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o
w
er
elec
tr
o
n
ic
co
n
v
er
ter
s
to
g
en
er
ate
o
r
ab
s
o
r
b
r
ea
ctiv
e
p
o
w
er
,
th
u
s
eli
m
i
n
atin
g
th
e
n
ee
d
f
o
r
in
s
tal
lin
g
ca
p
ac
it
o
r
b
an
k
s
.
I
n
[
2
-
3
]
v
ar
io
u
s
i
s
s
u
es
&
c
h
all
en
g
e
s
o
f
i
n
te
g
r
atin
g
r
en
e
w
ab
le
s
o
u
r
ce
s
i
n
to
th
e
g
r
id
an
d
th
e
in
f
lu
e
n
c
e
o
f
w
i
n
d
t
u
r
b
in
e
o
n
t
h
e
g
r
id
h
a
v
e
b
ee
n
d
is
c
u
s
s
ed
.
A
.
K.
P
ath
a
k
et.
al
[
4
]
h
a
v
e
g
i
v
en
a
cr
itica
l
r
ev
ie
w
o
n
v
o
lta
g
e
an
d
r
ea
ctiv
e
p
o
w
er
m
a
n
ag
e
m
en
t
o
f
w
i
n
d
f
ar
m
s
to
g
r
id
.
T
h
e
m
o
d
elin
g
a
n
d
s
i
m
u
latio
n
o
f
DFI
G
alo
n
g
w
it
h
co
r
r
esp
o
n
d
in
g
co
n
v
er
ter
co
n
tr
o
ls
h
as
b
ee
n
d
escr
ib
ed
in
[
5
-
9
]
.
A
co
n
tr
o
l
m
et
h
o
d
f
o
r
a
DFI
G
m
ac
h
i
n
e
in
v
er
ter
in
o
r
d
er
to
r
eg
u
late
t
h
e
ac
ti
v
e
an
d
r
ea
ctiv
e
p
o
w
er
e
x
c
h
an
g
ed
b
et
w
ee
n
t
h
e
m
ac
h
i
n
e
a
n
d
th
e
g
r
id
co
n
s
is
t
in
g
o
f
u
s
ed
i
n
w
i
n
d
e
n
er
g
y
co
n
v
er
s
io
n
s
y
s
te
m
s
i
s
p
r
o
p
o
s
ed
in
[
1
0
]
.
I
n
[
1
1
]
,
g
r
id
co
d
es
th
at
m
ak
e
w
i
n
d
en
er
g
y
co
m
p
atib
le
to
g
r
id
i
n
teg
r
at
io
n
ar
e
co
n
s
id
er
ed
.
I
n
[
1
2
]
,
l
o
w
v
o
ltag
e
r
id
e
th
r
o
u
g
h
ca
p
ab
ilit
y
o
f
DFI
G
b
ased
w
i
n
d
en
er
g
y
co
n
v
er
s
io
n
s
y
s
te
m
in
t
h
e
as
y
m
m
etr
ical
g
r
id
f
au
lt
s
it
u
atio
n
is
an
al
y
ze
d
an
d
co
n
tr
o
l
s
ch
e
m
e
to
s
u
p
p
o
r
t
th
e
p
o
w
e
r
g
r
id
an
d
m
itig
ate
t
h
e
o
s
ci
llatio
n
s
i
n
t
h
e
g
en
er
ato
r
to
r
q
u
e
an
d
d
c
li
n
k
v
o
ltag
e
i
s
p
r
o
p
o
s
ed
.
I
n
[
1
3
-
1
4
]
a
s
o
l
u
tio
n
is
d
escr
i
b
ed
to
li
m
it
t
h
e
h
i
g
h
cu
r
r
en
t i
n
th
e
r
o
to
r
d
u
r
in
g
g
r
id
f
a
u
lt
s
i
n
o
r
d
er
to
p
r
o
tect
th
e
co
n
v
er
ter
th
r
o
u
g
h
a
cr
o
w
b
ar
cir
cu
it
co
n
s
is
ti
n
g
o
f
a
s
et
o
f
b
y
p
as
s
r
esis
to
r
s
co
n
n
ec
ted
to
th
e
r
o
to
r
w
in
d
i
n
g
s
.
