IEEE Electrification Magazine - December 2013 - 33
90
10
0
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Amps
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Vcfil
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Volts
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-200
Time (ms)
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IEMS
Iload
Time (ms)
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IlsA
Time (ms)
Figure 4. A photo of the EMS laboratory setup.
Figure 6. The experimental measurements: the EMS stops providing
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Iload
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Time (ms)
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Iload
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-200
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Amps
power to the load after it connects to VsB.
Time (ms)
Time (ms)
Figure 5. The experimental measurements: the EMS provides power
Figure 7. The simulation results: the EMS provides power to the load
to the load after it disconnects from VsA.
after it disconnects from VsA.
a physics-based model of the circuit shown in figure 3
was implemented using the MaTLaB/simulink software.
The voltage sources VsA and VsB were simulated using
ideal voltage sources, while all other circuit parameters
were set to match the laboratory setup.
figures 7 and 8 present the simulation results that are
in good agreement with the simulations except for the
noise due to the nonideal voltage
source used in the laboratory. in particular, the source current waveforms
IlsA and IlsB, displayed at the bottom
of figures 5 and 6, respectively, present some ripple because the laboratory power supply voltage, unlike the
simulated one, is nonideal. The fifth
and seventh harmonics are usually
present. additionally, the thyristor
switch controlled by the eMs to connect and disconnect the source contributes to the noise observed in the
experimental waveforms.
Traditional Generator employment
Typically, on a remote military base, each generator is
directly connected to its own separate set of loads. a
notional profile representing the load demand for a 5- and
20-kw generator is depicted over a 24-h period in figure 9.
This method of generator employment will be referred to
as traditional scenario hereafter. By visual inspection, it is
clear that both the 5- and 20-kw generators run at less than 50% of their
rated maximum load throughout the
notional scenario. since a generator's
efficiency is directly proportional to
its loading, such a low generator loading, as presented in figure 9, gives
room for optimization.
The fuel flows were estimated
using each generator's capacity and
operating point. The fuel flow curves
used for the generators are shown in
figure 10. The corresponding linear
best-fit equations for these curves
Marines and soldiers
are responsible for
the transportation,
safe employment,
maintenance, and
refueling of forwarddeployed generators.
IEEE Electrific ation Magazine / d ec em be r 2 0 1 3
33
Table of Contents for the Digital Edition of IEEE Electrification Magazine - December 2013
IEEE Electrification Magazine - December 2013 - Cover1
IEEE Electrification Magazine - December 2013 - Cover2
IEEE Electrification Magazine - December 2013 - 1
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