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Airborne Wind Turbines
Presented by
Parag Deshpande
Introduction
An Airborne Wind Turbine
(AWT) is a wind turbine with a
rotor supported in the air
without a tower.
It is connected to the ground
via tethers. And in some cases,
consist of a generator on
board, or sometimes on
ground.
History of Wind Turbines
• The first windmill used for
the production of electricity
was built in Scotland in July
1887 by Prof James Blyth of
Anderson's College,
Glasgow.
• Throughout the 20th
century, many people
developed small wind
stations suitable for farms
or residences, and larger
utility-scale wind generators
Types of Wind Turbines
1) Horizontal Axis
Wind Turbine
(HAWT)
2) Vertical Axis Wind
Turbine (VAWT)
3) Small Wind
turbines
4) Airborne Wind
Turbines (AWE) Horizontal Axis
Wind Turbine
(HAWT) Vertical Axis Wind
Turbine (VAWT)
Airborne Wind Energy
Systems
Ground-Gen systems - In
which the conversion of
mechanical energy into
electrical energy takes place
on the ground.
Fly-Gen systems - In which
such conversion is done on
the aircraft in the air.
Types of Airborne Wind Turbines
Ground-Generator Airborne
Wind Energy Systems
The different types Of Ground-
Gen AWES –
a) Leading Edge Inflatable (LEI)
Kite.
b) Supported Leading Edge (SLE)
Kite.
c) Foil Kite (design from
Skysails)
d) Glider (design from Ampyx
Power)
e) Swept rigid wing (design from
Enerkite)
f) Semi-rigid wing (design from
Kitegen)
Ground-Generator Airborne Wind Energy
Systems - Working
During the generation phase, the aircraft is driven in a way to produce a
lift force and consequently a traction (unwinding) force on the ropes
that induce the rotation of the electrical generators.
Fly-Gen Airborne Wind
Turbine
Different types of Fly-Gen AWES –
a) Plane with four turbines,
design by Makani Power.
b) Aircraft composed by a frame
of wings and turbines, design
by Joby Energy.
c) Toroidal lifting aerostat with a
wind turbine in the center,
called BAT (Buoyant Airborne
Turbine), design by Altaeros
Energies.
d) Static suspension quad-rotor
in autorotation, design by Sky
WindPower
a) Makani Power
This AWT takes off with the wing
plane in a vertical position, driven by
propellers thrust. This flight mode is
similar to a quad-copter flight and
rotors on AWT are used as engines.
Once all the rope length has been
unwound, the AWT changes flight
mode and becoming a tethered flight
airplane.
In this flight mode a circular flight
path is powered by the wind itself
and rotors on AWT are used as
generators to convert power from
the wind.
In order to land, a new change of
flight mode is performed, and the
AWT lands as a quad copter.
b) Joby Energy
This is similar to Makani, but
turbines are installed in the
joints of the frame.
In Joby's concept, the system is
assembled with modular
components, constructed from
multiple similar frames with
turbines.
The power generation method
and the take-off and landing
maneuvers are similar to those
of Makani concept.
c) Altaeros Energies
Instead of using wings lift to fly,
they use a ring shaped aerostat
with a wind turbine installed in its
interior.
The whole generator is lighter
than the air, so the take-off and
landing maneuvers are simplified,
and the only remaining issue is
the stabilization of the generator
in the right position relative to
the wind.
The aerostat is aerodynamically
shaped so that the absolute wind
generates lift that helps keeping a
high angle of altitude together
with the buoyancy force.
d) Sky WindPower
It is a large quad rotor with at least three identical
rotors mounted on an airframe that is linked to a
ground station with a rope having inner electrical
cables.
Take-off and landing maneuvers are similar to
those of Makani's and Joby's but generator
operation is different.
