
16-36 Power Electronics and Motor Drives
Hence, to further reduction of the DC-link lter, the device losses should be made independent of
s
witching
f
requency.
I
t
c
an
b
e
r
ealized
b
y
t
he
u
se
o
f
s
o-switched
V
SC
s
uch
a
s
t
he
r
esonant
D
C-link
c
onverter.
From
F
igure
1
6.30,
i
t
c
an
b
e
c
oncluded
t
hat
f
or
i
deal
c
ontrol
m
ethods,
w
ith
s
uciently
h
igh
s
ampling
t
ime,
t
he
D
C-link
v
oltage
uctuation
d
uring
t
ransient
f
or
r
educed
c
apacitor
c
an
b
e
e
ven
s
maller
(
case
w
ith
a
ctive
P
F
[
PF
C = 4
7
F
])
t
han
f
or
h
igher
v
alue
o
f
t
he
c
apacitance
(
case
w
ithout
a
ctive
P
F
[
no
P
F
C = 4
70
F
]).
M
oreover,
t
aking
i
nto
c
onsideration
o
nly
t
he
c
ases
w
ith
P
F,
i
t
c
an
b
e
seen that ...