6 folier pr. side - NTNU
6 folier pr. side - NTNU
6 folier pr. side - NTNU
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<strong>NTNU</strong><br />
<strong>NTNU</strong><br />
<strong>NTNU</strong><br />
Slide 277<br />
Slide 279<br />
Slide 281<br />
■ Denne ble utledet i kapittel 4:<br />
U dc ( t)<br />
U sa ( t)<br />
= ⋅ u sta ( t − Tv<br />
)<br />
2<br />
U dc ( t)<br />
U sc ( t)<br />
= ⋅ u stc ( t − Tv<br />
)<br />
2<br />
■ Pu-modell:<br />
1<br />
u sa ( t)<br />
= �u<br />
�dc<br />
⋅ u dc ( t)<br />
⋅ u sta ( t − Tv<br />
)<br />
2<br />
1<br />
u sc ( t)<br />
= �u<br />
� dc ⋅ u dc ( t)<br />
⋅ u stc ( t − Tv<br />
)<br />
2<br />
U dn<br />
�u<br />
�dc<br />
=<br />
Û n<br />
■ Pu-modell:<br />
Middelverdi-modell<br />
U dc ( t)<br />
U sb ( t)<br />
= ⋅ u stb ( t − Tv<br />
)<br />
2<br />
hvor Tv<br />
= Tsw<br />
/ 2<br />
1<br />
u sb ( t)<br />
= �u<br />
�dc<br />
⋅ u dc ( t)<br />
⋅ u stb ( t − Tv<br />
)<br />
2<br />
hvor Tv<br />
= Tsw<br />
/ 2<br />
PU-modell basert på svitsjetilstander<br />
1<br />
u sa ( t)<br />
= �u<br />
� dc ⋅ u dc ( t)<br />
3<br />
1<br />
u sb ( t)<br />
= �u<br />
�dc<br />
⋅ u dc ( t)<br />
3<br />
1<br />
u sc ( t)<br />
= �u<br />
� dc ⋅ u dc ( t)<br />
3<br />
⋅ ( 2 ⋅ d − d − d )<br />
⋅ ( 2 ⋅ d − d − d )<br />
⋅ ( 2 ⋅ d − d − d )<br />
■ Valg av basis-verdier basert på sammen basiseffekt i<br />
mellomkretsen som i motoren S n :<br />
U dn<br />
�u<br />
�dc<br />
= = 2 ⇒ U dn = 2 ⋅ Û n<br />
Û n<br />
3 În<br />
3<br />
U dn ⋅ Idn<br />
= 3/<br />
2 ⋅ Û n ⋅ Î n ⇒ Idn<br />
= = Î n<br />
2 �u<br />
�dc<br />
4<br />
au<br />
bu<br />
cu<br />
bu<br />
cu<br />
au<br />
cu<br />
au<br />
bu<br />
U dn<br />
u�<br />
� dc =<br />
Û n<br />
Mulige statorspennings romvektor…..<br />
s 2<br />
u s = ⋅ �u<br />
�dc<br />
⋅ u dc ⋅ e(<br />
t)<br />
3<br />
( ) ⎥ 1 ⎡2<br />
⋅ d au − d bu − d cu ⎤<br />
e(<br />
t)<br />
= ⋅ ⎢<br />
2 ⎣ 3 ⋅ d bu − d cu ⎦<br />
⎡2 u ν = ⎢ ⋅ �u<br />
�dc<br />
⋅ u dc<br />
⎣3<br />
π(<br />
ν -1)<br />
⎤<br />
,<br />
3<br />
⎥<br />
⎦<br />
for ν = 1,........ , 6<br />
u<br />
T<br />
= [ 0 , 0]<br />
for ν = 0,7<br />
ν<br />
T<br />
Trondheim 2000<br />
Trondheim 2000<br />
Trondheim 2000<br />
<strong>NTNU</strong><br />
<strong>NTNU</strong><br />
<strong>NTNU</strong><br />
Slide 278<br />
Slide 280<br />
Slide 282<br />
Modell basert på svitsjetilstander<br />
■ Modell basert på svitsjetilstander:<br />
1<br />
Usa<br />
( t)<br />
= ⋅ ( 2 ⋅ U a0<br />
( t)<br />
− U b0<br />
