Presentation deployment of storage & peak shaving technologies
1. Deployment of Energy Storage &
Peak-Shaving Technologies
Presented by
Vi Binh Quang Le
ELE-791 Control of Distributed Generation
Syracuse University
Spring 2017
2. Outline
Introduction
Components of energy storage systems
Benefits and challenges of energy storage technologies
Applications of energy storage including the operation, its
advantages, and disadvantages
Conclusion
Future of the energy storage technologies
References
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3. Introduction
What are Energy Storage
technologies?
• Energy storage technologies are
methods of converting AC
(alternative current) energy into
DC (directive current) energy and
storing those energy in the forms
of mechanical, chemical, or
electrical potential energy. Once
needed, the stored energy will be
converted back to AC energy
before contributing it to grid.
What is a Peak-Shaving?
• Peak-shaving or Load Leveling is a
strategy used to store power
during periods of low energy
demand and to deploy that stored
power during periods of high
energy demand with an ultimate
goal of increase the load factor.
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4. Introduction (Cont.)
Peak-shaving benefits
• Commercial and industrial
customers reduce their
energy charges by improving
their load factor
• Utilities reduce the
operational cost of
generating power during
peak periods
• Investment in infrastructure
is delayed due to having
flatter loads with smaller
peaks
ABB Source: Peak shaving/load shifting
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5. Introduction (Cont.)
Why deployment of energy storage & peak-shaving technologies are
significant?
• The United States will need somewhere between 4 and 5 tera watt-hours
(1 𝑡𝑒𝑟𝑎 𝑤𝑎𝑡𝑡 ∙ ℎ𝑜𝑢𝑟 = 109 𝑘𝑊ℎ𝑟) of electricity annually by 2050 [1]
• To meet the goal above, a planning and implementing grid expansion is needed, but
it is also facing challenges in balancing economic and commercial viability , resiliency,
cyber-security, and impact to carbon emissions and environmental sustainability [1]
• Thus, energy storage systems (ESS) will play a significant role in solving those
challenges [1]
• ESS (Energy Storage System) can address issues with the timing, transmission, and
dispatch of electricity, while regulating the quality and reliability of the power
generated by traditional and variable sources of power
• ESS contributes to emergency preparedness
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6. Energy Storage System
Each energy storage system composes of three distinct components:
the storage medium (subsystem), the power conversion system, and
the balance of the plant
Storage Medium System
• The heart of every energy storage facility is the energy reservoir or storage
medium, which can take the form of mechanical, chemical, or electrical
potential energy [4]
• The storage medium costs vary depending on types of electrolytes, energy
density, and its structure. [4]
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7. Energy Storage System (Cont.)
Power Conversion System
• Power conversion system (PCS) acts as electrical interface between the utility
power or the customers and the storage medium system.
• PCS is used to convert the AC energy from grid into DC for storage. When
needed, the PCS will convert the stored power back into AC energy before
contributing it to the grid.
Balance of plant (BOP)
• BOP includes the facility, the equipment, the environmental controls, and the
electrical connectors between PCS (power conversion system) and the power
grid.
• BOP typically costs about 10% to 25% of the total cost for a typical storage
facility [4].
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8. Benefits/Expectations & Challenges in Deployment of Storage
Energy Technologies
Benefits/expectations [1]
Enhancing renewable penetration,
specifically to enable storage
deployment at high levels of new
renewable generation
Improving the operating
capabilities of the grid
Lowering cost and ensuring high
reliability
Being instrumental for emergency
preparedness
Challenges [1]
Cost competitive energy storage
technology
Validated reliability and safety
Equitable Regulatory Environment
Industry acceptance
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9. Benefits/Expectations & Challenges in Deployment of Storage
Energy Technologies (Cont.)
