
3-16 Power Electronics and Motor Drives
It is again assumed that the phase number is an odd number and neutral point is isolated, so that zero
s
equence
c
annot
b
e
e
xcited.
I
t
i
s
t
herefore
n
ot
i
ncluded
h
ere,
b
ut
i
t
i
n
g
eneral
r
emains
to
b
e
g
overned
w
ith the corresponding penultimate row of the decoupling transformation matrix (3.12).
Since
r
otational
t
ransformation
i
s
a
pplied
o
nly
to
α−β
c
omponents,
t
hen
o
nly
t
he
c
orresponding
α−β
s
pace
v
ector
w
ill
u
ndergo
a
f
urther
t
ransformation,
g
overned
w
ith
(
3.19)
i
n
r
eal
f
orm.
O
f
c
ourse,
t
he
t
ransformation
i
s
o
nce
m
ore
d
ierent
f
or
s
tator
a
nd
r
otor
q
uantities.
e
s
tator
a
nd
r
otor
v
oltage,
c
urrent,
a
nd