IEEE Power & Energy Magazine - May/June 2018 - 82

An integrated wind-solar plant also
has the potential for savings in
evacuation and transmission upgrade costs.

0.2

Battery Power
Command

Avg. Event Power (MW)

Battery Power (MW)

Finally, as shown in Figure 6, the asset life is determined from the duty profile, asset type, and size by using
asset-specific calendar and cycle-life models. Combining
all calculations, project economics can be estimated based
on revenue, initial cost, and life (number of replacements
over the project life).
this analysis used a database of energy storage technologies built at ge global research for the comparison and evaluation of various energy storage assets available in today's
market. the underlying asset database includes equivalentcircuit models of over 100 energy storage assets spanning a
wide range of technologies and options. these energy storage
equivalent-circuit models were developed from a combination of data sheets and follow-up discussions with suppliers
to confirm model results.
For the primary and secondary use cases described previously, the key input for determining the charge/discharge
profile of the Bess was the simulated 15-min wind and solar
profiles and the corresponding short-term forecasts for each
phase of the project. other key model inputs include wind

0

-0.2

Time (h)

1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1

Use-Intensity
Map

0

5

10 15 20 25 30

900
800
700
600
500
400
300
200
100
0

and solar tariffs, the dsM penalty structure, and ancillary
service tariffs.
Based on the technical design and financial analysis, a
10-Mw, 15-Mwh battery lithium manganese cobalt-oxide
Bess was recommended for the phase 1-a 41-Mw integrated
wind-solar project. this Bess was designed primarily to perform the dsM penalty reduction function but, when not doing
so, could also be used for other primary and secondary applications. Bess sizing for the remaining phases of the project will
depend significantly on future energy storage-related regulations and the cost of the Bess. For each of the remaining phases
of the ananthpur and Kutch projects, the Bess ranged in size
from 10-60 Mw, with a capacity of 30-280 Mwh.

Design of the Collector System
the collector system was designed using a mixture of industry best practices for wind and PV collector systems. it
is common practice in india to use overhead conductors for
standalone wind plants and underground cables for PV solar
plants. a main consideration in the collector design was

Storage Database
and Metrics Calculator

Installed
Cost

US$

Event Duration
(min)

Damage-Intensity Map and Mode Estimated Life

107
106
105

LTO

LNCA
NoMx

104
103
102
0

LIC
Flywheel

20

40

60

80

100

Depth of
Discharge (%)

1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
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-0.8
-1
0

5

10 15 20 25

Event Duration
(min)

30

20
18
16
14
12
10
8
6
4
2
0

Project
Economics

Net Present Value

Battery Life Models
108

Avg. Even
Power (MW)

Cycles to End-of-Life

figure 5. The second phase of the energy storage value analytics methodology: installed cost.

NPV

Installed
Battery Size (MWh)

figure 6. The third phase of the energy storage value analytics methodology: asset life. NPV: net present value.
82

ieee power & energy magazine

may/june 2018



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2018

Contents
IEEE Power & Energy Magazine - May/June 2018 - Cover1
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