IEEE Electrification Magazine - June 2015 - 10
TeCHnOLOGY LeADeRS
Radar Power Demand
Source Power
Solid-State Laser Power Demand
Combined Load Power Demand
Electronic Countermeasures Power Demand
Generating Capacity per Long Ton (kW/LT)
Figure 10. Notional sensor and weapon load profiles.
1.4
1.2
1
0.8
0.6
0.4
0.2
0
1900
1920
1940
1960
1980
Year of Commissioning
2000
2020
Figure 11. Destroyer electric plant fraction versus time.
In terrestrial power systems language, a ship is considered to be an
islanded microgrid. If we compare
the load profiles for some of these
sensor and weapon systems to
renewable energy sources like wind
and solar, the similarities become
obvious. Thus, the efforts in controls
and energy storage technologies
already underway to integrate
10
I E E E E l e c t r i f i cati o n M agaz ine / j un e 2015
renewable energy into the power grid
are equally applicable to shipboard
power systems.
So what do these challenges portend for the future of electrical technologies aboard ships? As the mutual
fund companies say, "Past performance is no guarantee of future
results." However, in this case, looking at past performance can be
particularly instructive. For example,
Figure 11, which shows the fraction
of a warship taken up by an electric
plant versus time, clearly indicates
that the portion of a warship's displacement taken up by electrical
generating equipment has grown significantly over the past century, and
new weapons will only accelerate
this trend. Consequently, there is a
lot of attention focused on improving
power density for power and propulsion systems to allow a greater fraction of the ship to be allocated to
tooth versus tail. A few of the technologies that show promise for
improving power density include
wide-bandgap power electronics
superconducting components
large-format energy storage (i.e.,
batteries, capacitors, and flywheels)
advanced control concepts
efficiency improvements (energy
recovery, alternative prime movers, etc.)
cybersecurity
alternative architectures.
In the commercial ship sector, the
focus will continue to be on affordability, fuel economy, and meeting the
emissions regulations. While many
parts of the commercial marine
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