This FES unit describe the working and application of Flywheel energy storage systems. For more details contact sengar.avinash@outlook.com

1. FLYWHEEL AS A ENERGY
STORAGE DEVICE
By:Avinash Sengar
Enroll. No.- 383/10
DEPARTMENT OF ELECTRICAL
ENGINEERING

2. INTRODUCTION
 Flywheel energy storage (FES) works by
accelerating a rotor (flywheel)to a very high
speed and maintaining the energy in the
system as rotational energy.
 During extraction, principle of conservation
of energy is being followed.
 It is designed in which the flywheel device
saves and release energy when necessary.

3. BASIC DIAGRAM

4. MAIN COMPONENTS
• FES stores energy by constantly spinning a
compact rotor in a low-friction environment.
• Rotors made of high strength carbon fiber
filaments, and spinning at speeds from 20,000 to
over 50,000 rpm.
• Magnetic bearings are sometimes used instead of
mechanical bearings.
• The efficiency in the chamber is enhanced by the
creation of a rough vacuum.

5. APPLICATIONS

6. Flywheel in battery powered
bus- FLYBUS

10. Other Applications
 In 2013 Volvo announced a flywheel system
fitted to the rear axle of its S60 sedan.
 Wind Turbines.
 Rail vehicles.
 Rail electrification.
 Uninterrupted power supplies.
 Pulse power.
 Amusement rides.
 Pulse power

11. Grid energy storage
Beacon Power opened a 20 MW, (5 MWh
over 15 min) flywheel energy storage
plant in Stephentown, New York in 2011.

12. Merits of FES unit




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Highly efficient, Non-polluting.
Reliable, Long life.
Easily and inexpensively maintained, and safe.
Much higher charging and discharging rate.
Able to cyclic discharged to zero energy
without degrading
 The storage capacity is independent of temperature
fluctuations.
 Much higher energy storage efficiencies.
 High power output.

13. Demerits of FES unit
• Current flywheels have low specific energy. There
are safety concerns associated with flywheels due
to their high speed rotor and the possibility of it
breaking loose & releasing all of it's energy in an
uncontrolled manner.
• Flywheels are a less mature technology than
chemical batteries, and the current cost is too
high to make them competitive in the market.

14. References
http://en.wikipedia.org/wiki/Flywheel_energ
y_storage
http://www.beaconpower.com/products/ab
out-flywheels.asp
http://news.nationalgeographic.com/news/
energy/2011/2/110223-electric-gridflywheels-compressed-air/