Once it reaches the operational altitude, the frame
is inclined at an adjustable controllable angle
relative to the wind (up to 50°) and the rotors
switch the functioning mode from motor to
generator. At this inclined position, the rotors
receive from their lower side a projection of the
natural wind parallel to their axes. This projection
of wind allows autorotation, thus generating both
electricity and thrust. Electricity flows to and from
the generator through the cable.
Sky Windpower tested two prototypes. They
claimed that a typical minimum wind speed for
autorotation and energy generation is round 10
m/s at an operational altitude.
Wind Power – Locations and
Availability
Future Scope
Though many innovative designs and ideas are patented under this airborne wind energy
sector, commercialization of the technology ideas has not achieved great success due to
various technology and regulatory challenges, space constraints, noise and aesthetics.
Conclusion
High altitude wind energy is currently a very promising resource for the sustainable
production of electrical energy. The amount of power and the large availability of winds that
blow between 300 and 10000 meters from the ground suggest that Airborne Wind Energy
Systems (AWESs) represent an important emerging renewable energy technology.
References
• Airborne Wind Turbines – A Technical Report by Scope e-Knowledge Centre Pvt. Ltd. – July 2013
• Airborne Wind Energy Systems: A review of the technologies
by - Antonello Cherubini, Andrea Papini, Rocco Vertechy, Marco Fontana
PERCRO SEES, TeCIP Institute, Scuola Superiore Sant'Anna, Pisa, Italy
Department of Industrial Engineering, University of Bologna, Italy.
• Airborne wind energy: Optimal locations and variability
by Cristina L. Archer, Luca Delle Monache, Daran L. Rife
College of Earth, Ocean, and Environment, University of Delaware, Newark,DE, US;
National Center for Atmospheric Research, Boulder, CO, United States
GL Garrad Hassan, San Diego, CA, United States
• Wikipedia.org-
https://en.wikipedia.org/wiki/Wind_power_in_India
https://en.wikipedia.org/wiki/Airborne_wind_turbine
• Open Energy Information –
http://en.openei.org/wiki/Wind_energy
• Turbines Info-
http://www.turbinesinfo.com/types-of-wind-turbines/

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Seminar airborne wind turbines

  • 1. Airborne Wind Turbines Presented by Parag Deshpande
  • 2. Introduction An Airborne Wind Turbine (AWT) is a wind turbine with a rotor supported in the air without a tower. It is connected to the ground via tethers. And in some cases, consist of a generator on board, or sometimes on ground.
  • 3. History of Wind Turbines • The first windmill used for the production of electricity was built in Scotland in July 1887 by Prof James Blyth of Anderson's College, Glasgow. • Throughout the 20th century, many people developed small wind stations suitable for farms or residences, and larger utility-scale wind generators
  • 4. Types of Wind Turbines 1) Horizontal Axis Wind Turbine (HAWT) 2) Vertical Axis Wind Turbine (VAWT) 3) Small Wind turbines 4) Airborne Wind Turbines (AWE) Horizontal Axis Wind Turbine (HAWT) Vertical Axis Wind Turbine (VAWT)
  • 5. Airborne Wind Energy Systems Ground-Gen systems - In which the conversion of mechanical energy into electrical energy takes place on the ground. Fly-Gen systems - In which such conversion is done on the aircraft in the air. Types of Airborne Wind Turbines
  • 6. Ground-Generator Airborne Wind Energy Systems The different types Of Ground- Gen AWES – a) Leading Edge Inflatable (LEI) Kite. b) Supported Leading Edge (SLE) Kite. c) Foil Kite (design from Skysails) d) Glider (design from Ampyx Power) e) Swept rigid wing (design from Enerkite) f) Semi-rigid wing (design from Kitegen)
  • 7. Ground-Generator Airborne Wind Energy Systems - Working During the generation phase, the aircraft is driven in a way to produce a lift force and consequently a traction (unwinding) force on the ropes that induce the rotation of the electrical generators.