T
h
er
ef
o
r
e,
f
au
lt
c
u
r
r
en
t
c
h
ar
ac
ter
is
tics
o
f
DFI
G
d
u
r
in
g
s
lig
h
t
v
o
ltag
e
d
ip
s
[
1
5
]
ar
e
s
tu
d
ied
.
I
n
[
1
6
]
,
an
ad
ap
tiv
e
f
a
u
lt
r
id
e
t
h
r
o
u
g
h
s
t
r
ateg
y
is
p
r
o
p
o
s
ed
f
o
r
s
y
s
te
m
s
w
it
h
h
i
g
h
p
en
etr
atio
n
o
f
w
i
n
d
a
n
d
m
ax
i
m
u
m
p
o
w
er
r
estrictio
n
s
o
n
t
h
e
w
i
n
d
f
ar
m
s
.
I
n
[
1
7
]
,
Su
p
er
co
n
d
u
ctin
g
Fa
u
lt
C
u
r
r
en
t
L
i
m
it
er
,
w
h
ich
h
as
t
h
e
co
m
p
ete
n
ce
to
li
m
it t
h
e
f
a
u
lt c
u
r
r
en
t a
n
d
p
r
o
tect
th
e
eq
u
ip
m
e
n
ts
f
r
o
m
d
a
m
a
g
e
is
p
r
o
p
o
s
ed
.
T
h
e
p
ap
er
is
o
r
g
an
ized
as
f
o
l
lo
w
s
:
Sectio
n
2
p
r
e
s
en
ts
t
h
e
m
o
d
ell
in
g
o
f
D
FIG
s
y
s
te
m
.
T
h
e
co
n
tr
o
l
tech
n
iq
u
e
o
f
DFI
G
s
y
s
te
m
is
g
iv
e
n
in
s
ec
tio
n
3
.
T
h
e
d
etails
ab
o
u
t
f
au
lt
r
id
e
th
r
o
u
g
h
ca
p
ab
ilit
y
ar
e
m
en
tio
n
ed
in
s
ec
tio
n
4
.
T
h
e
p
r
o
p
o
s
ed
p
r
o
tectio
n
s
ch
e
m
e
is
p
r
esen
t
ed
in
s
ec
tio
n
5
.
T
h
e
r
esu
lts
an
d
d
is
cu
s
s
io
n
s
ar
e
s
u
m
m
ar
ized
in
s
ec
t
io
n
6
an
d
i
s
co
n
clu
d
ed
in
s
ec
tio
n
7
.
2.
M
O
DE
L
I
N
G
O
F
DF
I
G
SY
S
T
E
M
T
h
e
DFI
G
s
y
s
te
m
is
m
o
d
ele
d
as
f
o
llo
w
s
:
A
d
-
q
r
e
f
er
en
ce
f
r
a
m
e
i
s
c
h
o
s
e
n
to
m
o
d
el
th
e
DFI
G.
T
h
e
s
tato
r
an
d
r
o
to
r
v
o
ltag
es o
f
a
DFI
G
ar
e
m
e
n
tio
n
ed
:
V
s
= R
s
I
s
+
+
j ω
s
ψ
s
(
1
)
V
r
= R
r
I
r
+
+
j
ω
sl
ψ
r
(
2
)
W
h
er
e,
ψ
s
= L
ls
I
s
+ L
m
I
r
ψ
r
= L
m
I
s
+ L
lr
I
r
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8
694
IJ
PEDS
Vo
l.
7
,
No
.
4
,
Dec
em
b
er
2
0
1
6
:
1
3
6
6
–
1
3
7
6
1368
R
s
a
n
d
R
r
ar
e
th
e
s
tato
r
an
d
r
o
to
r
r
esis
tan
ce
s
r
esp
ec
ti
v
el
y
.
L
ls
,
L
lr
an
d
L
m
ar
e
th
e
s
t
ato
r
,
r
o
to
r
an
d
m
a
g
n
e
tizi
n
g
i
n
d
u
cta
n
ce
s
r
esp
ec
tiv
el
y
.
V
s
an
d
V
r
ar
e
s
ta
to
r
an
d
r
o
to
r
v
o
ltag
es,
I
s
an
d
I
r
ar
e
th
eir
cu
r
r
en
t
s
.
T
h
e
s
tato
r
an
d
s
lip
s
p
ee
d
ar
e
ω
s
an
d
ω
sl
=
ω
s
-
ω
r
an
d
ω
r
is
t
h
e
r
o
to
r
an
g
u
lar
s
p
ee
d
.
