GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-C N MN HCTNG HP H THNG IN - CGing vin hng dn : ThS.NGUYN NG KHANGNhm Sinh vin thc hin: TN QUANG TON V VN TRINLp :IN 1Kha:3Khoa: CNG NGH K THUT INTn tiNGHIN CU H IU KHIN TC NG C KHNG NG B BA PHA ROTO LNG SC BNG PHNG PHP IU KHIN VECT TA T THNG ROTO (FOC)NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 1TRNG I HC CNG NGHIP HNB MN T NG HACng ha x hi ch ngha Vit Namc lp-T do-Hnh phcGVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CLi ni u Li ni uNgy nay,ng c in c s dng rng ri trong mi lnh vc ca i sng x hi,c bit l trong cc ngnh cng nghip sn xut hin i,v trong nhiu lnh vc i sng khng th thiu cc ng c in,v vy cc loi ng c in c ch to ngy cng hon thin hn,trong ng c in khng ng b 3 pha chim t l ln trong cc ngnh cng nghip do ng c khng ng b 3 pha c nhiu u im nh vic khi ng d dng,gi thnh r,vn hnh m,kch thc nh gn,lm vic chc chn,c tnh lm vic t,bo qun n gin,chi ph vn hnh v bo tr thp.tuy vy n c nhc im c tnh c phi tuyn mnh nn trc y, vi cc phng php iu khin cn n gin, loi ng c ny phi nhng ch cho ng c in mt chiu v khng c ng dng nhiu.tuy nhin vi s pht trin mnh ca ngnh khoa hc k thut ngy nay nh ngnh k thut vi x l,in t cng sut cng cc l thuyt iu khin, truyn ng th vic ng dng ng c khng ng b 3 pha l c ng dng rng ritrong h thng truyn ng iu chnh tc ca cc my sn xut, thay th dn ng c mt chiu.Trc y thng iu khin ng c bng cch iu chnh in p. y l mt phng php n gin nhng cht lng iu chnh k c tnh ln ng u khng cao. iu khin c chnh xc v hiu qu phi ni n phng php thay i tn s in p ngun cung cp. Do tc ng c khng ng b xp x tc ng b nn ng c lm vic vi trt nh v tn hao cng sut trt trong mch rto nh. Tuy nhin phng php ny cn phc tp v t tin. thit b dng bin i tn s l cc b nghch lu, c th l nghch lu trc tip hoc gin tip. Ta c th s dng b bin tn l mt thit b tch hp c chnh lu, nghch lu ln iu khin. Lut iu khin trong mi bin tn tu thuc vo nh sn xut.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 2GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CHin nay iu khin ng c c nhiu bin tn bn sn trn th trng, t khi cn phi thit k theo phng php kinh in na. Cc nh sn xut la chn bin tn nhiu hn bng iu khin sao - tam gic hoc in tr ph hoc cc thit b iu khin khc v n gn nh, iu khin chnh xc, tin cy, p ng c nhu cu t ng ho v tng bc hin i ho x nghip ca h. Bin tn n gin thng iu khin tc theo lut U/f m bo ng c sinh mmen tt nhng cho cc h truyn ng yu cu cao hn th c bin tn iu khin theo vect ta t thng roto (foc).Mc ch ca nTuy hin nay cc loi bin tn c by bn v s dng rng ri trn th trng ca cc hng Toshiba, Omron, Siemens ... vi nhiu phng php iu khin khc nhau nh : theo lut U/f khng i, iu khin vect ta t thng roto.. nhng vic tm hiu chn ra mt phng php thch hp hoc nghin cu tm ra mt phng php iu khin mi sao cho ti u v gi thnh, chnh xc, tin cy th vn cn nhng tranh lun v mi loi u c u nhc khc nhau.Bn n ny ca chng em xin c trnh by r hn v phng php bin tn s dng lut FOC (iu khin vecto ta t thng roto) bao gm cc phn chnh sau:- Xy dng c s l thuyt thut ton FOC- M phngbng Matlab nh gi p ng h thng bin tn dng thut ton iu khin FOC chng minh vic ng n ca cng vic mnh ang lm- i nh gi u nhc im bin tn s dng lut FOC v cng nh v tr ng dng ca n.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 3GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CLI CM Nu tin em xin chn thnh gi li cm n su sc ti cc thy c gio trong khoa in c bit l thy gio NGUYN NG KHANG,gio vin khoa in trng I HC CNG NGHIP H NI ngi trc tip ging dy v cho chng em kin thc hon thnh n mn hc ny.L mt k s in tng lai chng em hiu r tm quan trng ca ng c khng ng b 3 pha roto lng sc trong cng nghip,qu trnh sn xut v cng nh tm quan trngca vic iu khin tc n,trongcphngphpiu khin theo vect ta t thng roto (foc).Do kin thc c hn cng nh cha c kinh nghim thc t nn bn n ny ca chng em khng trnh khi nhng thiu st,em knh mong thy gio xem xt v gp chng em hon thnh n ny c tt hn sau ny.Em xin chn thnh cm n thy gio!H ni,ngy 23/12/2011.Nhm sinh vin thc hinTN QUANG TONV VN TRIN NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 4GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CLI NHN XT CA GIO 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TN QUANG TON V VN TRIN- LP 1K3 Page 5GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-C................