IEEE Power & Energy Magazine - September/October 2017 - 73

Installing Battery Storage Technologies
to Boost Delivery of Flexibility in
Hydrothermal Power Systems

plants in case A has been allocated to battery storage plants; as
shown in Figure 4, this clearly improves the overall frequency
response of the system.
The location of balancing services will be critical in the
future power system. This is particularly problematic in a
country like Chile, where hydropower resources (traditionally used to balance the system) are located in the south and
the need for balancing will be mainly located in the north due
to the development of solar power generation. Nevertheless,
this will increase the value of a cooptimized portfolio of flexible storage technologies.
This locational issue can be combined with another fundamental difference between hydropower and battery storage

Battery storage plants can complement hydropower generation capacity because they are not subject to the same technoenvironmental development and operational constraints (as hydropower generation) and can deliver further services that are also
needed in today's power system. For instance, battery storage
plants can be located (through a simpler environmental permit
process) at basically any substation in the network that supports
provision of local services associated with congestion management, voltage control, minimization of re-newables curtailment,
and so forth. Like hydropower plants, battery storage plants can
provide system balancing services.
However, battery storage plants
are capable of improved and faster
frequency response, which can be
More
Lower Global
Higher Local
critical in situations marked by lack
Flexibility
Impacts
Impacts
of inertia (i.e., high renewables out* Lower Curtailment
* Hydro-Peaking
* Conflicts with
of Renewables
Capability
Further Activities
put) in the absence of thermal gen* Seasonal and
* Decrease in
* Impacts to Local
erating units (which can respond
Emissions
Intraday Stored
Ecosystems
more rapidly to changes in system
Water Management
frequency). Figure 4 illustrates the
benefits of installing battery storGlobal
age plants in a hydrothermal sysImpacts
tem like the Chilean one in terms of
Local
Impacts
frequency response, where cases A
and B represent the same volume of
scheduled reserves (i.e., 400 MW)
but distributed among different
technologies. In fact, in case B, part figure 3. The global and local environmental impacts dilemma associated with
of the reserve held by hydropower hydropower plant operation.

50.0

1.0

49.8

0.9

Power (p.u.)

Frequency (Hz)

Generation Response by Technology in Case B
1.1

Frequency Excursion after Contingency

50.2

49.6
49.4
49.2
49.0

0.8
0.7
0.6

0

5

10

15 20 25
Time (s)

30

35

Case A: Reserve Provided by
Hydro and Thermal Power Plants
Case B: Reserve Provided by
Battery, Hydro, and Thermal
Power Plants
(a)

40

0.5

0

5

10

15 20 25
Time (s)

30

35

40

Battery Storage Plants
Thermal Power Plants
Hydropower Plants
(b)

figure 4. The (a) frequency excursion and (b) generation response after a generation outage occurs in the Chilean power system.
september/october 2017	

ieee power & energy magazine 	

73



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - September/October 2017

IEEE Power & Energy Magazine - September/October 2017 - Cover1
IEEE Power & Energy Magazine - September/October 2017 - Cover2
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IEEE Power & Energy Magazine - September/October 2017 - Cover3
IEEE Power & Energy Magazine - September/October 2017 - Cover4
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