bai giang tu dong hoa trong he thong dien 21-11-2011
TRANSCRIPT
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T NG HA
TRONG H THNG INB mn H hng in
11/21/2011 Ging vin: Nguyn Xun Tng & Nguyn Th Anh
i hc Bch Khoa H Ni
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T ng ha h thng in GS. Trn nh Long
2
Gio trnh
Automation in ElectricalPower Sstems A. Baram
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Automatic Power SstemControl V.A. Venikov
3
Gio trnh
Power Sstem Stabilit andControl P. Kundur
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Operation and Control inPower Sstems P. S. R Murt
4
Gio trnh
Control and automation ofelectric power distributionsstems J. Northcote
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Kha hc online ti trang web ca NPTEL
Trang ch:http://nptel.iitm.ac.in/
Trang vPower Systems Operation and Control:http://14.139.160.11/video.php?courseId=1023
hoc trn Youtube:
5
Gio trnh
p: www.you u e.com user np e r
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Chng m u: Gii thiu chung v t ng ha trong HT vcc vn lin quan
Chng 1: T ng ng li cc ngun in
Chng 2: T ng chuyn i ngun in
6
cng mn hc
Chng 4: T ng sa thi ph ti theo tn s
Chng 5: T ng iu chnh in p & cng sut phn khngtrong HT
Chng 6: T ng iu chnh tn s & cng sut tc dng trongHT
Chng 7: T ng ha li in phn phi v t ng ha trm
bin p
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Gii thiu chung
Chng m u
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S cn thit ca vic t ng ha trongHT
Cc qui tc v bn v dng trong t ngha
Cc k hiu thng dng
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Cc loi s c trong HT:Din bin nhanh, d lan rng
Khng loi tr nhanh: gy tc hi nghim trng
Do thi gian rt ngn nn bt buc phi c cc thit b t ng pht hinv x l cc trng hp ny
Nhiu thao tc t ng d gy nhm ln: my t ng s lm
8
S cn thit ca vic t ng ha
tt hn con ngi, loi tr c cc sai st, tng chnh xc. My t ng cho php theo di lin tc v kp thi iu chnh
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Cc loi s :S khi:
Th hin chc nng ca cc phn t Mi lin h gia cc phn t ny
Trnh t hot ng ca c cu c thit k
9
Cc qui tc dng trong bn v
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Cc loi s :S khai trin
Khng v y cc phn t m th hin chi tit mi lin h, trnh tvn hnh gia chng
S khai trin mt chiu (dc); S khai trin xoay chiu (ac); S mch tn hiu, chiu sng...
10
Cc qui tc dng trong bn v
Thch hp cho mc ch sa cha, u ni dy gia cc phn t
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S tng hp: th hin y cc phn t ca s Th hin c trnh t lm vic ca cc phn t
S phc tp, kh theo di
Vi cc c cu n gin c th dng loi s ny Vi cc c cu phc tp: dng thm cc s khai trin
11
Cc qui tc dng trong bn v
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S biu din c v trng thi khng in:My ct trng thi m
Cun dy rle khng mang inC ghi ch vi cc trng hp c bit
12
Cc qui tc dng trong bn v
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Mt s k hiu thng gpTip im my ct
Tip im trng thi m:
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K hiu dng trong bn v
Tip im trng thi ng
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Mt s k hiu thng gpTip im rle:
Tip im trng thi thng m
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K hiu dng trong bn v
Tip im trng thi m, m chm
Tip im trng thi m, ng chm
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Mt s k hiu thng gpTip im rle:
Tip im trng thi thng ng
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K hiu dng trong bn v
Tip im trng thi ng, m chm
Tip im trng thi ng, ng chm
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Mt s k hiu thng gp
Cun dy:
16
K hiu dng trong bn v
C Cc U I
Cun ngmy ct
Cun ctmy ct
Cunin p
Cun dngin
Rle dng in: RI Rle in p RU
Rle thi gian: RT
Rle trung gian: RG Rle trung gian hot ng c tr: RGT...
Cc phn t trn s c nh s th t d phn bit: 1BU; 2BU; 3RI; 4RI; 5RT; 6RG; 7RGT...
Tip im ca rle c nh ch s
1RT1; 1RT2 hoc 1RT1; 1RT2 hoc 1RT1; 1RT2... 4RG
1
2
3
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17
V d
Tn hiu
S bo v qu dng vi bin dng in t trn hai pha(p dng cho li in c trung tnh cch in)
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18
V d
Trnht
c
Mch khai trin in xoay chiu
Mch tnhiu
Mch khai trin in mt chiu
s
1: T ng ng li cc ngn in
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T ng ng li cc ngun in
Chng 01
19
1: T ng ng li cc ngn in
Chng 2: T ng chuyn i ngun in
Chng 3: T ng ha ng b cc ngun in
Chng 4: T ng sa thi ph ti theo tn s
Chng 5: T ng iu chnh in p & cng sut phn khng trong HT
Chng 6: T ng iu chnh tn s & cng sut tc dng trong HT
Auto Reclose (AR) hoc 79
T ng li (TL)
79
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S liu thng k i vi ng dy trn khng:8090%h hng: s c thong qua
Ngng 80% Li 6110kV
Ngng 90% Li t 220kV tr ln
1020% cn li: s c duy trv bn duy tr
Do vy:
20
L do s dng thit b TL
Trong a s cc trng hp: c th cho php ng li ng dy sau sc v xc sut thnh cng s ln
S dng thit b TL: lm nhim v t ng ng tr limy ct ngdy sau mt khong thi gian c ci t trc Nhanh chng khi phc li vic cung cp in Nng cao c tnh n nh ca h thng so vi khi khng c TL (ng dy b ct in
ko di, gim kh nng lin kt truyn ti gia cc khu vc)
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S c thong qua:Nguyn nhn gy nn s c c th t loi tr
Phng in tm thi b mt s do st nh
Cy ci chm vo ng dy do gi to...
S c bn duy tr:
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L do s dng thit b TL
Nguyn nhn gy s c c th b loi tr sau khih quang chy vi ln
Vt l ri vo ng dy c th b h quang t chysau khi ng ct li ng dy vi ln
S c duy trNguyn nhn gy ra s c khng th t loi tr
t dy, nt v s, qun tip a ng dy...
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Theo s ln t ng li:TL mt ln: thng p dng cho li in t 220kV tr ln
TL hai ln: p dng cho cp in p t 110kV tr xung
ng li nhiu ln nh hng xu n tnh n nh ca h thng
Xc sut thnh cng thp (
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Theo s pha thc hin TLTL 3 pha:dng cho cp in p t 220kV tr xung
TL 1 pha:dng cho cp in p 500kV Khi s c pha no: ct v TL ring pha H thng rle phi c chc nng la chn pha s c
My ct: c b truyn ng ring tng pha
23
Phn loi thit b TL
TL 1 pha dng cho li 500kV: ch yu l s c mtpha
Cc thit b l loi mt pha: bin p mt pha
Khong cch phapha lnKhi ct pha s c th hai pha cn li vn hot ng:
gi c lin kt gia cc phn ca h thng mbo tnh n nh (yu t quan trng)
TL mt pha khng thnh cng: ct c 3 pha
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Theo thi gian thc hin t ng li:TL nhanh (Rapid AR): thi gian TL rt ngn (0.351 giy) thng ch
m bo thi gian kh ion
m bo nhanh chng cung cp in tr li Gim thiu mc mt ng b khi cn ng li gia hai ngun in
Gim nh s mt n nh.
24
Phn loi thit b TL
TL c t i gian De ae AR: t i gian TL c o i m onguyn nhn gy s c c th c loi tr hon ton. Khi cc phn caHT c lin kt bi nhiu ng dy th c th p dng TL c tr.
