Đồ án thiết kế lưới điện

8/3/2019 n thit k li in

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n tt nghip thit k li in H T Tn DngHT3 - K45

PHn I: thit k li In khu vcCh ng 1 :cc la chn k thut c bn

I. Phn tch ngun v ph ti.I.1. Ngun in.

Khi thit k li in, vic u tin l cn phi nmbt c thng tin v ngun v ph ti. Do vy, phitin hnh phn tch nhng c im ca nguncung cp in v ph ti. Trn c s xc nhcng sut pht ca cc ngun cung cp v d kin ccphng n ni dy sao cho t c hiu qu kinh t -k thut cao nht.Li in cn thit k gm c hai ngun cung cp l hai

nh my nhit in nm cch xa nhau 180 km

cung cp in cho 9 ph ti. i vi cc nhmy nhit in, cc my pht in lm vic n nhkhi ph tiP 70%Pm, khi ph ti P < 30%Pm th ccmy pht ngng lm vic. Cng sut pht kinh t cacc my pht nhit in thng nm trong khong (80-85)%Pm.

Trong :NI: Gm 4 t my

Mi t my c cng sut Pm= 50 MW

H s cng sut cos = 0,85Tng cng sut ca NI: PNI= 4x50 MW

NII: Gm 3 t myMi t my c cng sut Pm= 50 MWH s cng sut cos = 0,85Tng cng sut ca NI: PNII= 3x50 MW

Tng cng sut t ca hai nh my:P =PNI +PNII =200+150 = 350 MW

I.2. Ph ti.Trong h thng in thit k c 9 ph ti, tt c u

l h loi I. Cc ph ti u yu cu iu chnh in pkhc thng v c h s cos = 0,85.

Thi gian s dng ph ti cc i Tmax = 5500 h. in pnh mc ca mng in th cp ca cc trm h p bng10 kV. Ph ti cc tiu bng 50% ph ti cc i.

Kt qu tnh gi tr cng sut ca cc ph ti trongch cc i v cc tiu cho trong bng sau:

Khoa in-Trng HBK H Ni 1


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Bng tng hp ph ti ch max v min

H tiu

th

Smax = Pmax +

jQmax

MVA

Smin = Pmin + jQmin

MVA

1

2

3

4

5

6

78

9

29 + j17,98

18 + j11,16

38 + j23,56

29 + j17,98

18 + j11,16

38 + j23,56

29 + j17,9818 + j11,16

29 + j17,98

14,5 +j 8,99

9 + j 5,58

19 + j11,78

14,5 +j 8,99

9 + j 5,58

19 + j11,78

14,5 + 8,999 + j 5,58

14,5 +j 8,99

Tng 246 +j152,52 123 +j76,26

S b tr ca ngun v cc ph ti nh hnh v:


NI NII

4

3

58

7

6

12 963,25km 60,83km

64,03km

100km

90km 90km

44,72km

60,83km

70,71km

63,25km

60,83km 100km

106,3km

53,85km

58,31km

44,72km

67,08km

64,03km56,57km

50km

70km


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Da vo s b tr cc ph ti cng nh cng sut ca

cc ph ti v v tr cng nh cng sut ca hai nh myin ta c nh hng c bn nh sau:

NI pht cho cc ph ti: 1,2,3,4,5

NII pht cho cc ph ti: 6,7,8,9

Do nh my NI c cng sut t 200MW cn nh myNII c cng sut t 150MW, nn ta s dng nh my NI

pht ch o cho cc ph ti phn cn li do nh my NIIcung cp. Do NI pht cng sut kh ln ng thi do phti phn b kh rng, gim tn tht cng sut v tntht in p ta chn ng dy lin lc gia hai nh my si qua 1 ph ti.

II. Chn in p nh mc ca mng in.

in p nh mc ca mng in quyt nh trctip n cc ch tiu kinh t - k thut ca mng in.

Khi tng in p nh mc th tn tht cng sut v tntht in nng s gim, ngha l gim chi ph vn hnh,gim tit din dy dn v chi ph v kim loi khi xydng mng in, ng thi tng cng sut gii hn truynti trn ng dy, nhng s lm tng vn u t xy dngmng in.

in p ca mng in ph thuc vo nhiu yu t:cng sut ca cc ph ti, khong cch gia cc ph ti vcc ngun cung cp, v tr tng i gia cc ph ti vi

nhau, s ca mng in ...Do vy cn phi la chnin p nh mc hp l cho tng mng in c th.C nhiu phng php khc nhau la chn in p

hp l cho mng in, mt phng php c p dng khrng ri l xc nh theo cng thc kinh nghim Style:

iii PLU .16.34,4 += kV

Trong :

L - chiu di ng dy (km)

P - cng sut truyn ti trn ng dy (MW)



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Cng thc ny p dng cho cc ng dy c chiu din 220 km v cng sut truyn ti P 60 MW.

Xc nh in p truyn ti cho tng nhnh, tnh tcc ph ti ti ngun gn nht:

p dng cho ph ti 1 ta c:89,9729.1672,44.34,4

1=+=U kV

Tnh tng t cho cc ph ti cn li ta c bng kt

qu:

Bng kt qu tnh in p tnh ton ca cc ng dy:

ng

dy

Chiu

di

km

Cng sut

ti

MVA

U tnh ton

kV

NI-1 44,72 29 + j17,98 97,89

NI-2 100 18+ j11,16 85,49

NI-3 53,85 38 + j23,56 111,65

NI-4 63,25 29 + j17,98 99,65

NI-5 106,3 18+ j11,16 86,18

NII-6 90 38 + j23,56 114,66NII-7 56,57 29 + j17,98 99,02

NII-8 70 18+ j11,16 82,12

NII-9 64,03 29 + j17,98 99,73

Vy ta chn in p nh mc ca mng in l Um

= 110 kV.

III.Cc la chn k thut:1.Kt cu li:



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Vi thi gian s dng cng sut cc i Tmax=5500h cth ni y l khu cng nghip dn c, chn h s ngthi m =1.

Mi trm phn phi c cp in bng:+ Hai ng dy song song t hai thanh ci c lp

ca trm phn phi nh my in hoc trm phn phitrung gian.

+ Mch vng kn gm nhiu ph ti, hai u mchvng ni vo ngun in hoc trm phn phi trung gian.

ng dy lin lc gia hai ngun in c thit kbng hai ng dy song song, cp in cho mt s trmph ti nm gia hai nh my in.

Khong cch t ngun n ph ti ln nn s dng ngdy truyn ti trn khng, tnh cht cc ph ti l quantrng nn c cp in t hai ngun.

Dy dn s dng l dy nhm li thp m bokh nng dn in, bn c v tnh kinh t.

Ct: tu theo v tr m s dng ct st hay ct ly tm

2.Kt cu trm:

Trm bin p trung gian cp in cho mi ph ti s c 2my bin p m bo cung cp in lin tc khi bo qunmt my bin p hoc khi s c mt my bin p. S dng

my ct ng ct v bo v cc my bin p.Ch ng 2 :Cn bng s b cng sut tc dng

v cng sut phn khng trong mng inI. Cn bng cng sut tc dng:

Do c im ca in nng l khng th tch trthnh s lng nhn thy c, sn xut bao nhiu tiu thby nhiu. Do vy ti mi thi im trong ch xc lpca h thng, cc nh my in cn phi pht cng sut

cn bng vi cng sut tiu th ca cc ph ti, k c tntht trong mng in, ngha l cn phi thc hin ngcn bng gia cng sut pht v cng sut tiu th.

Ngoi ra m bo cho h thng vn hnh bnh th-ng, cn phi c d tr cng sut tc dng trong h thng.

Cn bng cng sut tc dng c thc hin trong ch ph ti cc i ca h thng. m bo cn bngcng sut tc dng th tng cng sut pht ca cc nhmy in phi ln hn hoc bng cng sut yu cu:

PF Pyc= m. Pptmax + Pmd + Ptd + Pdt

Trong :



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PF: Tng cng sut pht ca 2 nh my in I v II

PF = PFI + PFII = 4.50 + 3.50 = 350 MW

Pyc: Cng sut yu cum: H s ng thi xut hin cc ph ti cc i

(m=1). Pmax: Tng cng sut tc dng ca cc ph ti trong

ch max

PPTmax = P1+ P2 + P3 +P4 +P5 +P6+P7 + P8+P9

= 29 +18 +38 +29 +18 + 38 +29 +18 +29=246 MW

Pmd: Tng tn tht cng sut tc dng trong mng

in, c th ly bng 10% tng cng sut cc i ca cc

ph ti.

Pm = 10.% PPTmax = 0,1.246 = 24,6MW

Ptd: Tng cng sut tc dng t dng trong nh my

nhit in, c th ly bng 8% (tng cng sut cc i

ca cc ph ti + tn tht trong li in):

Ptd =%( Pmax + Pmd)= 8%(246+24,6) = 21,648 MW

Pdt: Tng cng sut d tr, ly bng cng sut phtca t my ln nht, nu nh hn (10-15)% Ppt th lybng (10-15)% Ppt.

15%. Ppt = 15%.246 = 36,9 MW < 50 MW

Vy ta ly cng sut d tr bng cng sut 1 t my

Pdt = 50 MWSuy ra: Pyc = 246 + 24,6 + 21,648 + 50 = 342,248 MW

Nh vy PF > Pyc ngun in kh nng cung cpcho ph ti ngay c khi mt t my b s c.

II. Cn bng cng sut phn khng. gi tn s n nh ta phi cn bng cng sut

tc dng, gi n nh in p ta phi cn bng

cng sut phn khng:



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m bo cn bng cng sut phn khng th tngcng sut pht ca cc nh my in phi ln hn hocbng cng sut yu cu:

QF Qyc= m QPTmax + QB + QL - QC + Qtd +

QdtTrong :

QF: Tng cng sut phn khng do cc nh myin pht ra

QF = QFI + QFII = PFI.tg FI + PFII.tg FII= 4.50.0,62 + 3.50.0,62 = 217 MVAr

m: h s ng thi, ly m = 1 Qptmax: Tng cng sut phn khng ca ph ti trong

ch max Qptmax = PPTmax.tg pt= 246.0,62 = 152,52MVAr

QB: Tng tn tht cng sut phn khng trong mybin p

QB = 15%.Qptmax= 15%.152,52 = 22,878 MVAr QL: Tng tn tht cng sut phn khng trn cc

ng dy QC: Tng cng sut phn khng do in dung cc

ng dy sinh ra. Trong tnh ton s b, ta gi thit rngin p trn ng dy bng in p nh mc, ng

thi cng gi thit rng tt c cc ng dy s lm vic

trong ch cng sut t nhin. Do c th ly gn

ng QB = QC

Q td: Tng cng sut phn khng t dng ca cc nhmy in

Q td = Ptd.tg td= 21,648.0,75 = 16,236 MVAr Qdt: Tng cng sut phn khng d tr Qdt = Pdt.tg F = 50.0,62 = 31 MVAr

Suy ra: Qyc = 152,52 + 22,878 + 16,236 + 31 = 222,634 MVAr

Nh vy QF < Qyc cng sut phn khng do cc nguncung cp khng cho nhu cu cng sut phn khng caph ti nn ta phi b s b.



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III. B s b cng sut phng khng:S thiu ht cng sut phn khng ng hng trc tip

n cht lng in nng, do vic t cc thit b btrong h thng in l ht sc cn thit. Tuy nhin y khi nh hng nhiu n kt qu la chn dy dn,my bin p, tnh ton tn tht in nng ca mng in,ta d kin b s b trn nguyn tc: u tin cho cc h xac cos thp v b n khong cos = 0,95.

Tng cng sut phn khng phi b:

QB = Qyc - QF = 222,634 - 217 = 5,634 MVArTrong trng hp ny lng cng sut phn khng phi b

khng ln lm nn ta ch b cho ph ti 5 c khong cchn ngun xa nht l5=106,3km.

tg 5 =5

5

P

QQB

=18

634,516,11 = 0,307

cos 5 = 0,956

Bng s liu tnh ton s b

Phti

1 2 3 4 5 6 7 8 9

PMax 29 18 38 29 18 38 29 18 29

cos 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85

QMaxtb 17,98

11,16

23,56

17,98

11,16

23,56

17,98

11,16

17,98

Qb 0 0 0 0 5,634

0 0 0 0

QMaxsb 17,98

11,16

23,56

17,98

5,526

23,56

17,98

11,16

17,98

cos sb 0,85 0,85 0,85 0,85 0,956

0,85 0,85 0,85 0,85



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Ch ng 3 :thnh lp cc phng n li in tnhton k thut cc phng n

I. D kin phng thc vn hnh cc nh my in:

Phng thc vn hnh cc nh my in trong h thngphi tha mn iu kin vn hnh kinh t nhm mc chgim chi ph in nng.

