Title: Energy storage technologies for intermittent renewable energy systems S R Awasthi Dr. Pragya Nema Consultant, CECL, Bhopal Professor, Electrical Engineering Department Ex. General Manager, BHEL
1Energy storage technologies for
intermittent renewable energy systemsS R
Awasthi Dr. Pragya Nema
Consultant, CECL, Bhopal Professor,
Electrical Engineering Department
Ex. General Manager, BHEL Netaji
Subhash Engineering College, Kolkata (W.B.)
2Contents
- Introduction
- Background of storage system
- Different energy storage technology
- Comparison of different storage technology
- Conclusion
3Introduction
- What is energy storage system for renewable
energy ? - Why is it required ?
- Function of energy storage system
4Background of storage system
- Storage is an essential unit that stores
unstable electric energy during wind and
photovoltaic power generation, which is sharply
growing new renewable energy, and supplies the
unstable energy to electric power system again in
necessary moment. If there is no such energy
storage unit, any kinds of serious problems like
sudden blackout occurs because of unstable
sunlight-dependent electricity supply. This
Storage takes an important part in the
electricity storage systems for households, the
medium-size system for industrial/commercial use,
and the extra-large system for power plants and
substations like Frequency Regulations
5 different Energy storage technologies
- Pumped storage
- Batteries
- Superconducting magnet energy storage
- Flywheel energy storage
- Regenerative fuel cell storage
- Compressed air energy storage
6Pumped storage
- A pumped storage hydro power plant may store huge
energy by pumping water from a lower reservoir to
a higher pond. In a pumped storage hydro plant,
we usually make the height of the reservoir equal
to a small hill and at bottom a cavity is made so
that water may not run away downward. - Water is pumped during off-peak times and may be
utilized to generate electricity. Other
innovations may store electricity in small
quantity but pumped storage hydro power plant may
store electricity in Megawatts (MW) or even
Gigawatts(GW).
7Batteries
Battery
Battery working
Battery Bank
8Flywheel energy storage
- Flywheel energy storage systems are one of energy
storage devices. They store energy mechanically
in the flywheel rotor by rotating the rotor while
as chemical batteries stores energy electrically.
When we want to use the stored energy in the
rotor, a generator is used to convert mechanical
energy to electrical energy. - Flywheel systems are not sensitive to temperature
since they are operating in a vacuum containment.
Therefore, the hybrid vehicle with flywheel
systems can run without any problem at very cold
or hot areas. And, flywheel systems can store
more energy per system weight compared to
chemical batteries, - The flywheel system is a very efficient energy
storage device, it can be used for various
applications.
9Superconducting magnet energy storage
- Superconducting magnetic energy storage systems
store energy in the magnetic field created by the
flow of direct current in a superconducting coil.
This advanced systems store energy within a
magnet and release it within a fraction of a
cycle.
10Regenerative fuel cell storage
- A fuel cell is an electrochemical cell that
converts a source fuel (from combustible
substances such as hydrogen, methane, propane,
and methanol) into an electric current. - A fuel cell is a device that generates
electricity by a chemical reaction. Every fuel
cell has two electrodes, one positive and one
negative, called, respectively, the anode and
cathode. The reactions that produce electricity
take place at the electrodes. - Hydrogen is the basic fuel, but fuel cells also
require oxygen. One great appeal of fuel cells is
that they generate electricity with very little
pollutionmuch of the hydrogen and oxygen used in
generating electricity ultimately combine to form
a harmless byproduct, namely water. -
11Compressed air energy storage
continue
- Energy from solar or wind and even electricity
from thermal power plant during off-peak period
may be utilized to compress air by compressor and
same air may be utilized to produce electricity
during peak-hour. - Compressed air energy storage is done in
underground caverns and abandoned mines. -
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