22 System description
The basic DTC block selects the inverter switch states so that tangential motion of the flux
vector is controlled by the torque error and the radial motion of the flux is controlled by the
flux error. The torque reference is supplied by the WTC. The torque feedback is calculated
by using stator-side quantities (at grid frequencies) ie, by a cross product of stator flux and
stator current.
~
=
~
3~
=
RDCU
NDCU
F
lux re
fe
rence
Ac
tu
al flu
x
P
ref
To
rq
ue
re
fer
ence
A
ctu
a
l to
rq
ue
Hyst
eresis band
cont
ro
l
T
w
o level hyst
eresis
cont
ro
l
Thr
ee level hyste
resis
cont
ro
l
ma
x
re
f
min
ma
x
re
f
mi
n
To
rq
ue and
f
lux
calcula
tio
n
To
rqu
e
and fl
ux
calculat
ion
Flux b
it
Swit
ch
ing fr
eque
ncy
To
rque
bi
ts
ASIC
ASIC
Op
tim
u
m
pu
ls
e
selec
tor
Op
tim
u
m
pu
ls
e
selec
tor
Curr
ent
DC li
nk voltage
Grid voltage
Swit
ch posit
ion command
s
Switch
po
siti
ons
NAMU /
BAMU
(opti
onal)
NUIM
Act
ual f
lux
Flux r
e
fe
rence
Ac
tu
al flu
x
P
ref
To
rque
ref
e
ren
ce
Actu
al to
rque
ma
x
re
f
min
ma
x
re
f
mi
n
Flu
x secto
r
ident
ificati
o
n
H
yst
eresis band
cont
rol
Tw
o
le
vel hyst
ere
si
s cont
rol
T
hree level
hyst
eresis
con
tr
o
l
Flux bit
S
witchin
g fre
quen
cy
To
rque bit
s
Adap
tive gen
erat
or
mod
e
l
Swit
ch posit
ion commands
S
witch posit
ions
DC link v
olta
g
e
Rot
o
r curren
t
Act
ual f
lux
A
ctua
l t
o
rq
ue
Gr
id
f
lu
x
S
tat
or f
lux
S
tat
or curre
nt
Ro
to
r p
os
itio
n
LCL
filter
IS
U
INU
cr
ow
ba
r
DFIG
Содержание ACS800-67
Страница 1: ...ABB wind turbine converters System description and start up guide ACS800 67 wind turbine converters ...
Страница 4: ......
Страница 76: ...76 Start up with medium voltage stator ...
Страница 99: ...Practical examples 99 1 4 4 3 2 5 6 7 ...
Страница 106: ...106 Practical examples Counterclockwise rotation at drive end D end Power cabinet Encoder ...
Страница 118: ...118 Tracing the source of warnings limits and faults ...
Страница 120: ...Contact us www abb com windconverters 3AUA0000095094 Rev B EN 2017 12 31 ...