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Evaluation Warning : The document was created with Spire.PDF for Python.
I
J
A
P
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I
SS
N:
2252
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8792
A
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53
Fu
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to
-
b
ac
k
co
n
v
er
ter
w
it
h
g
en
er
ic
co
n
tr
o
ller
s
o
n
b
o
th
s
tato
r
an
d
r
o
to
r
s
id
e
is
co
n
s
id
er
ed
.
DFI
G
is
a
p
ar
tial v
ar
iab
le
s
p
ee
d
W
T
an
d
h
as d
ir
ec
t c
o
n
tact
w
it
h
g
r
id
w
ith
o
u
t a
n
y
is
o
latio
n
,
w
h
ic
h
r
es
u
lt
s
i
n
p
o
o
r
tr
an
s
ie
n
t
s
tab
ilit
y
[
6
-
1
0
]
.
No
w
co
m
i
n
g
to
T
y
p
e
-
4
W
T
,
a
f
u
l
l
y
v
ar
ia
b
le
s
p
ee
d
W
T
h
as
a
Fu
ll
-
s
ca
le
b
ac
k
-
to
-
b
ac
k
co
n
v
er
ter
w
it
h
g
e
n
er
ic
co
n
tr
o
ller
s
th
at
ca
n
a
f
f
o
r
d
g
r
ea
ter
is
o
lat
io
n
f
r
o
m
g
r
id
.
T
h
is
w
il
l
b
e
i
m
p
r
o
v
ed
b
y
u
s
i
n
g
T
y
p
e
-
4
W
GS.
Hen
ce
i
n
t
h
is
p
r
o
p
o
s
ed
s
ch
e
m
e,
T
y
p
e
-
4
W
in
d
T
u
r
b
in
e
ca
n
b
e
as
it
d
o
esn
‟
t
ta
k
e
m
u
ch
r
ea
cti
v
e
p
o
w
er
f
r
o
m
g
r
id
,
an
d
it
p
r
o
v
id
es
h
ig
h
s
p
ee
d
r
an
g
es
a
n
d
i
m
p
r
o
v
es
tr
an
s
ie
n
t
an
d
s
tead
y
s
tate
s
tab
il
it
y
o
f
t
h
e
s
y
s
te
m
.
T
h
e
m
ai
n
d
is
ad
v
a
n
ta
g
e
o
f
W
GS,
W
in
d
is
av
ailab
le
o
n
l
y
af
ter
d
u
s
k
an
d
s
o
lar
is
av
ailab
le
o
n
l
y
a
f
ter
d
a
w
n
.
So
in
ad
d
itio
n
to
W
GS,
So
lar
P
h
o
to
v
o
ltaic
g
en
er
at
in
g
s
y
s
te
m
is
al
s
o
in
te
g
r
ated
to
MG
.
Her
e
t
h
e
p
r
o
p
o
s
ed
m
o
d
el
is
VS
C
-
HVDC
S
y
s
te
m
b
ased
T
y
p
e
-
4
W
in
d
Gen
er
atio
n
S
y
s
te
m
,
w
h
ic
h
co
n
tr
o
ls
b
o
th
A
ct
iv
e
P
o
w
er
an
d
R
ea
c
tiv
e
P
o
w
er
.
V
SC
-
HVD
C
li
n
k
is
u
s
ed
tr
an
s
m
it
t
h
e
p
o
w
er
to
t
h
e
lo
n
g
d
is
ta
n
ce
ar
ea
an
d
ca
n
b
e
co
n
n
ec
ted
b
et
w
ee
n
t
w
o
a
s
y
n
ch
r
o
n
o
u
s
p
o
w
er
g
en
er
atio
n
s
y
s
te
m
s
a
n
d
ca
n
tr
an
s
f
er
p
o
w
er
in
b
o
th
t
h
e
d
ir
ec
tio
n
s
.
L
o
w
Vo
lta
g
e
R
id
e
th
r
o
u
g
h
(
L
VR
T
)
s
y
s
te
m
is
u
s
ed
to
m
ain
tain
t
h
e
lo
ad
d
em
a
n
d
co
n
s
tan
tl
y
w
h
e
n
t
h
er
e
is
a
f
a
u
lt o
n
th
e
g
r
id
s
id
e.