Vic xc nh phng thc vn hnh bao gm: d kins t my lm vic v cng sut pht ca cc nh myin trong cc ch vn hnh khc nhau.1. Ch ph ti max:

V c hai nh my u l nhit in v cng sut mtt my l nh nhau nn c tnh kinh t ca hai nh myl nh nhau. Do ta cho hai nh my pht cng sut gnbng nhau. trong qu trnh vn hnh sao cho cc nhmy vn hnh kinh t th ta phi a ra phng thc vnhnh. i vi nh my nhit in th hiu sut pht kinht l 80%-85% v lm vic n nh khi P >70% Pdm.

Nh my in I c tng cng sut pht ln hn nn tachn nh my in I lm nh my in pht c s cnnh my in II l nh my in cn bng.

Cho nh my in I pht 85% cng sut nh mc can ta c:

PI-F = 85%.200 = 170 MW

Cng sut pht ln h thng ca nh my in I:

PI-HT = PI-F - PI-td = 170 - 8%.170 = 156,4 MW

Cng sut pht ln h thng ca nh my in II vokhong:

PII-HT = Pptmax + Pptmax - PI-HT

= 246 + 10%.246 - 156,4 = 114,2 MW

Cng sut pht ca nh my in II vo khong:PII-F = PII-HT + PII-td = 114,2 + 8%.PII-F

PII-F = 92,02,114

= 124,13 MW

Nh vy nh my in II s pht vo khong %100.150

13,124=

82,75% cng sut nh mc ca n.

2. Ch ph ti min:

Trong ch min cng sut ca ph ti gim i mtna do :



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Pycmin = PPTmin + Pmdmin + Ptdmin + Pdt= 0,5. PPTmax+10%. Pmdmin+ 8%.( PPTmin +

Pmdmin)+ Pdt= 123 + 10%.123 + 8%.(123 + 12,3) + 50 =

196,124 MWNh vy ta s ct bt 2 t my ca NI v 1 t my caNII. Khi tng cng sut pht ca c hai nh my l:

PFmin = 2.50 +2.50 = 200 MW PFmin > Pycmin nn khng b thiu cng sut

tc dngTrong ch ny ta cho NI pht 74% cng sut nh

mc ca n.

PI-Fmin =74%.100 = 74 MWCng sut pht ln h thng ca nh my in I:

PI-HTmin = PI-Fmin - PI-tdmin= 74 - 8%.74 = 68,08 MW

Cng sut pht ln h thng ca nh my in II vokhong:

PII-HTmin = PPTmin + PPTmin - PI-HTmin

= 123 + 10%.123 - 68,08 = 67,22 MWCng sut pht ca nh my in II vo khong:

PII-Fmin = PII-HTmin + PII-tdmin = 67,22 + 8%.PII-F

PII-Fmin = 92,022,67

= 73,07 MW

Nh vy nh my in II s pht vo khong %100.100

07,73=

73,07% cng sut nh mc ca n.3. Ch s c:

Trong ch ny ta gi s 1 t my ca NII ngnglm vic. Khi ta cho NII pht 100% cng sut nhmc ca n

PII-Fsc = 100%.100 = 100 MWCng sut pht ln h thng ca nh my in II:

PII-HTsc = PII-Fsc - PII-tdsc= 100 - 8%.100 = 92 MW

Cng sut pht ln h thng ca nh my in I vo

khong:



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PI-HTsc = PPTmax + PPTmax - PII-HTsc= 246 + 10%.246 - 92 = 178,6 MW

Cng sut pht ca nh my in I vo khong:

PI-F = PI-HT + PI-td = 178,6 + 8%.PI-F

PII-F = 92,06,178 = 194,13 MW

Nh vy nh my in I s pht vo khong %100.200

13,194=

97,07% cng sut nh mc ca n.

Bng tng kt cc phng thc vn hnh s b ca ccnh my in

Ch

ph ti

Nhmy

Cng sutpht

tng(MW)

Cng sutpht lnHT(MW)

Cngsut

pht %

S tmylmvic

Max I 170 156,4 85 4x50

II 124,13 114,2 82,75 3x50

Min I 74 68,08 74 2x50

II 73,07 67,22 73,07 2x50

S c I 194,13 178,6 97,07 4x50

II 100 92 100 2x50



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II. Phng php chung tnh ton k thut cc phng n.

1. Phng php chung tnh chn dy dn v cc tiuchun k thut.Tit din dy dn ca mng in cn phi c chn

sao cho chng ph hp vi quan h ti u gia chi ph u t

xy dng ng dy v chi ph v tn tht in nng.Xc nh quan h ti u ny l vn kh phc tp v trthnh bi ton tm tit din dy dn tng ng vi cc chiph qui i nh nht. Nhng trong thc t ngi ta thngdng gii php n gin hn xc nh tit din dydn. l phng php chn tit din dy dn theo mt kinh t ca dng in. chn tit din dy dn theomt kinh t ca dng in trc ht cn xc nh Jkt ,sau tnh tit din kinh t theo cng thc:

Fkt =ktJI

Trong :I: Dng in tnh ton chy trn ng dy trong ch

ph ti ln nht (A)Jkt: Mt kinh t ca dng in (A/mm2)

Trong n ny ta s dng dy dn trn, dy nhmli thp, cc ph ti u c thi gian s dng cng sut lnnht l 5500h.

Tra bng ta c:Jkt = 1 [A/mm

2

]Mt kinh t ca dng in c p dng chntit din cc ng dy trn khng in p 6-500 kV v



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cc ng dy cp in p ln hn 1kV. Sau khi chn titin tiu chun cn tin hnh kim tra tit din chntheo iu kin vng quang, theo iu kin bn c,theo iu kin pht nng v theo tn tht cho php cain p ( UCP).

2. Phng php chung tnh ton k thut cc phngn.

Tnh dng in chy trn cc nhnh. Nu l mch vngkn th phi tnh phn b cng sut.

Tnh tit din kinh t.Chn tit din tiu chun gn nht.Kim tra iu kin vng quang, nu tit din dy

chn < 70 mm2 th phi chn dy c tit din = 70 mm2

Kim tra iu kin pht nng khi s c t mt mchca ng dy kp hoc t mt ng dy trong mchvng kn. Nu l ng dy lin lc gia 2 nh my thphi kim tra 2 trng hp: t mt mch ca ng dy linlc v trng hp s c mt t my.

Tnh tn tht in p trong ch bnh thng.Cng thc tnh tn tht in p t ngun n ph ti

i:

%100.

..

dm

Di

jj

Di

jj

Di

jiU

XQRP

UU

+

==

Trong :

Ui: Tn tht in p t ngun n nt i Uj: Tn tht in p trn ng dy iDi: Tp hp cc ng dy ni ngun vi nt iPi(MW), Qi(MVAr) : Cng sut trn ng dy i

Ri , Xi ( ): in tr, in khng ca ng dy j (k c 2mch nu c)Tnh tn tht in p t ngun n tt c cc ph ti,

sau chn tn tht in p ln nht l tn tht in ptrong ch bnh thng ca phng n.

Ubt max = max{ Ui}Tnh tn tht in p khi s c nng n nht.

+ Cc ng dy cp in cho 1 ph ti: tnh s c

t mt mch ca ng dy kp.



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+ Cc ng dy cp in cho 2 ph ti tr ln: tnhs c t mt mch ca ng dy kp ni n ph tiu tin.

+ Mch vng kn th tnh khi t on ni vongun c tng tr nh nht.

+ ng dy lin lc phi tnh 2 trng hp: t mtmch ca ng dy lin lc v trng hp s c mt t my.

Trong trng hp s c m t my, nu im phn chiacng sut l nt gia th tnh tn tht in p n ntny, nu cng sut i t nh my ny sang nh my kiath phi tnh tn tht in p gia 2 nh my.

Sau khi tnh cc trng hp ring ta chn gi tr ln nht ltn tht in p khi s c ca phng n.

USCmax = max{ UiSC}



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III .Tnh ton k thut cho cc phng n c th:1.Phng n I1.1:S ni dy.

1.2. Xc nh tit din dy dn ca cc on ng dy.

Tnh dng cng sut chy trn ng dy linlc:

PI-6 = PI-HT - (P1 + P2 + P3 + P4 + P5 + P1 + P2 + P3+ P4 + P5)

= 156,4 - (132 + 10%.132) = 11,2 MWQII-6 = QI-HT - (Q1 + Q2 + Q3 + Q4 + Q5 +

Q1+ Q2+ Q3+ Q4+ Q5)= 156,4.0,62 - (76,206 + 15%.76,206) = 9,33

MVArPII-6 = P6 - PI-6= 38 11,2= 26,8 MW

QII-6 = Q6 QI - 6 =23,56 9,33 =14,23 MVAr


NI NII

4

3

58

7

6

1

29


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Bng tng kt dng cng sut chy trn cc nhnh PAI:on P(MW) Q(MVAr) S(MVA)

I-1 29 17,98 29 +j17,98

I-2 18 11,16 18 +j11,16

I-3 38 23,56 38 +j23,56

I-4 29 17,98 29 +j17,98

I-5 18 5,526 18 +j5,526I-6 11,2 9,33 11,12+j9,33

II-6 26,8 14,23 26,8+j14,23

II-7 29 17,98 29 +j17,98

II-8 18 11,16 18 +j11,16

II-9 29 17,98 29 +j17,98

Xc nh tit din dy dn ca cc on ng dy:

on I - 1:

II-1= 322

3

2

1

2

110

110.3.2

98,172910.

.3.2

+=

+

dm

II

U

QP= 89,54 A

ISC = 2.II-1 = 179,08 A

Fkt = 154,891 =

kt

I

J

I

= 89,54 mm2

Vy ta chn dy AC-95 c Ftc = 95 mm2

vi ICP = 330 A > ISC = 179,08A

on I - 2:

II-2= 322

3

2

2

2

210

110.3.2

16,111810

.3.2

+=

+

dm

II

U

QP= 55,57 A

ISC = 2.II-2 = 111,14 A

Fkt =1

57,552 =

kt

I

J

I= 55,57 mm2



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m bo iu kin vng quang ta chn dy AC-70 c Ftc = 70 mm2 vi ICP = 265 A > ISC = 111,14 A

on I - 3:

II-3= 322

3

2

3

2

310

110.3.2

56,233810

.3.2

+=

+

dm

II

U

QP=117,34 A

ISC = 2.II-3 = 234,68 A

Fkt = 134,1173 =

kt

I

J

I= 117,34 mm2


vi ICP = 380 A > ISC = 234,68 A

on I - 4:

II-4= 322

3

2

4

2

4 10110.3.2

98,172910.

.3.2

+=

+

dm

II

U

QP= 89,54 A

ISC = 2.II-4 = 179,08 A

Fkt = 154,894 =

kt

I

J

I= 89,54 mm2

Vy ta chn dy AC-95 c Ftc = 95 mm2 vi ICP = 330 A >

ISC = 179,08A on I - 5:

II-5= 322

3

2

5

2

510

110.3.2

526,51810

.3.2

+=

+

dm

II

U

QP= 49,41 A

ISC = 2.II-5 = 98,82A

Fkt = 141,495 =

kt

I

J

I= 49,41 mm2


on I - 6:

II-6= 322

3

2

6

2

610

110.3.2

33,92,1110

.3.2

+=

+

dm

II

U

QP= 38,25 A

ISC = 2.II-6 = 76,5 A

Fkt = 125,386

=

kt

I

J

I

= 38,25 mm2



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on II - 6:

III-6= 322

3

2

6

2

610

110.3.2

23,148,2610

.3.2

+=

+

dm

IIII

U

QP= 79,63 A

ISC = 2.III-6 = 159,26 A

Fkt =1

63,791 =

kt

I

J

I= 79,63 mm2


vi ICP = 330 A > ISC = 159,26 A

on II - 7:

III-7= 322

3

2

7

2

710

110.3.2

98,172910.

