IEEE Electrification Magazine - March 2016 - 42
■
■
■
■
Efficiency Versus Power Split and
Voltage Ratio
Since BPC reduces
the switching
frequency, the
switching losses
are also reduced,
resulting in
higher efficiency.
the ability to provide power for a
variety of loads, including communications, computers, lighting, environmental-control systems, export power, and mission equipment
environmental conditions of
combat and noncombat operations, maintenance, transport,
and storage
temperature cycling and
extremes
EMC requirements.
Generator Operation and Control
The dual-voltage generator has two sets of three-phase
windings (Figure 12), one for low voltage (LV) and the other
for HV. The two winding sets are installed spatially shifted
by a certain angle, and results from the literature (Sulligoi
et al., 2010; Fuchs and Rosenberg, 1974) indicate a relative
displacement of 30° electrical is appropriate to mitigate
ripple and harmonic effects.
To provide a relative assessment of
power electronics efficiency, estimates of the LV generator controller
losses [equivalent series resistance
(ESR) or effective series resistance
loss in filter capacitors, conduction
and switching losses in IGBTs, and
resistive losses in bus bars] were
done for the aforementioned combinations of power level and generator
output voltage.
In general, total losses were found
to be proportional to the amount of output power, resulting in nearly constant efficiencies for a given generator
output voltage level across the range of power levels
considered. Conduction losses in IGBTs contributed to
the largest portion of the total losses, followed by bus
bar dissipation, and capacitor ESR losses, respectively.
To provide a relative assessment of the efficiency of the
HV generator power electronics, losses were estimated for
(a)
(A)
iA
VA
ia
Va
120°
0°
12
Vb
(C)
iC
ib
VC
(b)
VB
Vc
ic
(c)
iB
(B)
Machine
QU+
QV+
QW+
QZ+
QY+
QX+
+
Vhigh
-
QU-
QV-
QW-
QZ-
Figure 12. The three-phase winding structure and schematic for the dual-voltage generator system.
42
I E E E E l e c t r i f i cati o n M agaz ine / March 2016
QY-
QX-
Vlow
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