T
h
e
p
r
o
p
o
s
ed
m
et
h
o
d
o
f
o
p
er
atin
g
th
e
T
y
p
e
–
4
W
in
d
g
en
er
atio
n
s
y
s
te
m
o
p
er
ated
w
it
h
VS
C
b
ased
HVDC
tr
a
n
s
m
i
s
s
io
n
s
y
s
te
m
w
ill
i
n
cr
ea
s
e
th
e
s
tab
ilit
y
o
f
t
h
e
Gr
id
.
L
o
w
Vo
lta
g
e
R
id
e
-
T
h
r
o
u
g
h
(
L
VR
T
)
is
o
n
e
o
f
th
e
m
o
s
t
s
i
g
n
i
f
ica
n
t
g
r
id
co
n
n
ec
tio
n
r
eq
u
ir
e
m
en
ts
to
b
e
m
et
b
y
W
in
d
E
n
er
g
y
C
o
n
v
e
r
s
io
n
S
y
s
te
m
s
(
W
E
C
S).
W
h
en
t
h
e
v
o
lta
g
e
d
ip
o
cc
u
r
s
at
th
e
g
r
id
s
id
e,
a
n
i
m
b
alan
ce
is
m
a
d
e
b
et
w
ee
n
t
h
e
ac
ti
v
e
p
o
w
er
d
eli
v
er
ed
to
th
e
g
r
id
an
d
g
e
n
er
ated
ac
ti
v
e
p
o
w
er
.
W
h
ic
h
i
s
a
ch
alle
n
g
e
f
o
r
th
e
W
E
C
S,
h
er
e
th
e
w
in
d
g
en
er
ato
r
s
ar
e
co
n
n
ec
ted
lo
ca
l
g
r
id
u
n
d
er
h
ea
lt
h
y
a
n
d
f
a
u
lt
co
n
d
itio
n
s
.
A
cc
o
r
d
in
g
to
lo
w
v
o
ltag
e
r
id
e
th
r
o
u
g
h
(
L
V
R
T
)
,
if
an
y
v
o
lt
a
g
e
d
ip
is
o
cc
u
r
r
ed
in
th
e
w
i
n
d
g
en
er
atio
n
p
lan
t
m
u
s
t
co
n
n
e
cted
to
th
e
g
r
id
,
an
d
i
t
d
el
iv
er
s
r
ea
cti
v
e
p
o
w
er
to
t
h
e
g
r
id
to
h
o
ld
th
e
g
r
id
v
o
ltag
e
[
11
-
16
]
.
2.
WI
ND
G
E
N
E
RA
T
I
O
N
SYS
T
E
M
I
NT
E
G
R
AT
E
D
T
O
V
SC
-
H
VDC
L
I
NK
B
y
u
s
i
n
g
W
in
d
as
an
i
n
p
u
t
f
o
r
p
o
w
er
g
en
er
atio
n
,
W
in
d
t
u
r
b
i
n
es
p
la
y
a
k
e
y
r
o
le
to
d
r
i
v
e
a
n
elec
tr
ical
g
en
er
ato
r
.
B
asicall
y
W
T
co
n
s
is
ts
o
f
B
lad
es,
H
u
b
,
Nac
elle,
Gea
r
b
o
x
,
E
lectr
ical
Gen
er
ato
r
an
d
a
co
n
tr
o
l
u
n
it.
B
lad
es
ca
tch
w
i
n
d
p
o
w
er
,
w
h
ile
h
u
b
an
d
Nac
el
le
h
o
ld
s
th
e
b
lad
es.
R
o
tatin
g
b
lad
es
i
n
ac
t
io
n
m
o
v
e
t
h
e
s
h
a
f
t
in
s
id
e
Nac
e
lle.
He
n
ce
Gea
r
b
o
x
is
u
s
ed
to
in
cr
ea
s
e
th
e
s
p
ee
d
o
f
th
e
s
h
a
f
t
in
ac
co
r
d
an
ce
t
o
s
y
n
ch
r
o
n
ize
w
it
h
th
e
E
lectr
ical
g
e
n
er
ato
r
s
p
ee
d
.
E
lectr
ical
Gen
er
ato
r
an
d
C
o
n
tr
o
l
u
n
it
s
er
v
e
th
e
MG
s
id
e
p
ar
am
eter
s
.
