It Describes about needs of energy storage and variations in energy demand.Energy storage is an important solution to get uninterrupted,flexible and reliable power supply. Energy storage can reduce the drawbacks of intermittent resources by storing the excess energy when the sun shine is more and it is utilized during night time.

1. Need of Energy Storage
and
Variations in Energy Demand
Prepared By,
Maithili Periyannan
Kumaraguru College of Technology, Coimbatore

2. STORAGE: HISTORICAL PERSPECTIVE,
INTRODUCTION AND CHANGES
Outline
•Storage Needs
•Variations in Energy
Demand and Supply

3. What is Energy?
Energy is defined as the ability to do work.
Energy can be found in many things and can take
different forms.
For example, kinetic energy(energy of motion),chemical energy
(the potential energy of chemical bonds) and potential
energy(energy due to an object's position or structure)
Energy is never lost, but it can be converted from one
form to another.

4. STORAGE NEEDS
Why Energy Storage?
We need a secure, reliable electricity supply.
Need electricity supply 24 hours a day.
Need to make more use of renewable energy
resources, such as solar and wind.
To reduce our reliance on non-renewable fossil fuels
such as oil and gas.

5. Why Energy Storage?
Conversion of excess electricity into a different form of
energy
It can be reconverted into electricity with minimum
losses
This can be done to reduce the gap in supply and
demand of electricity.
It can be applied to both conventional sources of
electricity and renewable energy

6. Low power application in isolated areas, essentially to
feed transducers and emergency terminals.
Medium power applications in isolated areas (individual
electrical systems , town supply)
Network connection application with peak levelling
Power quality control applications
Electricity storage systems

8. It’s not so easy to use solar & wind for all our needs.
The clouds pass the sun and the wind gusts fast and slow
Solar power and wind power are not always available
The solution to this problem lies in energy storage.
We can have a power supply that is available 24/7 by
storing the energy generated from Solar and Wind.
RES Drawbacks

10. Difference Between RES & non-RES

11. Use of renewable electricity generation, improved energy
storage technologies have several benefits:
• Security: A more efficient grid that is more resistant to disruptions.
• Environment: Decreased carbon dioxide emissions from a greater use of clean
electricity.
• Economy: Increase in the economic value of wind and solar power and
strengthened U.S. competitiveness in the clean energy race.
• Jobs: New income sources for rural landowners and tax revenues for wind and solar
development areas. More jobs in supporting sectors such as manufacturing,
engineering, construction, transportation and finance.

12. The following list includes a variety of types of energy storage:
• Biological
Starch
Glycogen
• Chemical
 Hydrogen
Biofuels
Liquid Nitrogen
• Electrical
Capacitor
Super-capacitor
Superconducting magnetic energy storage
Types of Energy Storage

13. •Mechanical
Compressed air energy storage (CAES)
Flywheel energy storage
Spring
Gravitational Potential energy storage device
Hydroelectric energy storage
•Electrochemical
Batteries
Flow battery
Fuel Cell
Ultra-Battery

14. •Thermal
Ice Storage
Molten Salt
Steam Accumulator
Solar Pond
Hot Bricks
Cryogenic liquid air or Nitrogen
Seasonal Thermal Store

15. Variations in Energy Demand
• Demand for electricity in the utility system is varies in a hourly basis,
daily basis or season to season.
Solution:
• Inter connected network
• Use Newer plants used for base load and older plants for additional
loads
• Construct not expensive, low infrastructure small plants
• Energy storage systems

16. • Demand<supply----storage of excess energy
• Demand> supply----Stored energy released
• Stored energy-----small power, large time period(5MW in 6hrs)
• Released energy------large power, short time period(10MW in 3hrs)

19. • As mentioned before, it is necessary to produce the almost
exact amount of electricity that is demanded by customers.
• In order to maintain grid stability, a frequency of 50 or 60
hertz (Hz) (depending on the country’s standard) must be
generated.
• Higher deviations (± 2.5 Hz) will result in causing damage to
the generators.
• The curve progression varies over the day; but, behavior is
usually steady and pretty well known for each day and is used
as a road map for production along general lines.
• For example, the need for electricity during the night is low
whereas at noon, when everybody starts cooking, it is at its
peak.

21. •Base Load:
•This is the amount of electricity that is demanded and
produced at any time.
•Nuclear, hydroelectric power or brown coal plants are
known and common to use as base load plants due to the
long startup time and/or the low operating and fuel costs.
• Intermediate Load:
•Power plants that are easier and faster to regulate are
used for the task of middle load.
•These plants are capable of working within minutes to an
hour and have moderate operating costs.
•Black coal or wind plants are typical of middle loads.

22. •Peak Load:
•Peak load is the power demand outside of the daily
“road map.”
•Different events like unexpected hot and sunny days
can lead to an extended use of air conditioners and
therefore a higher electricity demand.
•Peak load plants have a fast response time, which
means they’re operational within seconds to a few
minutes.
•A typical example would be gas turbine power plants
or pumped-storage hydroelectricity