( t)<br />
− U c0<br />
( t)<br />
)<br />
3<br />
1<br />
Usb<br />
( t)<br />
= ⋅ ( 2 ⋅ U b0<br />
( t)<br />
− U c0<br />
( t)<br />
− U a 0 ( t)<br />
)<br />
3<br />
1<br />
Usc<br />
( t)<br />
= ⋅ ( 2 ⋅ U c0<br />
( t)<br />
− U a 0 ( t)<br />
− U b0<br />
( t)<br />
)<br />
3<br />
Up<br />
Um<br />
U a0<br />
( t)<br />
= U dc ( t)<br />
⋅ d au U b0<br />
( t)<br />
= U dc ( t)<br />
⋅ d bu U c0<br />
( t)<br />
= U dc ( t)<br />
⋅ d cu<br />
ÃÃÃÃÃÃ�Ã�����Ã<br />
���������������<br />
v Enable<br />
Udc+<br />
Udc-<br />
c1<br />
sw1_l4<br />
sw1_l4<br />
pwld<br />
sw1_l4<br />
pwld sw1_l4<br />
Udc<br />
( t)<br />
Usa<br />
( t)<br />
= ⋅ ( 2 ⋅ d au − d bu − d cu )<br />
3<br />
U dc ( t)<br />
Usb<br />
( t)<br />
= ⋅ ( 2 ⋅ d bu − d cu − d au )<br />
3<br />
U dc ( t)<br />
Usc<br />
( t)<br />
= ⋅ ( 2 ⋅ d cu − d au − d bu )<br />
3<br />
Sammenhengen mellom svitsjetilstander og<br />
statorspennings romvektor<br />
■ Pu-modell:<br />
1<br />
u sa ( t)<br />
= �u<br />
� dc ⋅ u dc ( t)<br />
3<br />
1<br />
u sb ( t)<br />
= �u<br />
� dc ⋅ u dc ( t)<br />
3<br />
1<br />
u sc ( t)<br />
= �u<br />
� dc ⋅ u dc ( t)<br />
3<br />
■ Settes inn i Park-transformasjonen med θ k=0:<br />
s ⎡2<br />
/ 3<br />
u s = ⎢<br />
⎣ 0<br />
s<br />
u sα<br />
= u sa<br />
pwld<br />
pwld<br />
⋅ ( 2 ⋅ d − d − d )<br />
au<br />
⋅ ( 2 ⋅ d − d − d )<br />
bu<br />
⋅ ( 2 ⋅ d − d − d )<br />
cu<br />
bu<br />
cu<br />
au<br />
−1<br />
/ 3 − 1/<br />
3 ⎤ S<br />
⋅ u s<br />
1/<br />
3 −1<br />
/ 3<br />
⎥<br />
⎦<br />
cu<br />
au<br />
bu<br />
sw1_l4<br />
sw1_l4<br />
pwld<br />
pwld<br />
U dn<br />
�u<br />
� dc =<br />
Û n<br />
S<br />
T<br />
u s = [ u u u ]<br />
sa<br />
sb<br />
Trondheim 2000<br />
s 1<br />
2 ⋅ u sb + u sa<br />
u sβ<br />
= ⋅ ( u sa − u sc ) =<br />
3<br />
3<br />
Spenningspådraget må være i statororienterte<br />
koordinater<br />
■ Arbeider regulatoren i dq-systemet eller et annet roterende<br />
koordinatsystem må pådraget transformeres til<br />
statorkoordianter:<br />
➨ Den fysiske omformer er koblet til de fysiske viklinger i<br />
stator<br />
■ Transformasjonen i kartesiske eller polare koordinater:<br />
k k s<br />
u st = �ss<br />
⋅ u st<br />
k ⎡ cos θ k sin θ k ⎤<br />
�ss<br />
= ⎢<br />
⎥<br />
⎣−<br />
sin θ k cos θ k ⎦<br />
s −k<br />
k<br />
u st = �ss<br />
⋅ u st<br />
−k<br />
⎡cos<br />
θk<br />
− sin θk<br />
⎤<br />
�ss<br />
= ⎢<br />
⎥<br />
⎣sin<br />
θk<br />
cos θk<br />
⎦<br />
sc<br />
Trondheim 2000<br />
Trondheim 2000