Thc t: m bo xc sut thnh cng: Ln 1: tTL= 0.32 giy
Ln 2: tTL= 1015 giy
Ln 3: tTL= 15 pht
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Theo cp in p thc hin t ng li:TL cp trung p: mc tiu ca TL l gim thiu thi gian mt in
TL cp cao p: mc tiu chnh l m bo tnh n nh ca h thng.
25
Phn loi thit b TL
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Thit b TL phi m bo ng s ln tc ng:Trnh trng hp ng vo im s c nhiu ln c th gy h hng
my ct v nh hng xu n h thng
TL phi m bo lun khi ng ng vi mi trng hp sc: m bo tin cy ca thit b TL
26
Cc yu cu i vi thit b TL
Khng tc ng ng li i vi my bin p, my pht, thanh gp trnh vic s c lan rng Bo v chnh ca my bin p (BV so lch, rle hi..) hot ng: chc chn s
c trong MBA Khng nn thc hin TL. Trong trng hp ny thng c
nhn vin vn hnh ra khu vc MBA kim tra bng mt v i lnh ca iu cp trn
Khi ct my ct bng tay: c ch tch ng dy ra khi vn hnh(bo dng, thay th..) khng c TL
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Thit b TL phi c kha trong mt s trng hp:Khi ng my ct bng tay nu MC li ct ra ngay: cn s c trn
ng dy cha c pht hin (vd: qun cha tho tip a ng
dy..) Khng nn t ng li. Khi ph ti b ct ra do vic sa thi ph ti theo tn s
Khi bo v chng hin tng my ct t chi tc ng lm vic
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Cc yu cu i vi thit b TL
Trong mt s trng hp thit b TL c th b kha khi dng s cqu cao (s c gn). Vic pht hin s c gn c th thc hin bngcch t thm chc nng bo v qu dng mc cao.
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Thit b TL phi c kha trong mt s trng hp:Khi xy ra dao ng in: nu my ct b ct ra do hin tng dao
ng in th nn kha TL n khi no h thng tr v trng thi n
nh.Vi li phn phi: khng nn TL nu trn ng dy vn cn in
in p trn ng dy vn cn duy tr mt khong thi gian ngn do cc
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Cc yu cu i vi thit b TL
Nu TL ngay khi in p ny cha gim hn: c th xy ra vic ng khngng b gy nguy him cho ng c
Vi ng dy cao p v siu cao p: kha TL khi s c 3 pha Him khi khi xy ra s c 3 pha
Nu xy ra s c 3 pha: thng khng phi s c thong qua (qun tip a ding ground straps)
Nn kha Tl trong trng hp ny
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Mc ch: ch cho php TL khi ng khi c yu cu
S khi ng thay i ty theo hng sn xut, tuy nhin phng phpchung l da vo (theo khuyn co ca tiu chun IEEE Std C37.104):
Khi ng bng thit b bo v rle Khi ng bng tip im ph ca my ct
29
Cc phng php khi ng thit b TL
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Khi ng bng hi b bo le Khi c s c trn ng dy, thit bbo v rle hot ng s:
a tn hiu ng MC
Khi ng thit b TL
30
Cc phng php khi ng thit b TL
Ngun
BV
CtKhi ng
TL
S n gin, m bo TL khi ng vi mi trng hp ng dy b ct rado s c
Khi ct MC bng tay: TL khng khi ng (ng)
Khi ng MC bng tay, nu c s c trn ng dy, MC ct ngay ra: TL s hotng Vi cc thit b TL hin i Cm TL khi ng my ct bng tay:
Khi c tn hiu ng MC bng tay (tip im ph) >> a tn hiu vo rle kha tm thi chc
nng TL >> chc nng TL s c gii tr sau khi MC trng thi ng trong khong thi
gian di no .
C h h khi hi b
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Khi ng bng ip im ph m c & kha i khin TL li s c khi ng bt c khi no c gia ng hi hc ca MC
(th hin qua tip im ph 52b) v ng hi ca kha i khinmy ct
Tip im 52b: s ng khi MC trng thi m
Tip im ca kha iu khin (slip contact) s m ra khi MC c m bng tay v ng li khiMC c ng bng tay
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Cc phng php khi ng thit b TL
My ct
-+
c im Khi ng dy gp s c MC ct ra: tip im ph MC ng + Tip im kha K
ang ng >> Khi ng TL
Khi ng/ct MC bng tay: tip im ph MC v tip im ph kha K cng v tr>> khng khi ng (ng)
52b
Rle
TL
C h h khi hi b TL
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32
Cc phng php khi ng thit b TL
Kha iu khin
T iu khin ngn l
My ct ngoi trm
C i l thi i t t h TL
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33
Cc i lng thi gian trong qu trnh TL
Tip im chnh ri nhauDng in chy qua tip imdp hquang
1
Tip im dp hquang tch riHquang xut hin
2
Hquang bdp tt
3
Tip im vtr mhon ton
4
Qu trnh ct my ct (my ct GL314 Areva)
C i l thi i t t h TL
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Cc i lng thi gian trong qu trnh TL
Bov
Scxuthin
Thi gian lmvic ca bo v
Bo vtcng
Bo vtrv
My ct
Hquangtn ti
c cp
in
tch ri
Hquangxut hin
bdp tt
mhon
ton
ng
c cpin
chmnhau
Tip imng hon
tonThi gian cht (khng in)
Thit bTLTL ckhi ng
TL gixung ng
di xung ngThi gian cht ca TL
Thi gian sn sng (gii tr)
Sn sng cho ln
sctip theo
Cc i lng thi gian trong qu trnh TL
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Thi gian lm vic ca bo v:t khi bo v khi ng >> pht tn hiu ctMC.
Thi gian ct MC:cun ct mang in >> h quang dp tt
Thi gian tn ti h quang trong MC:cc u tip xc chnh ca MC ri nhau
35
Cc i lng thi gian trong qu trnh TL
(h quang pht sinh) >> h quang b dp t t.
di xung ng ca TL:l khong thi gian tip im u ra ca thit bTL cn gi trng thi ng
Thi gian ng ca MC:cun ng MC mang in >> tip im chnh MCchm nhau
Cc i lng thi gian trong qu trnh TL
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Thi gian kh ion:l thi gian cn thit khng kh xung quanh im s ckhi phc li mc cch in cn thit (cc ion tn mt) m bo hquang khng pht sinh tr li khi cp in cho ng dy. Cc yu t quytnh:
Cp in p > cun ng mang in
Thi gian sn sng:thit b TL gi tn hiu ng >> sn sng cho ln s c
tip theo Thi gian cht (thi gian khng in):h quang b dp tt >> tip im chnh
MC tip xc tr li
Thi gian nhiu lon:s c pht sinh >> MC ng li thnh cng
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Tnh on ci hng
Tnh ton ci t thng s
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ng d m ngn cp (TL 3 pha): TL ln h nh: TLchn heo 2 i kin iu kin kh ion:
Theo iu kin sn sng cho ln lm vic k tip ca b truyn ng MC (cng l xo,phc hi p sut kh...):
Chn theo gi tr ln nht tnh c t hai iu kin trn
38
Tnh ton ci t thng s
(1)( ) (1)TDL at khu ion d MC t K t t =
(2)(2)TDL at san sangt K t=
1 (1) (2)ax
lant m t t =
m bo s thnh cng ca TL th thi gian TL ln th nht c th c c kodi 25 giy (35kV)
TL ln h hai: chn heo gi ln nh ca
Ty theo kh nng dp h quang ca MC nu gp s c trong ln ng ny Theo iu kin kh kh ion
tTL> tkhi phc kh nng ct
tTL> tkh ion tng MC
Tnh ton ci t thng s
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ng d hai ngn cp (TL 3 pha):
Thi gian lm vic ca cc bo v:t
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ng d hai ngn cp (TL 3 pha):
40
Tnh ton ci t thng s
HT1 HT2
TL2TL1
BV1 BV2
U2>
MC1 MC2
U145%) H thng b chia tch
Trnh tn stn ti lu ngng thp
1 05( )
.I
P P= TCT max 0 4 0 5( ) ( )( . . )II IP P TCT TCT
Thi gian t ging nhau
1 2 3
( ) ( ) ( )...