Benefits & Expectations (Cont.) [1]
Backup power
Load Leveling
Frequency regulation
Voltage support
Grid stabilization
Being available to industry and
regulators as an effective option to
resolve issues of grid resiliency and
reliability
Challenges (Cont.) [1]
Not every type of the storage
energy is suitable for all the
benefits or meet the expectations
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10. International Landscape of Grid Storage – Information in this table comes from Bloomberg New Energy Finance’s Energy Storage Market Outlook, on
June 28, 2013 , as well as the U.S. Department of Energy database
Country Storage
Targets
Projects Other Issues Technology & Applications
Italy 75 MW • 51 MW of Storage
Commissioned by 2015
• Additional 24 MW
funded
• Italy has substantial renewables capacity relative to
grid size, and the grid is currently struggling with
reliability issues; additional renewables capacity
will only exacerbate problem
• 35 MW to be Sodium-Sulfur
Batteries for long-duration
discharge
• Additional capacity is focused on
reliability issues and frequency
regulation
Japan 30 MW • Approved 30 MW of
Lithium-ion battery
installations
• Potential decommissioning of nuclear fleet
• Large installation of intermittent sources –est. 9.4
GW of solar PV installed in 2013 alone
• Several isolated grids with insufficient transmission
infrastructure during peak demand periods
• Additional capacity is focused on
reliability issues and frequency
regulation
• Recently increased regulatory
approved storage devices from 31
to 55
South Korea 154 MW • 54 MW lithium-ion
batteries
• 100 MW CAES
• Significant regulatory / performance issues with
nuclear fleet
• Reliability & UPS
Germany $260 millions
for grid storage
• $172 million already
apportioned to
announced projects
• Decommissioning entire nuclear fleet; Large (and
expanding) intermittent renewable generation
capabilities
• Over 160 energy storage pilot projects
• Awaiting information on energy storage mandates
• Hydrogen; CAES & Geological;
Frequency Regulation
Canada - • Announced 1st frequency
regulation plant
- -
UK - • 6 MW multi-use battery • Other small R&D and Demonstration projects • Battery will perform both load
shifting and frequency regulation
applications
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11. The Applications of Energy Storage
The categories of energy storage technologies covered in this
presentation include chemical, hydrogen, mechanical, thermal, and
super magnetic conducting energy storage.
The liquid fossil fuels energy storage will not be covered in this
presentation.
Each of the energy storage technologies covered in this presentation
will be focused on how it works and its pros and cons.
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12. Chemical Energy Storage
Batteries are a chemical form of energy storage. It can be defined as the energy
stored in atoms and molecules that can be released during chemical reactions [2].
Typical batteries include
• Lead-acid
• Lithium-ion
• Sodium-sulfur
• Nickel-cadmium
• Nickel-metal
• Hydride
• Sodium nickel
• Chloride
Chemical energy storage also includes fuel cells, Molten Carbonate Fuel Cells, which
are not included in this presentation.
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13. Battery Energy Storage (BES)
The primary function of battery is
to convert electrical to chemical
energy and versus.
Battery consists of multiple cells
connected either in series or in
parallel as described in the figure
on the side.
When the battery is in the charge
mode, it stores energy. When the
battery is in discharge mode, it
distributes energy to the grid.
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14. Battery Type Chemical Reaction at anodes and cathodes Unit Voltage
Lead-acid
𝑃𝑏 + 𝑆𝑂4
2−
↔ 𝑃𝑏𝑆𝑂4 + 2𝑒−
𝑃𝑏𝑂2 + 𝑆𝑂4
2−
+ 4𝐻+
+ 2𝑒−
↔ 𝑃𝑏𝑆𝑂4 + 2𝐻2 𝑂 2.0 V
Lithium-ion
𝐶 + 𝑛𝐿𝑖+
+ 𝑛𝑒−
↔ 𝐿𝑖 𝑛 𝐶
𝐿𝑖𝑋𝑋𝑂2 ↔ 𝐿𝑖1−𝑛 𝑋𝑋𝑂2 + 𝑛𝐿𝑖+ + 𝑛𝑒− 3.7 V
Sodium-sulfur
2𝑁𝑎 ↔ 2𝑁𝑎+ + 2𝑒−
𝑥𝑆 + 2𝑒− ↔ 𝑥𝑆2− ~2.08 V
Nickel-cadmium
𝐶𝑑 + 2𝑂𝐻− ↔ 𝐶𝑑 𝑂𝐻 2 + 2𝑒−
2𝑁𝑖𝑂𝑂𝐻 + 2𝐻2 𝑂 + 2𝑒− ↔ 2𝑁𝑖 𝑂𝐻 2 + 2𝑂𝐻−
1.0-
1.3 V
Nickel-metal 𝐻2 𝑂 + 𝑒−
↔
1
2𝐻2
+ 𝑂𝐻− 1.0-
Hydride 𝑁𝑖 𝑂𝐻 2 + 𝑂𝐻− ↔ 𝑁𝑖𝑂𝑂𝐻 + 𝐻2 𝑂 + 𝑒− 1.3 V
Sodium nickel 2𝑁𝑎 ↔ 2𝑁𝑎+
+ 2𝑒− ~2.58 V
Chloride 𝑁𝑖𝐶𝑙2 + 2𝑒−
↔ 𝑁𝑖 + 2𝐶𝑙−
X. Luo et al., “Overview of Current Development in Electrical Energy Storage Technologies and the Application Potential in Power System
Operation,” Applied Energy, Vol 137, January 1, 2015 pp. 511-536. http://www.sciencedirect.com/science/article/pii/S0306261914010290
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Battery Energy Storage (Cont.)