Us
u
all
y
w
i
n
d
en
er
g
y
is
tr
ap
p
ed
,
s
u
ch
t
h
at
if
w
i
n
d
f
lo
w
s
o
v
er
b
lad
es
r
esu
lti
n
g
in
r
o
tatio
n
al
f
o
r
ce
u
s
in
g
g
e
n
er
atin
g
li
f
t.
Op
er
ated
as
p
er
th
ese
to
p
o
lo
g
ies
ar
e
ca
lled
Dr
ag
lift
b
ased
m
ac
h
in
e
s
.
T
h
e
p
o
w
er
tr
a
n
s
f
er
in
w
i
n
d
tu
r
b
in
e
i
s
n
o
th
i
n
g
b
u
t k
in
et
ic
en
er
g
y
o
f
t
h
e
f
lo
w
i
n
g
air
m
a
s
s
p
er
u
n
it ti
m
e
is
(
1
)
W
h
er
e
is
th
e
p
o
w
er
in
w
i
n
d
(
in
w
a
tts
)
ρ
is
t
h
e
air
d
en
s
it
y
(
1
.
2
2
5
k
g
/
m
3
at
1
5
°C
an
d
n
o
r
m
a
l
p
r
ess
u
r
e)
,
A
i
s
th
e
ar
ea
clea
r
e
d
in
(
s
q
u
ar
e
m
eter
)
,
an
d
is
th
e
w
i
n
d
v
elo
cit
y
w
it
h
o
u
t
r
o
to
r
in
ter
f
er
e
n
ce
,
i.e
.
,
id
ea
ll
y
at
in
f
i
n
ite
d
is
ta
n
ce
f
r
o
m
th
e
r
o
to
r
(
in
m
eter
p
er
s
ec
o
n
d
)
.
A
ct
u
all
y
th
e
E
q
u
at
io
n
s
h
o
w
s
t
h
e
p
o
w
er
i
n
th
e
w
i
n
d
,
b
u
t t
h
e
p
o
w
er
o
f
t
h
e
in
d
u
ctio
n
t
u
r
b
in
e
r
o
to
r
is
af
f
ec
ted
b
y
p
o
w
er
co
ef
f
ic
ien
t
,
C
(
2
)
(
3
)
A
lb
er
t
B
etz
d
ef
i
n
es
t
h
e
m
a
x
i
m
u
m
v
al
u
e
o
f
li
m
i
t
an
d
t
h
e
v
alu
e
o
f
t
u
r
b
in
e
ca
n
n
e
v
er
ex
ce
ed
5
9
.
3
%
o
f
th
e
p
o
w
er
f
r
o
m
an
air
s
tr
ea
m
o
f
in
r
ea
lit
y
,
th
e
m
ax
i
m
u
m
v
al
u
e
o
f
w
i
n
d
tu
r
b
in
e
r
o
to
r
s
in
th
e
r
an
g
e
2
5
% to
4
5
%.
T
i
p
s
p
ee
d
r
atio
o
f
a
w
i
n
d
tu
r
b
in
e
(
λ
)
is
d
ef
i
n
ed
as:
(
4
)
W
h
er
e
ω
is
r
o
tatin
g
s
p
ee
d
o
f
r
o
to
r
(
in
r
p
m
)
,
R
is
th
e
r
ad
iu
s
o
f
th
e
b
r
u
s
h
ed
ar
ea
(
in
m
eter
)
.
T
h
e
tip
s
p
ee
d
r
atio
λ
an
d
th
e
p
o
w
er
co
ef
f
icie
n
t
ar
e
th
e
d
i
m
e
n
s
io
n
les
s
an
d
s
o
th
i
s
ca
n
b
e
u
s
e
d
to
d
escr
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e
th
e
p
er
f
o
r
m
a
n
ce
o
f
a
n
y
s
ize
o
f
win
d
tu
r
b
i
n
e
b
lad
e.
W
T
s
ar
e
b
asicall
y
clas
s
i
f
ied
o
n
b
asi
s
o
f
m
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h
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ica
l
p
o
w
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co
n
tr
o
l
an
d
s
p
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d
co
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tr
o
l.
St
all
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eg
u
latio
n
a
n
d
p
itch
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e
g
u
l
atio
n
ar
e
th
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t
y
p
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o
f
m
ec
h
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ical
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er
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tr
o
l,
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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IJ
A
P
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Vo
l.
7
,
No
.
1
,
A
p
r
il
2
0
1
8
:
52
–
58
54
d
ep
en
d
o
n
co
n
s
tr
u
ctio
n
o
f
b
la
d
es.
