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l
oa
t
i
n
g s
o
u
r
c
e
(
FS
-
M
L
I) i
n
[
21]
us
i
n
g t
w
o
l
e
gs
.
T
hi
s
t
e
c
h
ni
q
ue
ha
s
t
he
a
d
va
nt
a
ge
o
f
no
t
ut
i
l
i
z
i
n
g H
-
br
i
dg
e
t
o pr
o
du
c
e
n
e
g
a
t
iv
e
le
v
e
ls
.
B
e
s
id
e
s
,
it u
s
e
s
u
n
id
ir
e
c
tio
n
a
l s
w
itc
h
e
s
to
w
it
h
lo
w
e
r
r
a
te
s
.
T
he
s
w
i
t
c
h
i
ng
c
on
t
r
ol
m
e
t
h
od i
s
can
u
s
e
hy
br
i
d
m
odu
l
a
t
i
on
c
o
n
c
e
pt
to
f
u
r
t
h
e
r
r
e
d
u
c
e
h
a
r
m
o
n
ic
s
d
is
to
r
tio
n
.
T
h
i
s
t
ec
h
n
i
q
u
e h
as
a r
e
m
ar
k
ab
l
e
d
i
s
ad
v
an
t
a
g
e t
h
at
i
t
l
ack
s
f
o
r
m
o
d
u
l
ar
i
t
y
an
d
i
s
m
o
r
e s
u
i
t
ab
l
e f
o
r
m
ed
i
u
m
-
a
nd
l
o
w
-
v
o
lta
g
e
a
p
p
lic
a
tio
n
s
.
T
he
s
i
m
ul
a
t
i
o
n r
e
s
ul
t
s
o
f 1
1
-
le
v
e
l in
v
e
r
te
r
u
s
i
n
g
P
S
C
A
D
/
E
M
T
D
C
s
o
f
t
w
ar
e ar
e
p
r
es
en
t
ed
f
o
r
t
h
e p
u
r
p
o
s
e o
f
v
a
lid
it
y
.
2.
F
LO
A
T
IN
G
S
O
U
R
C
E TO
P
O
LO
G
Y
T
he
f
lo
a
tin
g
s
o
u
r
c
e
m
u
lti
le
v
e
l
in
v
e
r
te
r
s
(
F
S
-
M
L
I
)
c
onf
i
gu
r
a
t
i
on
wi
t
h
o
ne
l
e
g i
s
s
ho
w
n i
n
F
i
g
ur
e
1
.
I
t is
s
i
m
ila
r
to
th
e
f
l
y
i
n
g
-
ca
p
a
c
ito
r
(
F
C)
i
n
v
er
t
er
ex
cep
t
t
h
at
t
h
e cap
aci
t
o
r
s
ar
e r
ep
l
ace
d
w
i
t
h
s
ep
ar
at
e d
c
v
o
l
t
ag
e s
o
u
r
ces
.
A
s
i
t
i
s
s
h
o
w
n
i
n
t
h
e
f
i
g
u
r
e,
i
t
co
n
s
i
s
t
s
o
f
t
h
r
ee s
ep
ar
at
e d
c s
o
u
r
ces
an
d
t
h
r
ee p
ai
r
s
o
f
s
w
itc
h
in
g
d
e
v
ic
e
s
(S
A1
, S
’
A1
),
(S
A2
, S
’
A2
),
a
n
d
(S
A3
, S
’
A3
)
.
T
h
es
e s
w
i
t
ch
i
n
g
d
ev
i
ce
s
ar
e u
n
i
d
i
r
ect
i
o
n
al
an
d
each
o
n
e o
f
t
h
e
m
co
n
s
i
s
t
s
o
f
I
G
B
T
a
nd
a
n a
nt
i
-
p
a
r
a
lle
l d
io
d
e
.
T
he
s
w
i
t
c
he
s
(S
A3
,
S’
A3
)
m
us
t
no
t
t
ur
n o
n
s
i
m
ul
t
a
ne
o
u
s
l
y o
r
t
he
y
w
i
l
l
s
h
o
r
t
-
ci
r
cu
i
t
t
h
e
s
o
u
r
ce
V
A3
.