I I It t t= =
Thi gian t khc nhau
1 2 3
( ) ( ) ( )...
II II IIt t t
46.5Hz 48.5Hz
(bc 0.1Hz )
0.1 0.15 giy
48.5Hz
5 40 giy (max 90 giy)
cch nhau 3 5 giy
1 2 3
( ) ( ) ( )...
I I If f f
1 2 3
( ) ( ) ( )
...
II II II
f f f= =
c im:Khi tnh ton lng mt cn bng cng sut ln nht khng tnh d phng
107
Nguyn l thc hin sa thi ph ti theo tn s
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Khi tnh ton lng mt cn bng cng sut ln nht khng tnh d phngquay ca h thng (tng thm mc an ton trong tnh ton lng cngsut cn ct).
H s 1.05: tnh n cc bin ng ngu nhin khi s c (5%) Lng cng sut cn sa thi ca mi nhm: thng c chia u cho cc
t sa thi. Ti uan tr n hn s sa thi sau cn v n l i u tin.
cc li in hoc h thng in khu vc c kh nng xy ra thiu ht
cng sut ln v suy gim tn s trm trng (
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y g ,
Ct ng dy hay my bin p ln
Thay i chiu lung cng sut qua ng dy, my bin p
Da theo tc bin thin tn sDa theo s sp gim in p
Gii php sa thi b sung khc: tch mt vi t my lm nhim v cp in
cho h thng t dng ca ton nh my v tch nh my ch cp cho mt slng ph ti vi cng sut thit k.
109
Nguyn l thc hin sa thi ph ti theo tn s
S H
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50.0
t 2Nhm I
48.548.448.348.2
2
S cHz
t (giy)
t 1Nhm I
Nhm II khing t 1Nhm II t 2Nhm II
Rle cc nhm sa thi tr v
1
Din bin tn skhi c sa thi phti
Rle tc ng theo lch tuyt i tn s :
Rle tc ng bt c khi no tn s thp hn gi tr chnh nh
110
Cc phng tin sa thi ph ti
f
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Ci t chnh nh d dng
Khng tnh n tc suy gim ca tn s
Rle tc ng theo tc bin thin tn s hoc tc bin thintrung bnh :
dfdtf
Tc bin thin tn s phn nh mc mt cn bng cng sut
Rle c kh nng phn ng nhanh hn vi s c
Thc t: s dng kt hp c hai chc nng ( & )fdf
dt
(Tc ng theo tc bin thin trung bnh gim khnng tc ng nhm khi c dao ng tn s ngn hn)
Suy gim tn s ngn hn
Khi thanh gp b ct in, tc cc ng c gim dn v cc ng c ny c
111
Cc trng hp gy tc ng nhm rle tn s
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g p , g g g ykh nng duy tr in p trn thanh gp mt thi gian na (tn s in pny gim theo tc ng c): rle c th tc ng nhm kha thit b t
ng li Ph ti s khng c cp in khi thanh gp c in tr li. Gii php: cc ph ti ny s c ni ti rle tn s nhm II, c thi gian lm vic tr
S d n cc rle cn sut ho c dn i n c c tiu ht hi n s c mt i nkha tm thi thit b sa thi ph ti
Vi cc h thng in nh: s c ba pha c th gy tn tht cng sut tcdng rt ln v lm cho tn s c th b suy gim
S dng cc thit b bo v rle c thi gian tc ng nhanh, loi tr s c trc khitn s b sp gim n ngng khi ng ca rle sa thi.
Do cc b iu tc c thi gian phn ng chm: S dng cc rle tn s nhm II
S dng rle dng in cc tiu ngn nga s tc ng nhm ca rle tn skhi ph ti l cc ng c ln:
112
Cc trng hp gy tc ng nhm rle tn s
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S dng kt hp rle in p thp & rle dng cc tiu
113
Cc phng tin sa thi ph ti
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Rle tn s c th tc ng nhm do nhiu l do Do h thng tng li c coi l bt buc i vi vic sa thi ph ti
114
T ng tr li cc ph ti sau sa thi
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Thit b t ng li nn ni ti:
Cc rle tn s thuc nhm sa thi sau cng (l cc ti quan trng hn)
Ni ti cc nhm sa thi u tin (nhm I): y l nhm sa thi d b tc ngnhm.
.
Thi gian tr: 10
20 giy trnh vic ng li nhiu ln trong trng hp h thng khng th
hi phc: ch tc ng mt ln
Cc ph ti nn c ng li dn theo nhm nh (nh hn bc sathi): trnh hin tng khi ng ng thi v nu c st gim tn snh th cc b iu tc mi kh nng iu chnh.
115
V d
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Din bin tn s khi c sa thi v t ng li (h thng 60Hz).
h
116
Chng 1: T ng ng li cc ngun in
Chng 2: T ng chuyn i ngun in
Chng 3: T ng ha ng b cc ngun in
Chng 4: T ng sa thi ph ti theo tn s
5: T ng i chnh in p & cng phn khng ong HT
Chng 6: T ng iu chnh tn s & cng sut tc dng trong HT
-
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iu chnh in p & Cng sut
Chng 05
phn khng
in p l mt ch tiu nh gi cht lng in nng Thng thng in p ti u cc ph ti khng nn vt qu
117
Gii thiu chung
5%
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gi tr nh mc.
in p gim thp:
Gim nng sut cc dy chuyn, gim mc chiu sng
Tng h s trt trong cc ng c, tng s tiu th cng sut phn khng
in p gim thp ti cc nt trong h thng in: gim kh nng ti ca
ng dy, nh hng ti tnh n nh ca cc my pht. in p trong h thng in thng c iu chnh duy tr ti mt
s im nt (v d: thanh gp 220kV Ha Bnh)
Vic iu chnh in p & cng sut phn khng mang tnh cc b aphng (khc vi vic iu tn).
gim thiu vic truyn ti CSPK trn li in: c gng duy tr cnbng CSPK cho tng cp truyn ti
118
Cc phng tin iu chnh U & Q trong HT
-
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119
Cc phng tin iu chnh U & Q trong HT
Cc b t b
-
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in trx
120
Cc phng tin iu chnh U & Q trong HT
Cc b t b
-
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Khn n i ti
Tb
o Hn chdng in khi ng bto Hn chsng hi chy vo bt
(Detuned Reactor)o Hn chcng hng
121
Cc phng tin iu chnh U & Q trong HT
Cc khng b ngang
-
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122
Cc phng tin iu chnh U & Q trong HT
Cc khng b ngang
-
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123
Cc phng tin iu chnh U & Q trong HT
Phn bit vi khng ca b PLC (ti ba Power line communicationor power line carrier )
-
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Khng b ngang
Khng tiba (1 hoc
2 pha)
124
Cc phng tin iu chnh U & Q trong HT
Cc b t b dc
-
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Trm 500kV Ha Bnh
125
Cc phng tin iu chnh U & Q trong HT
Phn pha ng dy
-
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Phn pha ng dy
Cc yu t nh hng n in p trong h thng in:in p u cc cc my phtT t d t ti
126
Cc phng tin iu chnh U & Q trong HT
-
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Tng tr ca cc ng dy truyn ti
Lng cng sut truyn ti qua li
T s my bin p
127
Cc mch vng iu khin c bn ca MF
Thi gian p ng camch kch t ngn hn rt
-
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nhiu so vi mch iukhin tua bin, do hai
phn iu khin c th coil hai mch vng c lp.