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................I. XY DNG C S L THUYT THUT TON FOCI.1.VI NT S LC V NG C KHNG NG B ROTO LNG SCI.2. CC PHNG PHP IU KHIN TC NG C KHNG NG BI.3. XY DNG C S L THUYT THUT TON FOCI.3.1.GII THIU CHUNG V FOCI.3.2. C S L THUYT THUT TON FOCI.3.2.1. M T TON HC NG C KHNG NG B 3 PHAI.3.2.2. PHP BIN I KHNG GIAN VECTOI.3.2.3. H PHNG TRNH C BN CA NG C TRONG KHNG GIAN VECTOI.3.2.4. CU TRC H THNG IU KHIN VECTO NG C KHNG NG BI.3.2.5. TNG HP CC B IU CHNHI.3.2.6. QUAN ST T THNG1.3.3. CU HNH IU KHIN FOCII. M PHNG BNG MATLAB NH GI H THNG BIN TN DNG THUT TON IU KHIN FOC2.1.M PHNG BNG MATLAB2.2.NH GI H THNG BIN TN DNG THUT TON IU KHIN FOCNSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 6MC LCGVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CIII.NH GI U NHC IM BIN TN S DNG LUT FOC V V TR NG DNG3.1.U IM CA FOC3.2.NHC IM CA FOC3.3.V TR NG DNG CA FOCI.XY DNG C S L THUYT THUT TON FOC 1.1.VI NT S LC V NG C KHNG NG B ROTO LNG SC Ta i tng quan v ng c khng ng b l loi my in xoay chiu hai dy qun trong ch c dy qun stato(dy qun s cp) nhn in t li vi tn s fs, dy qun rto(dy qun th cp) c ni ngn mch (hoc c khp kn qua in tr). Dng in trong dy qun rto c ly cm ng t pha dy qun stato, c tn s fr v l hm ca tc gc rto r. So vi ng cmt chiu, ngckhngngbcuimvmt cutovgi thnh,lm vic tin cy v chc chn. Khuyt imchnh cu ng c KB l c tnh m my xu v khng ch cc qu trnh qu kh khn hn so vi ng c mt chiu. Trong thi gian gn y, vi s h tr ca mt s nghnh khoa hc khc nh: in t cng sut, k thut vi x l ... lm tng kh nng s dng i vi ng c khng ng b ngay c trong nhng trng hp c yu cu iu chnh t ng tc trong di rng vi chnh xc cao m trongcchtruynngtrcyvnthngphi sdngngcmt chiu. ng c khng ng b 3 pha l my in xoay chiu,lm vic theo nguyn l cm ng in t,c tc ca roto khc vi tc t trng quay trong my.ng c khng ng b 3 pha c dng nhiu trong sn xut v sinh hot v ch to n gin,gi r, tin cy cao,vn hnh n gin,hiu sut cao,v gn nh khng bo tr.di cng sut rt rng.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 7NHM 35GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-Cng c khng ng b 3 pha chia thnh: ng c khng ng b 3 pha roto lng sc ng c khng ng b 3 pha roto dy qun y ta tp trung vo nghin cu v ng c 3 pha roto lng scHnh nh v rotor lng sc:NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 8GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CL thp ca rotor v stator:Cc thanh nhm c gn trn rotor (thnh dng "ci lng nht con sc" nn gi l "lng sc"):1.2.CC PHNG PHP IU KHIN TC NG C KHNG NG B Ta c t phng trnh momen ca ng c : ] )'[('32 2 21 1221XSRR wSRUMnm + + ta c th da vo iu khin moomen bng cch thay i cc thng s nh in tr ph,tc trt,v tn s ngun cp. iu khin in p statorNSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 9GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CDo momen ng c khng ng b t l bnh phng in p stato,do c th iu chnh c momen v tc khng ng b bng cch iu chnh in p stato trong khi gi nguyn tn s.y l phng php n gin nht.ch s dng mt b bin i in nng (bin p,triristor) iu chnh in p t vo cc cun stator.phng php ny kinh t nhng c tnh c thu c khng tt,thch hp vi ph ti my bm,qut gi. iu khin in tr rotoS dng trong c cu dch chuyn cu trc,qut gi,bm nc;bng vic iu khin tip im hoc trisistor lm ngn mch/h mch in tr ph ca roto ta iu khin c tc ng c,phng php ny c u im mch in an ton,gi thnh r.nhc im:c tnh iu chnh khng tt,hiu sut thp,vng iu chnh khng rng. iu chnh cng sut trtTrong cc trng hp iu chnh tc ng c khng ng b bng cch lm mm c tnh v nguyn tc khng ti l tng th cng sut trtps= pt c tiu tn trn in tr mch roto. cc h thng truyn ng in cng sut ln,tn hao ny l ng k.v th va iu chnh c tc truyn ng in,va tn dng c cng sut trt ngi ta s dng cc s cng sut trt (s ni tng / ni cp)P1 = Pc + Ps = P1(1 s) +sP1 = const.Nu ly Ps tr li li th tit kim c nng lng-khi iu chnh vi 1 (s 0)Tng v tch hai nghim p1, p2 c rt ra t phng trnh trn:p1+p2= a11+ a22v p1.p2= a11. a22 - a12. a21(2-33)C th suy ra cp1+p2=k(p1+p2) v p1+p2=k2(p1.p2)T (2-32) v (2-33) suy ra:a11+ a22 =k.(a11+a22) a11.a22 =k2.(a11.a22) (2-34)Phng trnh th nht ca (2-34) tng ng:

,_

+ +

,_

+ + ++ + +22 11 122122 22 1122 6 11 2 1225 122 22 1 11.r rr rr rr ra a aa a aka g a g ag a a g ang nht tng phn t ca hai ma trn hai v ta c:ar11 +g1+ ar22 = k(ar11 + ar22)-a122 +g5 = k(-a122) a122 +g2 = k(a122) ar11 +g6+ ar22 = k(ar11 + ar22)T 4 phng trnh rt ra kt qu:g1= g6 = (k-1)(ar11+ar22) (2-35)g2 = -g5 = (k-1)(-a122)Phng trnh 2 ca (2-34) tng ng:NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 47GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-C

,_

+

,_

+ + + + + ++ + + + + + + +21 12 22 11 21 112 122 1121 112 122 11 21 12 22 11 28 21 12 7 112 22 6 11 2 122 4 12 3 21 112 122 6 11 2 228 21 112 7 12 5 22 122 1 11 4 112 3 21 12 122 5 22 1 11.) ( ) ( ) ( ) () ( ) ( ) ( ) (r r r r r rr r r r r rr r r r r r r rr r r r r r r ra a a a a a a aa a a a a a a akg a a g a a g a g a g a g a a a g a g ag a a g a g a a g a g a g a a a g a g an y li s dng phng php ng nht ma trn nh lm trn ta c: ) ( ) ( ) () ( ) ( ) (21 112 122 1124 12 3 21 112 122 6 11 2 2221 12 22 1124 112 3 21 12 122 5 22 1 117 48 35 26 1r r r r r rr r r r r r r ra a a a k g a g a a a g a g aa a a a k g a g a a a g a g ag gg gg gg g + + + + + + + (2-36)Kt hp (2-35) trong khi gii h gm phng trnh 3 v 4 ca (2-36):) ( ) ( )] )( 1 ( [ ) 1 () ( ) ( ) 1 ( )] )( 1 ( [21 112 122 1124 12 3 21 112 122 22 11 11 22 12221 12 22 1124 112 3 21 122122 22 22 11 11r r r r r r r rr r r r r r r r r ra a a a k g a g a a a a a k a a a ka a a a k g a g a a a k a a a k a + + + + + + + +H trn tng ng: ) ( ) 1 ( ) 1 () ( ) 1 ( ) 1 (21 112 122 1124 12 3 112 21 112 122 22 122 11 22 12221 12 22 1124 112 3 12 21 122122222 22 11r r r r r r rr r r r r r r r r ra a a a k g a g a a a a a k a ka a a ka a a a k g a g a a a a k a k a ka + + + +Rt gn: 122 22 21 1122122 1124 12 3 1122122222 21 12222 1124 112 3 12) 1 ( 2 ) 1 ( ) () )( 1 ( ) 1 ( ) (a a k a a k a a k k g a g aa a k a a k a a k k g a g ar r r rr r r r r r + (2-37)T (2-37) ly (pt 1)*ar12 +(pt 2)*a112 c phng trnh :) ( ) 1 ( ) 2 )( 1 ( ) ( ) ( ) (2112212 212112 122 22 122122 12222 122 112 12 22 11232112212a a a ka a a a a a a k a a a a a k k g a ar rr r r r r r r r+ + + + Xt cc nh ngha: J a I a J ITAJ a I a J IT LAr rrr rr m122 22 22112 12 1211 1+ + +