W
h
en
t
h
e
v
o
l
t
ag
e
r
at
i
o
o
f
t
h
e
d
c
s
o
u
r
ces
V
A1
: V
A2
:
V
A3
i
s
3 :
2 :
1,
t
h
e
ou
t
put
vol
t
a
g
e
of
t
h
e
i
nv
e
r
t
e
r
f
or
e
a
c
h ph
a
s
e
,
v
o
,
i
s
f
o
ur
l
e
ve
l
s
.
T
he
ge
ne
r
a
l
f
o
r
m
o
f
t
he
FS
-
M
L
I
s
h
oul
d h
a
v
e
t
h
e
f
ol
l
ow
i
ng
e
x
pr
e
s
s
i
on
s
:
ℎ
=
2
(1
)
=
+
1
(2
)
F
i
g
ur
e
1
.
T
hr
e
e
-
c
e
lls
f
lo
a
ti
n
g
s
o
u
r
c
e
m
u
ltile
v
e
l i
n
v
e
r
te
r
s
(
F
S
-
M
L
I
)
3.
P
R
O
P
O
S
ED
S
W
IT
C
H
I
N
G
S
C
H
EM
E
I
n
t
h
i
s
pa
pe
r
,
t
h
e
pr
opos
e
d
s
w
i
t
c
h
i
ng
t
e
c
hn
i
qu
e
i
s
a
n
a
l
y
z
e
d
on
11
-
le
v
e
l
M
L
I
a
nd
t
he
n
o
n
n
-
l
e
ve
l
M
L
I
s
.
3.
1.
11
-
le
v
e
l F
S
-
M
L
I
C
on
f
i
gu
r
at
i
on
I
n
t
h
e p
r
o
p
o
s
ed
s
w
i
t
ch
i
n
g
s
c
h
e
m
e,
t
h
e n
e
g
at
i
v
e p
ar
t
m
u
s
t
b
e g
en
er
at
ed
u
s
i
n
g
t
h
e s
t
r
u
ct
u
r
e o
f
t
h
e F
S
-
M
L
I
w
i
t
h
n
o H
-
br
i
dg
e
.
T
h
e
r
e
f
or
e
,
t
h
e
pr
opos
e
d s
w
i
t
c
hi
ng
s
c
h
e
m
e
i
s
de
s
i
g
n
e
d
t
o
w
or
k
o
n
t
w
o l
e
gs
of
t
h
e
F
S
-
M
L
I
i
ns
t
e
a
d of
on
e
.
11
-
le
v
e
l F
S
-
M
L
I
wi
t
h
t
wo
l
e
g
s
i
s
s
ho
w
n
i
n
F
i
g
ur
e
2
.
T
h
e
le
g
o
n
th
e
le
f
t s
id
e
is
n
o
te
d
a
s
l
eg
A
an
d
t
h
e l
eg
o
n
t
h
e r
i
g
h
t
s
i
d
e i
s
n
o
t
ed
as
l
e
g
B
.
E
ach
l
eg
co
n
s
i
s
t
s
o
f
t
h
r
ee d
c s
o
u
r
ce
s
an
d
s
i
x
s
w
i
t
ch
i
n
g
d
ev
i
ces
.
T
h
e i
n
n
er
d
c s
o
u
r
ces
V
A3
a
nd
V
B3
m
a
y ge
t
s
ho
r
t
-
ci
r
cu
i
t
ed
acci
d
en
t
l
y
w
h
en
(S
A3
, S
’
A3
)
a
nd
(S
B
3
,
S’
B
3
)
,
r
es
p
ect
i
v
el
y
,
t
u
r
n
o
n
s
i
m
u
l
t
an
eo
u
s
l
y
.
T
h
e v
o
l
t
a
g
e r
at
i
o
o
f
t
h
e d
c s
o
u
r
ces
V
A
1
:
V
A
2
:
V
A
3
a
nd
V
B
1
:
V
B
2
:
V
B
3
m
us
t
be
5
:
3
:
1
.
T
h
is
r
a
tio
is
a
m
a
n
d
a
te
to
g
e
n
e
r
a
te
m
o
r
e
le
v
e
ls
a
t
t
h
e
o
u
tp
u
t
lin
e
v
o
lta
g
e
.