LFC Controller: Thit b iu tnFrequency Sensor: cm bin o tn sAVR: b t ng iu chnh in p my pht
Excitation system: Phn kch t ca my pht
Turbine: Tua bin; Shaft: trc niSteam: hi vo tua binValve control mechanism: C cu iu chnh m
van nng lng vo tua bin
128
iu chnh kch t v in p my pht in
S chi tit ca mch vng iu khin kch t
Stepup transformer: bin p tng p u cc MFStepdown Transformer: bin p gim p cp cho h
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thng t dng v kch tExciter: cun kch t
Auxilliary services: H thng t dngAVR: b iu khin kch t (iu chnh in p)
H thng kch t c th chia ra 3 loi:
H thng kch t mt chiu (DC)
H thng kch t xoay chiu (AC) Khng vnh trt
129
Cc loi h thng kch t
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H thng kch t xoay chiu (AC) Khng vnh trt.
H thng kch t dng chnh lu trc tip
1. H thng kch t mt chiu (DC):
130
Cc loi h thng kch t
-
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H thng kch t mt chiu: hin ti vn cn tn ti, thng dng cho cc my phtc cng sut
-
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Cng sut ca ngun cp cho kch t my pht ph v thit b chnh lu c iu khinrt nh (h thng hai my pht mt chiu c th cung cp kh nng khuych i cngsut ti t s 600/1)
Nhc im:
Thi gian p ng chm
Do vn dng chi thanvnh gp nn thng xuyn phi thay th.
Vn s dng h thng vnh trt a cng sut kch t vo my pht chnh.
H thng ny ang dn dn b thay th bi cc h thng kch t th h sau
Vnh gp
132
Cc loi h thng kch t
Vnh trt (slip ring)
-
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2. H thng kch t xoay chiu (AC) Khng vnh trt:
133
Cc loi h thng kch t
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Cc diot chnh lu c gn ln roto ca my pht kch t xoay chiu
Cun kch t cho my pht kch t xoay chiu nm trn stato (khng quay)
in p sau chnh lu ni trc tip ti cun kch t my pht chnh (nm cng trc). Cng sut ca ngun iu khin kch t khong 1/20 (30) cng sut cun kch t my
pht chnh (do ch c mt tng khuych i)
2. H thng kch t xoay chiu (AC) Khng vnh trt:
134
Cc loi h thng kch t
-
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Khng cn h thng vnh trt, vnh gp
Thi gian p ng ca qu trnh iu chnh nhanh hn
Cng sut ca h thng ngun kch t nh (1/20 (30)) H thng vn c s dng trong cng nghip v khng yu cu mt ngun kch t
ring bit qu ln
3. H thng kch t dng chnh lu trc tip:
135
Cc loi h thng kch t
-
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Ngun cp cho h thng kch t c th ly t u cc my pht hoc t h thng tdng
Cn c bin kch t bin i in p cho ph hp
Mt gii php khc: ly cng sut cp cho kch t t h thng bin dng in v binin p Vi gii php ny: in p cp cho kch t t b nh hng bi ngn mchgn hoc st gim in p u cc.
3. H thng kch t dng chnh lu trc tip:
136
Cc loi h thng kch t
-
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gim tn tht trong b h thng kch t: dng hai b chnh lu c iu khin
Mt b dng trong ch bnh thng (ch xc lp)
Mt b dng trong ch cn cung cp kch t cng bc (cng hnh kch thch) Thi gian p ng iu khin nhanh.
Trong ch dit t: b chnh lu c th iu khin tr thnh b nghch lu tiu thnng lng th trong cun roto.
S khi ca thit b t ng iu chnh in p my pht
137
Thit b t ng iu chnh in p MF (AVR)
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Load compensation: B phn b ti
Limiter: B gii hn dng kch tComparator: B so snhAmplifier: B khuych iFeedback: Tn hiu phn hiPSS: b n nh cng sut
Measuring element (transducer): Phn t o lng
Generator: my pht chnhStepup transformer: Bin p tng p u ccNetwork: pha h thng
S khi chi tit khc138
Thit b t ng iu chnh in p MF (AVR)
-
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Follow up Unit: m bo s chuyn i mm gia ch t ng/chnh tay
Vi cc h thng kch t kp (hai nhnh kch t ring): mt nhnh c iu chnhch ng, nhnh cn li iu chnh ph thuc theo (follow up)
H thng kch t kp (dual channel)139
Thit b t ng iu chnh in p MF (AVR)
-
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140
Thit b t ng iu chnh in p MF (AVR)
-
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p n : c s ng c n u n g ng np ti nt ph ti pha xa.
in p ri trn tng tr t my pht n ti:
Vi: Vc: in p cn b
Vg: in p u cc my pht
Rc & Xc: tng tr t my pht n ti
Khi khng cn b ti: t Rc=0; Xc=0 khi s gi in p ti u
cc my pht
141
Thit b t ng iu chnh in p MF (AVR)
-
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g n ng c : g n ng c c c v c c uCun kch t b gii hn v mt pht nng do phi gii hn dng kch t
cc i
Vi cc h thng hin i: s dng h thng gii hn dng kch t cc inhiu bc: dng kch t ln nht cho php ty thuc vo khong thi gian tnti.
H thng gii hn dng kch t l cn thit ngn nga qu ti khi my phtlm vic vi h thng: trnh trng hp thiu cng sut phn khng ln vmy pht s c iu chnh b li s thiu ht ny.
B gii hn dng kch : gii hn dng kch t cc i v cc tiuGii hn dng kch t cc tiu: cn thit phi gi mt ngng ti thiu ca
dng kch t trnh trng hp my pht d b mt ng b
B n nh cng (PSS) t d i khi tt h h
142
Thit b t ng iu chnh in p MF (AVR)
-
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B n nh cng (PSS): c tc dng iu khin tt nhanh cc
dao ng in trong h thngTn hiu u vo ca b PSS c th l tc roto, tn s dng in pht ra v
.
B PSS a thm tn hiu iu khin vo mch iu chnh in p.
S khi ca cc thit b AVR khc
143
Thit b t ng iu chnh in p MF (AVR)
-
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iu chnh dng bin tr
S khi ca cc thit b AVR khc
144
Thit b t ng iu chnh in p MF (AVR)
-
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S khi ca cc thit b AVR khc
145
Thit b t ng iu chnh in p MF (AVR)
-
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iu kin vn hnh song song cc my pht in: xt hai my pht
in G1 & G2 cng ni chung vo mt thanh gp. Mi my pht ctrang b mt b t ng iu chnh kch t (AVR)
146
Vn hnh song song cc my pht in
-
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AVR AVR
c tnh iu chnh ca my pht UF=f(IQ) c th l c tnh c lphoc ph thuc
Ukhngti
a. c lpb. Ph thuc
IQ IQ
Ukhngti
Ukhngti
Gi thit hai my u trang b c tnh iu chnh c lp
Khi in p trn thanh gp chung b gim: my pht c b iu chnh vi vng chtnh s tc ng trc nhn thm cng sut Q.
My pht cn li c th khng tc ng nhn thm Q hoc ch tc ng nhn thm Qkh h h h h kh h b
147
Vn hnh song song cc my pht in
-
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khi my th nht ht cng sut cng sut phn khng phn b gia cc my ty
: c my b y ti, c my non ti.
AVR AVR
IQ
Nu hai my c trang b c tnh ph thuc
Cng sut phn khng s phn b tun theo dc ca c tnh iu chnh
My pht c cng sut ln hn nn c trang b c tnh c dc t hn v ngcli
148
Vn hnh song song cc my pht in
-
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dc ca c tnh iu chnh c nh ngha: tans =
thay i dc ca c tnh iu chnh, m bo s phn b n nhcng sut Q gia cc my pht lm vic song song: dng mch n nh dngin
AVR AVR
IQIQ2 IQ1
Uthanh gp
Mch n nh dng in
149
Vn hnh song song cc my pht in
in p a vo mch so snh c tnghp thm tn hiu dng in (IQ)
in p a vo mch so snh (b qua ts bin BU & BI):
-
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AVR khong tai QU U I R= +
)
Khi my pht nhn thm cng sut phn
AVR AVR
ng Qt ng n t n p n Qxtng in p UAVRtng ln.