15. Battery Energy Storage (Cont.)
Pros
• Rapid response
• Serves to level energy loads
• Regulate unpredictable energy
demands
• Maintain operations during
sudden high energy demand
• Secure backup power
Cons
• Large maintenance cost
• Low cycling times
• Inability to discharge completely
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16. Hydrogen Energy Storage
Hydrogen energy storage (HES) is a two-fold process.
• First, hydrogen is commonly produced by separating the hydrogen from
oxygen atoms through water electrolysis [2].
• Second, hydrogen after electrolysis is then compressed to high pressure and
stored in high pressure containers or pipelines [2]. Hydrogen can also be
stored under low pressure but this storage requires some energy to capture
and release the fuel. Then, the hydrogen gas is converted to electricity by
using fuel cell method, which could be discussed in a separate topic.
Application of HES
• Station power
• Vehicle power
• Stand-alone power
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17. Pros and Cons of HES
Pros [2]
• High energy density (500-3000 W
h/L)
• High specific energy (800-10000
W h/kg)
• Less pollution than fossil fuel
combustion
• Scalable from 1 kW to hundreds of
MW
• Can be used for both grid
application and transportation
energy
Cons [2]
• Disposing of fuel cell may be an
environmental concern due to
toxic metals
• Costly to build infrastructure
• Infrastructure is expansive,
requiring much more than existing
pipelines and steel tank tubes for
hydrogen
• High pressure hydrogen systems
susceptible to leaks
• And many more … [2]
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18. Mechanical Energy Storage
Mechanical energy is the energy of an object due to its position or motion. For example,
• When an object is free fall from a high position h2 down to a position h1, it generates a potential
energy:
𝐸 = 𝑚 ∙ 𝑔 ∙ (ℎ2 − ℎ1)
where
m is the mass of the object
g is a gravity on earth 9.81 𝑚/𝑠2
h is the position of height
• when an object is moving at a velocity v, it generates a kinetic energy
𝐸 =
1
2
∙ 𝑚 ∙ 𝑣2
where
m is a mass of the object
v is a velocity of the object.
Mechanical energy storage (MES) is the means of stockpiling the energy until it is
needed for a demand.
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19. Mechanical Energy Storage (Cont.)
MES (Mechanical Energy Storage) has four major types [2]:
• Compressed Air Energy Storage (CAES)
• Pumped Hydroelectric Energy Storage (PHES)
• Flywheels
• Gravitational Energy Storage
In the four major types of energy storage above, the PHES will be
discussed in this presentation since it is well known that PHEW is the
only energy storage technology producing gigawatt-scale power in the
world, even though the United States has not been developed it on
the large scale since 1995 [2].
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20. Pumped Hydroelectric Energy Storage (PHES)
PHES works by taking water in a
lower-level reservoir (lake, river)
and pumping it through an
underground tunnel to a higher-
elevation reservoir. When there
is a demand for electricity, water
in the higher-elevation reservoir
is discharged to the lower
reservoir to provide an energy to
spin the turbines housed in the
power plant. This process
generates electricity.
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21. Pros and Cons of PHES
Pros
• Ability to ramp quickly while
generating
• Provides power on the gigawatt scale
• Dependent on design, PHES can
change pumping rate rapidly
• 8-15 hours of full discharge
• No operational emissions
• Mostly uses nontoxic, common, or
locally sourced materials
• “Life-cycle” greenhouse gas emissions
are low
Cons
• Capital cost is high (cost to build)
• Long construction and permitting
time
• Risk and uncertainty regarding market
conditions/structures
• Perception there are no available
sites for new development
• Potential effects to water quality and
ecosystems
• Requires significant land for flooding
• Risk of flooding and failure
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22. Thermal Energy Storage
Thermal energy is the internal energy of an object due to its kinetic energy
produced by rotational, vibrational, or translation motion of atoms and/or
molecules [2].
TES (Thermal Energy Storage) is defined by the International Renewable
Energy Agency (IRENA) as “ a technology that stocks thermal energy by
heating or cooling a storage medium so that the stored energy can be used
at a later time for heating and cooling applications and power generation.”