T
ab
l
e
1
p
r
es
en
t
s
t
h
e
s
w
i
t
ch
i
n
g
s
t
at
es
t
o
p
r
o
d
u
ce 1
1
-
le
v
e
l
lin
e
v
o
lta
g
e
s
a
t t
h
e
o
u
tp
u
t
o
f
th
e
i
nve
r
t
e
r
.
T
hi
s
s
w
i
t
c
hi
n
g
s
ch
e
m
e
h
as
t
h
e ad
v
an
t
ag
e
t
h
at
al
l
t
h
e v
o
l
t
a
g
es
o
f
t
h
e d
c
s
o
u
r
ces
b
u
i
l
d
u
p
co
r
e b
l
o
c
k
s
s
i
m
il
a
r
to
th
e
s
in
u
s
o
id
a
l
Evaluation Warning : The document was created with Spire.PDF for Python.
IJ
E
C
E
I
S
S
N
:
2088
-
8708
A
M
odul
at
i
on
Sc
he
m
e
f
or
F
l
o
at
i
ng S
our
c
e
M
ul
t
i
l
e
v
e
l
I
nv
e
r
t
e
r
T
opol
ogy
w
i
t
h
.
.
.
.
(
H
u
s
sa
i
n
M
.
B
a
ssi
)
1987
wa
v
e
,
F
i
g
ur
e
3
,
ex
cep
t
t
h
e i
n
n
er
d
c s
o
u
r
ce
s
,
V
A3
a
nd
V
B3
w
h
er
e t
h
e
y
ar
e u
s
ed
t
o
p
r
o
d
u
ce n
e
w
l
e
v
el
s
at
t
h
e
m
i
d of
e
a
c
h
bl
oc
k
.
I
n
ot
h
e
r
w
o
r
d
s
,
t
h
e
f
ir
s
t
bl
oc
k
h
as
t
h
e
p
er
i
o
d
b
et
w
ee
n
t
1
< T
< t
8
w
i
t
h t
he
m
a
g
ni
t
ud
e
o
f
2
pu
,
w
h
i
l
e t
h
e s
eco
n
d
bl
oc
k
h
as
t
h
e p
er
i
o
d
b
et
w
ee
n
t
3
< T
< t
6
i
s
2 pu
a
s
w
e
l
l
.
T
h
e
s
um
of
t
he
s
e
t
w
o bl
oc
ks
i
s
4
p
u
t
o
f
o
r
m
a s
t
ep
s
w
av
e t
h
at
m
i
m
i
cs
t
h
e d
es
i
r
ed
s
i
n
u
s
o
i
d
al
w
a
v
e
.
V
A3
a
nd
V
B3
ar
e u
s
ed
t
o
p
r
o
d
u
ce t
h
e l
ev
el
s
1
pu
,
3
pu
,
a
n
d
5
pu
b
y
a
ddi
n
g
a
n
d
de
du
c
t
i
ng
1
pu
(
t
h
e
m
a
gn
i
t
u
de
of
V
A3
a
nd
V
B3
)
t
o
a
nd
f
r
o
m
t
he
t
w
o
bl
oc
k
s
.
F
i
g
ur
e
2
.
11
-
l
ev
el
f
lo
a
ti
n
g
s
o
u
r
c
e
m
u
ltile
v
e
l i
n
v
e
r
te
r
s
(
F
S
-
M
L
I
)
w
i
t
h t
w
o
l
e
gs
T
ab
l
e
1
.
R
eco
m
m
en
d
ed
S
w
itc
h
C
o
m
b
i
na
t
i
o
n f
o
r
v
o
S
ta
te
O
u
t
p
u
t
ν
o
S
w
itc
h
S
ta
te
s
LE
G
-
A
LE
G
-
B
S
A1
S
A2
S
A3
S
B1
S
B2
S
B3
1
V
A1
1
1
1
0
0
0
2
V
A1
-
V
A3
1
1
0
0
0
0
3
V
A1
-
V
A3
-
V
B3
1
1
0
0
0
1
4
V
A2
0
1
1
0
0
0
5
V
A2
-
V
A3
0
1
0
0
0
0
6
V
A2
-
V
A3
-
V
B3
0
1
0
0
0
1
7
V
A3
0
0
1
0
0
0
8
0
0
0
0
0
0
0
9
-
V
B3
0
0
1
0
1
0
1
0
-
(V
B2
–
V
B3
–
V
A3
)
0
0
0
0
0
1
1
1
-
(V
B2
–
V
B3
)
0
0
0
0
1
0
1
2
-
V
B2
0
0
1
1
1
0
1
3
-
(V
B1
–
V
B3
–
V
A3
)
0
0
0
0
1
1
1
4
-
(V
B1
-
V
B3
)
0
0
0
1
1
0
1
5
-
V
B1
0
0
0
1
1
1
3.