Khi b iu khin thy in p u vob so snh UAVRca n tng ln s iuchnh gim in p u cc.
Quan h iu chnh: IQtng & UFgim
l c tnh iu chnh ph thuc
Mc ph thuc (phn chia ti) c ththay i bng thay i gi tr in tr R
Chi i mch n nh dng in
150
Vn hnh song song cc my pht in
Tha i dc c nh i chnh:
Thay i gi tr in tr R
Dch chn dc c nh i chnh:
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Dch chn dc c nh i chnh:
S dng my bin p c iu chnh t sphn p
Khi thay i t s bin p in p tvo b AVR thay i
Gim t s: in p o c gim i bAVR tng kch t gi in p u ccc tnh tnh tin ln
Tng t s: c tnh tnh tin xung
AVR
Chi i mch n nh dng in
151
Vn hnh song song cc my pht in
-
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AVR
in p tham chiu c ly t hai pha bt k Dng in a mch n nh dng in: ly t pha cn li
Mch n nh dng in Cc ch ho ng
152
Vn hnh song song cc my pht in
MF n hnh i h cng bng 1
-
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Cc my pht ch pht P, khng pht Q khng cn chia s Q
in p b thm bi mch n nh: rt nh khng gy thay ilng cng sut Q ca cc my
Mch n nh dng in Cc ch ho ng
153
Vn hnh song song cc my pht in
MF n hnh i h cng bng 0.8
-
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in p b thm bi mch n nh: gy thay i in p ln hntrng hp cos phi = 1
Mch n nh dng in Cc ch ho ng
154
Vn hnh song song cc my pht in
MF n hnh i h cng bng 0
-
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My pht ch pht cng sut phn khng Q
in p t mch n nh: cng trc tip vo in p o c ca AVR
S dng chng Mch n nh dng in & B phn b ph i
155
Vn hnh song song cc my pht in
-
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AVR AVR
AVR khong tai QU U I R= +
Mch n nh dng in v B phn b ph ti: c s u ni cc tnh dng in khc nhau (mch n nh
dng ly thnh phn dng in phn khng) Trong a phn cc trng hp: khi ch cn b in p
cho ph ti theo thnh phn IQ*X Hai s c thdng chung
Vic iu chnh in p c th thc hin thng qua vic thay i
u phn p cc my bin p Vic thay i u phn p c th thc hin khi MBA ang mang
ti hoc ct in ty theo cu trc b chuyn mch
156
Thit b t ng chuyn i u phn p MBA
-
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ti hoc ct in ty theo cu trc b chuyn mchChuyn u phn p phi ct ti: thng p dng cho cc my bin p
trung p hoc h p. Phm vi iu chnh thng trong khong 5%
Chuyn u phn p khi ang mang ti: thit b iu p di ti (OLTC) .Phm vi iu chnh thng trong khong 20%
Nguyn l lm vic ca thit b iu p di ti
157
Thit b t ng chuyn i u phn p MBA
-
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Vi in khng (a) Vi in tr (b) Loi t hp
Tip im D&S ring bit
M phng nguyn l lm vic ca thit b iu p di ti
158
Thit b t ng chuyn i u phn p MBA
-
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S cn thit phi c thit b i ni trung gian
159
Thit b t ng chuyn i u phn p MBA
-
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Khng c thit b i ni
S cn thit phi c khu hn ch dng in
160
Thit b t ng chuyn i u phn p MBA
-
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Khng c thit b hn ch dng in
Hn ch dng in bng in tr
161
Thit b t ng chuyn i u phn p MBA
-
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Hn ch dng in bng in tr
162
Thit b t ng chuyn i u phn p MBA
-
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Chuyn u phn p qua tip im trung gian ph
163
Thit b t ng chuyn i u phn p MBA
-
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Hn ch dng in bng in khngKhng tn hao
C th nm trong mch chuyn mch Khng cn loi tr sau khichuyn mch
164
Thit b t ng chuyn i u phn p MBA
-
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Chuyn mch bng my ct chn khng
Cc phng php chuyn mch: xut hin h quang du nhanh bkm cht lng
S dng thm chuyn mch bng my ct chn khng
165
Thit b t ng chuyn i u phn p MBA
-
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Chuyn mch bng my ct chn khng
166
Thit b t ng chuyn i u phn p MBA
-
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Chuyn mch bng my ct chn khng
167
Thit b t ng chuyn i u phn p MBA
-
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Phng php trch u phn p vi MBA t ngu
168
Thit b t ng chuyn i u phn p MBA
a. S vng ca cun cao p(H) l c nh t svng/volt s c nh nuin p cao p c nh
-
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Thch hp nu in p caop t thay i
b. Thch hp nu in p caop thay i nhiu
Cng tc o chiu:
o Ch vn hnh khi u phnp ti v tr N (neutral)
o o chiu cc tnh in p iu chnh tng/gim
Trch u phn p gn im trung tnh cun dy
169
Thit b t ng chuyn i u phn p MBA
Cc phng php trc ly u phn p ln cn v tr X
Phng php ly u phn p gn im trung tnh: gimc cch in ca thit b OLTC
-
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Tuy nhin: S vn cun cao tha i theo v tr u hn
Khng thch hp s dng v in p pha cao p thng tngi n nh
S khi ca qu trnh iu khin thay i u phn p
170
Thit b t ng chuyn i u phn p MBA
B i
Ncphn p
Bin ng (nhi)
Tn hi i khin khc(vd: t b iu khin ch o)
-
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khin B chnmch M bin p
Bin ng (nhiu): v d s thay i ca ti, thay i cu trc li dnn thay i in p
Tn hiu iu khin khc: khi my bin p lm vic song song th cc biu khin c th nhn tn hiu iu khin t mt b iu khin ch o(master)
S u ni ca b iu khin
171
Thit b t ng chuyn i u phn p MBA
-
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Cc gi chnh nh
Mc in p ci tGi tr ci t thng cao hn 5% b cho in p ri trn ng dy
Vng khng nhy
172
Thit b t ng chuyn i u phn p MBA
Vngkhng
nhy105V
kU
-
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Phi m bo sao cho khi iu chnhknU
in p khng c vt qungng khng nhy
Thi gian trU
1 1 1 2( . . )kn
U U =
Thi gian tr:
trnh thit b lm vic lin tc khi c dao ng in p ngn hn (vd: do ng
c khi ng)t 3060 giy Gi in p ti im nt ph ti:
Tng t nh trong thit b iu khin kch t
L do lm vic song song ca cc MBA:Tng kh nng ti
Tng cng mc d phng
D dng khi cn bo dng mt MBA
173
Phi hp s lm vic song song cc MBA
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Cc vn cn quan tm
Khc tng tr
B iu khin khng tng thch vi nhauTng dng ngn mch...
Hu qu khi phi hp sai:
Ti phn b khng uDng cn bng chy qun ln
Qu ti, tng tn tht
B OLTC hot ng nhiu: hao mn, tng gim p lin tc...
L do cn phi hp cc b iu p di tiSai lch thi gian: mt b iu p hot ng nhanh hn cc b khc
Mt MBA s thay i u phn p trc, MBA cn li khng thay i haiMBA s vn hnh song song vi cc nc phn p khc nhau sinh ra dng cnbng chy qun gia hai my pht nng, qu ti, tng tn hao.