[2]
TES is most applied to the context of building and cooling [2]
There are two general categories for TES to provide cooling
• “Sensible” energy change
• “latent” energy change
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23. Sensible Energy Change & Latent Energy Change
Sensible energy change systems use
the heat capacity of a fluid such as
water to store thermal energy.
Latent energy change systems work
by extracting heat via a storage
medium such as ice, salt solutions, or
ethylene glycol-water mixes.
Heat storage is also available. Heat
storage is used to provide load-
leveling – holding heat in a high-heat
capacity material and then releases
that heat for use at another time.
However, heat storage is impractical
for use because it does not improve
system capacity.
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24. Pros and Cons of TES
Pros
• Reduce peak demand and energy
consumption
• Balance energy demand and supply
daily, weekly, and/or seasonally
• Minimize CO2 emission and costs
• Increase overall efficiency of energy
systems
• TES efficiency often claimed above
90%
• Minimal maintenance of TES system
required
• No technical/economical barriers
Cons
• Some fluids use are toxic or
hazardous (refrigerants even common
to industry)
• Lack of awareness of the technology
• Tools which can provide accurate and
quick systems analysis are unavailable
• Limited quantification and recovery of
benefits
• Less flexible than other electricity
storage technologies because only
providing air-conditioning
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25. Superconducting Magnetic Energy Storage
Superconducting magnetic
energy storage (SMES) is stored
in a magnetic field created by
the DC flow in a
superconducting coil [3]. The
phenomenon of conducting an
electric current without
electrical resistance is known as
superconductivity [2].
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26. Superconducting Magnetic Energy Storage (Cont.)
How does SMES work?
• The power conditioning system is
responsible for transforming AC
coming from the electric grid to DC
for charging (storing). When there is
a demand for energy, the SMES
system discharges by converting DC
back to AC electricity .
• The transformer then either provides
electricity to the power system or
drops the operating voltage to a level
where the power conditioning system
can handle [1].
Applications
• Frequency regulation
• Power quality improvement
• Enhancement of transmission
• Voltage stability
• Load leveling
• Automatic generation control
• UPS (uninterruptable power
supplies)
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27. Superconducting Magnetic Energy Storage (Cont.)
Pros
• Ability to discharge large quantities of
power over a short period of time
• Fast response time in both discharge
and charge [3]
• Efficiency reaches near 95% for
charge-discharge cycle [5]
• Strong energy density
• Large power capacities [2]
• Life cycle (~20 years of continuous
operation) [2].
• No use of fuel or water
• Zero emissions
• No hazardous chemicals
Cons
• Early stages of HTS (high
temperature semiconductor)
• Cost of SMES system is high
compared with other energy
storage and increases significantly
as energy storage increases
• Challenge to restrict human
exposure to magnetic fields
• Limited to power quality
applications
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28. Conclusion
Deployment of energy storage and
peak-shaving is significantly support
the present and the future of
electricity. The relation among grid
stability, peak shaving, and the Energy
Storage can be expressed in the
diagram on the side.
Deployment of energy storage and
peak-shaving is positively effect to
economy and environment.
Every EST (energy storage technology)
has its Pros and Cons so it is applied
depending on what applications and
energy scales demand.
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Utility-scale
energy storage
will optimize grid
Peak
Shaving
Grid
stabilization
29. The Future for Deployment of Energy Storage
Technologies
Near-Term
• Demonstrate AC energy storage systems involving redox flow batteries,
sodium-based batteries, lead-carbon batteries, lithium-ion batteries and
other technologies to meet the following electric gird performance and cost
targets [1]:
o System capital cost: under $250/kWh
o Leveled cost: under $0.2 kWh/cycle
o System efficiency: over 75%
o Cycle life: more than 4000 cycles
• Develop and optimize power technologies to meet AC energy storage system
capital cost targets under $1750/kW [1]
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30. The Future for Deployment of Energy Storage
Technologies (Cont.)