B
ased
o
n
s
p
ee
d
co
n
tr
o
l,
W
T
s
ar
e
f
ix
ed
s
p
ee
d
an
d
v
ar
iab
le
s
p
ee
d
in
g
en
er
al.
B
u
t
in
ac
t
u
al,
f
o
u
r
t
y
p
es
o
f
W
T
s
ar
e
in
ex
is
te
n
ce
at
p
r
ese
n
t
ar
e
Fix
ed
s
p
ee
d
(
T
y
p
e1
W
T
)
,
L
i
m
ited
Var
iab
le
s
p
ee
d
(
T
y
p
e
2
W
T
)
,
D
o
u
b
l
y
Fed
I
n
d
u
ctio
n
Ge
n
er
ato
r
(
T
y
p
e
3
W
T
)
,
Fu
ll
s
ca
le
b
ac
k
-
to
-
b
ac
k
co
n
v
er
ter
(
T
y
p
e
4
W
T
)
.
Hig
h
Vo
ltag
e
Dir
ec
t
C
u
r
r
en
t
(
HVDC)
is
an
e
f
f
ec
t
iv
e
tec
h
n
o
lo
g
y
d
esi
g
n
ed
to
d
is
tr
ib
u
te
lar
g
e
a
m
o
u
n
t
o
f
elec
tr
icit
y
o
v
er
lo
n
g
d
is
ta
n
ce
w
it
h
n
e
g
li
g
ib
le
lo
s
s
e
s
.
T
h
e
lo
n
g
est
HV
DC
li
n
k
i
n
t
h
e
w
o
r
ld
is
cu
r
r
en
tl
y
in
R
io
Ma
d
eir
a
tr
an
s
m
is
s
io
n
l
in
k
,
B
r
az
il
w
it
h
a
n
o
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f
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m
.
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h
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s
e
s
at
th
e
tr
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s
m
i
s
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ea
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y
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ed
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ce
d
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y
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tr
an
s
m
is
s
io
n
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y
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te
m
.
T
h
e
r
ea
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n
f
o
r
m
o
v
i
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g
to
w
a
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d
s
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i
s
th
at
th
e
co
n
v
en
t
io
n
al
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C
u
s
e
s
li
n
e
co
m
m
u
ta
tio
n
w
h
er
e
as
t
h
e
V
SC
HVD
C
u
s
e
s
s
e
lf
-
co
m
m
u
tatio
n
.
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i
n
e
co
m
m
u
tatio
n
is
u
s
ed
to
co
n
tr
o
l
ac
tiv
e
p
o
w
er
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n
l
y
w
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ile
s
e
lf
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co
m
m
u
tatio
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i
s
u
s
ed
f
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r
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n
tr
o
l
o
f
b
o
th
ac
tiv
e
an
d
r
ea
ctiv
e
p
o
w
er
.
Vo
ltag
e
So
u
r
ce
C
o
n
v
er
ter
s
(
VS
C
-
HV
DC
)
is
e
f
f
ec
ti
v
e
s
o
l
u
tio
n
f
o
r
l
o
n
g
d
is
ta
n
ce
p
o
w
er
tr
an
s
m
is
s
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s
y
s
te
m
e
s
p
ec
iall
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f
o
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o
f
f
-
s
h
o
r
e
w
i
n
d
p
lan
ts
a
n
d
g
i
v
in
g
p
o
w
er
to
r
e
m
o
te
r
eg
io
n
s
.
Du
e
to
its
ad
v
an
ta
g
es,
VS
C
-
HVD
C
is
o
n
e
o
f
th
e
m
o
s
t
i
m
p
o
r
tan
t
co
m
p
o
n
en
t
o
f
p
o
w
er
s
y
s
te
m
s
f
o
r
u
n
d
er
g
r
o
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n
d
an
d
s
u
b
m
ar
in
e
ca
b
le
tr
an
s
m
is
s
io
n
in
th
e
f
u
tu
r
e.
T
h
e
AC
s
y
s
t
e
m
h
a
s
b
ee
n
u
s
ed
f
o
r
tr
an
s
f
er
p
o
w
er
h
a
s
b
ee
n
b
ec
o
m
e
s
tr
o
n
g
an
d
ef
f
ec
ti
v
e.
