
33-6 Power Electronics and Motor Drives
complex power ow strategy is needed, in order to measure the amount of power required, and when it
i
s
r
equired.
R
ecent
l
iterature
s
hows
e
xhaustive
s
tudies
b
eing
c
onducted
o
n
d
esigning
i
ntelligent
p
ower
s
ystems,
i
n
o
rder
to
f
acilitate
t
he
u
sage
o
f
P
HEVs
f
or
si
multaneous
g
rid-to-vehicle
(
G2V)
a
nd
v
ehicle-
to-grid (V2G) power ows, as well as usage in UPS applications.
33.4 PHEV Efficiency Considerations
The overall efficiency analysis of PHEVs can be categorized into two parts: well-to-tank (WTT)
e
fficiency
a
nd
t
ank-to-wheels
(
TTW)
e
ciency
(
also
c
alled
d
rivetrain
e
ciency).
C
ollectively,
t
he
W
TT
a
nd
T