ψ
s
an
d
ψ
r
ar
e
s
tato
r
an
d
r
o
to
r
f
lu
x
li
n
k
ag
e
s
.
Fig
u
r
e
2
.
E
q
u
iv
ale
n
t c
ir
cu
it o
f
DFI
G
in
d
q
-
r
ef
er
e
n
ce
f
r
a
m
e
T
h
e
elec
tr
ical
m
o
d
el
o
f
DFI
G
in
s
y
n
ch
r
o
n
o
u
s
r
ef
er
e
n
ce
f
r
a
m
e
(
d
q
-
f
r
a
m
e)
i
s
g
i
v
en
i
n
Fi
g
u
r
e
2
a
n
d
t
h
e
eq
u
a
tio
n
s
,
w
h
er
e
q
u
an
titi
e
s
o
f
r
o
to
r
s
id
e
ar
e
r
ef
er
r
ed
to
s
tato
r
s
id
e.
Su
b
s
cr
ip
ts
‘
s
’
an
d
‘
r
’
r
ef
er
to
s
ta
to
r
an
d
r
o
to
r
s
id
e
r
esp
ec
ti
v
el
y
,
w
h
ile
‘
d
’
an
d
‘
q
’
r
ef
er
to
d
ir
ec
t
an
d
q
u
ad
r
atu
r
e
ax
es r
esp
ec
ti
v
el
y
.
V
ds
= R
s
i
ds
+
-
ω
s
ψ
qs
(
3)
V
qs
= R
s
i
qs
+
+ ω
s
ψ
ds
(
4
)
V
dr
= R
r
i
dr
+
-
sω
s
ψ
qr
(
5
)
V
qr
= R
r
i
qr
+
+
s
ω
s
ψ
dr
(
6
)
ψ
ds
=
(
L
ls
+
L
m
)
i
ds
+ L
m
i
dr
(
7
)
ψ
qs
=
(
L
ls
+
L
m
)
i
qs
+ L
m
i
qr
(
8
)
ψ
dr
=
(
L
lr
+ L
m
)
i
dr
+
L
m
i
ds
(
9
)
ψ
qr
=
(
L
lr
+ L
m
)
i
qr
+
L
m
i
qs
(
1
0
)
w
h
er
e
L
ls
+
L
m
=
L
s
an
d
L
lr
+ L
m
=
L
r
T
h
e
elec
tr
o
m
a
g
n
et
ic
to
r
q
u
e
is
g
iv
e
n
b
y
T
e
=
1
.
5
(
ψ
qr
i
dr
-
ψ
dr
i
qr
)
(
1
1
)
An
d
th
e
eq
u
at
io
n
o
f
m
o
tio
n
i
s
g
iv
e
n
b
y
ω
(
1
2
)
Evaluation Warning : The document was created with Spire.PDF for Python.
I
J
PEDS
I
SS
N:
2088
-
8
694
E
n
h
a
n
ce
d
C
r
o
w
b
a
r
P
r
o
tectio
n
fo
r
F
R
T
C
a
p
a
b
ilit
y
o
f W
in
d
Gen
era
tio
n
S
ystems
(
V
.
Mo
h
a
n
a
K
a
lya
n
i
)
1369
W
h
er
e
ω
is
t
h
e
m
ec
h
a
n
ical
a
n
g
u
lar
s
p
ee
d
o
f
t
h
e
r
o
to
r
,
is
th
e
m
ec
h
a
n
ical
in
er
tia
co
n
s
ta
n
t
o
f
g
e
n
er
ato
r
,
an
d
is
th
e
m
ec
h
a
n
ical
to
r
q
u
e
p
r
o
d
u
ce
d
b
y
th
e
w
i
n
d
tu
r
b
in
e.
A
cti
v
e
p
o
w
er
f
lo
w
s
t
h
r
o
u
g
h
r
o
to
r
an
d
s
tato
r
o
f
th
e
g
e
n
er
ato
r
an
d
co
m
b
i
n
atio
n
o
f
b
o
th
co
n
s
tr
u
c
ts
t
h
e
to
tal
ac
tiv
e
p
o
w
er
.