On
e
m
ai
n
p
r
o
b
lem
w
it
h
r
esp
e
ct
to
A
C
p
o
w
er
tr
an
s
m
i
s
s
io
n
is
th
e
d
if
f
ic
u
lties
a
n
d
co
n
tr
o
llab
ilit
y
o
f
th
e
s
y
s
te
m
.
T
h
is
p
r
o
b
lem
m
a
y
b
e
o
v
er
c
o
m
e
b
y
u
s
i
n
g
V
SC
b
ased
H
VDC
tr
an
s
m
is
s
io
n
s
y
s
te
m
.
T
h
ese
co
n
v
er
ter
s
r
e
q
u
ir
e
a
m
o
d
er
atel
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s
tr
o
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g
s
y
n
c
h
r
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g
e
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o
u
r
ce
co
n
v
er
ter
i
n
o
r
d
er
to
co
m
m
u
tate.
2
.
1
.
VSC
–
ba
s
ed
H
VDC
t
ra
ns
m
is
s
io
n sy
s
t
e
m
co
n
f
ig
ura
t
io
ns
T
h
e
ty
p
ic
al
s
y
s
te
m
co
n
f
ig
u
r
ati
o
n
o
f
VS
C
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b
ased
HVD
C
tr
an
s
m
is
s
io
n
s
y
s
te
m
is
p
r
esen
ted
in
F
ig
u
r
e
1
.
Fig
u
r
e
1
.
T
y
p
ical
VSC
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HV
DC
s
y
s
te
m
T
h
e
ab
o
v
e
t
y
p
ical
s
y
s
te
m
co
n
s
i
s
ts
o
f
:
t
w
o
v
o
lta
g
e
s
o
u
r
ce
co
n
v
er
ter
s
,
tr
a
n
s
f
o
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m
er
s
,
p
h
as
e
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ea
cto
r
s
,
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filt
er
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C
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li
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k
ca
p
ac
ito
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s
an
d
D
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ca
b
le
s
.
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h
e
ab
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m
p
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en
t
s
w
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ll
b
e
b
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s
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ed
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e
th
e
tr
an
s
f
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m
er
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ar
e
u
s
ed
to
in
ter
co
n
n
ec
t t
h
e
Vo
lta
g
e
So
u
r
ce
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o
n
v
er
ter
(
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w
it
h
ac
s
y
s
t
e
m
,
t
h
e
f
u
n
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f
tr
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f
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t
t
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f
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et
w
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r
k
t
o
a
v
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to
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ar
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co
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e
m
ai
n
f
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eli
m
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ar
m
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w
as
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ted
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s
i
n
g
P
u
ls
e
W
id
th
Mo
d
u
latio
n
(
P
W
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tech
n
iq
u
e.
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h
e
d
c
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ca
p
ac
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s
er
v
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as
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n
ates
t
h
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ar
m
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p
les
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d
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v
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g
e.
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n
o
f
f
-
s
h
o
r
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p
lan
t
w
e
ca
n
co
n
tr
o
l
A
C
v
o
ltag
e,
ac
tiv
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an
d
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.
I
n
o
n
-
s
h
o
r
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p
lan
t
w
e
ca
n
co
n
tr
o
l D
C
v
o
lta
g
e
an
d
r
ea
ctiv
e
p
o
w
er
.
3.
L
O
W
VO
L
T
A
G
E
R
I
DE
T
H
RO
UG
H
(
L
VR
T
)
A
cc
o
r
d
in
g
to
Gr
id
co
d
e
o
f
c
o
n
tact
th
e
w
i
n
d
g
e
n
er
atio
n
s
y
s
te
m
h
as
to
b
e
s
y
n
ch
r
o
n
ize
d
co
n
d
itio
n
ev
en
u
n
d
er
v
o
ltag
e
co
llap
s
e
co
n
d
itio
n
to
s
o
m
e
e
x
te
n
t.
T
o
av
o
id
ca
s
ca
d
in
g
an
d
d
es
y
n
c
h
r
o
n
izi
n
g
o
f
w
i
n
d
g
en
e
r
atio
n
s
y
s
te
m
u
s
ed
i
m
p
r
o
v
e
th
e
s
tab
ilit
y
.
L
VR
T
is
t
h
e
o
n
e
o
f
th
e
b
i
g
g
e
s
t
c
h
alle
n
g
e
to
w
ar
d
s
w
i
n
d
g
en
er
atio
n
s
y
s
te
m
i
n
p
ar
ticu
la
r
th
o
s
e
u
s
in
g
s
y
n
ch
o
r
o
n
o
u
s
g
en
er
ato
r
s
.
