DKMD_4
-
Upload
tringuyenmdc -
Category
Documents
-
view
223 -
download
0
Transcript of DKMD_4
-
7/31/2019 DKMD_4
1/29
iu khin my in N N T B mn Thit b in
iu khin my in
Nguyn l iu khin vector gin tip
-
7/31/2019 DKMD_4
2/29
iu khin my in N N TB mn Thit b in
Gii thiu
Vic o t thng rotor bng cm bin t thng khng thct trong thng mi i hi phng php tnh ton gct thng
e r sl r sl dt dt
Gc t thng c tnh nh sau:
-
7/31/2019 DKMD_4
3/29
iu khin my in N N TB mn Thit b in
Gii thiu
S n gin ha
-
7/31/2019 DKMD_4
4/29
iu khin my in N N TB mn Thit b in
Gii thiu
Khi tnh wsl, isd c th c dng thay choimrd nu my hat ng vi t thng l hngs (v d, khng field weakening)
isq, isd s c dng trong vng iu khintrong vic so snh vi isq*, isd*.
Nu thng s ca my ng th wsl s chnhxc Rrthay i khi hot ng cnnhn dng Rronline
-
7/31/2019 DKMD_4
5/29
iu khin my in N N TB mn Thit b in
B iu khin vector gin tip
-
7/31/2019 DKMD_4
6/29
iu khin my in N N TB mn Thit b in
B iu khin vector gin tip
Nu khu field weakening c yu cu, thay th isd*
bng imrd trong khu tnh wsl
-
7/31/2019 DKMD_4
7/29
iu khin my in N N TB mn Thit b in
Khu b in p
rd = Loimrd
weLsisd v weLsisq l phnlin kt gia d v q
Bi tp: chng minh cng thc trn
= 1 Lo2/(LrLs)
-
7/31/2019 DKMD_4
8/29
iu khin my in N N T B mn Thit b in
Khu b in p
Thng thng,
c dng d iu khin hn, v th phi cng thm mt lngb. Cc gi tr lnh isd v isq c dng, Loimrd thay th cho rd
-
7/31/2019 DKMD_4
9/29
iu khin my in N N T B mn Thit b in
Cu hi (1/2)ng c dng thut ton iu khin vector gin tip IRFO
IRFO = Indirect Rotor Flux Orientation
Gi tr ca b trt trong b iu khin l gi tr thc ca my
a/ ng b/ Sai
Gi tr lnh ca b iu khin isq phi ging gi tr thc trong my
a/ ng b/ Sai
Gi tr isq c tnh bi b iu khin t cc gi tr dng gingvi gi tr thc isq trong my
a/ ng b/ Sai
Gi tr iu khin ca tn s kch thch s khng l tn s kchthch tht s trong my
a/ ng b/ Sai
-
7/31/2019 DKMD_4
10/29
iu khin my in N N T B mn Thit b in
Cu hi (2/2)ng c dng thut ton iu khin vector gin tip IRFO
Cc gi tr lnh isd* = 4A, isq* = 16A
real l gc t thng thc trong my v con l gc t thng ca b
iu khinNu c mt sai s hng con real = 15o. Vy gi tr thc trong my (isd, isq) s l
a/ (8.09A, 14.3A) b/ (0.173A, -16.48A) c/ (-0.173A, 16.48A)d/ (-8.09A, 14.3A)
Gi tr iu khin ca moment l 80Nm. Gi s rng cc thng s v hng smoment ca b iu khin l chnh xc, gi tr moment thc trong my l
a/ 3.56Nm b/ 80Nm c/ 2.85Nm
-
7/31/2019 DKMD_4
11/29
iu khin my in N N T B mn Thit b in
iu khin vector gin tip
*
*sl m r
s
qs r r
L RK
i L
*
e sl r
edt
HB: hysteresis-band
-
7/31/2019 DKMD_4
12/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin dqXt vng iukhin dq trongh thng iukhin PWM tipp (mu )
-
7/31/2019 DKMD_4
13/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin dq
B iu khin(cn thit k)
Hm truyn b
bin tn inverterng cB lc
Cn tnh cc thng s ki v ai t c p ng vng kn mong mun
-
7/31/2019 DKMD_4
14/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin dqI: hng s thi gian ca b bin tn
y l thi gian tr (delay) trc khi in plnh xut hin trn ng vo ng c. Nu tn sng ct l f
s
th c th gi s I
=1/fs
(thi gian1 chu k ly mu)
S: hng s thi gian stator ca ng c S=LS/RS
Thng thng S khong 5-20ms
I khong 100us
-
7/31/2019 DKMD_4
15/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin dqf: hng s thi gian ca b lcnhiu o lng
B lc chng nhiu anti-aliasing dng vi b
bin i AD. Nu dng c nhiu tn s fs, blc phi c tn s ct cut-off nh hn fs/2
Hng s thi gian stator c gi tr vt tri so vicc hng s khc
-
7/31/2019 DKMD_4
16/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: v dCho h thng:
RS=1, S=10ms. Thit k b iu khin PI c bngthng (tn s t nhin) 300Hz (1900 rad/s) v =0.8(h s tt dn)
Hm truyn vng kn:
Vi v
-
7/31/2019 DKMD_4
17/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: v dCho h thng:
RS=1, S=10ms. Thit k b iu khin PI c bngthng (tn s t nhin) 300Hz (1900 rad/s) v =0.8(h s tt dn)
Hm truyn vng kn:
n gin ha hm truyn
-
7/31/2019 DKMD_4
18/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: cht lng
vng iu khin dng in
Thi gian ln Trise Thi gian xc lp Tset
-
7/31/2019 DKMD_4
19/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin t thngVng iu khin dng tha imrd
Gi tr thi gian delay
(tr) ca r(100-150ms)ln hn nhiu so viisd(1-3ms)b quavng iu khin dng isd
B iu khin(cn thit k)
Vng iukhin dng isdn gin ha
Khu tnhdng im vir=LR/RR
-
7/31/2019 DKMD_4
20/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin t thng v dCho r=100ms, bng thngcn thit l 20Hz, =0.8
Phng trnh c tnh:
Ta c phng trnh c tnhca vng iu khin:
-
7/31/2019 DKMD_4
21/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin tc Vng iu khin tc cu vo l sai lch tc v u ra l gi tr lnh isq*
B iu khin(cn thit k) Vng iu
khin dng isqn gin ha(tng t
vng iukhin isd)
Khi c kh
B lc
J: moment qun tnh
B: h s ma st
B iu khin thng l PIDThng thng thng s b iukhin c xc nh bng cchth v sai (trial and error)
-
7/31/2019 DKMD_4
22/29
iu khin my in N N T B mn Thit b in
Thit k b iu khin: vng iu
khin tc - cht lngBng thng cc i b khng chbi:
-Lng moment c sn chngli qun tnh
-Qun tnh ca my
- phn gii ca encoder
Lc u wr=0 (t=0), gi tr lnh wr* dng hm
bc c p vo h thng
Sai s tc ln isq* ln isq b gii hn
Khi wr ln isq gim
Nu ti t nhin c a vo tc gimv isq tng cung cp thm moment
-
7/31/2019 DKMD_4
23/29
iu khin my in N N T B mn Thit b in
Cu hing c c cc thng s sau: Ls = 10mH, Rs = 1.2, LR= 80mH, RR= 0.8Tr li cc cu hi lin quan ti thit k b iu khin cho ng c ny
Thng s iu khin ca b iu khin dng dq cho cht lng
vng kn ti bng thng 400Hz, h s m =0.8a/ 350(s+1804)/s b/ 16.5(s+3850)/s
c/ 34(s+0.74)/s d/ 34(s+1857)/s
Thng s iu khin ca b iu khin t thng (u vo l sais ca dng imrd) cho cht lng vng kn ti bng thng 15Hz,
=0.8
a/ 14(s+65)/s b/ 34(s+18570)/s
c/ 6.5(s+137)/s d/ 15(s+59)/s
-
7/31/2019 DKMD_4
24/29
iu khin my in N N T B mn Thit b in
Tc ly mu Sample rates
Tn s t nhin ca cc vngiu khin v tm chn laca cc tn s ly mu
SFR Switching Frequency Ratio
SFR = fsamp/fbw
-
7/31/2019 DKMD_4
25/29
iu khin my in N N T B mn Thit b in
Tn s ly mu
Ts = 2ms ts = 250us
Cc gi tr lnh isd*, isq*, v wsl cp nht sau mi thi gian Ts
wsl c tch phn mi ts tnh gc rotor
-
7/31/2019 DKMD_4
26/29
iu khin my in N N T B mn Thit b in
Tra bng khi tnh sine, cosin
Khi chuyn h qui chiucn phi tnh cc gi trsine, cosin ca gc t thng
Tuy nhin vic tnh tonbng cch thng thngqu chm i vi ng dngrealtime.
Vic tra bng cc gi trsine, cosin s lm gim thi
gian tnh ton.
-
7/31/2019 DKMD_4
27/29
iu khin my in N N T B mn Thit b in
Encoder
Encoder c N xung mi vng
Trong khong thi gian tsencoder c N xung
wsl khng i trong thi giants v c tch phn cho rasl
Gc tng mt lng saumi ts
-
7/31/2019 DKMD_4
28/29
iu khin my in N N T B mn Thit b in
V d
ng c KB 4 cc, c iu khin bi 1 b iu khin RFOC.
Khi xc lp isq*=15A, isd* (=imrd) =5A.trtrong b iu khin bng 0.2
Vn tc trt ca ng c:
a/ 15 rad/s (in) b/ 15 rad/s (c)
c/ 7.5 rad/s (in) d/ 0.6 rad/s (in)
Nu gi tr thc ca trtrong my l 0.1, sai lch gc t thnggia my v b iu khin ():
a/ 15.3 b/ 30 c/ 11 d/ 7.6
-
7/31/2019 DKMD_4
29/29
iu khin my in N N T B mn Thit b in
Bi tpMt ng c hot ng xc lp vi fe=38Hz, in p statorVS=300V, is (pha) = 18A, v h s cng sut 0.86.
Cho
Ls = 0.01,Lo=0.08,Lr=0.085,isd*=6A
ng c c nh hng t thng rotor hay khng?