T
h
e
eq
u
atio
n
f
o
r
r
ea
c
tiv
e
p
o
w
er
m
i
g
h
t
b
e
d
if
f
er
en
t
f
r
o
m
th
e
ac
tu
al
r
ea
cti
v
e
p
o
w
er
,
w
h
ic
h
i
s
f
ed
in
to
th
e
g
r
id
as
r
ea
cti
v
e
p
o
w
er
f
lo
w
in
g
f
r
o
m
r
o
to
r
s
id
e
o
f
th
e
DFI
G
d
ep
en
d
s
o
n
th
e
co
n
tr
o
l stra
teg
y
o
f
it
s
p
o
w
er
elec
tr
o
n
ic
co
n
v
er
ter
s
.
Gr
id
Sid
e
C
o
n
v
er
ter
(
GSC
)
ca
n
p
r
o
v
id
e
s
o
m
e
a
m
o
u
n
t
o
f
r
ea
ctiv
e
p
o
w
er
d
ep
en
d
in
g
o
n
it
s
ca
p
ac
it
y
.
T
h
er
ef
o
r
e,
GSC
i
m
p
ac
t
m
u
s
t
b
e
tak
en
i
n
to
ac
co
u
n
t i
n
p
o
w
e
r
f
lo
w
ca
lc
u
latio
n
.
P
=
P
s
+
P
r
=1
.
5
(
V
ds
i
ds
+ V
qs
i
qs
+ V
dr
i
dr
+ V
qr
i
qr
)
(
1
3
)
Q
=
Q
s
+ Q
r
=1
.
5
(
V
qs
i
ds
-
V
ds
i
qs
+ V
qr
i
dr
-
V
dr
i
qr
)
(
1
4
)
P
o
w
er
co
n
v
er
ter
s
ca
n
n
o
t
g
e
n
e
r
ate
o
r
co
n
s
u
m
e
ac
tiv
e
p
o
w
er
,
alth
o
u
g
h
t
h
e
y
ca
n
p
r
o
d
u
ce
o
r
co
n
s
u
m
e
r
ea
ctiv
e
p
o
w
er
.
Du
e
to
th
i
s
f
a
ct,
co
n
tr
o
l
s
tr
ateg
y
o
f
p
o
w
er
co
n
v
er
ter
s
d
o
es
n
o
t
h
a
v
e
an
y
i
m
p
ac
t
o
n
th
e
ac
ti
v
e
p
o
w
er
f
lo
w
.
Als
o
,
all
th
e
ac
ti
v
e
p
o
w
er
th
at
f
lo
w
s
i
n
to
,
f
r
o
m
t
h
e
r
o
to
r
w
i
n
d
in
g
w
il
l
b
e
d
r
a
w
n
o
r
f
ed
i
n
to
t
h
e
g
r
id
,
r
esp
ec
tiv
el
y
.
3.
CO
NT
RO
L
M
E
CH
ANI
SM
O
F
DF
I
G
SY
ST
E
M
T
h
e
co
n
tr
o
l
m
ec
h
a
n
i
s
m
in
th
e
w
i
n
d
t
u
r
b
in
es
p
la
y
s
an
i
m
p
o
r
tan
t
r
o
le
to
co
n
tr
o
l
an
d
e
x
tr
ac
t
t
h
e
m
ax
i
m
u
m
e
n
er
g
y
f
r
o
m
a
v
aila
b
le
w
in
d
w
h
i
le
p
r
o
tectin
g
t
h
e
w
in
d
tu
r
b
i
n
e
co
m
p
o
n
en
t
s
.
T
h
e
g
en
er
ato
r
s
p
ee
d
co
n
tr
o
l
is
th
e
m
o
s
t
e
f
f
ec
tiv
e
w
a
y
to
e
x
tr
ac
t
th
e
m
a
x
i
m
u
m
p
o
w
er
f
r
o
m
a
lo
w
w
i
n
d
s
p
ee
d
b
y
u
s
i
n
g
t
h
e
p
o
w
er
elec
tr
o
n
ic
co
n
v
er
ter
s
.
3
.
1
.
P
i
t
ch
Ang
le
Co
ntr
o
l
P
itch
an
g
le
ad
j
u
s
t
m
e
n
t
is
a
v
e
r
y
e
f
f
ec
ti
v
e
w
a
y
to
li
m
i
t
o
u
tp
u
t
p
o
w
er
b
y
ch
a
n
g
i
n
g
ae
r
o
d
y
n
a
m
ic
f
o
r
ce
o
n
th
e
b
lad
e
at
h
i
g
h
w
i
n
d
s
p
ee
d
s
.