2.
n
-
le
v
e
l F
S
-
M
L
I
C
on
f
i
gu
r
at
i
on
B
y
a
na
l
yz
i
n
g t
he
1
1
-
le
v
e
l F
S
-
M
L
I
,
a g
e
n
er
al
s
t
r
u
ct
u
r
e can
b
e d
ev
el
o
p
ed
.
F
i
gur
e
4
s
ho
w
s
t
he
n
-
c
e
ll
FS
-
M
L
I
.
T
h
e n
u
m
b
er
o
f
l
e
v
el
s
(
N
l
e
v
e
l
s
)
,
n
u
m
b
er
o
f
s
w
i
t
ch
i
n
g
d
ev
i
ces
(
N
swit
ches
),
n
u
m
b
e
r o
f d
c s
o
u
r
ces
(N
sources
)
,
an
d
t
o
t
al
s
i
ze o
f
d
c s
o
u
r
ces
i
n p
u
(T
sources
)
ar
e cal
cu
l
at
ed
a
s f
o
l
l
o
w
s:
=
2
−
1
(3
)
ℎ
=
2
(4
)
=
(5
)
=
2
∑
(
2
−
1
)
=
1
(6
)
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SSN
:
20
88
-
8708
IJ
E
C
E
V
o
l
.
6
, N
o
.
5
,
O
c
t
obe
r
2016
:
19
85
–
19
93
1988
F
i
g
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
SSN
:
20
88
-
8708
IJ
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6
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4.
CO
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[
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[
20]
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b
y
t
he
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e
a
ns
hi
p
o
f
S
c
ie
n
ti
f
ic
R
e
s
e
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r
c
h
(
D
S
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,
K
in
g
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b
d
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la
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n
iv
e
r
s
it
y
,
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e
dda
h
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u
n
de
r
g
r
a
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t
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o (
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–
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–
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h
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t
h
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,
t
h
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ack
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o
w
l
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g
e
w
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t
h
an
k
D
S
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ech
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nc
i
a
l
s
up
p
o
r
t
.
R
EF
ER
EN
C
ES
[
1]
Z
. J
i
n
g
,
e
t a
l.
,
“
N
ov
e
l
P
W
M
C
ont
r
ol
M
e
t
ho
d f
or
H
y
br
i
d
-
C
l
a
mp
e
d
M
u
lti
le
v
e
l I
n
v
e
r
te
r
s
,
”
I
E
E
E
T
r
ans
ac
t
i
ons
o
n
I
n
d
u
s
tr
ia
l Ele
c
tr
o
n
ic
s
,
vo
l
/
i
ssu
e
:
75
(
7
)
,
pp.
2
36
5
-
2
37
3,
20
10.
[
2]
S
.
C
ha
ndr
a
s
e
k
ha
r
,
e
t a
l.
,
“
M
it
ig
a
tio
n
o
f
V
o
lta
g
e
F
lic
k
e
r
a
n
d
R
e
d
u
c
ti
o
n
in
T
H
D
b
y
u
s
in
g
S
T
A
T
C
O
M
,
”
I
nt
e
r
nat
i
o
nal
J
our
n
al
of
E
l
e
c
t
r
i
c
al
an
d C
om
pu
t
e
r
E
n
gi
ne
e
r
i
n
g (
I
J
E
C
E
)
,
vo
l
/
i
ssu
e
:
3
(
1
)
,
pp
.
1
02
-
1
08
,
20
13.
[
3]
G
. F
. R
e
e
d
,
e
t a
l.