174
Phi hp s lm vic song song cc MBA
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MBA 15MVA; Xk%=8.7;
Uth cp=12.7kV
Lch mt nc phn pIcb=25A
Yu cu i vi vic phi hpCc MBA song song: m bo iu p nh ci t vi mt my
Nc phn p: c t ng la chn sao cho dng cn bng chy qunnh nht
C MBA h kh hi h i h
175
Phi hp s lm vic song song cc MBA
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Cc MBA c th khng cn thit hot ng ti cng v tr u phn pCc chc nng phi t ng c m bo: khi thay i cu hnh h thng
Cc phng php phi hp b iu khinTheo phng php b iu khin ch o/ ph thuc
(Master/Flolower)
Phng php dng cn bng nh nht
176
Phi hp s lm vic song song cc MBA
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Nguyn l iu khin ch o/ph thuc
Da theo gi thit: gi cng nc phn p dng cn bng nh nht
177
Phi hp s lm vic song song cc MBA
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Ch o/ph thuc gi cng nc phn pCh p dng vi cc MBA ging nhau hon tonT s BI c th khc nhau
Yu cu c phn hi t thit b c iu khin (thng dng cc rle
t i )
178
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trung gian)
Khi c 01 b iu khin Khi c 02 b iu khin
Nguyn l dng cn bng nh nhtS dng thm thit b ph tr (Parallel Balancing Module)Thit b ph tr phn tch dng in chy qua MBA:
Dng ti thng thng cc dng ti qua cc MBA cng pha vi nhau
Dng cn bng chy qun lch pha 1800
gia cc MBA
179
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Dng cn bng chy qun lch pha 180 gia cc MBA
S u ni theo phng php dng cn bng nh nht
Nguyn l ca khi cn bng dng
V dMy bin p cng sut 12 MVA 13,8kV; Un=9%Phm vi iu chnh ca mt nc phn p: 0,625%
180
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Mi my mang ti 10MVA
V d phng php nguyn l dng cn bng nh nht181
Phi hp s lm vic song song cc MBA
Cun th cp ni tipdng in cun s cpK1&K2 phi bng nhau
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Cc tnh dng in a
vo rle 90 (iu chnhu phn p) khc nhau cc MBA chu tc ngiu chnh ngc nhau
Cun khng: iu chnh nhy bng cch iu chnht l dng vo rle 90
i h h t & C t
Chng 06
182
Chng 1: T ng ng li cc ngun in
Chng 2: T ng chuyn i ngun inChng 3: T ng ha ng b cc ngun in
Chng 4: T ng sa thi ph ti theo tn s
Chng 5: T ng iu chnh in p & cng sut phn khng trong HT
6: T ng i chnh n & cng c dng ong HT
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iu chnh tn s & Cng suttc dng
Tn s ca h thng in bt buc phi c duy tr:
Vn hnh vi tn s dao ng trong khong c th cho phptrong khong thi gian ngn (vi iu kin lch gia ng h in& ng h thin vn khng qu 2 pht trong 24 gi).
Vic iu chnh tn s mang tnh h thng phng tin iu chnh l h i
183
Gii thiu chung
50 0 1. Hz
0 2. Hz
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Vic iu chnh tn s mang tnh h thng, phng tin iu chnhtn s l cc my pht in
Ti cc t my c trang b cc b iu tc
B iu tn s tc ng thay i tham s t ca cc b iu tc nytrong qu trnh iu khin tn s.
Qu trnh iu chnh tn s:
iu chnh s cp: do cc b iu tc m nhn. B iu tc c thit k iu khin duy tr tc tua bin thng qua iu chnh
ngun nng lng s cp (nc, hi...) vo tuabin.
Qu trnh iu tc s cp c nhim v nhanh chng ngn chn s mt cn bng cng
sut.C i t h i t t t i t l h t ht h
184
Gii thiu chung
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Cui qu trnh iu tc s cp vn tn ti mt lch tn s nht nh.
m t ay trao u c ng su t tr n c c ng truy n t
iu chnh th cp:
a tn s tr v nh mc iu chnh li lung cng sut trao i gia cc khu vc theo mt k hoch xc nh
trc.
Phn b li lng cng sut iu chnh gia cc t my nhm cc tiu ha chi phi vnhnh.
Thi gian ca cc qu trnh iu chnh
185
Gii thiu chung
iu chnh in p
iu khin tuabin
iu tn & dngcng sut
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iu chnh in p
Bo v rle
H thng iu tc ca cc tuabin hi
186
S khi
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Hot ng Speed Governor: l b o tc , tn hiu u ra l v tr ca thanh iu khin t l
vi tc thc ca tuabin
V tr ca thanh ny c so snh (bng c kh) vi v tr chunmc sai lch v tr t l vi lch tc
Tuy nhin lch ny nh: cn khuych i v c lc v khong lch dng cc bkhuych i Speed Relay v Servo Motor
My iu tc tuabin c nhiu loi: do cn thao tc iu khin vi lc ln nn
cc c cu tha hnh phn ln c tr gip bng thy lc. Cc b iu tckhc nhau c cu o tc
Loi c kh: n gin nht dng c cu tay quay & qu vng o tc
Loi thy lc: s dng mt bm du ly tm quay bi tuabin. Bm ny s bm
du vo mt xi lanh c piston. Piston c cn bng bi lc l xo. p lc du t lvi bnh phng tc quay v tr ca piston t l vi tc
187
My iu tc tuabin
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vi bnh phng tc quay v tr ca piston t l vi tc .
Loi dng tn hiu in: tuabin quay mt my pht in dng nam chm vnh cu.Tn hiu in pht ra b lc vi tn s cng hng bng tn s nh mc. u
ra ca b lc c chnh lu cho ra in p mt chiu t l vi lch tc .Gii php khc: s dng my pht xung vung quay bi tuabin. Tn hiu xungvung ny c so snh vi tn hiu t mt b dao ng thch anh chun . Tnhiu u ra ca b so snh cng c chnh lutn hiu iu khin.
C cu o tc kiu c kh: tay quayqu vng
188
My iu tc tuabin
Tay quay
Qu vngL xo
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Trcquay
C cu o tc kiu c kh: cc bin th
189
My iu tc tuabin
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C cu o tc kiu thy lc
190
My iu tc tuabin
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C cu o tc s dng tn hiu in & quang in
191
My iu tc tuabin
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Loi c kh (a qa q ng)
192S khi my iu tc tuabin
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Centrifugal Governor: b o tc kiu ly tm (tay quayqu vng)
193S khi my iu tc tuabin
Loi in h lc
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CCD: c cu t
194My iu tc tuabin
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Du p lc vo
Du x
Khi thiu cng sut Tc tuabin gim i
195My iu tc tuabin
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Du p lc vo
Du x
196My iu tc tuabin
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Du p lc vo
Du x
197My iu tc tuabin
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Du p lc vo
Du x
Vai tr ca c cu t (CCD)
198My iu tc tuabin
thay im t qua thay i cng sut pht ca t my
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Du p lc vo
Du x
Vai tr ca c cu t (CCD)
199My iu tc tuabin
Khi a v tr t ln cao hn
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Du p lc vo
Du x
Vai tr ca c cu t (CCD)
200My iu tc tuabin
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Du p lc vo
Du x
Vai tr ca c cu t (CCD)
201My iu tc tuabin
tng cng sut pht ca t my
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Du p lc vo
Du x
Hon ton tng t vi phn iu khin kch t cc my pht in: cc
my pht c th lm vic song song n nh
c tnh iu chnh ca mypht phi l loi ph thuc
202Phi hp s lm vic song song cc MF
f
fm
f
f1f
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Cc t my c dc t hn s nhn nhiu cng sut ln hn v ngc li.
c dc c tnh iu chnh ty theo cng sut my pht. Thng dc c t trong khong 28%
P PP1 P2P1 P2
1P
2P
c tnh c lpc tnh ph thuc
203S h thng iu tn trong HT
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Chng 7
204
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T ng ha trm bip p &
T ng ha li in phn phi(SCADA, Substation Automation & Automation for
Power Distribution )
Tham kho cc slide gi km
205Gii thiu chung
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Thit b FACTS trong h thng in(FACTS devices Introduction & Applications)
Chng 8
206
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SVC (Brail) 500 kV, +/250 MVAr
H thng truyn ti in xoay chiu linh hot
Hoc Flexible Alternating Current Transmission System hayFACTS
nh ngha ca IEEE l: h thng s dng cc thit b in t
cng sut v cc thit b tnh khc iu khin mt hoc nhiu
207nh ngha
, ,
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nng cao kh nng iu khin v kh nng truyn ti cng sut.
