IEEE Power & Energy Magazine - September/October 2017 - 24
Propelled by applications ranging from portable devices to
EVs and PHEVs, Li-nickel-manganese-cobalt-oxide (LNMC)
battery technology with high voltage has been introduced to
improve energy density. LNMC batteries are increasingly
taking the place of LFP batteries in EV applications. Nevertheless, large-scale LNMC storage deployment in the electric
grid faces some challenges due to its relatively short cycle life
and high cost. It should be pointed out that Li-titanate-oxide
(LTO)-based anode materials for Li-ion batteries show great
potential because of their much longer cycle life, higher power
density, and better low-temperature tolerance compared to
LFP and LNMC batteries. LTO batteries, therefore, tend to
have a growing market share in high-power applications, such
as frequency regulation, with decreasing cost. High-energydensity Li-ion batteries, including Li-sulphur and Li-air batteries, are being actively studied, motivated by their application to EVs. They may also be suitable technologies for
next-generation utility-scale energy storage.
Li-ion batteries have been deployed to support the electric
grid, as shown in Table 3, which summarizes several battery
energy storage applications. Demonstration projects have
ranged from hundred-kilowatt-scale to tens of megawatt-scale
installations. Li-ion batteries are involved in generation, transmission, distribution, and end user support, playing a crucial
role in renewable capacity firming, load leveling, peak shaving, capital deferral, and frequency regulation. Energy storage
systems equipped with Li-ion batteries are rapidly evolving and
advancing to augment capacity scale and demonstrate suitability for a number of grid applications. Li-ion battery technologies may show cost benefits in the near future due to growing
manufacturing maturity and economies of scale. Thousands of
large-capacity battery cells are used through serial and parallel
connections, which require a high degree of cell consistency
within a battery-pack system. It remains challenging to maximize battery energy utilization in pack-level applications where
either maintenance or active balancing is imperative.
NaS Battery
The NaS battery was pioneered by the Ford Motor Company
with the goal of powering early-model electric cars in the
1960s. This technology was subsequently sold to NGK Insulators, which demonstrated utility-scale NaS battery applications
in the late 1990s. Since 2002, this type of battery has been
commercialized and has gradually grown to lead the market in
large-scale energy storage for the electric grid.
The internal structure and working principle of an NaS
battery are illustrated in Figure 3. As opposed to the batteries
discussed previously, this battery type is composed of a molten sulphur anode, a molten sodium cathode, and solid beta
alumina ceramic electrolyte. The charge and discharge cycles
have to be operated in temperatures over 300 °C, such that
sulphur and sodium exist in a molten state. External heating
table 3. Li-ion battery energy storage systems for grid applications.
24
Year of
Installation
Project Name
Location
Energy
Application Functionality
Santa Rita Jail Smart Grid
Advanced Energy Storage
System
California,
United States
32 MW/0.25 h
Microgrid with renewable generation and
large-scale energy storage, balancing load
peaks and valleys
2012
Anchorage Area Battery Energy
Storage System
Alaska,
United States
25 MW/0.6 h
Electric energy time shift, electric supply
reserve capacity spinning, load leveling,
transportable transmission/distribution,
upgrade deferral
2012
National Wind and Solar Energy
Storage and Transmission
Demonstration Project (III)
Hebei, China
3 MW/3 h
Frequency regulation, ramping, renewables
capacity firming, renewables energy time
shift
2012
Orkney Storage
Scotland,
United
Kingdom
2 MW/0.25 h
Transmission congestion relief
2013
Tehachapi Wind Energy Storage
Project-Southern California
Edison
California,
United States
8 MW/4 h
Electric supply capacity, renewables
capacity firming, transmission congestion
relief, transportable transmission/distribution
upgrade deferral, voltage support
2014
Giheung Samsung SDI Project
Gyeonggi-do,
South Korea
1 MW/10 h
Frequency regulation, transmission
congestion relief, voltage support
2015
Feldheim Regional Regulating
Power Station
Brandenburg,
Germany
1 MW/1 h
Frequency regulation, renewables capacity
firming, transmission upgrades due to wind
2015
Rabbit Hill Energy Storage
Project
Texas,
United States
1 MW/0.5 h
Electric energy time shift, frequency
regulation, renewables energy time shift
2016
ieee power & energy magazine
september/october 2017
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IEEE Power & Energy Magazine - September/October 2017 - Cover3
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