.3.2

+=

+

dm

IIII

U

QP= 89,54 A

ISC = 2.III-7 = 179,08 A

Fkt =1

54,897 =

kt

II

J

I= 89,54 mm2

Vy ta chn dy AC-95 c Ftc = 95 mm2 vi ICP = 330 A >ISC = 179,08 A

on II - 8:

III-8= 322

3

2

8

2

810

110.3.2

16,111810

.3.2

+=

+

dm

IIII

U

QP= 55,57 A

ISC = 2.III-8 = 111,14 A

Fkt = 157,558=

kt

II

JI = 55,57 mm2

m bo iu kin vng quang ta chn dy AC-70c Ftc = 70 mm2 vi ICP = 265 A > ISC = 111,14 A

on II - 9:

III-9= 322

3

2

9

2

910

110.3.2

98,172910

.3.2

+=

+

dm

IIII

U

QP= 89,54 A

ISC = 2.III-9 = 179,08 A



19/149


Fkt = 154,899 =

kt

II

J

I= 89,54 mm2

Vy ta chn dy AC-95 c Ftc = 95 mm2 vi ICP = 330 A > ISC= 179,08 A

Bng tng kt chn dy dn cho phng n I

on S (MVA) Ilv(A) Fkt(mm2)

Fkt(mm2)

ISC(A) ICP(A)

I-1 29+j17,98

89,54 89,54 95 179,08

330

I-2 18

+j11,16

55,57 55,57 70 111,1

6

265

I-3 38+j23,56

117,34

117,34 120 234,68

380

I-4 29+j17,98

89,54 89,54 95 179,08

330

I-5 18+j5,526

49,41 49,41 70 98,82 265

I-6 11,12+j9,33 38,25 38,25 70 67,5 265

II-6 26,8+j14,23

79,63 79,63 95 159,26

330

II-7 29+j17,98

89,54 89,54 95 179,08

330

II-8 18

+j11,16

55,57 55,57 70 111,1

6

265

II-9 29+j17,98

89,54 89,54 95 179,08

330

1.3: Tnh tn tht in p trong ch bnh th-ng v s c:

Bng thng s ca cc l ng dy PAI

on l(km

)

Ftc

(mm2

)

r0

( /km)

x0

( /km)

b0.10-

6

(S/km

R(

)

X(

)

B/2.10-6

(S)



20/149


)

I - 1 44,72

95 0,33 0,429 2,65 7,38 9,59 118,5

I - 2 100 70 0,46 0,44 2,58 23 22 258

I - 3 53,85

120 0,27 0,423 2,69 7,27 11,39

144,9

I - 4 63,25

95 0,33 0,429 2,65 10,44

13,57

167,6

I - 5 106,3

70 0,46 0,44 2,58 24,45

23,39

274,3

I - 6 90 70 0,46 0,44 2,58 20,7 19,8 232,2

II - 6 90 95 0,33 0,429 2,65 14,85

19,31

238,5

II -7 56,57

95 0,33 0,429 2,65 9,33 12,13

149,9

II - 8 70 70 0,46 0,44 2,58 16,1 15,4 180,6

II - 9 64,03

95 0,33 0,429 2,65 10,57

13,73

169,7

Tn tht in p t NI n ph ti 1:

00

2

2

1111

1

12,3100110

59,9.98,1738,7.29

100..

%

=+

=

+

= dm

II

btI

U

XQRPU

Khi c s c t 1 mch trn on I - 1.

00

2

2

1111

1

24,6100110

)16,11.98,1715,9.29.(2

100)...(2

%

=+

=

+

= dm

II

scIU

XQRPU




21/149


00

2

2

2222

2

45,5100110

22.16,1123.18

100...

%

=+

=

+=

dm

II

btIU

XQRPU


00

2

2

2222

2

9,10100110

)22.16,1123.18.(2

100)...(2

%

=+

=

+

= dm

II

scIU

XQRPU


00

2

23333

3

5,4100110

39,11.56,2327,7.38

100...%

=+

=

+=

dm

IIbtI

UXQRPU


0

0

2

2

3333

3

9100.110

)39,11.56,2327,7.38.(2

100)...(2

%

=+

=

+

= dm

II

scIU

XQRPU


00

2

2

4444

4

52,4100110

57,13.98,1744,10.29

100..

%

=+

=

+

= dm

II

btIU

XQRPU


00

2

2

4444

4

02,9100110

)57,13.98,1744,10.29.(2

100)...(2

%

=+

=

+

= dm

IIbtI

U

XQRPU




22/149


00

2

2

5555

5

7,4100110

39,23.16,1145,24.18

100...

%

=+

=

+=

dm

IIII

btIIU

XQRPU


00

2

2

5555

5

4,9100110

)39,23.16,1145,24.18.(2

100)...(2

%

=+

=

+

= dm

IIII

scIIU

XQRPU

Tn tht in p t NII n ph ti 7:

00

2

2

7777

7

04,4100110

13,12.98,1733,9.29

100..

%

=+

=

+= dm

II

btIU

XQRPU

Khi c s c t 1 mch trn on II - 7.

00

2

2

7777

7

08,8100110

)13,12.98,1733,9.29.(2

100)...(2

%

=+

=

+

= dm

II

scIU

XQRPU


00

2

2

8888

8

82,3100110

4,15.16,111,16.18

100...

%

=+

=

+=

dm

IIII

btIIU

XQRPU


00

2

2

5555

5

64,7100110

)4,15.16,111,16.18.(2

100)...(2

%

=+

=

+

= dm

IIII

scIIU

XQRPU




23/149


00

2

2

9999

9

57,4100110

73,13.98,1757,10.29

100..

%

=+

=

+

= dm

II

btIU

XQRPU


00

2

2

9999

9

14,9100110

)73,13.98,1757,10.29.(2

100)...(2

%

=+

=

+

= dm

IIscI

U

XQRPU

Tn tht in p trn ng dy lin lc NI

- 6 - NII:

Tn tht in p t NI n ph ti 6 trong ch bnh thng:

00

2

2

6666

6

44,3100110

8,19.33,97,20.2,11

100..

%

=+

=

+

= dm

IIII

btIU

XQRPU

Tn tht in p t NII n ph ti 6 trong ch bnh thng:

00

2

2

6666

6

56,5100110

31,19.23,1485,14.8,26

100..

%

=+

=

+

= dm

IIIIIIII

btIIU

XQRPU

Tn tht in p t NI n ph ti 6 khi s c t 1mch trn on I-6:

00

2

2

6666

6

88,6100110

)8,19.33,97,20.2,11.(2

100)...(2

%

=+

=

+

= dm

IIII

btIU

XQRPU

Tn tht in p t NII n ph ti 6 khi s c t 1mch trn on II-6:



24/149


00

2

2

6666

6

12,11100110

)31,19.23,1485,14.8,26.(2

100)...(2

%

=+

=

+

= dm

IIIIIIII

btIIU

XQRPU

Khi s c mt t my ca NII th dng cng sutchy trn ng dy lin lc:

PI-6 = PI-HTsc - (P1 + P2 + P3 + P4 + P5+ P1 + P2 + P3+ P4 + P5 )

= 178,6 - (132 + 10%.132) = 33,4 MW

QI-6 = QI-HTsc - (Q1 + Q2 + Q3 + Q4 + Q5+ Q1 + Q2 + Q3+ Q4 + Q5 )

= 178,6.0,62 - (76,206 + 15%.76,206) = 23,095

MWPII-6 = P6 - PI-6 = 38 33,4 = 4,6 MW

QII-6 = Q6 - QI-6 = 23,56 23,095 = 0,465 MVAr

Tn tht in p t NI n ph ti 6 khi s c 1t my NII:

00

2

2

6666

6

49,9100110

8,19.095,237,20.4,33

100..

%

=+

=

+

= dm

IIII

scI

U

XQRPU

Tn tht in p t NII n ph ti 6 khi s c 1t my NII:

00

2

2

6676

6

64,0100110

31,19.465,085,14.6,4

100..

%

=+=

+

= dm

IIIIIIII

scIIU

XQRPU



25/149


Bng tng kt tn tht in p ca phng n Ion S(MVA) R( ) X( ) Ubt% Usc%

I - 1 29+j17,98

7,38 9,59 3,12 6,24

I - 2 18+j11,16

23 22 5,45 10,9

I - 3 38+j23,56

7,27 11,39 4,5 9

I - 4 29+j17,98

10,44 13,57 4,52 9,04

I - 5 18+j5,526

24,45 23,39 4,7 9,4

I - 6 11,12+j9,33

20,7 19,8 3,05 9,57

II - 6 26,8+j14,23

14,85 19,31 5,56 11,12

II -7 29+j17,98

9,33 12,13 4,04 8,08

II - 8 18 16,1 15,4 3,82 7,64



26/149


+j11,16

II - 9 29+j17,98

10,57 13,73 4,57 9,14

Nh vy tn tht in p ln nht trong ch bnhthng l tn tht in p t NII n ph ti 6, tn thtin p ln nht trong ch s c l tn tht in p tNII n ph ti 6 khi t mt mch trn on II - 6.

Ubtmax% = 5,56 %

Uscmax% = 11,12 %



27/149


2.Phng n II2.1:S ni dy.


Bng tng kt dng cng sut chy trn cc nhnh PAII

on P(MW) Q(MVAr) S(MVA)I-1 47 29,14 47+j29,14

1-2 18 11,16 18 +j11,16

I-3 56 29,086 56+j29,086

3-5 18 5,526 18 +j 5,526

I-4 29 17,98 29 +j17,98

I-6 11,2 9,33 11,12+j9,33

II-6 26,8 14,23 26,8+j14,23

II-7 29 17,98 29 +j17,98

II-8 18 11,16 18 +j11,16

II-9 29 17,98 29 +j17,98


NI NII

4

3

58

7

6

1

29


28/149


Bng tng kt chn dy dn cho phng n II

on S (MVA) Ilv(A) Fkt(mm2

)Fkt(mm2

)ISC(A) ICP(A)

I-1 47+j29,14 145,1 145,1 150 290,2

445

1-2 18+j11,16

55,57 55,57 70 111,16

265

I-3 56+J29,086

165,6 165,6 185 331,2

510

3-5 18 +j

5,526

89,54 89,54 95 179,

08

330

I-4 29+j17,98

49,41 49,41 70 98,82

265

I-6 11,12+j9,33

38,25 38,25 70 67,5 265

II-6 26,8+j14,23

79,63 79,63 95 159,26

330

II-7 29+j17,98

89,54 89,54 95 179,08

330

II-8 18+j11,16

55,57 55,57 70 111,16

265

II-9 29+j17,98

89,54 89,54 95 179,08

330


Bng thng s ca cc l ng dy PAII

on l(km)

Ftc(mm2

)

r0( /km)

x0( /km)

b0.10-6

(S/km)

R()

X()

B/2.10-6 (S)

I - 1 44,72 150 0,21 0,416 2,74 4,7 9,3 122,5



29/149


1 -2

63,25

70 0,46 0,44 2,58 14,55

13,92

163,2

I - 3 53,85

185 0,17 0,409 2,84 4,58 11,01

152,9

3 -5

58,31

70 0,46 0,44 2,58 13,41

12,83

150,4

I - 4 63,25

95 0,33 0,429 2,65 10,44

13,57

167,6

I - 6 90 70 0,46 0,44 2,58 20,7 19,8 232,2

II - 6 90 95 0,33 0,429 2,65 14,85

19,31

238,5

II -7 56,57

95 0,33 0,429 2,65 9,33 12,13

149,9

II - 8 70 70 0,46 0,44 2,58 16,1 15,4 180,6

II - 9 64,03

95 0,33 0,429 2,65 10,57

13,73

169,7

Bng tng kt tn tht in p ca phng n II

on S(MVA) R( ) X( ) Ubt% Usc%

I-1 47+j29,14

4,7 9,3 4,07 11,59

1-2 18+j11,16

14,55 13,92 3,45

I-3 56+j29,086

4,58 11,01 4,77 12,12

3-5 18 +j5,526

13,41 12,83 2,58

I-4 29+j17,98

10,44 13,57 4,52 9,02

I-6 11,12+j

9,33

20,7 19,8 3,44 9,49

II-6 26,8+j14, 14,85 19,31 5,56 11,12



30/149


23

II-7 29+j17,98

9,33 12,13 4,04 8,08

II-8 18+j11,16 16,1 15,4 3,82 7,64

II-9 29+j17,98

10,57 13,73 4,57 9,14

Nh vy tn tht in p ln nht trong ch bnhthng l tn tht in p t NI n ph ti 2, tn tht

in p ln nht trong ch s c l tn tht in p tNI n ph ti 5 khi t mt mch trn on I -3.