Mc ch s dng thit b FACTS:Truyn ti dng in xoay chiu
Nng cao kh nng iu khin h thng inTng kh nng truyn ti cng sut
Gii quyt cc vn cht lng in nng
Phn t c bn ca thit b FACTS:
Cc b nghch lu c iu khin cng sut ln (Power ElectronicSwitching Inverter)
B iu khin (Controller)
B ngun (c th c hoc khng)
208Gii thiu chung
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209Tin b ca cng ngh in t cng sut
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Aembl of Chip in
IGBT
Pelle of GTO / IGCTPelle of LTT Thio
LTT = Ligh iggeed Thio
GTO= Gae noff Thio
IGCT = Inlaed Gae commaed Thio
IGBT = Inlaed Gae Bipola Tanio
S dng LTT Thyristor
210Modun cho h thng HVDC
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Thay th cc chnh lu thy ngn
211Trm chnh lu 3,100 MW Celilo (M) HVDC
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212H thng thyristor ca hng NARI
Khi iu khin thyristor
Thyristor
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B tn nhit
Phn loi s b thit b FACTS:
213Phn loi
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Kt ni song songKt ni ni tip Kt ni hn hp
Static VAR Compensator (SVC)
Thyristor Controlled Series Capacitor (TCSC) Thyristor Controlled Phase shifting Transformer
Static Synchronous Compensator (SSC)
Static synchronous Series Compensator (SSSC)
214Cc thit b FACTS ph bin
Unified Power Quality Conditioner (UPQC)
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Unified Power Quality Conditioner (UPQC)
Unified Power Flow Controller (UPFC)
Interline Power Flow controller (IPFC)
Static Var Compensator (SVC)(FACTS devices Introduction & Applications)
215
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SVC (Brail) 500 kV, +/250 MVAr
Chc nng ca thit b b tnh SVC
Giai on mi xut hin: B v duy tr h s cng sut cho cc ti cc nh my luyn thp, l h
quang
Cn bng ti
SVC c s dng cho li truyn ti (cui thp k 70)
216Static VAR Compensator (SVC)
T ng n ng truy n t c o ng y
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Ci thin tnh n nh nh kh nng iu chnh nhanh in p
Dp tt cc dao ng tn s thp (dao ng in) Khng ch qu in p
Hot ng:
iu chnh in p: thay i lng CSPK pht/tiu th vo h thng
iu chnh lin tctrong phm vi Q + Q
Khng gm cc phn quay qun tnh iu chnh rt nh
Cu to
Thyristor Controlled Reactor (TCR) Khng c iu khinThyristor Switched Capacitor (TSC) T ng/ct bng thyristor
217Static VAR Compensator (SVC)
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B t ng/ct: iu chnh th, nhy cp
Khng c iu khin: iu chnh trn
u ni vi h thng
Cc b SVC thng c ni ln ng dy qua my bin p (couplingtransformer)
Cc my bin p gim in p xung cp thch hp ( v d t220kV23kV)
Gim chi ph v cch in cho SVC
218Static VAR Compensator (SVC)
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V d
219Static VAR Compensator (SVC)
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S khi ca phn iu khin
220Thut ton iu khin n gin
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Khi o lng
o in p lc ra thnhphn in p th t thun
Khi iu chnh in p:
221Thut ton iu khin n gin
tnh ton tng dn B cn c Khi ng b & pht xung
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tnh ton tng dn B cn cca SVC b sai khc ny
Khi la chn:
Xc nh xem bao nhiu khiTSC s cn ng vo
Xc nh gc m ca thyristortrong mch TCR
Khi ng b & pht xungiu khin thyristor:ng b in p s dng
mch PLL (PhaseLockedLoop)
To xung iu khinng/m
Mch PLL (PhaseLocked
Loop)C nhim v pht ra tn hiu
c ng b v gc pha vitn hiu u vo (reference
signal)
222Thut ton iu khin n gin
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Va
Vb
Vc
Va
Vb
Vc
Phase-Locked
Loop
thetatheta
Main : Graphs
0.060 0.080 0.100 0.120 0.140 0.160 0.180 0.200
-200
-100
0
100
200
300
400
y
Va Theta
Kt qu m phng mch PLL
SVC c hai ch vn hnh
Ch iu chnh in p (voltage regulation)Ch iu chnh cng sut (VAR control): gi tng dn khng i
223c tnh lm vic VI ca SVC (ch xc lp)
Gii hn theo dunglng khng in
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c tnh lm vic ch iu chnh in p
Gii hn theo dung lng t
Biu din quan h gia in p trn SVC v dng in (cng sut phn khng ca SVC)
lng khng in
dc ca c tnh
m bo s hot ng song song gia cc bSVC & vi cc thit b b khc
Ngn nga vic SVC lm vic ht cng sutthng xuyn
Xc nh im lm vic ca SVC
224c tnh lm vic VI ca SVC (ch xc lp)
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225Thut ton iu khin nng cao
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Vi thut ton iu khin n gin
SVC phn ng vi tn hiu lch in p iu chnh lng CSPKpht ra
Vi s c ln, SVC s dng hu ht kh nng pht CSPK
Khi s c tip theo: SVC khng cn kh nng phn ngCn c thut ton iu khin: a gi tr pht ca SVC v gi tr mc
nh (rt nh) ch ln lm vic k tip
Thut ton iu khin nng cao
Cn c thut ton iu khin: a gi tr pht ca SVC v gi tr mc nh (rt nh) ch ln lm vic k
tip
Thi gian tc ng ca khu iu khin ny: Rt chm (hng chc giy hoc hng pht)
226Thut ton iu khin nng cao
ng n ng t t n n ng u c n n an n p c a
Khi SVC pht tr v gi tr mc nh ban u
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Khi SVC pht tr v gi tr mc nh ban u
Cc thit b pht CSPK khc ln cn s m nhn phn SCPK thiu ht (cc bt b)
Khu iu chnh in ptng t nh thut toniu khin n gin
Khu iu chnh cng sutVAR (gi tng dn khng
i):
227 Thut ton iu khin nng cao
t vi gi tr t (Bset)
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Gi tr Bsetthng tng
ng vi lng CSPK do blc sng hi trong SVC pht ra
Sai s c a qua khu tchphn tn hiu in p hiu
chnh ti b so snh Khu iu chnh ny hot
ng vi hng s thi gian ln(hng chc giy hoc vi pht)
Khu iu chnh cng sutVAR (gi tng dn khngi): Chc nng ny c th tm b
khakhi c bin ng in pln tn dng ton b cngsut ca SVC
228 Thut ton iu khin nng cao
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iu khin cc thit b bngoi vi
Khi SVC c iu khin trv gi tr tng dn mc nh cc thit b b khc phignh phn CSPK
Trang b thm khu iu khin
229 Thut ton iu khin nng cao
n ng t t t ngovi
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1. im hot ng bnh thng: giao ctgia c tnh ti ca h thng v c
tnh ca SVC2. Xy ra bin ng in p gim mt
lng VT SVC nhanh chng dichuyn im lm vic ti 2 di tc
dng ca khu iu chnh in p
230 Phn tch hot ng
. thi gian ln tn hiu ca khutch phn ln s tc ng iu
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tch phn ln s tc ng iu
chnh a im lm vic v 34. Do :