Long-term
• Research and develop new technologies based on advanced materials and
chemistries to meet the following AC energy storage system targets[1]:
o System capital cost: under $150/kWh
o Level cost: under $0.1 kWh/cycle
o System efficiency : over 80%
o Cycle life: more than 5000 cycles
• Develop and optimal power technologies to meet AC energy storage system
capital cost targets under $1250 / kW [1]
• For Concentrated Solar Power (CSP)-storage systems[1]:
o System capital cost: under $15/kWh
o System efficiency: 95%
o Cycle life: 10,000 cycles
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31. Energy Storage Technologies for Current and Future
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32. References
[1] “Grid Energy Storage,” U.S. Department of Energy, Dec. 2013
[2] “Energy Storage Technologies White Paper,” Port of Long Beach
The Green Port, August 2016
[3] “Electrical Power and Energy Systems,” by Xingguo Tan, Qingmin
Li, Hui Wang, 2013
[4] “ Electricity Storage Technologies,” Copyright@ 2007 PennWell
Retrieved from www.knovel.com
[5] “ Energy Storage Technologies and Applications,” Edited by
Ahmed Faheem Zobaa, January 2013
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Editor's Notes
Hello Everyone.
I’m Vi Binh. My project is about Deployment of Energy Storage & Peak-Shaving Technologies.
I will talk about 5 points
Define the energy storage technologies and the peak-shaving.
The structure of the energy storage systems.
The benefits and challenges of this technologies.
Five major types of energy storage technologies. If I have a time, I will talk very quick about how it works and the advantages and disadvantages of each type.
The conclusion and future work of this technology.
Energy storage technologies are any methods used to convert AC energy into the DC energy and store it in the form of either mechanical, chemical, electrical, or thermal energy, etc. When needed, those stored energy will be
converted back to AC before sending it to grid distribution.
The peak-shaving is also known as load leveling, which is a strategy used to store power during the time of low energy demand, and then deploy that stored power during the time of high energy demand.
About this graph, the graph was derived from ABB Source.
The horizontal of the graph represent for the time in a day
The vertical of the graph represents for power in kilowatts
The yellow line is the power that the grid can provide us
The dark blue line is the peak power demanded by users at the time shown on the horizontal line
The pink results in the batteries and can discharge the energy into the grid. In this particular case, the saved energy in the pink can cover the difference between the dard blue and the yellow.
. The United States will need between 4 to 5 tera watt-hours by 2050. To meet this goal, we need to expand the grid network but it faces many challenges in economic and commercial viability, cyber-security , and the environment.
Therefore, ESS (energy storage system) plays significant role.
In my research shows that the principle of the energy storage system consists of three components:
Storage Medium System, which is the heart of every energy storage facility
The power conversion system, which is an interface between utility power and the storage medium system
The balance of plant
Energy density means high-density storage media allow for smaller supporting equipment, whereas lower-density material requires a large storage facility.
Electrolytes is a nonmetal electrical conductor
Structure consists of two components: the initial capital cost of the medium itself and the costs to maintain the storage medium
The next component is Power Conversion System. This component works like an interface between the utility power and the storage medium system
The last component is called Balance of plant. This includes the facility, the equipment, the environmental controls, and electrical connectors between the power conversion systems and the power grid.
The converter acts as rectifier when the storage system is being charged – changing AC to DC.
When the storage system discharges, the process reverses and the converter operates as an inverter – change DC to AC.
The benefits of ESS: support the grid, backup power, load leveling, frequency regulation, voltage support, ect.
However, the main challenges are
Cost: pay attention on the capital cost ( expense to built) and the cost to maintenance
Validated reliability and safety:
Equipment are not available in the market
Industry acceptance (example, solar energy is still not used by many customers)
(Definitions:
Backup power: the stored power during low demand periods will be used
Load leveling: strategy that stores power during periods of low energy demand and deploys that stored power during periods of high energy demand.
Frequency regulation: the immediate response from the electricity supply within seconds to the electricity demand)
This table shows some Storage Energy projects of international countries. The data in this table was derived from Bloomberg New Energy Finance’s Energy Storage Market Outlook and the U.S. DOE (Department of Energy) database on June 28, 2013
Abbreviation:
CAES = Compressed Air Energy Storage
UPS = Uninterruptible Power Supply
UK: United Kingdom
The data from this table is used to show some major project of international countries.
The five major types of storage technologies: chemical, hydrogen, mechanical, thermal, and super magnetic conducting energy storage.
Conventional batteries are a chemical form of energy storage. It is defined as the energy stored in atoms and molecules that can be released during the chemical reactions to generate energy.
Chemical energy storage includes electrochemical, chemical energy storage, and thermochemical energy storage. The electrochemical energy storage includes conventional batteries such as lead-acid, Lithium-ion, Sodium-sulfur, Nickel-cadmium, Nickel-metal, Hydride, Sodium, Nickel, Chloride; the chemical energy storage includes fuel cells, molten carbonate fuel cells (MCFC) and Metal-Air batteries; the thermochemical energy storage includes solar hydrogen, solar metal, solar ammonia dissociation-recombination, and solar methane dissociation-recombination. In this presentation, I just include the conventional batteries.