Ubtmax% = 7,52 %

Uscmax% = 12,12 %



31/149


3.Phng n III3.1:S ni dy.

3.2. Xc nh tit din dy dn ca cc on ng dy.Bng tng kt dng cng sut chy trn cc nhnh PAIII

on P(MW) Q(MVAr) S(MVA)

I-1 47 29,14 47+j 29,14

1-2 18 11,16 18+j11,16

I-3 38 23,56 38+j 23,56

I-4 47 23,506 47+j23,056

4-5 18 5,526 18 +j 5,526

I-6 11,2 9,33 11,12+j9,33

II-6 26,8 14,23 26,8+j14,23

II-7 29 17,98 29 +j17,98

II-8 18 11,16 18 +j11,16

II-9 29 17,98 29 +j17,98


NI NII

4

3

58

7

6

1

29


32/149


Bng tng kt chn dy dn cho phng n IIIon S (MVA) Ilv(A) Fkt(mm2

)Fkt(mm2

)ISC(A) ICP(A)

I-1 47+j29,14 145,1 145,1 150 290,

2

445

1-2 18+j11,16

55,57 55,57 70 111,16

265

I-3 38+j23,56

117,34

117,34 120 234,68

380

I-4 47+j23,056

137,9 137,9 150 275,8

445

4-5 18 +j5,526

49,41 49,41 70 98,82

265

I-6 11,12+j9,33

38,25 38,25 70 67,5 265

II-6 26,8+j14,23

79,63 79,63 95 159,26

330

II-7 29

+j17,98

89,54 89,54 95 179,

08

330

II-8 18+j11,16

55,57 55,57 70 111,16

265

II-9 29+j17,98

89,54 89,54 95 179,08

330


Bng thng s ca cc l ng dy PAIII

on L(km)

Ftc(mm2

)

r0( /km)

x0( /km)

b0.10-6

(S/km)

R()

X()

B/2.10-6 (S)

I - 1 44,7

2

150 0,21 0,416 2,74 4,7 9,3 122,5

1 - 63,2 70 0,46 0,44 2,58 14,5 13,9 163,2



33/149


2 5 5 2

I - 3 53,85

120 0,27 0,423 2,69 7,27 11,39

144,9

I - 4 63,25 150 0,21 0,416 2,74 6,64 13,16 173,3

4 -5

60,83

70 0,46 0,44 2,58 14 13,38

156,9

I - 6 90 70 0,46 0,44 2,58 20,7 19,8 232,2

II - 6 90 95 0,33 0,429 2,65 14,85

19,31

238,5

II -7 56,57 95 0,33 0,429 2,65 9,33 12,13 149,9

II - 8 70 70 0,46 0,44 2,58 16,1 15,4 180,6

II - 9 64,03

95 0,33 0,429 2,65 10,57

13,73

169,7

Bng tng kt tn tht in p ca phng n III


I-1 47+j29,14

4,7 9,3 4,07 11,19

1-2 18+j11,16

14,55 13,92 3,45

I-3 38+j23,56 7,27 11,39 4,5 9

I-4 47+j23,056

6,64 13,16 5,14 12,97

4-5 18 +j5,526

14 13,38 2,69

I-6 11,12+j

9,33

20,7 19,8 3,44 9,49

II-6 26,8+j14, 14,85 19,31 5,56 11,12



34/149


23

II-7 29+j17,98

9,33 12,13 4,04 8,08

II-8 18+j11,16 16,1 15,4 3,82 7,64

II-9 29+j17,98

10,57 13,73 4,57 9,14

Nh vy tn tht in p ln nht trong ch bnhthng l tn tht in p t NI n ph ti 5, tn tht

in p ln nht trong ch s c l tn tht in p tNI n ph ti 5 khi t mt mch trn on I -3.

Ubtmax% = 7,83 %

Uscmax% = 12,97 %

4.Phng n IV:4.1:S ni dy.


NI NII

4

3

58

7

6

1

29


35/149


4.2. Xc nh tit din dy dn ca cc on ng dy.Tnh phn b cng sut trong mch vng kn II

- 6 - 5:

Gi thit cc on ng dy c tit din gingnhau. Ta c th tnh cng sut truyn ti trn cc onng dy nh sau:

Dng cng sut chy trn on II-7:

7878

888877

7

.).(

LLL

LSLLSSII

++

++=

57,565070

70).16,1118()7050).(98,1729(7

++

++++=

jjSII

= 26,84 + j16,64 MVADng cng sut chy trn on II - 8:

7788

777788

8

.).(

LLL

LSLLSSII

++

++=

57,565070

57,56)98,1729()57,5650).(16,1118(8

++

++++=

jjSII

= 20,16 + j12,5 MVA

Dng cng sut chy trn on 8 - 7:

S8-7 = SII-7 S7 = 29 + j17,98 - (26,84 +j16,64)

= 2,16 + j1,34 MVA

Bng tng kt dng cng sut chy trn cc nhnh PAIV


I-1 47 29,14 47+j 29,14

1-2 18 11,16 18+j11,16



36/149


I-3 38 23,56 38+j 23,56

I-4 47 23,506 47+j23,056

4-5 18 5,526 18 +j 5,526I-6 11,2 9,33 11,12+j

9,33

II-6 26,8 14,23 26,8+j14,23

II-8 20,16 12,5 20,16+j12,5

8-7 2,16 1,34 2,16+j1,34II-7 26,84 16,64 26,84+j16,

64

II-9 29 17,98 29 +j17,98

Xc nh tit din dy dn trong mch vng kn:

on II - 7:

III-7= 322

3

2

7

2

710

110.3

64,1684,2610

.3

+=

+

dm

IIII

U

QP= 165,7 A

Fkt =1

7,1656 =

kt

II

J

I= 165,7 mm2

Vy ta chn dy AC-150 c Ftc = 150 mm2 vi ICP = 445 A

on II - 8:

III-8= 322

3

2

8

2

810

110.3

5,1216,2010

.3

+=

+

dm

IIII

U

QP= 124,5 A

Fkt = 15,1246 =

kt

II

J

I= 124,5 mm2

Vy ta chn dy AC-120 c Ftc = 120 mm2 vi ICP = 380A

on 8 - 7:



37/149


I8-7= 322

3

2

78

2

7810

110.3

34,116,210

.3

+=

+

dmU

QP= 13,34 A

Fkt = 134,1378 =

ktJ

I= 13,34 mm2

m bo iu kin vng quang ta chn dy AC-70 cFtc = 70 mm2

Tnh dng in s c trong mch vng kn:Tr ng hp 1 : t on dy II-7

IscII-7= 322

3

2

7

2

710

110.3

)16,1198,17()1829(10

.3

+++

=+

dm

IIII

U

QP= 290,2 A

Isc8-7= 322

3

2

78

2

7810

110.3

98,172910

.3

+=

+

dmU

QP= 179,1 A

Tr ng hp 2 : t on dy II-8

IscII-8= 322

3

2

8

2

810

110.3

)16,1198,17()1829(10

.3

+++

=+

dm

IIII

U

QP= 290,2 A

Isc7-8= 322

3

2

87

2

8710

110.3

16,111810

.3

+=

+

dmU

QP= 111,1 A

Bng tng kt chn dy dn cho phng n IV


) Fkt(mm2) I

SC(A) ICP(A)



38/149


I-1 47+j29,14 145,1 145,1 150 290,2

445

1-2 18 +j11,16 55,57 55,57 70 111,16

265

I-3 38+j 23,56 117,34

117,34 120 234,68

380

I-4 47+j23,056

137,9 137,9 150 275,8

445

4-5 18 +j5,526

49,41 49,41 70 98,82

265

I-6 11,12+j9,33

38,25 38,25 70 67,5 265

II-6 26,8+j14,23

79,63 79,63 95 159,26

330

II-8 20,16+j12,5

124,5 124,5 120 290,2

380

8-7 2,16+j1,34 13,34 13,34 70 179,1

265

II-7 26,84+j16,64

165,7 165,7 150 290,2

445

II-9 29 +j17,98 89,54 89,54 95 179,08

330

Bng thng s ca cc l ng dy PAIVon l(km

)

Ftc

(mm2)

r0

( /km)

x0

( /km)

b0.10-

6

(S/km)

R(

)

X(

)

B/2.10

-6 (S)

I - 1 44,72

150 0,21 0,416 2,74 4,7 9,3 122,5

1 -2

63,25

70 0,46 0,44 2,58 14,55

13,92

163,2

I - 3 53,85

120 0,27 0,423 2,69 7,27 11,39

144,9



39/149


I - 4 63,25

150 0,21 0,416 2,74 6,64 13,16

173,3

4 -5

60,83

70 0,46 0,44 2,58 14 13,38

156,9

I - 6 90 70 0,46 0,44 2,58 20,7 19,8 232,2

II - 6 90 95 0,33 0,429 2,65 14,85

19,31

238,5

II-8 70 120 0,27 0,423 2,69 18,9 29,61

94,15

8-7 50 70 0,46 0,44 2,58 23 22 64,5

II-7 56,57 150 0,21 0,416 2,74 11,9 23,53 77,5

II - 9 64,03

95 0,33 0,429 2,65 10,57

13,73

169,7


Tnh tn tht in p trong mch vng II-7-8-II:Ta c im 7 l im phn cng sut ca vng kn.Khi bnh th ng:

00

2

2

77777

88,5100110

53,23.64,169,11.84,26

100..

%

=+

=

+

= dm

IIII

IIU

XQRPU

00

2

2

88888

2,6100110

61,29.5,1223.16,20

100..

%

=+

=

+

= dm

IIIIII

U

XQRPU

00

2

2

7878787878

65,0100110

22.34,123.16,2

100..

%

=+

=

+

= dmU

XQRPU

Khi s c:Tr ng hp 1: t on dy II-7



40/149


00

2

2

78787878888878

25,23100110

22.98,1723.2961,29.14,299,18.47

100....

%

=+++

=

+++

= dm

IIIIIIII

scIIU

XQRPXQRPU

Tr ng

hp 2: t on dy II-8

00

2

2

87878787777787

74,15100110

22.16,1123.1853,23.14,299,11.47

100....

%

=+++

=

+++

= dm

IIIIIIIIscII

U

XQRPXQRPU

Bng tng kt tn tht in p ca phng n IVon S(MVA) R( ) X( ) Ubt% Usc%

I-1 47+j

29,14

4,7 9,3 4,07 1

1,191-2 18

+j11,1614,55 13,92 3,45

I-3 38+j23,56

7,27 11,39 4,5 9

I-4 47+j23,056

6,64 13,16 5,14 12,97

4-5 18 +j5,526

14 13,38 2,69

I-6 11,12+j9,33

20,7 19,8 3,44 9,49

II-6 26,8+j14,23

14,85 19,31 5,56 11,12

II-8 20,16+j12

,5

18,9 29,61 6,2

23,258-7 2,16+j1,3 23 22 0,65



41/149


4

II-7 26,84+j16,64

11,9 23,53 5,88

II-9 29+j17,98 10,57 13,73 4,57 9,14

Nh vy tn tht in p ln nht trong ch bnhthng l tn tht in p t NI n ph ti 5, tn thtin p ln nht trong ch s c l tn tht in ptrn mch vng II-7-8-II khi t on dy II-7.