1. in p b gim di ngng mong mun
2. SVC vn cn kh nng d tr hot ng
5. Cc thit b b ln cn c th c avo ph tr thm.
231Logic kha khi thp p
L do kha SVC khi xy ra thp p trm trng
Khi xy ra s c in p st trm trng SVC vn hnh ch thun dungkhng khi s c c loi tr c th gy qu p
Cn kha SVC khi in p st qua thp
Logic thc hin
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Khi in p 3 pha gim qu UVmin(thng t 60%): Chc nng iu chnh in p b kha (bng cch gn Bref=0)
Kha van thyristor thao tc ng/ct cc b t (TSC)
Chc nng iu chnh VAR cng b kha
Khi in p hi phc trn ngng UVmax(thng t 69%) lu (30ms): B tn hiu kha {chc nng iu chnh in p & ng/ct b t}
Sau (170ms): m kha chc nng iu chnh chm VAR
232 M hnh ha SVC Mc phc tp ca m hnh SVC ty theo mc ch nghin cu
Cc mc ch nghin cu: Tnh ton tro lu cng sut (Power Flow)
M hnh tnh ton khi c cc bin ng ln & nh
Nghin cu hin tng qu in t (EMTP)
Nghin cu vn sng hi v cht lng in nng
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233 M hnh ha SVC M hnh s dng khi tnh ch li (ch xc lp)
Trong phm vi iu chnh B qua dc c tnh iu khin
SVC c m phng nh mt nt PV vi P=0 & V=Vref
Nu dc c tnh cn tnh ti:S dng m hnh nh trn
Chn thm mt thanh gp gi tng vo s
T an g p gi t ng n i t i t an g p SVC ng m t i n ng tng ng v i c ctnh iu khin
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M hnh m phng c xt dc c tnh iu chnh
234 M hnh ha SVC M hnh s dng khi tnh ch li (ch xc lp)
Ngoi phm vi iu chnh Nu ISVC> Imax(v pha in khng)
Nu V < Vmin (v pha in dung)
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235 M hnh ha SVC M hnh s dng khi xt n cc kch ng ln & nh
Nu xem xt vn n nh do cc dao ng in c B qua m phng cc qu trnh qu in t trong m hnh ca SVC
Thay th SVC bng mt tng dn thay i Dng in qua SVC theo quan h vi tng dn
Ma trn tng dn phi cp nht sau mi ln tnh
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Thay th SVC bng mt ngun dng bin thin Dng in qua SVC theo quan h vi tng dn
Ma trn tng dn khng cn cp nht nu SVC c m phng nhngun dng (bip thin)
236 Kt qu m phng hot ng ca SVC
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Thyristor Controlled Series Capacitor (TCSC)(FACTS devices Introduction & Applications)
237
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T b dc c iu khin
238 Thyristor Controlled Series Capacitor (TCSC)
M hnh l thuytn gin
MOV
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My ct: a TCSC vo hot ng/ct ra khi li khi c yu cu hoc s c.
in khng hn chdng in (L)
Bo v cho b t: gm nhiu cp
MOV (metaloxide varistor): in tr phi tuyn u song song bo v chng qu p
Ngn mch duy tr dng in ln c th lm hng MOV khe mi phng in K s hotng Dng ngn mch s chy qua K v my bin dng nu ti ngng tc ng atn hiu ng my ct MC ni tt cc phn t
Khi dao cch ly c th ng li ni tt lu di TCSC
T b dc c iu khin
239 Thyristor Controlled Series Capacitor (TCSC)
M hnh l thuytn gin
M hnh thc t:bao gm c cc
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thit b bo v
Thit b TCSC u tin hot ng nm 1996
TCSC gia tng tnh iu khin ca HT
Tng kh nng ti ca ng dyCi thin s vn hnh n nh ca HT
Dp dao ng (damping) tn s thp
Ngn nga sp in p (iu khin in p)
240 ng dng ca TCSC
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Tng cng n nh ca HT
241 ng dng ca TCSC
Cng sut truyn ti trn ng dy:
ng A & C: c tnh cng sut ng vi Xcmax& Xcmin
Ti thi im ct ngn mch TCSC c iu khin ti
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g
gi tr Xcmax nng c tnh cng sut ln ng Adin tch hm tc tng m bo n nh h thng vigc lch cho php ti max(nu khng iu khin gclch c th tng ti khoc mt n nh nu B thp hn)
Ti thi im gc lch bt u gim cn iu chnhTCSC th hin Xcmin gim din tch gia tc (theo chium) dao dng gc lch ch gim ti min
Sau 4 ln TCSC tc ng th h thng v n nh quanggi tr cn bng
TCSC gia tng tnh iu khin ca HT
iu khin dng cng sut, gim tn tht
242 ng dng ca TCSC
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Cc ch hot ng
243 Thyristor Controlled Series Capacitor (TCSC)
guy n o ng: ng r c a ng c
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Thay i gi tr in khng thng qua gc m ca thyristor
Cc ch hot ng Ch thyristor c m hon ton
Dng in l hnh sin
Tng tr ca TCSC c tnh cm khng do in dn B ca khng thng chn ln hn ca b t
Dng in hu ht i qua cun khng v ch mt phn nh chy qua b t c tc dng bov b t chng qu p khi c qa dng in.
244 Thyristor Controlled Series Capacitor (TCSC)
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Cc ch hot ng Ch thyristor kha hon ton
Van thyristor khng hot ng
TCSC th hin tnh dung khng: ca t b c nh
245 Thyristor Controlled Series Capacitor (TCSC)
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TSCS khng th hin vai tr trong ch hot ng ny Ch ny thng t dng (waiting mode)
Cc ch hot ng Ch thyristor c iu khin
Van thyristor thay i gc ng m trn di rng
TCSC th hin tnh dung khng hoc cm khng: ty theo gc m ca van thyristor
246 Thyristor Controlled Series Capacitor (TCSC)
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iu khin theo tng tr
Thng s dng ch iu khin khng phn hi (open loopcontrol)
L ch ph bin nht iu khin dng cng sut trn ng dy
247 Thut ton iu khin TSCS
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Gi tr mong mun ca mc bHoc dng cng sut mong mun
iu khin gi tng tr khng i Khu trdophn ngca TCSC(~15ms)
in khng tham chiu Xref
iu khin theo dng in khng i (constant current)
Thng s dng ch iu khin c phn hi (closedloop control)Gi tr dng in cn duy tr i lng tham chiu
248 Thut ton iu khin TSCS
a,b,c Qua b lc
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Dng intham chiu
Khu iukhin PI
Khu hn chin dn
Khu chuyn isang tn hiu
ng/m thyristor
iu khin theo dng in khng i (constant current)
Thng s dng ch iu khin c phn hi (closedloop control)Gi tr dng in cn duy tr i lng tham chiu
249 Thut ton iu khin TSCS
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Khu la chn ch vn hnh: Dng bo v TCSC
Khi c ngn mch: thyristor m hon ton (bypass mode) hn ch qu p
Trong qu trnh loi tr s c, TCSC ch ch (waiting mode)
iu khin theo gc truyn ti khng i (constant angle)
Thch hp s dng khi ng dy c TCSC vn hnh song song ving dy khc
Mc tiu iu khin: trong cc tnh hung s c ca h thng Gi cng sut trn ng dy song song khng i
Cho php cng sut trn ng dy c TCSC thay i
250 Thut ton iu khin TSCS
gi khng i dng cng sut phi duy tr gc truyn ti (gclch )
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iu khin tch hp thm chc nng dp tt dao ng
Mc tiu iu khin: Dp tt nhanh chng cc dao ng tn s thp
Tn hiu dng in qua khu vi phn a thm vo mch iukhin
251 Thut ton iu khin TSCS
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iu khin theo dng cng sut khng i (constant powerflow)
Mc tiu iu khin: gi dng cng sut khng i trn ng dy
252 Thut ton iu khin TSCS
Tnh cng sut
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Qui i v h vtng i
Khu tr
Gi tr cng suttham chiu
STATCOM (hoc SSC)(Static Synchronous Compensator)
253
100MVA STATCOM Installed at 345kV Substation, Korea
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