  • 8. Fly-Gen Airborne Wind Turbine Different types of Fly-Gen AWES – a) Plane with four turbines, design by Makani Power. b) Aircraft composed by a frame of wings and turbines, design by Joby Energy. c) Toroidal lifting aerostat with a wind turbine in the center, called BAT (Buoyant Airborne Turbine), design by Altaeros Energies. d) Static suspension quad-rotor in autorotation, design by Sky WindPower
  • 9. a) Makani Power This AWT takes off with the wing plane in a vertical position, driven by propellers thrust. This flight mode is similar to a quad-copter flight and rotors on AWT are used as engines. Once all the rope length has been unwound, the AWT changes flight mode and becoming a tethered flight airplane. In this flight mode a circular flight path is powered by the wind itself and rotors on AWT are used as generators to convert power from the wind. In order to land, a new change of flight mode is performed, and the AWT lands as a quad copter.
  • 10. b) Joby Energy This is similar to Makani, but turbines are installed in the joints of the frame. In Joby's concept, the system is assembled with modular components, constructed from multiple similar frames with turbines. The power generation method and the take-off and landing maneuvers are similar to those of Makani concept.
  • 11. c) Altaeros Energies Instead of using wings lift to fly, they use a ring shaped aerostat with a wind turbine installed in its interior. The whole generator is lighter than the air, so the take-off and landing maneuvers are simplified, and the only remaining issue is the stabilization of the generator in the right position relative to the wind. The aerostat is aerodynamically shaped so that the absolute wind generates lift that helps keeping a high angle of altitude together with the buoyancy force.
  • 12. d) Sky WindPower It is a large quad rotor with at least three identical rotors mounted on an airframe that is linked to a ground station with a rope having inner electrical cables. Take-off and landing maneuvers are similar to those of Makani's and Joby's but generator operation is different. Once it reaches the operational altitude, the frame is inclined at an adjustable controllable angle relative to the wind (up to 50°) and the rotors switch the functioning mode from motor to generator. At this inclined position, the rotors receive from their lower side a projection of the natural wind parallel to their axes. This projection of wind allows autorotation, thus generating both electricity and thrust. Electricity flows to and from the generator through the cable. Sky Windpower tested two prototypes. They claimed that a typical minimum wind speed for autorotation and energy generation is round 10 m/s at an operational altitude.
  • 13. Wind Power – Locations and Availability
  • 14. Future Scope Though many innovative designs and ideas are patented under this airborne wind energy sector, commercialization of the technology ideas has not achieved great success due to various technology and regulatory challenges, space constraints, noise and aesthetics.
  • 15. Conclusion High altitude wind energy is currently a very promising resource for the sustainable production of electrical energy. The amount of power and the large availability of winds that blow between 300 and 10000 meters from the ground suggest that Airborne Wind Energy Systems (AWESs) represent an important emerging renewable energy technology.
  • 16. References • Airborne Wind Turbines – A Technical Report by Scope e-Knowledge Centre Pvt. Ltd. – July 2013 • Airborne Wind Energy Systems: A review of the technologies by - Antonello Cherubini, Andrea Papini, Rocco Vertechy, Marco Fontana PERCRO SEES, TeCIP Institute, Scuola Superiore Sant'Anna, Pisa, Italy Department of Industrial Engineering, University of Bologna, Italy. • Airborne wind energy: Optimal locations and variability by Cristina L. Archer, Luca Delle Monache, Daran L. Rife College of Earth, Ocean, and Environment, University of Delaware, Newark,DE, US; National Center for Atmospheric Research, Boulder, CO, United States GL Garrad Hassan, San Diego, CA, United States • Wikipedia.org- https://en.wikipedia.org/wiki/Wind_power_in_India https://en.wikipedia.org/wiki/Airborne_wind_turbine • Open Energy Information – http://en.openei.org/wiki/Wind_energy • Turbines Info- http://www.turbinesinfo.com/types-of-wind-turbines/