,_

Nhn thy nu t c = Lm/(1-) th ar22 = - c.ar12, a122 = - c.a112 NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 48GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CThay vo phng trnh trn c:) )( 1 ( ) )( 1 () 1 ( ) 1 ( ) () ( ) 1 ( ) 2 ( ) 1 ( ) ( ) ( ) () ( ) 1 () 2 ( ) 1 ( )) ( ) (( ) ( ) (22 11 21 112321212211232112212 21221222122222 122112212 112321122122112212 212112 1222122222 12 112 112 12 12 11232112212r r r rr r rr rr r r r rr rr r r r r ra a k c a ca k ga k a c k ca k k ga a a ka a a a k a a a k k c g a aa a a ka ca a a a k ca a a ca a k k g a a+ + + + + + + + + Thay tr li g3 vo phng trnh th 2 ca (2-37) c:122 421 1122122 1124 12 212122112112) 1 () 1 ( ) ( ] ) 1 ( ) 1 ( ) ( [ca k ga a k a a k k g a a k a c k ca k k ar r r r r r + + Vy ta tm c ma trn GTg g g gg g g gG1]1

3 4 1 24 3 2 1Trong :g1 = (k-1)(ar11+ar22)g2 = (k-1).a122g3 = (k2-1)(c.ar11+ ar21) -(k-1)c(ar11+ ar22)g4= - c(k-1)a122NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 49GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CXY DNG CU HNH IU KHIN FOCu tin, ta c mt ci ng c khng ng b, mt b bin i in t cng sut (nghch lu s dng IGBT hoc MOSFET) v khu iu ch xung PWM.