Ubtmax% = 7,83 %

Uscmax% = 23,25 %

5. Phng n V:5.1: S ni dy.


NI NII

4

3

58

7

6

1

29


42/149



Bng tng kt dng cng sut chy trn cc nhnh PAV


I-1 47 29,14 47+j29,14

1-2 18 11,16 18 +j11,16

I-3 56 29,086 56+j29,086

3-5 18 5,526 18 +j 5,526

I-4 29 17,98 29 +j17,98

I-6 11,2 9,33 11,12+j9,33

II-6 26,8 14,23 26,8+j14,23

II-7 47 29,14 47+j 29,14

7-8 18 11,16 18 +j11,16

II-9 29 17,98 29 +j17,98



43/149


Bng tng kt chn dy dn cho phng n V


)Fkt(mm2

)ISC(A) ICP(A)

I-1 47+j29,14 145,1 145,1 150 290,2

445

1-2 18+j11,16

55,57 55,57 70 111,16

265

I-3 56+j29,086

165,6 165,6 185 331,2

510

3-5 18 +j

5,526

89,54 89,54 95 179,

08

330

I-4 29+j17,98

49,41 49,41 70 98,82

265

I-6 11,12+j9,33

38,25 38,25 70 67,5 265

II-6 26,8+j14,23

79,63 79,63 95 159,26

330

II-7 47+j29,14 145,1 145,1 150 290,2

445

7-8 18+j11,16

55,57 55,57 70 111,16

265

II-9 29+j17,98

89,54 89,54 95 179,08

330


Bng thng s ca cc l ng dy PAV

on l(km)

Ftc(mm2

)

r0( /km)

x0( /km)

b0.10-6

(S/km)

R()

X()

B/2.10-6 (S)

I - 1 44,72 150 0,21 0,416 2,74 4,7 9,3 122,5



44/149


1 -2

63,25

70 0,46 0,44 2,58 14,55

13,92

163,2

I - 3 53,85

185 0,17 0,409 2,84 4,58 11,01

152,9

3 -5

58,31

70 0,46 0,44 2,58 13,41

12,83

150,4

I - 4 63,25

95 0,33 0,429 2,65 10,44

13,57

167,6

I - 6 90 70 0,46 0,44 2,58 20,7 19,8 232,2

II - 6 90 95 0,33 0,429 2,65 14,85

19,31

238,5

II -7 56,57

150 0,21 0,416 2,74 5,94 11,77

155

7 -8

50 70 0,46 0,44 2,58 11,5 11 129

II - 9 64,03

95 0,33 0,429 2,65 10,57

13,73

169,7

Bng tng kt tn tht in p ca phng n V


I-1 47+j29,14

4,7 9,3 4,07 11,59

1-2 18

+j11,16

14,55 13,92 3,45

I-3 56+j29,086

4,58 11,01 4,77 12,12

3-5 18 +j5,526

13,41 12,83 2,58

I-4 29+j17,98

10,44 13,57 4,52 9,02

I-6 11,12+j9,33 20,7 19,8 3,44 9,49



45/149


II-6 26,8+j14,23

14,85 19,31 5,56 11,12

II-7 47+j29,14

5,94 11,77 5,14 13,01

7-8 18+j11,16

11,5 11 2,73

II-9 29+j17,98

10,57 13,73 4,57 9,14

Nh vy tn tht in p ln nht trong ch bnh

thng l tn tht in p t NII n ph ti 8 , tn thtin p ln nht trong ch s c l tn tht in p tNII n ph ti 8 khi t mt mch trn on II -7.

Ubtmax% = 7,87 %

Uscmax% = 13,01 %



46/149


IV.Tng kt cc phng n v ch tiu k thut.

Qua tnh cc ton trn ta c bng tng kt sau:

Phng n Ubtmax% Uscmax%1 5,56 11,12

2 7,52 12,12

3 7,83 12,97

4 7,83 23,25

5 7,87 13,01

T bng tng kt ch tiu k thut ca cc phng nta thy tt c cc phng n u t ch tiu k thut lcbnh thng cng nh lc s c. V th ta ly cc phng nny xt tip ch tiu kinh t v rt ra phng n ti unht.



47/149


Ch ng 4 : so snh kinh t cc phng n

chn phng n ti u

Trong tnh ton v mt kinh t gia cc phng n ta c

cc gi thit sau:1- S lng my bin p bng nhau2- S lng my ct bng nhau3- S lng dao cch ly bng nhau

Ta so snh v mt kinh t gia cc phng n nh hmchi ph hng nm Z, phng n no c Z nh nht l phngn ti u nht.

Hm chi ph Z c tnh theo cng thc:( ) CAKaaZ dtcvh .. ++=

Trong :+ avh: H s vn hnh vi avh = 0,07+ atc: H s thu hi vn u t ph vi atc = 0,125+ C: Gi 1kW in nng C = 600/kWh = 6.105

(/MWh)+ K: Vn u t cho ng dy

K = ko.L.a

Trong :ko: Gi thnh tng hp ca 1km ng dyL: Chiu di ca ng dya = 1 i vi ng dy 1 mcha = 1,6 i vi ng dy 2 mch

+ A: Tn tht in nng hng nm.

= iPA .

: thi gian tn tht cng sut ln nht

= ( 0,124 + TMax10-4)2.8760

= ( 0,124 + 5500.10-4)2.8760 = 3979 (h)

iP : tng tn tht cng sut ch cc i

i

ii

i RU

QPP

dm

.2

22 +=

Vy ta c cng thc tnh Z:

( ) +=++= idid PKPKZ .10.6.3979.195,0.10.6.3979.125,007,0 33

Ta c bng gi xy dng 1km ng dy trn khng

in p 110kV1 mch, ct thp :



48/149


Loi dy AC-70 AC-95 AC-120 AC-150 AC-185 AC-240

K0.106/km

380 385 392 403 416 436

1.Phng n I :*on I - 1 dy AC-95

KI1 = 385. 44,72 .1,6.106 =27,548.109 ()

)(71,038,7110

98,17292

22

1MWPI =

+=

*on I - 2 dy AC-70

KI2 = 380.100.1,6.106 = 60,8.109 ()

)(853,023110

16,11182

22

2 MWPI =+

=

*on I - 3 dy AC-120

KI3 = 392.53,85.1,6.106 = 33,775.109 ()

)(201,127,7110

56,23382

22

3 MWPI =+

=

*on I - 4 dy AC-95

KI4 = 385.63,25.1,6.106 =38,962.109 ()

)(005,144,10110

98,17292

22

4 MWPI =+

=

*on I - 5 dy AC-70

KI5 = 380.106,3.1,6.106 = 64,63.109 ()

)(716,045,24110

526,5182

22

5 MWPI =+

=

*on I - 6 dy AC-70KI6 = 380.90.1,6.106 = 54,72.109 ()

)(364,07,20110

33,92,112

22

6 MWPI =+

=

*on II - 6 dy AC-95

KII6 = 385.90.1,6.106 =55,44.109 ()

)(13,185,14

110

23,148,262

22

6 MWPII =+

=

*on II - 7 dy AC-95



49/149


KII7 = 385.56,57.1,6.106 =34,847.109 ()

)(898,033,9110

98,17292

22

7MWP

II =+

=

*on II - 8 dy AC-70

KII8 = 380.70.1,6.106 = 42,56.109 ()

)(596,01,16110

16,11182

22

8 MWPII =+

=

*on II - 9 dy AC-95

KII9 = 385.64,03.1,6.106 =39,442.109 ()

)(017,157,10110

98,17292

22

9 MWPII =

+

=

T kt qu trn ta lp c bng sau:

on S

(MVA)

R

( )

P

(MW)

Ftc

(mm2)

L

(km)

Koi.106

Ki.109

I-1 29

+j17,98

7,38 0,71 95 44,7

2

385 27,54

8I-2 18

+j11,1623 0,853 70 100 380 60,8

I-3 38+j23,56

7,27 1,201 120 53,85

392 33,775

I-4 29+j17,98

10,44

1,005 95 63,25

385 38,962

I-5 18+j5,526

24,45

0,716 70 106,3

380 64,63

I-6 11,12+j9,33

20,7 0,364 70 90 380 54,72

II-6 26,8+j14,23

14,85

1,13 95 90 385 55,44

II-7 29+j17,98

9,33 0,898 95 56,5 385 34,847



50/149


7

II-8 18+j11,16

16,1 0,596 70 70 380 42,56

II-9 29+j17,98

10,57

1,017 95 64,03

385 39,442

Vn u t ca phng n 1: K=Ki=452,724.109

Tn tht cng sut ca phng n 1: P =8,49 MW

Tn tht in nng ca phng n 1: A = P. =8,49.103.3979

= 33781,71 kWh

Chi ph tnh ton hng nm ca phng n 1 :

Z = 0,195. 452,724.109+ 8,49.103.3979.600 = 108,5502.109 ()

2.Phng n II

Tnh tng t phng n I ta c bng kt qu sau:

on S

(MVA)

R

( )

P

(MW)

Ftc

(mm2)

L

(km)

Koi.106

Ki.109

I - 1 47+j29,14

4,7 1,188 150 44,72

403 28,835

1 -2

18+j11,16

14,55

0,539 70 63,25

380 38,456

I - 3 56+j29,086

4,58 1,507 185 53,85

416 35,842

3 -5

18 +j5,526

13,41

0,393 70 58,31

380 35,452

I - 4 29+j17,98

10,44

1,005 95 63,25

385 38,962

I - 6 11,12+j9,33

20,7 0,364 70 90 380 54,72

II - 6 26,8+j14,

23

14,8

5

1,13 95 90 385 55,44



51/149


II -7 29+j17,98

9,33 0,898 95 56,57

385 34,847

II - 8 18+j11,16

16,1 0,596 70 70 380 42,56

II - 9 29+j17,98

10,57

1,017 95 64,03

385 39,442

Vn u t ca phng n 2: K=Ki=404,556.109



=34366,623.103 kWh


Z = 0,195.404,556.109+ 8,637.103.3979.600 =99,508393.109 (

3.Phng n III:


on S

(MVA)

R

( )

P

(MW)

Ftc

(mm2

)

L

(km)

Koi.106

Ki.109

I-1 47+j29,14

4,7 1,188 150 44,72

403 28,835

1-2 18+j11,16

14,55

0,539 70 63,25

380 38,456

I-3 38+j23,56

7,27 1,201 120 53,85

392 33,775

I-4 47+j23,056

6,64 1,515 150 63,25

403 40,784

4-5 18 +j5,526

14 0,41 70 60,83

380 36,985

I - 6 11,12+j9,33 20,7 0,364 70 90 380 54,72



52/149


II - 6 26,8+j14,23

14,85

1,13 95 90 385 55,44

II-7 29+j17,98

9,33 0,898 95 56,57

385 34,847

II-8 18+j11,16

16,1 0,596 70 70 380 42,56

II-9 29+j17,98

10,57

1,017 95 64,03

385 39,442

Vn u t ca phng n 3: K=Ki=405,844.109



=35245,982.103 kWh


Z = 0,195.405,844.109+8,858.103.3979.600 =100,28716.109 (

4.Phng n IV:Tnh tng t phng n I ta c bng kt qu sau:

on S

(MVA)

R

( )

P

(MW)

Ftc

(mm2

)

L

(km)

Koi.106

Ki.109

I-1 47+J 29,14 4,7 1,188 150 44,7

2

403 28,83

51-2 18 +j11,16 14,5 0,539 70 63,2 380 38,45



53/149


5 5 6

I-3 38+j 23,56 7,27 1,201 120 53,85

392 33,775

I-4 47+j23,056 6,64 1,515 150 63,25 403 40,784

4-5 18 +j5,526

14 0,41 70 60,83

380 36,985

I - 6 11,12+j9,33

20,7 0,364 70 90 380 54,72

II - 6 26,8+j14,23

14,85

1,13 95 90 385 55,44

II-8 20,16+j12,5

18,9 0,879 120 70 392 27,44

8-7 2,16+j1,34 23 0,012 70 50 380 19

II-7 26,84+j16,64

11,9 0981 150 56,57

403 22,798

II-9 29 +j17,98 10,5

7

1,017 95 64,0

3

385 39,44

2Vn u t ca phng n 4: K=Ki=397,675.109



=36750,044.103 kWh

Chi ph tnh ton hng nm ca phng n 4:Z = 0,195.397,675.109+9,236.103.3979.600 =99,599951.109 (



54/149


5.Phng n V:


on S

(MVA)

R

( )

P

(MW)

Ftc

(mm2

)

L

(km)

Koi.106

Ki.109

I-1 47+j29,14

4,7 1,188 150 44,72

403 28,835

1-2 18+j11,16

14,55

0,539 70 63,25

380 38,456

I-3 56+j29,0

86

4,58 1,507 185 53,8

5

416 35,84

23-5 18 +j

5,52613,4

10,393 70 58,3

1380 35,45

2

I-4 29+j17,98

10,44

1,005 95 63,25

385 38,962

I - 6 11,12+j9,33

20,7 0,364 70 90 380 54,72

II - 6 26,8+j14,23

14,85

1,13 95 90 385 55,44

II-7 47+j29,14

5,94 1,501 150 56,57

403 36,476

7-8 18+j11,16

11,5 0,426 70 50 380 30,4

II-9 29

+j17,98

10,5

7

1,017 95 64,0

3

385 39,44

2

Vn u t ca phng n 5: K=Ki=394,025.109


Tn tht in nng ca phng n 5: A = P. =9,07.103.3979 k

=36089,53.103 kWh

Chi ph tnh ton hng nm ca phng n 5:



55/149


Z = 0,195.394,025.109+ 9,07.103.3979.600 =98,488593.109 ()

6.Bng tng kt cc phng n.