In general, batteries are used to convert electrical to chemical energy to store that energy. When the electric energy is needed, the batteries converts the chemical energy back to electrical energy. When the batteries are in charge mode, they are storing the energy. And when the batteries are discharging, they are distributing the electrical to the grid.
This table shows some chemical reaction of the some batteries. It produces electricity when it produces electrons.
Here is some pros and cons of the batteries storage energy.
We know water molecules consists of two hydrogen atoms and one oxygen atom. So Hydrogen energy storage is a two-fold process. 1. First, hydrogen atoms are separate from oxygen atoms using the water electrolysis. The water electrolysis is a process of passing a current through the water. Second, we compress the hydrogen under high pressure and store it in a high pressure containers or pipelines. This hydrogen also can be stored under low pressure container but this storage requires some energy to capture and release fuel.
Here is the advantages and disadvantages of the HES (Hydrogen Energy Storage)
I made this slide just to remind me of what potential energy is and what kinetic energy is. So the MES is a stockpiling the energy for the future use.
Mechanical energy storage includes four major types: compressed air energy storage, pumped hydroelectric energy storage, flywheels, and gravitational energy storage. Due to time is limited, I will talk quickly about PHES – the pumped hydroelectric energy storage because this technique produce gigawatt-scale power.
PHES works by taking water in a lower-level reservoir such as lake, river, and pump the water through an underground tunnel to a high-elevation reservoir. To generate electricity when demand, we discharge the water from the high-elevation reservoir to the lower-elevation reservoir(re so qua). This potential energy will spin the turbines located in the power plant to generate electricity power.
Here are some pros and cons of this technology. (pause this slide for a few seconds to let class view it).
Thermal energy storage is called TES. TES is generated due to its kinetic energy produced by rotational, vibrational, or translation of motion of atoms and molecules. There are two common types of TES: Sensible energy change and Latent energy change.
Notes of how the diagram work:
In Sensible energy change systems use the heat capacity of a fluid such as water to store thermal energy. During this process, the fluid undergoes a temperature drop. During charging of sensible energy change systems, the water at the top of a storage tank is cooled by a chiller. After chilling, the water is returned to the bottom of the tank (cooling water is the blue area) where it provides building cooling needs when there is a demand.
When the water meets the cooling demand, it warms. During off-peak times, the water the is warm and moves back to the top of the storage tank to be cooled once again. This process is kept repeating in that manner.
How a Latent Energy Change Systems work?
When latent energy change system charge, the chiller cools a liquid to a freezing temperature (water is at zero degree Celsius). This cooled fluid then moves to the heat exchanger, which is contained in a water tank. At this heat exchanger, the water in the tank freezes while the fluid warms. The warmed fluid then returns to either be pre-chilled by the chiller or cooled through the ice storage tanks. Once the warmed water is back in the ice storage tank, the ice in the tank melts and the returning liquid cools and continues to provide climate control.
Here are some pros and cons of this technology.
Superconducting magnetic energy storage (SMES) is a process of storing energy in a magnetic field. The material with its resistance very small is called superconductivity. When a DC current flows through the superconducting coil, it generates an energy and stores that energy in a magnetic field.
Note:
The control system receives input from the grid regarding power needs as well as the condition of the supercoil, cryogenic system, and other pieces of the system. It is essentially an information hub for the SMES controller.
Fast response time in both discharge and charge: 5 milliseconds (according to the reference [3]
Efficiency reported in this presentation is near 95% but in some other reference ([3]) reports from 95% to 98%
According to a document of U.S. Department of Energy reported in 2013, for the near term, the technology is focused on capital cost, level cost (the cost for the kWhr per cycle), system efficiency, and the cycle life
For the long term, the goal is similar to the near-term but everything is decreased down to about an half. For example, system capital cost from $250 per kWh to $150 per kWh, level cost from 20 cent kWh per cycle to 10 cents kWh per cycle. Also we try to increase the life cycle from 4000 to 5000 cycles, etc.
This plot reported in 2015 by AECOM Australia Pty Ltd, this shows us what going on with the energy storage technologies. Some has been completely developed or mature such as pumped hydro storage, some others are developing such as Supercapacitor.
These are the 5 references I used for this presentation.
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Thank you very much!