Ta tin hnh o dng in isa, isb, isc, cho qua khu bin i (ma trn Clack transform) abc/- to thnh 2 dng is v is.Sau cho qua khu quay trc ta (ma trn Park transform) - /d-q to ra 2 dng isd v isq.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 50GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-C By gi, ta tm vng dng in m i ra vng ngoi cng: vng iu khin tc v vng iu khin t thng. . Ta s c cm bin tc a v tn hiu phn hi tc ng c, c lng t tc *, c khu gim t thng vi nhim v gi nguyn t thng nh mc di tc c bn v gim t thng di tc cao, u ra l lng t t thng r*.Lng t tc * v lng t t thng r* so snh vi tc phn hi v t thng r, qua b iu khin tc v iu khin t thng (thng l cc b PI) to thnh lng t dng in isd* v isq*. ( phn hi t cm bin tc , cn r c ly t khu c lng t thng s ni sau).NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 51GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CLng t dng isd* v isq* c so snh vi dng phn hi isd v isq m ta c c, cho qua b iu khin dng in (thng l PI) to ra tn hiu in p t usd* v usq*. NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 52GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CTn hiu in p t usd* v usq* ny c cho qua h thng chuyn ta ngc d-q/- ri - /abc to ra tn hiu t usa*, usb*, usc* a vo khu iu khin in t cng sut PWM (iu ch sng mang tam gic hoc iu bin khng gian vector) pht xung cho mch lc nghch lu, cp in cho ng c quay.Nu b iu khin dng in ta khng dng PI m dng iu khin di tr (Hysteresis Current Control - HCC) th tn hiu sau b iu khin c a thng vo nghch lu ng ct van. Thc t th HCC cng l mt phng php PWM ch khng ch c iu ch sng tam gic v iu bin khng gian vector. c t thng rotor ta khng o c m cn phi c lng n s dng mt b c lng t thng. Cng thc c th cc anh xem trong ti liu. c c gc theta (sin cos ca n) s c 2 phng php, t chia FOC NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 53GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-Cthnh 2 loi: iu khin FOC trc tip (Direct Vector Control) v gin tip (Indirect Vector Control). iu khin FOC trc tipNSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 54GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-Ciu khin FOC gin tipII.M PHNG BNG MATLAB NH GI H THNG BIN TN DNG THUT TON IU KHIN FOCII.1. M PHNG BNG MATLABTa s dng m SimpowerSyrtem vi cc sn phn MathWorks khc cng vi hng dn c sn trong phn mm m Ta vo matlap ri m simulink chnsimpowersystem ly cc khi vo ni chng atlap m phng p ng ca h thng bin tn thut ton iu khin FOC. li nh hnh :Cc u vo thut ton c m phng s dng khi ngun Simulink. thay th cho cc tn hiu u vo trong thut ton ny, chng ta s dng cc bin s im NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 55GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-Cc nh ly trong th vin c28xdmlib ca simulink vi cc thng s bnh thng, nh khi DMC ch i tn hiu thay i t 0-1 l gc m ca in thay i t0 n 2 *pi. V vy , tn hiu v tr l mt chuyn i bnh thng m chng ta c th chng t bng cch s dng Q17 nh dng c nh im. Cc u vo Ia v Ib i din cho cc dng giai on A v B.Khi pass Thought Control l mt subsysterm c xy dng vi m hnh.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 56GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CVi cc thng s ci t u vo nh sau:Khi ngun Ia:NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 57GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CKhi ngun Ib:NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 58GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CKt qu m phng ta thu c cc dng song vi cc thng s trn nh sau.Dng sng u ra.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 59GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CDng theo trc Q,DNSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 60GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CDng sng u vo:NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 61GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CBy gi ta c th quan st s thay i ca dng sng khi thay i cc yu t u vo m phng trn h thng PMSM kim sot. Tng bin ca Ia v Ib ln. C th tng gi tr Number of offset samples ca Ia ln 12500,tng gi tr Number of offset samples ca Ib ln 12500-20000/3.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 62GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CCc dng sng thu c ln lt l.Dng sng u voNSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 63GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CDng u ra.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 64GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-CDng sng theo truc Q,D.nh gi p ng ca thut ton iu khin FOC. H thng n nh. Sai s xc lp tc nh, sai s xc lp ca t thng rto ln. Thi gian p ng ca h thng tng i nhanh. Mmenet ti khng tc ng nhiu n p ng ca tc , v p ng ca t thng roto.NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 65GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-C Cht lng p ng suy gim khi b nhiu tc ng ln tn hiu hi tip. H thng d mt n nh khi c sai s m hnh hay b tc ng ca nhiu. Dng in khi ng ln so vi dng lm vic, dng khi ng tng ln khi c sai s m hnh.3. Kt lun.V c bn n ca ta hon thnh: gii quyt c khu then cht ca n, khu then cht thit k thut ton iu chnh dng trong h TXCBP theo nguyn l iu chnh ta t theo t thng rotor T4R. V c bn khu iu chnh dng c chia lm 2 h chnh.+ Mt h hot ng trn c s x l vector sai lch iu chnh (mc 7.1) v (mc 7.2) .+ Mt h hot ng trn c s hi tip vector trng thi.Kinh nghim thc t cho thy: Khu iu chnh dng hot ng trn cs iu chnh vector sai lch iu chnh hot ng vi tin cy rt cao, ngay c khi cc thng s iuchnh km chnh xc (v d nh: tham s ch c tnh t nhn my ch khng c xc nh thng qua o lng). u im c th cho khu tr thnh gii php chun cho loi bin tn van nng phi hot ng tt iu kin ng c t quen bit . Ngc li khu iu chnh trng thi (khng phn tch trong n) kh nhy vi sai lch tham s iu chnh. Nu c cung tham s mt cch chnh xc khu cho php t c mt vi ch tiu cht lng cao hn khu trn v v th c th s dng c li trong h thng cht lng cao ni m ph tn ph khng ng k.Trong h TXCBP c cc khu iu chnh vng trong v vng ngoi khu iu chnh vng trong ta s dng song. Sau y ta xy dng cc b iu chnh NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 66GVHD:ThS.NGUYN NG KHANG N MN TNG HP H THNG IN-Cvng ngoi cng cc gii php i theo da trn c s iu chnh vng trong - iu chnh dng (CD). NSVTH: TN QUANG TON V VN TRIN- LP 1K3 Page 67