Thng S Phng nI II III IV V

%max btU 5,56 7,52 7,83 7,83 7,87

%max scU 11,12 12,12 12,97 23,25 13,01

)(MWhA 33781,71

34366,623

35245,982

36750,044

36089,53

Z.109 () 108,5502

99,508393

100,28726

99,596651

98,488593

T bng tng kt ta thy phng n II v phng n Vc chi ph tnh ton hng nm nh nht v chnh lchnhau khng qu 5% nn hai phng n tng ng nhau vmt kinh t.

Mt khc phng n II c tn tht in nng nh hn,s n gin hn thun li cho thi cng xy dng. Vy

ta chn phng n II l phng n chnh thc thit ktrong n.


NI NII

4

3

58

7

6

1

29


56/149




57/149


Ch ng 5: chn my bin p v s ni in chnh

I. Chn my bin p ca cc trm ph ti:

Tt c cc ph ti trong h thng in u l h loi I,v vy m bo cung cp in cho cc ph ti nycn t hai my bin p trong mi trm.Nu trm c n MBA th cng sut ca 1 my phi tho mniu kin:

( )1max

nK

SS

Trong :

Smax: cng sut cc i ca ph tiK: h s qu ti, K = 1,4

n: s MBA, n = 21. Ph ti 1:

)(37,244,1

98,1729

)12(4,1

22

max11 MVA

SS =

+=

Vy ta chn MBA c Sm = 25 (MVA)

2. Ph ti 2:

)(13,154,1

16,1118

)12(4,1

22max2

2 MVA

S

S=

+=


3. Ph ti 3:

)(94,314,1

56,2338

)12(4,1

22

max33 MVA

SS =

+=


4. Ph ti 4:)(37,24

4,1

98,1729

)12(4,1

22

max11 MVA

SS =

+=


5. Ph ti 5:

)(13,154,1

16,1118

)12(4,1

22max2

2 MVAS

S =+

=




58/149


6. Ph ti 6:

)(94,314,1

56,2338

)12(4,1

22

max33 MVA

SS =

+=


7. Ph ti 7:

)(37,244,1

98,1729

)12(4,1

22max1

1 MVAS

S =+

=


8. Ph ti 8:

)(13,154,1

16,1118

)12(4,1

22max2

2 MVAS

S =+

=


9. Ph ti 9:

)(37,244,1

98,1729

)12(4,1

22

max11 MVA

SS =

+=


T cc s liu tnh ton trn, tra bng s liuMBA ta chn cc MBA nh sau:

- i vi MBA c Sm =16 MVA ta chn loi TPDH-16000/110



Bng thng s cc MBA ca cc trm ph ti

SmMVA

Phti

S l-ng

S liu k thutS liu tnh

ton

Uc

kV

Uh

kV

Un

%

PnkW

P0

kW

I0%

Rb

Xb

Q0kVA

r



59/149


16 2,5,8 6 115

10,5

10,5

85 21 0,85

4,38

86,7

136

25 1,4,7,9

8 115

10,5

10,5

120 29 0,8 2,54

55,9

200

32 3,6 4 115

10,5

10,5

145 35 0,75

1,87

43,5

240

II. Chn my bin p cho cc trm tng p ca nh myin:Do nh my in pht tt c cng sut vo mng in

p 110kV ( tr cng sut t dng) nn ta s dng my binp 3 pha 2 cun dy ni b vi my pht in. Trong trnghp ny cng sut ca mi my bin p c xc nh nhsau:

SmB SmFTrong SmF l cng sut ca mi my pht in

SmF = 85,050

= 58,82 MVA

Do cc my pht in ca c hai nh my l ging nhaunn ta ch cn chn mt loi my bin p chung cho ccmy pht in ca c hai nh my. Ta chn my bin p

TDH-63000/110 c cc thng s nh sau:

Bng thng s MBA ca cc trm tng p trong nhmy in

SmMVA

S liu k thutS liu tnh

ton

UckV

UhkV

Un%

Pn

kW

P0kW

I0%

Rb

Xb

Q0kVA

r

63 115 10,5 10,5 260 59 0,65 0,87 22 410

III.S ni dy ton h thng.S ni in phi m bo cc yu cu :+ Cung cp in an ton lin tc.+ Linh hot trong vn hnh sa cha.+ S n gin d thao tc.

+ Gi thnh thp.1. Trm ngun.



60/149


Trm ngun l trm BA tng p t Umf ln Um ca ngdy truyn ti. y l trm BA quan trng nht ca hthng.

Cc nh my ch c hai cp in p do ta chn cchni b my pht my bin p ln thng h thng haithanh gp.Nu phi ra sa cha nh k hay s c btk mt my pht ,my bin p, thanh gp no ..th ph tivn c cung cp in mt cch lin tc

Trm ngun dng s h thng 2 thanh gp lin h vinhau bng my ct lin lc.2.Trm trung gian:

C hai trm trung gian l cc trm 1 v 3 yu cu philin tc truyn

ti in nn ta chn s hai thanh gp.

3.Trm cui.

Gm cc trm 2, 4, 5, 6, 7, 8, 9 cung cp in cho cch 2, 4, 5, 6, 7, 8, 9

Do ph ti cc tiu bng 50% ph ti cc i, ch vn hnh kinh t cc trm phi thng xuyn ng ct khiph ti thay i t ch min sang ch max. Mtkhc a s cc on ng dy u ngn (


61/149


vn lm vic bnh thng. Ngc li khi s c hay sa chamt ng dy th tm thi ngng lm vic. S cungoi thch hp cho cc trm bin p cn phi ng ctmy bin p thng xuyn v ng dy ngn hn 70km.

T nhng tnh ton trn ta c s ni dy ton hthng. (Bn v A3 trang bn, km bn v A1).

Ch ng 6 :tnh ton cn bng chnh xc cng sut

Tnh ton cc ch vn hnh.

Ch xc lp ca mng in mun tn ti th trcht phi tn ti s cn bng cng sut trong mng. Nu githit mng in thit k m bo cung cp cng suttc dng cho cc ph ti th phi tnh ton cn bngcng sut phn khng, nu cc ngun khng cung cp cng sut phn khng th cn phi tin hnh b cng sutphn khng, gi l b cng bc hay b k thut.

Vic thc hin cn bng chnh xc cng sut trongmng in c thc hin trong ch ph ti cc i. cn bng chnh xc cng sut trong mng cn phi tnhton tng cng sut yu cu trong mng bao gm cngsut yu cu ca cc ph ti, cng sut t dng ca nhmy, tn tht cng sut trn ng dy, tn tht cngsut trong cc my bin p. V cha bit in p ti cc ntnn trong qu trnh tmh ton ta s dng in p nhmc ca mng .

Cc cng thc s dng trong qu trnh tnh ton:+ Tn tht cng sut trong trm bin p :



62/149


)(2

22

BiBi

dm

iidi jXR

U

QPS +

+= (MVA)

+ Tn tht cng sut trn ng dy :

)(2

22

dd

dm

di jXR

U

QPS +

+= (MVA)

Trong :Pi ,Qi:Cng sut tc dng v phn khng ca ph

tiRBi ,XBi:in tr v in khng tng ng ca

ph ti th iRd ,Xd: in tr v in khng tng ng ca

ng dyUdm:in p nh mc ca mng in

+ Cng sut phn khng do dung dn ca ng dysinh ra:2

.2

1dmC UBQ = (MVAr)

B: in dn phn khng ca ng dy+ Tn tht cng sut trong trm bin p tng p:

++

+=

dmB

ptn

dmB

ptn

BSn

SUQnj

Sn

SPPnS

..100

.%...

.

..

2

0

2

0 (MVA)

i.tnh Cn bng chnh xc cng sut ch max:1.on NI ph ti 1 ph ti 2 :


=29 + 17,98 M

44,72 km

AC-150

36,05 km

2AC-70

TPDH-

Qcc1

I

Qcd1

Zi1

i1I1I1

S1S01

ZB1

1212

Z12Q

cd2Q

cc2

1

TPDH-16000/

S =18 +1116+1798 MVA


63/149


+ Thng s ca ng dy:

ZI1=4,7 +j 9,3 BI1/2 =163,2.10-6 SZ12=14,55 +j 13,92 B12/2 =122,5.10-6 S

+ Thng s ca trm bin p:

S01=2( P01+j Q01) = 0,058+j 0,4 MVA S02=2( P02+j Q02) = 0,042+j 0,272 MVA

ZB1=2

1(RB1+jXB1) = 1,27+j 29,95

ZB2=2

1(RB2+jXB2) = 2,19+j 43,35

+ Tn tht cng sut trong cun dy ca trm bin p:

MVAjjZU

QPS B

dm

B 689,2122,0)95,2727,1(110

98,17292

22

12

2

1

2

11 +=+

+=

+=

MVAjjZU

QPS B

dm

B 607,1081,0)35,4319,2(110

16,11182

22

22

2

2

2

22 +=+

+=

+=

Cng sut ti thanh ci cao p ca ph ti 2:S2= S2+ S02 + SB2 =18+j11,16 + 0,042 +j 0,272 +

0,081+j1,607=18,123+j13,039 MVA

Cng sut phn khng do dung dn ca ng dy 1- 2 vi t sinh

Qcc12=Qcd12=1/2.U2dm.B12=1102.163,2.10-6=1,975 MVAr

Cng sut sau tng tr ca ng dy 1-2:

S

12= S2- j Qcc12=18,123+j13,039-j1,975=18,123+j11,064 MVA

Tn tht cng sut trn on ng dy 1-2:

519,0542,0)92,1355,14(110

064,11123,182

22

12 jjS +=++

= MVA

Cng sut trc tng tr ca ng dy 1-2:

S12= S12+ S12=18,123+j11,064 + 0,542+j 0,519=18,665+j11,583 MVA



64/149


Cng sut pht ln ng dy 1-2:

S12= S12- j Qcd12=18,665+j11,583-j1,975 =18,665+j9,608 MVA

Cng sut ti thanh ci cao p ca ph ti 1:

S1= S1 + S01 + SB1=29+j17,98 + 0,058 +j 0,4 +0,122+j2,689

=29,18+j21,069 MVA

Cng sut phn khng do dung dn ca ng dy I - 1 vi t sinh

QccI1=QcdI1=1/2.U2dm.BI1=1102.122,5.10-6=1,482 MVAr

Cng sut sau tng tr ca ng dy I - 1:SI1= S1+S12 -j QccI1=29,18+j21,069 +18,665+j 9,608-j1,482=47,845

+j29,195 MVA

Tn tht cng sut trn on ng dy I -1:

414,222,1)3,97,4(110

195,29845,472

22

1 jjSI +=++

= MVA

Cng sut trc tng tr ca ng dy I - 1:

SI1= SI1+ SI1=47,845 +j29,195 + 1,22+j 2,414=49,065+j31,609 MVA

Cng sut pht ln ng dy I - 1:

SI1= SI1- j QcdI1= 49,065+j31,609 -j1,482 = 49,065+j30,127 MVA



65/149


2.on NI ph ti 3 ph ti 5 :

+ Thng s ca ng dy:

ZI3= 4,58 +j 11,01 BI3/2 =152,9.10-6 SZ35=13,41 +j 12,83 B35/2 =150,4.10-6 S

+ Thng s ca trm bin p: S03=2( P03+j Q03) = 0,07+j 0,48 MVA S05=2( P05+j Q05) = 0,042+j 0,272 MVA

