing Coriolis forces, and relative blade positions are offset by 90 degrees to minimise rotor-blade interaction causing tip vortices related performance loss.

SCDnezzy2 has a specific power rating of 425W/m2. The twin 150-metre rotor solution lowers the centre of gravity substantially compared to a larger single rotor with the same specific power rating, positively impacting floater mass and cost.

Each in-house produced turbine is mounted at a ten-degree backward tilted tower in wind-flow direction for sufficient cable clearance and efficient load transfer. The droplet shape with a drag coefficient of 0.3-0.4Cd enhances floater stability, and the open V-shape is "closed" at the top by a cable, creating a compact, lightweight and structurally stiff triangular structure.

The tower's central bottom mounting flange to the Y-shape concrete floater comprises one long leg, two shorter legs, and three inward-facing buoyancy columns. Guy wires stabilise the tower and turbines and minimise tower-base bending moments for mass and cost savings. The long leg incorporates a dual-mode single-point catenary mooring/yawing system, eliminating the need for turbine yaw systems. The rotor speed of individual turbines is actively controlled, proving active yaw support to the installation's mainly passive yaw system.

Have you registered with us yet?

Register now to enjoy more articles
and free email bulletins.

Sign up now
Already registered?
Sign in