,
“
A
n
al
y
s
i
s
o
f
h
i
g
h
cap
aci
t
y
p
o
w
er
el
ect
r
o
n
i
c t
ech
n
o
l
o
g
i
es
f
o
r
i
n
t
eg
r
at
i
o
n
o
f
g
r
een
en
er
g
y
m
an
ag
e
m
en
t
,
” e
m
I
E
E
E
P
E
S
T
&
D
2
0
1
0
,
Ne
w
Or
l
e
a
ns
,
L
A
,
U
S
A
,
20
10.
[
4]
Y.
Hi
n
a
g
o
an
d
H
.
K
o
iz
u
m
i,
“
A
S
in
g
le
-
P
h
as
e M
u
l
t
i
l
ev
el
I
n
v
er
t
er
U
s
i
n
g
S
w
i
t
ch
ed
S
er
i
es
/
P
ar
al
l
el
D
C
V
o
l
t
ag
e
S
o
u
r
ces
,
”
I
E
E
E
T
r
a
ns
ac
t
i
o
ns
on
I
ndus
t
r
i
al
E
l
e
c
t
r
oni
c
s
,
vo
l
/
i
ssu
e
:
57
(
8
)
,
p
p.
26
43
-
26
50,
2
01
0.
[
5]
T.
T
. S
o
n
g
,
e
t a
l.
,
“
M
o
d
e
l
i
n
g a
nd A
n
a
l
y
si
s o
f
a
Hi
g
h
-
V
o
l
t
ag
e D
C
-
D
C Co
n
v
e
rt
e
r w
i
t
h
V
i
n
/
3
-
V
o
l
t
ag
e S
t
r
es
s
o
n
t
h
e
P
r
i
m
ar
y
'
s
S
w
i
t
ch
es
,
”
e
m
A
P
E
C
0
7
-
T
w
en
t
y
-
Se
c
o
nd A
nn
ual
I
E
E
E
A
ppl
i
e
d P
ow
e
r
E
l
e
c
t
r
oni
c
s
C
onf
e
r
e
nc
e
an
d
E
x
pos
i
t
i
on
,
A
na
he
i
m
,
C
A
,
U
S
A
,
200
7.
[
6]
T
. T
. S
o
n
g
,
e
t a
l.
,
“
A H
i
g
h
-
V
o
lta
g
e
ZV
ZC
S
D
C
--
D
C
C
o
n
v
er
t
er
W
i
t
h
L
o
w
V
o
l
t
ag
e S
t
r
es
s
,
”
I
E
E
E
T
r
ans
ac
t
i
ons
on
P
o
w
er
E
l
ect
r
o
n
i
cs
,
vo
l
/
i
ssu
e
:
23
(
6
)
,
pp.
2
630
-
2
64
7,
200
8.
[
7]
G
. P
. A
d
a
m
,
e
t a
l.
,
“C
ap
aci
t
o
r
B
al
an
ce I
s
s
u
es
o
f
t
h
e D
i
o
d
e
-
C
l
a
m
p
ed
M
u
l
t
i
l
ev
el
I
n
v
er
t
er
O
p
er
at
ed
i
n
a Q
u
as
i
T
w
o
-
S
t
at
e M
o
d
e,
”
I
E
E
E
T
r
a
n
s
a
c
t
i
o
ns
on I
nd
us
t
r
i
al
E
l
e
c
t
r
oni
c
s
,
vo
l
/
i
ssu
e
:
55
(
8
)
,
pp.
3
08
8
-
3
09
9,
20
08.
[
8]
S
.
D
ah
er
,
e
t a
l.
,
“
M
u
ltile
v
e
l I
n
v
e
r
te
r
T
o
p
o
lo
g
ie
s
f
o
r
S
ta
n
d
-
A
l
o
n
e P
V
S
y
s
t
e
m
s
,
”
T
r
ans
ac
t
i
ons
on I
nd
us
t
r
i
a
l
E
l
ect
r
o
n
i
cs
,
vo
l
/is
s
u
e
:
55
(
7
)
,
p
p.
270
3
-
27
12,
20
08
.
[
9]
L
.
G
.
F
r
a
nque
l
o,
e
t a
l.