T
h
e
p
itch
co
n
tr
o
l s
y
s
te
m
c
an
b
e
ef
f
ec
ti
v
el
y
u
s
ed
to
p
r
ev
e
n
t t
h
e
w
in
d
s
y
s
te
m
f
r
o
m
ex
ce
s
s
s
p
ee
d
in
cr
ea
s
e,
s
o
th
at
th
e
r
o
to
r
s
p
ee
d
s
tab
ilit
y
o
f
th
e
w
i
n
d
g
e
n
er
ato
r
ca
n
b
e
en
h
an
ce
d
.
R
o
to
r
s
p
ee
d
s
tab
ilit
y
r
ef
er
s
to
t
h
e
ab
ilit
y
o
f
a
n
i
n
d
u
ctio
n
(
as
y
n
ch
r
o
n
o
u
s
)
m
ac
h
i
n
e
to
r
e
m
ai
n
co
n
n
ec
ted
to
t
h
e
elec
tr
ic
p
o
w
er
s
y
s
te
m
a
n
d
r
u
n
n
i
n
g
at
a
m
ec
h
an
ica
l
s
p
ee
d
clo
s
e
to
th
e
s
p
ee
d
co
r
r
esp
o
n
d
in
g
to
t
h
e
ac
tu
a
l
s
y
s
te
m
f
r
eq
u
en
c
y
a
f
ter
b
ein
g
s
u
b
j
ec
ted
to
a
d
is
tu
r
b
an
ce
.
T
h
e
p
itch
a
n
g
le
is
ca
lc
u
lated
b
y
a
n
o
p
en
lo
o
p
co
n
tr
o
l
o
f
r
eg
u
la
ted
tu
r
b
in
e
s
p
ee
d
as s
h
o
w
n
i
n
Fi
g
u
r
e
3
.
Fig
u
r
e
3
.
P
itch
an
g
le
co
n
tr
o
ller
3
.
2
.
St
a
t
o
r
Sid
e
Co
nv
er
t
er
Co
ntr
o
l
T
h
e
Gr
id
s
i
d
e
co
n
v
er
ter
i
s
u
s
ed
to
r
eg
u
late
t
h
e
v
o
lta
g
e
o
f
t
h
e
D
C
b
u
s
ca
p
ac
ito
r
.
Fo
r
th
e
s
tato
r
s
id
e
co
n
tr
o
ller
th
e
d
-
a
x
is
o
f
t
h
e
r
o
tatin
g
r
ef
er
e
n
ce
f
r
a
m
e
u
s
ed
f
o
r
d
-
q
tr
an
s
f
o
r
m
a
tio
n
i
s
ali
g
n
ed
w
it
h
t
h
e
p
o
s
itiv
e
s
eq
u
en
ce
o
f
g
r
id
v
o
ltag
e.
F
ig
u
r
e
4
s
h
o
w
s
t
h
e
co
n
tr
o
l
s
y
s
te
m
o
f
t
h
e
Sta
to
r
Sid
e
C
o
n
v
er
t
er
w
h
ich
i
s
u
s
ed
to
r
eg
u
late
t
h
e
D
C
lin
k
v
o
ltag
e
b
et
w
ee
n
b
o
th
co
n
v
er
ter
s
.
T
h
e
co
n
tr
o
l
o
f
th
e
s
tato
r
s
id
e
co
n
v
er
ter
is
p
er
f
o
r
m
ed
u
s
i
n
g
t
h
e
d
q
r
ef
er
en
ce
f
r
a
m
e.
T
h
e
ac
tu
al
v
o
ltag
e
V
dc
at
th
e
D
C
li
n
k
i
s
co
m
p
ar
ed
w
it
h
its
r
ef
er
en
ce
v
alu
e
V
dc
_
ref
a
n
d
t
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e
er
r
o
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et
wee
n
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r
o
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g
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a
P
I
c
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tr
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w
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ich
d
eter
m
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ref
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T
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latter
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ig
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e
n
tr
an
s
f
o
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m
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to
ab
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.
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Fig
u
r
e
4
.
Stato
r
s
id
e
co
n
v
er
ter
co
n
tr
o
l
3
.
3
.