L
o
w
v
o
lta
g
e
r
id
e
th
r
o
u
g
h
i
s
o
n
e
o
f
t
h
e
m
o
s
t
i
m
p
o
r
tan
t
co
n
d
itio
n
f
o
r
in
te
g
r
atin
g
t
h
e
w
i
n
d
f
a
r
m
with
t
h
e
p
o
w
er
s
y
s
te
m
,
w
h
ich
h
as
b
ee
n
r
ec
en
tl
y
in
tr
o
d
u
ce
d
in
t
h
e
g
r
id
co
d
es.
A
cc
o
r
d
in
g
to
th
e
g
r
id
co
d
e
o
f
co
n
tact,
it
is
cr
u
cial
f
o
r
th
e
w
i
n
d
g
en
er
ato
r
s
y
s
te
m
s
to
r
e
m
ai
n
co
n
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ta
n
t
e
v
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t
h
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v
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d
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s
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r
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s
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cc
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r
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o
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y
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,
u
p
to
a
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if
ie
d
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m
e
p
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d
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n
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ted
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lta
g
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h
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s
e,
th
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ad
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lo
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s
o
f
p
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w
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e
n
er
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in
t
h
e
s
y
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te
m
,
as
a
r
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lt
o
f
t
h
e
i
n
ter
r
u
p
tio
n
o
f
t
h
e
W
E
C
S,
ca
n
ca
u
s
e
a
g
r
ea
te
r
g
en
er
atio
n
i
m
b
a
lan
ce
,
a
n
d
t
h
er
ef
o
r
e
t
h
e
s
y
s
te
m
f
r
eq
u
en
c
y
ca
n
b
e
d
r
o
p
p
e
d
.
A
ls
o
,
i
n
th
e
i
m
m
ed
iate
in
ter
r
u
p
t
io
n
o
f
w
i
n
d
g
e
n
er
atin
g
u
n
it
s
ca
n
m
a
k
e
a
lar
g
er
v
o
ltag
e
d
ip
an
d
ev
en
t
u
all
y
f
a
i
lu
r
e
+
v
o
ltag
e
s
tab
ili
t
y
i
n
th
e
af
f
ec
ted
ar
ea
.
L
o
w
v
o
lta
g
e
r
id
e
th
r
o
u
g
h
(
L
V
R
T
)
co
n
d
itio
n
i
n
v
ar
io
u
s
g
r
id
co
d
es
f
o
r
d
if
f
er
en
t
co
u
n
tr
ie
s
in
te
g
r
ated
in
E
u
r
o
p
e
an
d
s
h
o
w
n
in
Fig
u
r
e
2
.
A
cc
o
r
d
in
g
to
th
e
Ger
m
an
g
r
id
co
d
e
o
f
co
n
tact,
w
in
d
t
u
r
b
in
es
co
n
n
ec
te
d
to
th
e
p
o
w
er
s
y
s
te
m
h
av
e
to
o
p
er
ate
w
it
h
in
t
h
e
1
5
0
m
s
a
f
ter
t
h
e
f
au
lt
o
cc
u
r
r
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n
ce
,
ev
e
n
if
t
h
e
v
o
ltag
e
a
t
t
h
e
p
o
in
t
o
f
co
m
m
o
n
co
u
p
li
n
g
(
P
C
C
)
f
a
lls
to
ze
r
o
.
Fo
r
an
al
y
z
in
g
t
h
e
v
o
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e
s
tab
ilit
y
d
u
r
in
g
t
h
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f
a
u
lt
U
S
g
r
id
co
d
e
h
as
b
ee
n
co
n
s
id
er
ed
as
s
h
o
w
n
in
th
e
Fi
g
u
r
e
3.
I
n
Un
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States
(
U
S)
g
r
id
co
d
e,
ac
co
r
d
in
g
to
t
h
e
lo
w
v
o
ltag
e
r
id
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t
h
r
o
u
g
h
(
L
V
R
T
)
r
e
q
u
ir
e
m
e
n
t,
t
h
e
w
i
n
d
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I
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IJ
A
P
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Vo
l.
7
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No
.
1
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A
p
r
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2
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1
8
:
52
–
58
58
Gen
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C
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.
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[7
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.
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