ZB3=2

1(RB3+jXB3) = 0,935+j 21,75

ZB5=2

1(RB5+jXB5) = 2,19+j 43,35


MVAjjZU

QPS Bdm

B 593,3154,0)75,21935,0(110

56,23382

22

32

2

3

2

33 +=+

+=+=

MVAjjZU

QPS

B

dm

B607,1081,0)35,4319,2(

110

16,11182

22

52

2

5

2

5

5+=+

+=

+=


S5= S5 + S05+ SB5 =18+j11,16 + 0,042 +j 0,272 +0,081+j1,607

=18,123+j13,039 MVA


=38 + 23,56 M

53,85 km

AC-185

58,31 km

2AC-70

TPDH-

Qcc3

Qcd3

Zi3

i3I3I3

S3S03

ZB3

3535

Z35Q

cd5Q

cc5

TPDH-16000/

S = 18 +1116 M8 +2356 MVA


66/149



Qcc35=Qcd35=1/2.U2dm.B35 =1102.150,4.10-6=1,82 MVAr

Cng sut sau tng tr ca ng dy 3- 5:

S35= S5- j Qcc35=18,123+j13,039-j1,82=18,123+j11,219 MVA

Tn tht cng sut trn on ng dy 3- 5:

482,0503,0)83,1241,13(110

219,11123,182

22

35 jjS +=++

= MVA

Cng sut trc tng tr ca ng dy 3- 5:

S35= S35+ S35=18,123+j11,219 + 0,503+j 0,482=18,626+j11,701 MVA

Cng sut pht ln ng dy 3- 5:S35= S35- j Qcd35=18,626+j11,701 -j1,82 =18,626+j

9,881 MVA


S3= S3 + S03 + SB3=38+j23,56 + 0,07+j 0,48+0,154+j3,593

=38,224+j27,633 MVACng sut phn khng do dung dn ca ng dy I - 3 vi t sinh

QccI3=QcdI3=1/2.U2dm.BI3=1102.152,9.10-6=1,85 MVAr

Cng sut sau tng tr ca ng dy I - 3:

SI3= S3+S35 -j QccI3=38,224+j27,633+18,626+j 9,881 -j1,85 =56,85

+j35,664 MVA

Tn tht cng sut trn on ng dy I - 3:

098,4705,1)01,1158,4(110

664,3585,562

22

3 jjSI +=++

= MVA


SI3= SI3+ SI3=56,85 +j35,664 + 1,705+j 4,098=58,555+j39,762 MVA


SI3= SI3- j QcdI3= 58,555 +j39,762 -j1,85 =58,555+j37,912 MVA



67/149


3.on NI ph ti 4 :

+ Thng s ca ng dy:

ZI4=10,44 +j 13,57 BI4/2 =167,6.10-6 S


S04=2( P04+j Q04) = 0,058+j 0,4 MVA

ZB4=2

1(RB4+jXB4) = 1,27+j 29,95


MVAjjZU

QPS B

dm

B 689,2122,0)95,2727,1(110

98,17292

22

42

2

4

2

44 +=+

+=

+=


S4= S4 + S04 + SB4=29+j17,98 + 0,058 +j 0,4 +0,122+j2,689

= 29,18+j 21,069 MVA

Cng sut phn khng do dung dn ca ng dy I - 4 vi t sinhQccI4=QcdI4=1/2.U2dm.BI4=1102.167,6.10-6=2,028 MVAr


S04cc4Q

N i

Qcd4

I4Z B4Z

S4SS

TPDH-25000/1102AC-95

N i

S I4I4 I4

S4 =29 +j17,98 MVA

S4 =29 +j17,98 MVA

63,25Km


68/149



SI4= S4 -j QccI4=29,18+j21,069 j 2,028=29,18+j 19,041 MVA


362,1047,1)57,1344,10(110

041,1918,292

22

4 jjSI +=++

= MVA


SI4= SI4+ SI4=29,18+j 19,041 + 1,047+j 1,362=30,227+j20,403 MVA


SI4= SI4- j QcdI4= 30,227+j 20,403 -j2,028 =

30,227+j18,375 MVA

4.on NII ph ti 7 :

+ Thng s ca ng dy:

ZII7=9,33 +j 12,13 BII7/2 =149,9.10-6 S


S07=2( P07+j Q07) = 0,058+j 0,4 MVA

ZB7=2

1(RB7+jXB7) = 1,27+j 29,95


MVAjjZU

QPS B

dm

B 689,2122,0)95,2727,1(110

98,17292

22

72

2

7

2

77 +=+

+=

+=


S07cc7Q

N iI

Qcd7

II7Z B7Z

S7SS

TPDH-25000/1102AC-95

N iI

S II7II7 II7

S7 =29 +j17,98 MVA

S7 =29 +j17,98 MVA

56,57Km


69/149



S7= S7 + S07 + SB7=29+j17,98 + 0,058 +j 0,4 +0,122+j2,689

= 29,18+j 21,069 MVA

Cng sut phn khng do dung dn ca ng dy II - 7 vi t sinhQccII7=QcdII7=1/2.U2dm.BII7=1102.149,9.10-6=1,814 MVAr

Cng sut sau tng tr ca ng dy II - 7:

SII7= S7 -j QccII7=29,18+j21,069 j 1,814=29,18+j 19,255 MVA

Tn tht cng sut trn on ng dy II - 7:

225,1942,0)13,1233,9(110

255,1918,29

2

22

7 jjSII +=++

= MVA

Cng sut trc tng tr ca ng dy II - 7:

SII7= SII7+ SII7=29,18+ j 19,255 + 0,942+j 1,225=30,122+j20,48 MVA

Cng sut pht ln ng dy II - 7:

SII7= SII7- j QcdII7= 30,122+j 20,48 j1,814 =30,122+j18,666 MVA5.on NII ph ti 8 :

+ Thng s ca ng dy:

ZII8= 16,1 +j 15,4 BII8/2 =180,6.10-6 S


S08=2( P08+j Q08) = 0,042+j 0,272 MVA

ZB8=2

1(RB8+jXB8) = 2,19+j 43,35


S08cc8Q

N iI

Qcd8

II8Z B8Z

S8SS

TPDH-16000/1102AC-70

N iI

S II8II8 II8

S8 =18 +j11,16 MVA

S8 =18 +j11,16 MVA

70Km


70/149



MVAjjZU

QPS

B

dm

B607,1081,0)35,4319,2(

110

16,11182

22

82

2

8

2

8

8 +=++

=+

=


S8= S8 + S08+ SB8 =18+j11,16 + 0,042 +j 0,272 +0,081+j1,607

=18,123+j13,039 MVA

Cng sut phn khng do dung dn ca ng dy II - 8 vi t sinh

QccII8=QcdII8=1/2.U2dm.BII8 =1102.180,6.10-6=2,185 MVAr


SII8= SII8- j QccII8=18,123+j13,039-j2,185

=18,123+j10,854 MVATn tht cng sut trn on ng dy II - 8:

568,0594,0)4,151,16(110

854,10123,182

22

8 jjSII +=++

= MVA


SII8= SII8+ SII8=18,123+j10,854+ 0,594+j 0,568=18,717+j11,422 MVA

Cng sut pht ln ng dy II - 8:SII8= SII8- j QcdII8 =18,717+j11,422 - j2,185 =18,717+j

9,237 MVA

6.on NII ph ti 9 :


S09cc9Q

N iI

Qcd9

II9Z B9Z

S9SS

TPDH-25000/1102AC-95

N iI

S II9II9 II9

S9 =29 +j17,98 MVA

S9 =29 +j17,98 MVA

64,03Km


71/149


+ Thng s ca ng dy:

ZII9=10,57 +j 13,73 BII9/2 =169,7.10-6 S


S09=2( P09+j Q09) = 0,058+j 0,4 MVAZB9=

2

1(RB9+jXB9) = 1,27+j 29,95


MVAjjZU

QPS B

dm

B 689,2122,0)95,2727,1(110

98,17292

22

92

2

9

2

99 +=+

+=

+=


S9= S9 + S09 + SB9 =29+j17,98 + 0,058 +j 0,4 +

0,122+j2,689= 29,18+j 21,069 MVA


QccII9=QcdII9=1/2.U2dm.BII9=1102.169,7.10-6=2,053 MVAr


SII9= S9 -j QccII9=29,18+j21,069 j 2,053=29,18+j19,016 MVA

Tn tht cng sut trn on ng dy II - 9:376,106,1)73,1357,10(

110

016,1918,292

22

9 jjSII +=++

= MVA


SII9= SII9+ SII9=29,18 +j 19,016 +1,06 +j 1,376=30,24+j20,392 MVA

Cng sut pht ln ng dy II - 9:

SII9= S

II9- j QcdII9= 30,24+j 20,392 j 2,053 =30,24+j18,339 MVA

7.ng dy lin lc gia hai nh my NI ph ti 6 NII :


S6 = 38 + j23,56 MVA

N I N II90 km

2AC-70

90 km

2AC-95

TPDH-32000/110

Q

N I

QcdI6

I6Z

S'"I6S"S'I6S I6I6

ccI6

S6

S06

B6Z

II6II6 SII6S"S'"

ZII6

ccII6Q QcdII6

N II

II6S'

S6 = 38 + j23,56 MVA


72/149


+ Thng s ca ng dy:ZI6= 20,7 +j 19,8 BI6/2 =232,2.10-6 SZII6=14,85 +j 19,31 BII6/2 =238,5.10-6 S


S06=2( P06+j Q06) = 0,07+j 0,48 MVA

ZB6 =2

1(RB6+j XB6) = 0,935+j 21,75


MVAjjZU

QPS B

dm

B 593,3154,0)75,21935,0(110

56,23382

22

62

2

6

2

66 +=+

+=

+=


S6= S6+ S06 + SB6=38+j23,56 + 0,07+j 0,48+0,154+j3,593

=38,224+j27,633 MVA

Cng sut phn khng do dung dn ca ng dy I - 6 vi t sinh

QccI6=QcdI6=1/2.U2dm.BI6=1102.232,2.10-6 =2,81 MVAr


QccII6=QcdII6=1/2.U2dm.BII6=1102.238,5.10-6 =2,886 MVAr

Ta cho nh my NI pht 85% cng sut nh mc Cos=0,85.Do ta c cng sut pht ln thanh ci cao p canh NI l:



73/149


PI-CA=PI-F - PI-TD- PI-B

QI-CA= QI-F- QI-TD- QI-B

PI-F , QI-F :Cng sut pht ca NI

PI-F =170 MWQI-F=PI-F .tg F =170.0,62=105,4 MVArPI-TD , QI-TD :Cng sut t dng ca NI

PI-TD =8%. PI-F =8%.170 =13,6 MWQI-TD=PI-TD .tg TD =13,6.0,75=10,2 MVArCng sut pht ln h p ca cc MBA tng p ca NI:

PI-HA=PI-F - PI-TD=170-13,6=156,4 MW

QI-A= QI-F- QI-TD=105,4-10,2=95,2 MVAr

SI-HA=156,4+j95,2 MVA

PI-B , QI-B :Tn tht cng sut trong cc MBA tngp ca NI

++

+=+=

dmB

ptn

dmB

ptn

IBIBBSn

SUQnj

Sn

SPPnQjPS

..100

.%..

.

..