R
o
t
o
r
Sid
e
Co
nv
er
t
er
Co
ntr
o
l
T
h
e
r
o
to
r
-
s
id
e
co
n
v
er
ter
co
n
t
r
o
ller
is
u
s
ed
to
co
n
tr
o
l
i
n
d
ep
en
d
en
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y
t
h
e
s
tato
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lta
g
e
(
o
r
r
ea
ctiv
e
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w
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d
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tp
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t
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v
e
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o
w
er
o
f
th
e
w
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d
t
u
r
b
in
e.
T
h
e
g
en
er
ic
co
n
tr
o
l
lo
o
p
[
9
]
is
illu
s
tr
ated
in
Fig
u
r
e
5
.
Sin
ce
th
e
co
n
v
er
ter
o
p
er
ates
in
a
s
ta
to
r
-
f
lu
x
dq
-
r
ef
er
en
ce
f
r
a
m
e,
th
e
r
o
to
r
cu
r
r
en
t
is
d
e
co
m
p
o
s
ed
in
to
an
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tiv
e
p
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er
(
d
-
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)
a
n
d
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r
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ctiv
e
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(
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m
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t.
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h
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e
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i
n
d
s
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ee
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ch
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g
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e
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ti
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r
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o
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e)
p
o
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o
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th
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g
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er
ato
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ill
al
s
o
ch
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e.
A
s
s
h
o
w
n
i
n
Fi
g
u
r
e
5
,
ac
tu
al
ac
ti
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e
p
o
w
er
o
f
th
e
g
e
n
er
ato
r
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ar
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w
it
h
r
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er
e
n
ce
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o
in
t
v
al
u
e,
w
h
ic
h
i
s
d
eter
m
i
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ed
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y
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e
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i
n
d
s
p
ee
d
.
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h
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d
if
f
er
e
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ce
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ee
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t
h
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w
o
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s
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ll
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P
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o
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tio
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n
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g
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n
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o
ller
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w
h
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h
i
s
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ate
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e
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ate
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s
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r
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I
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n
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o
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e
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an
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ed
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r
o
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th
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q
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r
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m
e
in
to
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c
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tain
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e
r
eq
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ir
ed
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al
u
e
o
f
r
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to
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c
u
r
r
en
ts
.
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h
e
tr
ig
g
e
r
in
g
p
u
l
s
es
w
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ld
co
n
tr
o
l
th
e
I
GB
T
s
w
itch
e
s
i
n
th
e
r
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to
r
-
s
id
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co
n
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ter
a
n
d
t
h
at
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l
en
h
a
n
ce
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s
tab
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en
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ir
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s
y
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m
b
y
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u
s
tai
n
in
g
t
h
e
f
r
eq
u
e
n
c
y
a
n
d
v
o
ltag
e
w
it
h
in
p
er
m
is
s
ib
le
to
ler
an
ce
s
.
Fig
u
r
e
5
.
R
o
to
r
s
id
e
co
n
v
er
ter
co
n
tr
o
l
4.
L
O
W
VO
L
T
A
G
E
R
I
D
E
T
H
RO
UG
H
(
L
VR
T
)
CAP
AB
I
L
I
T
Y
O
F
DF
I
G
:
W
h
en
e
v
er
th
er
e
is
a
g
r
id
v
o
lt
ag
e
d
ip
ca
u
s
ed
b
y
a
f
a
u
lt
in
th
e
g
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id
,
it
r
es
u
lt
s
i
n
t
h
e
s
tato
r
v
o
ltag
e
d
ip
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d
in
d
u
ce
s
a
lar
g
e
cu
r
r
en
t
i
n
th
e
r
o
to
r
s
id
e
lead
in
g
to
o
v
er
-
cu
r
r
en
t
i
n
th
e
r
o
to
r
an
d
o
v
er
v
o
ltag
e
ac
r
o
s
s
th
e
d
c
lin
k
ca
p
ac
ito
r
.
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h
e
o
v
er
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c
u
r
r
en
t
a
n
d
o
v
er
v
o
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g
e
w
ill
d
estro
y
th
e
co
n
v
er
ter
s
a
n
d
th
e
DFI
G.
P
r
o
tectin
g
r
o
to
r
s
id
e
co
n
v
er
ter
(
R
S
C
)
d
u
r
in
g
g
r
id
f
au
lts
b
ec
o
m
es
a
v
i
ta
l
is
s
u
e,
w
h
ic
h
ca
n
b
e
s
o
l
v
ed
b
y
s
h
o
r
tin
g
th
e
r
o
to
r
cir
cu
it
o
f
t
h
e
i
n
d
u
ctio
n
g
e
n
er
ato
r
th
r
o
u
g
h
t
u
r
n
i
n
g
o
n
a
cr
o
w
b
ar
.