,
“T
h
e ag
e o
f
m
u
l
t
i
l
ev
el
co
n
v
er
t
er
s
ar
r
i
v
e
s
,
”
I
E
E
E
I
n
dus
t
r
i
al
E
l
e
c
t
r
o
ni
c
s
M
ag
az
i
ne
,
vo
l
/
i
ssu
e
:
2
(
2
)
,
p
p.
28
-
39,
2
00
8.
[
1
0]
J.
Hu
a
n
g
an
d
K
.
A
.
C
o
r
zi
n
e,
“E
x
t
en
d
ed
o
p
er
at
i
o
n
o
f
f
l
y
i
n
g
cap
aci
t
o
r
m
u
l
t
i
l
ev
el
i
n
v
er
t
er
s
,
”
I
E
E
E
T
r
ans
ac
t
i
ons
o
n
P
o
w
er
E
l
ect
r
o
n
i
cs
,
vo
l
/is
s
u
e:
21
(
1
)
,
pp.
1
40
-
14
7,
20
06.
[
1
1]
C
.
R
ech
an
d
J
.
R
.
P
i
nhe
i
r
o,
“
H
y
br
i
d M
ul
t
i
l
e
v
e
l
C
onv
e
r
t
e
r
s
:
U
ni
f
i
e
d A
na
l
y
s
i
s
a
nd D
e
s
i
g
n C
ons
i
de
r
a
t
i
ons
,
”
I
E
EE
T
r
ans
ac
t
i
ons
on
I
n
dus
t
r
i
al
E
l
e
c
t
r
oni
c
s
,
vo
l
/
i
ssu
e
:
54
(
2
)
,
p
p.
10
92
-
110
4,
20
07
.
[
1
2]
R
. G
u
p
t
a
,
e
t a
l.
,
“S
w
i
t
ch
i
n
g
C
h
ar
act
er
i
zat
i
o
n
o
f
C
as
cad
ed
M
u
l
t
i
l
ev
el
-
I
n
v
er
t
er
-
C
o
n
tr
o
lle
d
S
y
s
te
m
s
,
”
I
E
E
E
T
r
ans
ac
t
i
ons
on
I
n
dus
t
r
i
al
E
l
e
c
t
r
oni
c
s
,
vo
l
/
i
ssu
e
:
55
(
3
)
,
p
p.
10
47
-
105
8,
20
08
.
[
1
3]
S
.
Da
sa
m
an
d
B
.
V
.
S
an
k
er
r
am
,
“V
o
l
t
ag
e B
al
an
ci
n
g
C
o
n
t
r
o
l
S
t
r
at
eg
y
i
n
C
o
n
v
er
t
er
S
y
s
t
e
m
f
o
r
T
h
r
ee
-
L
ev
el
In
v
e
rt
e
rs
,
”
I
nt
e
r
nat
i
on
al
J
o
ur
n
al
of
E
l
e
c
t
r
i
c
al
an
d C
om
pu
t
e
r
E
n
gi
n
e
e
r
i
ng (
I
J
E
C
E
)
,
vo
l
/
i
ssu
e
:
3
(
1
)
, p
p
.
7
-
1
4,
201
3.
Evaluation Warning : The document was created with Spire.PDF for Python.
IJ
E
C
E
I
S
S
N
:
2088
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A
M
odul
at
i
on
Sc
he
m
e
f
or
F
l
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our
c
e
M
ul
t
i
l
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v
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l
I
nv
e
r
t
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r
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opol
ogy
w
i
t
h
.
.
.
.
(
H
u
s
sa
i
n
M
.
B
a
ssi
)
1993
[
1
4]
H
.
M
.
B
as
s
i
,
“O
p
t
i
m
i
zed
c
ar
r
i
er
-
ba
s
e
d pul
s
e
w
i
dt
h m
odul
a
t
i
o
n t
e
c
hni
q
ue
w
i
t
h dou
bl
e
s
w
i
t
c
hi
ng
f
r
e
que
nc
i
e
s
f
or
t
h
r
ee
-
p
h
as
e i
n
v
er
t
er
s
,
” e
m
P
ow
e
r
E
ngi
ne
e
r
i
ng C
o
nf
e
r
e
nc
e
(
U
P
E
C
)
,
20
15 5
0t
h I
nt
e
r
na
t
i
o
nal
U
ni
v
e
r
s
i
t
i
e
s
,
S
t
o
ke
o
n
T
r
e
nt
,
20
15
.