2

0

2

0 MVA

+++

++=

63.4.100

)2,954,156.(5,1041,0.4

63.4

)2,954,156.(26,0059,0.4

22

2

22

jSB

= 0,785 + 15,608 MVA

PI-CA=170-13,6- 0,785 = 155,615 MW

QI-CA= 155,615 -10,2 -15,608 = 79,592 MVAr

SI-CA=155,615+j 79,592 MVACng sut NI truyn vo ng dy I-6:

SI-6=SI-CA (SI-12+ SI-35 +SI-4)

=155,615 +j 79,592-(49,065+j30,127+58,555+j37,912+30,227+j18,375)=17,768 j 6,822 MVA


SI6= SI6 +j QcdI6 =17,768-j6,882 +j 2,81=17,768 j4,012 MVA


543,0568,0)8,197,20(110

012,4768,17

2

22

6 jjSI+=+

+=

MVA



74/149



SI6= SI6- SI6 =17,768 j 4,012- 0,568 -j 0,543 =17,2-j4,555 MVA

Cng sut NI pht ln u cao p trm bin p B6 :

SI6= SI6 +j QccI6 =17,2-j4,555 +j 2,81=17,2 j1,745MVA

Cng sut NII pht ln u cao p trm bin p B6 :

SII6= S6-SI6 =38,224+j27,633-(17,2 j1,745)=21,024 + j29,378 MVA


SII6= SII6- j QccII6 =21,024 + j29,378-j 2,886 =21,024 +

j26,492 MVATn tht cng sut trn on ng dy II - 6:

825,1404,1)31,1985,14(110

492,26024,212

22

6 jjSII +=++

= MVA


SII6= SII6 + SII6 =21,024+j26,492+1,404+j1,825=22,428+j28,317 MVACng sut NII truyn vo ng dy I-6:

SII-6=SII6 j QcdII6=22,428+j 28,317-j2,886=22,428+j25,431 MVA

Tng cng sut yu cu trn thanh ci cao p ca NII:

SII-CA =SII-6+ (SII-7+ SII-8 +SII-9)

=22,428+j25,431+(30,122+j18,666+18,117+j9,237+30,24+j18,339)

=100,907+j 71,673 MVATn tht cng sut trong cc MBA tng p ca NII

++

+=+=

dmB

ptn

dmB

ptn

IBIBBSn

SUQnj

Sn

SPPnQjPS

..100

.%..

.

..

2

0

2

0 MVA

+++

++=

63.3.100

)673,71907,100.(5,1041,0.3

63.3

)673,71907,100.(26,0059,0.3

22

2

22

jSB

= 0,511 +9,74 MVA

Cng sut pht ln h p ca cc MBA tng p ca NII:



75/149


SII-HA = SII-CA + SII-B=100,907+j 71,673+ 0,511+j 9,74

=101,418+j 81,413 MVACng sut t dng ca NII:

PII-TD =8%. PII-HA=8%.101,418 =8,113 MW

QII-TD=PII-TD .tg TD =8,113.0,75 =6,085 MVArLng cng sut ca NII cn pht l:SII-F = SII-HA + SII-TD=101,418+j81,413+ 8,113 +j6,085

=109,531+j 87,498 MVA

Lng cng sut phn khng yu cu ca nh my NII l:

QII-YC= 87,298 MVArTrong khi cng sut phn khng pht ca nh my NIIl:

QII-F = PII-F.tg F=109,531.0,62= 67,909 MVArTa thy QII-YC > QII-F vy ta phi tin hnh b cng bc vidung lng b:

Qbcb = QII-YC - QII-F =87,298- 67,909 = 19,389 MVAr

iI.b cng sut phn khng:Qua tnh ton trn ta thy lng cng sut phn khngcn phi b l:

QBcb=19,389 MVArTa tin hnh phn b lng cng sut b ny cho cc h

tiu th trong ton mng in ch cc i. phnb lng cng sut b ny sao cho hiu qu nht, ta s dnghm chi ph tnh ton hng nm vi thit b b

Z = Z1 + Z2 +Z3

Trong :Z1: Chi ph v thit b bZ2: Chi ph v tn tht cng sut tc dng trong

thit b bZ3: Chi ph v tn tht cng sut tc dng trn

cc ng dy sau khi lp thit b b.Do lng cng sut phi b l khng i nn cc chi ph

Z1 v Z2 cng khng i, nn ta ch xt n chi ph Z3. tnh ton ta dng cc cng thc sau:

+ Hm mc tiu: Z = C. . Pmd= C. . 21

dmU Qi2.Ri=K. Qi2.RiMin



76/149


+ Hm rng buc:Qb1+ Qb2+ Qb3+ Qb4+ Qb5+ Qb6 +Qb7+ Qb8+ Qb9 =19,389

MVArTa c:

Z=K.[(Q2- Qb2)2.(R12+Rb2)+(Q1- Qb1)2.Rb1+(Q2+Q1- Qb2-Qb1)2.RI1

+(Q5- Qb5)2.(R35+Rb5)+(Q3- Qb3)2.Rb3+(Q5+Q3- Qb5-Qb5)2.RI3

+(Q4- Qb4)2.(RI4+Rb4) + (Q7- Qb7)2.(RII7+Rb7)+(Q8- Qb8)2.(RII8+Rb8)+ (Q9- Qb9)2.(RII9+Rb9)+ Q2I6.RI6 + Q2II6.RII6 + (Q6- Qb6)2.Rb6

Trong :Qbi: Lng cng sut phn khng d kin b cho ph ti iQI6 = QImax- (Q1- Qb1+ Q2- Qb2+ Q3- Qb3+ Q4- Qb4+ Q5- Qb5)

=79,592- (81,84 - Qb1- Qb2- Qb3- Qb4- Qb5)=-2,248 +(Qb1+ Qb2+ Qb3+ Qb4+ Qb5)

QII6 = Q6 - Qb6 - QI6 =25,56 +2,248 - (Qb1+ Qb2+ Qb3+Qb4+ Qb5+ Qb6)

= 25,808 - (Qb1+ Qb2+ Qb3+ Qb4+ Qb5+ Qb6)

Vy:Z=K.[(11,16 - Qb2)2.16,74 +(17,98- Qb1)2.1,27+(29,14 -

Qb2- Qb1)2.4,7+(11,16- Qb5)2.15,6 +(23,56- Qb3)2.0,935+(34,72-

Qb5- Qb5)2.4,58+(17,98 - Qb4)2.11,71 + (17,98- Qb7)2.10,6+(11,16 - Qb8)2.18,29 + (17,98- Qb9)2.11,84+(-2,248 + Qb1+ Qb2+ Qb3+ Qb4+ Qb5)2.20,7

+(25,808 - Qb1- Qb2- Qb3- Qb4- Qb5- Qb6)2.14,85+ (23,56- Qb6)2.0,935

t L= Qb1+ Qb2+ Qb3+ Qb4+ Qb5+ Qb6 +Qb7+ Qb8+ Qb9-QBcb

Lp hm Lagrange:ZL = Z + .Z2Min

Hm rng buc: L= 0

Ly o hm ring ca ZL theo Qbi v ta c h phng

trnh sau:



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83,04Qb1+ 80,5Qb2+71,1Qb3+71,1Qb4+71,1Qb5+29,7Qb6 + =1179,1(1)

80,5Qb1+113,98Qb2+71,1Qb3+71,1Qb4+71,1Qb5+29,7Qb6+ =1507,11(2)

71,1Qb1+ 71,1Qb2+82,13Qb3+71,1Qb4+80,26Qb5+29,7Qb6+ =1221,6(3)

71,1Qb1+71,1Qb2+71,1Qb3+94,52Qb4+71,1Qb5+29,7Qb6 + =1280,65(4)

71,1Qb1+71,1Qb2+80,26Qb3+71,1Qb4+11,46Qb5+29,7Qb6+ =1525,79(5)

29,7Qb1+29,7Qb2+29,7Qb3+29,7Qb4+29,7Qb5+31,57Qb6 + =810,555(6)

21,6.Qb7 + = 381,176 (7)

36,58.Qb8 + = 408,233 (8)

23,68.Qb9 + = 425,766 (9)

Qb1+ Qb2+ Qb3+ Qb4+ Qb5+ Qb6 +Qb7+ Qb8+ Qb9 +

=19,389 (1Gii h phng trnh trn ta c nghim:

Qb1= - 8,129 Qb2=9,179Qb3= - 4,971 Qb4=3,874Qb5 = 9,45 Qb6 =5,314Qb7 = 0,819 Qb8=1,223Qb9 = 2,63 =19,389

Cho Qb1= Qb3 = Qb7 = 0 loi b cc phng trnh (1) (3) (7)v b cc thnh phn Qb1, Qb3 , Qb7 trong cc phng trnh

cn li ta c h phng trnh sau:



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113,98.Qb2+71,1.Qb4+71,1.Qb5+29,7.Qb6+ =1507,118 (2)

71,1.Qb2+ 94,52.Qb4+71,1.Qb5+29,7.Qb6 + =1280,656 (4)

71,1.Qb2++71,1.Qb4+11,46.Qb5+29,7.Qb6+ =1525,792 (5)

29,7.Qb2+29,7.Qb4+29,7.Qb5+31,57.Qb6 + =810,555 (6)

36,58.Qb8 + = 408,233 (8)

23,68.Qb9 + = 425,766 (9)

Qb2+ Qb4+ Qb5+ Qb6 +Qb7+ Qb8+ Qb9 + =19,389(10)

Gii h phng trnh trn ta c nghim:Qb2= 5,314Qb4= 0,06Qb5 = 6,109Qb6 =3,576Qb8=1,411Qb9 = 2,92 =356,628

Cho Qb4= 0 loi b tip phng trnh (4) v b thnh

phn Qb4 trong cc phng trnh cn li ta c h phngtrnh sau:

113,98.Qb2+71,1.Qb5+29,7.Qb6+ = 1507,118 (2)

71,1.Qb2+11,46.Qb5+29,7.Qb6+ = 1525,792 (5)

29,7.Qb2++29,7.Qb5+31,57.Qb6 + = 810,555 (6)

36,58.Qb8 + = 408,233 (8)

23,68.Qb9 + = 425,766 (9)

Qb2+ Qb5+ Qb6 +Qb7+ Qb8+ Qb9 + =19,389(10)

Gii h phng trnh trn ta c nghim:

Qb2= 5,334Qb5 = 6,129Qb6 =3,595

Qb8=1,411Qb9 = 2,92



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=356,617Nh vy ta c bng s liu sau khi b cng bc nh sau:

Bng s liu sau khi b cng bccng sut phn khng

Phti

1 2 3 4 5 6 7 8 9

PMax 29 18 38 29 18 38 29 18 29

cos 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85

QMaxtb 17,98

11,16

23,56

17,98

11,16

23,56

17,98

11,16

17,98

Qb 0 5,334

0 0 6,129

3,595

0 1,411

2,92

QMaxsb 17,98

5,826

23,56

17,98

5,031

19,965

17,98

9,749

15,06

cos sb

0,85 0,951

0,85 0,85 0,963

0,885

0,85 0,879

0,887



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iii.tnh li ch max sau khi b cng bc:1.on NI ph ti 1 ph ti 2 :

+ Thng s ca ng dy:

ZI1=4,7 +j 9,3 BI1/2 =163,2.10-6 SZ12=14,55 +j 13,92 B12/2 =122,5.10-6 S

+ Thng s ca trm bin p: S01=2( P01+j Q01) = 0,058+j 0,4 MVA S02=2( P02+j Q02) = 0,042+j 0,272 MVA

ZB1=2

1(RB1+jXB1) = 1,27+j 29,95

ZB2=2

1(RB2+jXB2) = 2,19+j 43,35


MVAjjZU

QPS Bdm

B 689,2122,0)95,2727,1(110

98,17292

22

12

2

1

2

11 +=+

+=+=


=29 + 17,98 M

44,72 km

C-150

36,05 km

2AC-70

TPDH-

Qcc1

Qcd1

Zi1

i1I1I1

S1S01

ZB1

1212

Z12Q

cd2Q

cc2

1

TPDH-16000/

S =18 +5826 M9 +1798 MVA


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MVAjjZU

QPS B

dm

B 282,1065,0)35,4319,2(110

826,5182

22

22

2

2

2

22 +=+

+=

+=


S2= S2+ S02 + SB2 =18+j 5,826 + 0,042 +j 0,272 +0,065+j1,2822

= 18,107 +j 7,38 MVA


Qcc12=Qcd12=1/2.U2dm.B12=1102.163,2.10-6=1,975 MVAr

Cng sut sau tng tr ca ng dy 1-2:

S12= S2- j Qcc12=18,107 +j 7,38 -j1,975=18,107+j5,405 MVA

Tn tht cng sut trn on ng dy 1-2:

411,0429,0)92,1355,14(110

405,5107,182

22

12 jjS +=++

= MVA

Cng sut trc tng tr ca ng dy 1-2:

S12= S12+ S12=18,107+j 5,405 + 0,429+j 0,411=18,526+j5,816 MVA

Cng sut pht ln ng dy 1-2:

S12= S12- j Qcd12=18,526+j 5,816 -j1,975 =18,526+j3,841 MVA


S1= S1 + S01 + SB1=29+j17,98 + 0,058 +j

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