T
r
ad
itio
n
al
o
p
er
atio
n
al
g
u
id
eli
n
es
an
d
r
elev
a
n
t
s
tan
d
ar
d
s
f
o
r
win
d
p
o
w
er
g
en
er
atio
n
s
y
s
te
m
s
r
eq
u
ir
e
t
h
e
w
i
n
d
p
o
w
er
g
en
er
ato
r
to
b
e
o
f
f
au
to
m
at
icall
y
w
h
e
n
a
f
a
u
lt
o
r
an
ab
n
o
r
m
al
o
p
er
atio
n
o
cc
u
r
s
i
n
t
h
e
g
r
id
.
B
u
t
w
i
th
t
h
e
d
e
v
elo
p
m
e
n
t
o
f
w
i
n
d
p
o
w
er
tech
n
o
lo
g
ies,
g
r
id
-
c
o
n
n
ec
ted
w
in
d
s
y
s
te
m
s
h
a
v
e
co
n
s
id
er
ab
le
in
f
lu
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ase
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CO
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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PEDS
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SS
N:
2088
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RE
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NC
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S
[1
]
T
.
Ac
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m
a
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n
.
W
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.
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P.
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n
a
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In
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R.
Je
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b
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V
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Ren
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Rev
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.
2
0
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4
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2
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–
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1
.
[3
]
Dr.
M
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th
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h
u
,
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a
k
T
h
a
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Ch
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Ca
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Util
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Re
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teg
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J
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En
g
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Res
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Ap
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2
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4
;
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):
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3
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.
[4
]
A
.
K.
P
a
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a
k
,
M
.
P
.
S
h
a
rm
a
,
M
a
h
e
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Bu
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le.
A
c
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ica
l
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v
ie
w
o
f
v
o
lt
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g
e
a
n
d
re
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c
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w
in
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f
a
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m
s.
Ren
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le &
S
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En
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Rev
iews
.
2
0
1
5
;
5
1
:
4
6
0
–
4
7
1
.
[5
]
He
e
-
S
a
n
g
Ko
,
G
i
-
G
a
b
Yo
o
n
,
N
a
m
-
Ho
K
y
u
n
g
,
W
o
n
-
P
y
o
Ho
n
g
.
M
o
d
e
li
n
g
a
n
d
c
o
n
tr
o
l
o
f
DFIG
-
b
a
se
d
v
a
riab
le
-
sp
e
e
d
w
in
d
-
tu
r
b
in
e
.
El
e
c
tric P
o
w
e
r S
y
ste
ms
Res
e
a
rc
h
.
2
0
0
8
;
7
8
:
1
8
4
1
–
1
8
4
9
.
[6
]
Nic
h
o
las
W
.
M
il
ler,
W
il
li
a
m
W.
P
rice
,
Ju
a
n
J.
S
a
n
c
h
e
z
-
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a
sc
a
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y
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li
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E
1
.
5
a
n
d
3
.
6
W
in
d
T
u
rb
in
e
-
G
e
n
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ra
to
rs.
GE
-
Po
we
r S
y
ste
ms
En
e
rg
y
Co
n
su
l
ti
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g
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E
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TG
M
o
d
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li
n
g
-
v3
-
0
.
d
o
c
,
1
0
/2
7
/0
3
.
[7
]
P
h
lea
rn
Ja
n
su
y
a
,
Yu
tt
a
n
a
Ku
m
su
w
a
n
.
De
sig
n
o
f
M
AT
LAB/S
im
u
li
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k
M
o
d
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li
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ix
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d
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P
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tch
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lato
r.
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e
rg
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Pr
o
c
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ia
.
2
0
1
3
;
3
4
:
3
6
2
–
3
7
0
.
[8
]
Ra
k
e
sh
S
h
a
rm
a
,
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ld
e
e
p
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a
h
a
y
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te
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ra
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in
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h
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o
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im
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latio
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o
f
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ix
e
d
a
n
d
V
a
riab
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p
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d
o
f
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in
d
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y
ste
m
.
IJ
RDET
.
