GHOUSIA COLLEGE OF ENGINEERING
RAMANAGARAM
Under guidance:
ASST.PROF.
DEPARTMENT OF ELECTRICAL &ELECTRONICS ENGG.
INTRODUCTION
It is designed in which the flywheel battery
saves and releases energy when necessary.
 Flywheel battery resolves the problem of
incapability of solar power supply at night and
delays the time of supply.
Output characteristics of photovoltaic cell are
optimized in this system.
Quality & reliability in power supply is greatly
improved.
Modes of Operation
Mode 1: No energy is required by the load, and all
energy generated by the PV array is stored in the
flywheel.
Mode 2: The PV energy is greater than the load and
the surplus is stored in the flywheel.
Mode 3: The PV energy is less than the load and
the flywheel supplements the necessary
energy to match the load.
Mode 4: No PV energy is generated and the
flywheel supplies the load until fully discharged
Modes of operation
PHOTOVOLTAIC CELL
 A solar cell or photovoltaic cell is a device that converts
sunlight directly into electricity by the photovoltaic
effect.
 Solar cell is configured as a large-area p-n junction
made from silicon.
 If a piece of p-type silicon is placed in contact with a
piece of n-type silicon, then a diffusion of electrons
occurs from the region of high electron concentration
to low electron concentration.
 when the electrons diffuse across the p-n junction,
they recombine with holes on the p-type side.
 The electric field established across the p-n junction creates a
diode that promotes charge flow, known as drift current.
 This region where electrons and holes have diffused across
the junction is called the depletion region.
 This region no longer contains any mobile charge carriers
known as the space charge region.
Diagram of Flywheel energy storage unit
Merits of Flywheel energy storage unit
 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.
POWER REGULATION AND CONDITIONING
 Regulator circuitry is required to cyclically bring
the energy storage system on- and off-line to maintain
a constant supply of energy available to the load.
 If the PV array output dropped below a certain
threshold, the PV would be disconnected from the
load to be replaced by the flywheel battery which
would begin to decelerate and discharge.
 If the PV output rise above a certain threshold, the
flywheel battery would be disconnected from the load
and would begin to accelerate & charge from a port of
the array's output.
 Once the flywheel reached its design speed, it would
not require any further charging due to its long
rundown time-constant.
FLYWHEEL BATTERY USED IN SOME DIFFERENT
AREAS ARE SHOWN BELOW :
Wasted heat is storage
Storage system
Satellite Placed in
Head phone battery
CONCLUSION
 Reduce cost of flywheel rotor and advanced
magnetic bearing.
Mass will produced with quality.
Develop light weight vacuum containment vessel.
Reduced over all system weight.
With the proposed system, the PV array can satisfy
the load for a prolonged duration.
REFERENCES
Tang Shuangqing Zuo Weiwei Liao Daoxum A new
flywheel energy storage system for distributed
generation.
2) Jiancheng Zhang; Zhiye Chen; Lijun Cai; Yuhua Zhao.
"Flywheel energy storage system design for distribution
network", IEEE on Power Engineering Society Winter
Meeting, 2000, Vol. 4: 2619 –2623.
3) Yuanfang Zhou, Renshan Xiao, Jingzhang Liao, Shizuo Li.
"Design Researches on Rare-Earth Permanent
Magnetic Brushless D.C. Motors", Guangxi Elctric Power
Technology in China, 1996, Vol. 2:15-20.
4) Reinke, L.J. "Tutorial overview of flywheel energy
storage in a photovoltaic power generation system",
vol.2: 1161 –1164.
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