[
1
5]
A
.
V
al
d
er
r
ab
an
o
-
G
o
n
zal
ez,
e
t a
l.
,
“
I
m
pl
e
m
e
nt
a
t
i
on of
a
84
-
pu
l
s
e
vo
l
t
a
ge
-
s
o
u
r
ce co
n
v
er
t
er
f
o
r
s
p
eci
a
l
ap
p
l
i
cat
i
o
n
s
,
”
I
E
T
P
o
w
er
E
l
ect
r
o
n
i
cs
,
vo
l
/
i
ssu
e
:
5
(
7
)
, p
p.
98
4
-
99
0,
20
12
.
[
1
6]
R
.
R
a
b
in
o
v
ic
i,
e
t a
l.
,
“T
h
i
r
t
een
-
l
ev
el
c
as
c
ad
ed
H
-
br
i
dg
e
i
nv
e
r
t
e
r
ope
r
a
t
e
d by
ge
ne
r
i
c
pha
s
e
s
hi
f
t
e
d,
”
IE
T
P
o
we
r
E
l
ect
r
o
n
i
cs
,
vo
l
/is
s
u
e
:
6
(
8
)
,
pp.
1
516
-
15
29,
20
13
.
[
1
7]
X
. Y
u
a
n
an
d
I
.
B
ar
b
i
,
“F
u
n
d
am
e
n
t
al
s
o
f
a n
ew
d
i
o
d
e cl
am
p
i
n
g
m
u
l
t
i
l
ev
el
i
n
v
er
t
er
,
”
I
E
E
E
T
r
ans
ac
t
i
ons
o
n P
ow
e
r
E
l
ect
r
o
n
i
cs
,
vo
l
/is
s
u
e
:
15
(
4
)
,
p
p.
711
-
71
8,
2
00
0.
[
1
8]
B
.
P
.
M
cG
r
at
h
an
d
D
.
G
.
H
o
l
m
es
,
“
A
n
al
y
t
i
cal
D
et
er
m
i
n
at
i
o
n
o
f
t
h
e C
ap
aci
t
o
r
V
o
l
t
ag
e B
al
an
ci
n
g
D
y
n
a
m
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c
s
f
o
r
Th
r
e
e
-
P
h
as
e F
l
y
i
n
g
C
ap
aci
t
o
r
C
o
n
v
er
t
er
s
,
”
I
E
E
E
T
r
ans
ac
t
i
o
ns
o
n
I
ndus
t
r
y
A
ppl
i
c
at
i
ons
,
vo
l
/
i
ssu
e
:
45
(
4
)
,
p
p.
14
25
-
143
3,
20
09
.
[
1
9]
W
.
K
.
C
hoi
a
n
d
F.
S
.
K
an
g
,
“H
-
b
r
id
g
e
b
a
s
e
d
m
u
ltile
v
e
l in
v
e
r
te
r
u
s
in
g
P
W
M
s
w
itc
h
in
g
f
u
n
c
tio
n
,
”
e
m
INT
E
L
E
C
200
9
-
3
1s
t
I
nt
e
r
n
at
i
on
al
T
e
l
e
c
o
m
m
uni
c
at
i
ons
E
ne
r
gy
C
onf
e
r
e
nc
e
,
I
nc
he
o
n,
20
09
.
[
2
0]
E
.
B
ab
aei
,
“A
C
as
cad
e M
u
l
t
i
l
ev
el
C
o
n
v
er
t
er
T
o
p
o
l
o
g
y
W
i
t
h
R
ed
u
ced
N
u
m
b
er
o
f
S
w
i
t
ch
es
,
”
I
E
E
E
T
r
ans
ac
t
i
ons
o
n
P
o
w
er
E
l
ect
r
o
n
i
cs
,
vo
l
/
i
ssu
e
:
23
(
6
)
,
pp.
2
657
-
26
64,
20
08
.
[
2
1]
Y
.
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E
-
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:
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au
.
ed
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a
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