2
0
1
4
;
3
6
2
–
3
7
0
.
[9
]
C.
Ha
m
o
n
.
Do
u
b
ly
-
f
e
d
I
n
d
u
c
ti
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ra
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a
ste
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h
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sis,
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H S
c
h
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e
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tri
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a
l
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g
i
n
e
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rin
g
.
2
0
1
0
.
[1
0
]
F
.
P
o
it
iers
,
T
.
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u
a
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M
.
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m
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ra
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w
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n
v
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rsio
n
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e
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tri
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r S
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Re
se
a
rc
h
.
2
0
0
9
;
7
9
:
1
0
8
5
–
1
0
9
6
.
[1
1
]
Be
rk
Ro
n
a
,
On
d
e
r
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u
ler.
P
o
w
e
r
s
y
ste
m
in
teg
ra
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f
w
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d
f
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a
n
d
a
n
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ly
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o
f
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o
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re
q
u
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ts.
Ren
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le
a
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d
S
u
sta
in
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b
le E
n
e
rg
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Rev
iews
.
2
0
1
5
;
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9
:
1
0
0
–
1
0
7
.
[1
2
]
Hu
a
G
e
n
g
,
Co
n
g
L
iu
,
G
e
n
g
Ya
n
g
.
L
V
RT
Ca
p
a
b
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-
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se
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s
y
m
m
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tri
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rid
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a
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lt
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n
d
it
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n
.
IEE
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tra
n
s
a
c
ti
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n
s o
n
In
d
u
stria
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e
lec
tro
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cs
.
2
0
1
2
;
6
0
(
6
):
2
4
9
5
-
2
5
0
9
.
[1
3
]
S
h
il
p
a
M
ish
ra
,
J.N
Iy
e
r.
Cro
w
b
a
r
P
r
o
tec
ti
o
n
o
f
M
icro
-
G
rid
w
it
h
DFIG
W
in
d
T
u
rb
in
e
.
In
ter
n
a
ti
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n
a
l
J
o
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rn
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l
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c
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ti
fi
c
E
n
g
in
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e
rin
g
a
n
d
Res
e
a
rc
h
.
2
0
1
4
;
2
(
1
).
[1
4
]
Jo
h
a
n
M
o
rre
n
a
n
d
S
jo
e
rd
W
.
H.
d
e
Ha
a
n
.
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e
t
h
ro
u
g
h
o
f
W
in
d
T
u
rb
in
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w
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h
Do
u
b
ly
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e
d
In
d
u
c
ti
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ra
to
r
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g
a
V
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lt
a
g
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Dip
.
IEE
E
T
ra
n
sa
c
ti
o
n
s o
n
E
n
e
rg
y
Co
n
v
e
rs
io
n
.
2
0
0
5
;
2
0
(
2
).
[1
5
]
X
ian
g
p
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n
g
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n
g
,
Z
h
e
Z
h
a
n
g
,
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ian
g
g
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n
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,
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h
e
n
x
in
g
L
i.
S
tu
d
y
o
n
F
a
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lt
C
u
rre
n
t
o
f
DFIG
d
u
rin
g
S
li
g
h
t
F
a
u
l
t
Co
n
d
it
io
n
.
T
EL
KOM
NIKA
.
2
0
1
3
;
1
1
(
4
):
2
2
2
1
-
2
2
3
0
.
[1
6
]
S
o
n
g
y
a
n
W
a
n
g
a
,
Nin
g
Ch
e
n
,
Da
re
n
Yu
,
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o
if
e
F
o
ley
,
L
in
g
z
h
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Zh
u
,
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n
g
L
i,
Jilai
Yu
.
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lex
ib
le
f
a
u
lt
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d
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th
r
o
u
g
h
stra
teg
y
f
o
r
w
in
d
f
a
r
m
c
lu
ste
rs
in
p
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m
s
w
it
h
h
ig
h
w
in
d
p
o
w
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p
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n
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tratio
n
.
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n
e
rg
y
Co
n
v
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rs
io
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a
n
d
M
a
n
a
g
e
m
e
n
t.
2
0
1
5
;
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3
:
2
3
9
–
2
4
8
.
[1
7
]
A
n
ju
M
,
R.
Ra
jas
e
k
a
r
a
n
.
P
o
w
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r
S
y
st
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m
S
tab
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h
a
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d
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p
ro
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p
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CL
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ter
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g
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