do an mang luoi dien le hai nam

7/29/2019 Do an Mang Luoi Dien Le Hai Nam

1/83

nMn Hc Mng Li in

L Hi Nam- Lp htd3k53 Page 1

M U

Ngy nay, in nng l mt phn v cng quan trng trong h thng nng lngca mt quc gia. in nng l mt dng nng lng c nhiu u im nh: ddnh

chuyn thnh cc dng nng lng khc (nhit, c, ha), d truyn ti v phn phi.Chnh v vy in nng c s dng rt rng ri trong mi lnh vc hot ng cacon ngi. Trong iu kin nc ta hin nay ang trong thi k cng nghip ho vhin i ho th in nng li ng mt vai tr v cng quan trng.

in nng l ngun nng lng chnh ca cc ngnh cng nghip, l iu kinquan trng pht trin cc thv dn c.. V l do khi lp k hoch pht trinkinh tx hi, k hoch pht trin in nng phi i trc mt bc, nhm tha mnnhu cu in nng khng nhng trong giai on trc mt m cn d kin cho sphttrin trong tng lai 5,10 nm hoc c khi cn lu hn na. Thm vo n n kinh tnc ta cn trong giai on ang pht trin v vic sn xut in nng cn ang thiuthn so vi nhu cu tiu thin nn vic truyn ti in, cung cp in cng nh

phn phi in cho cc htiu th cn phi c tnh ton k lng va m bohp l vk thut cng nh v kinh t.

Trong qu trnh nghin cu v thit kn mn hc ny a ra phng n ckhnng thc thi nht trong vic thit k mng li in cho mt khu vc gm cc htiu thin loi I v loi III. Nhn chung, phng n c a ra p ng cnhng yu cu c bn ca mt mng li cung cp in nh: tin cy cung cp in,

cht lng in nng, tnh kinh tv an ton

D c gng nhng n skhng trnh khi nhng thiu st v hn ch, em rtmong nhn c s ch bo v gip ca cc thy em c thhon thin c nidung thit kn, hon thin v nng cao kin thc chuyn mn cng nh rn luyn

bn thn vtc phong lm vic, tinh thn v trch nhim.

Em xin chn thnh cm n sgip ca Thy L Minh Khnh gip emhon thnh n mn hc ny.

H Ni, ngy 29 thng 12 nm 2011

Sinh vin thit k

L Hi Nam


2/83

nMn Hc Mng Li in


MC LCMU.1CHNG 15PHN TCH NGUN V PH TI.5CN BNG CNG SUT TRONG H THNG IN.5

1.1 PHN TCH NGUN V PH TI .............................................................................. 51.1.1 Ngun in ........................................................................................................... 51.1.2 Ph ti in ........................................................................................................... 5

1.2 CN BNG CNG SUT TC DNG ........................................................................ 51.3 CN BNG CNG SUT PHN KHNG .................................................................. 61.4 CC S LIU K THUT C BN ............................................................................ 8

1.4.1 Khong cch tnh my ti cc ph ti .............................................................. 81.4.2 Bng thng s ca cc ph ti in ...................................................................... 91.4.3 Cc la chn k thut ban u ............................................................................. 9

CHNG 2..10LP PHNG N V TNH TON K THUT CC PHNG N..10

2.1 T VN ................................................................................................................ 102.2 DKIN CC PHNG N CUNG CP IN V CC TIU CHUN TNHTON K THUT .............................................................................................................. 10

2.2.1 Cc phng n ni dy ....................................................................................... 102.2.2 Tiu chun k thut ca phng n.................................................................... 132.2.3 Phn bcng sut trong mng in .................................................................... 132.2.4 Chn in p nh mc ca mng in .............................................................. 142.2.5

Chn tit din dy dn ........................................................................................ 14

2.2.6 Xc nh cc thng s ca ng dy ................................................................ 152.2.7 Xc nh tn tht in p ln nht ca phng n ............................................. 15

2.3 TNH TON K THUT PHNG N 1.................................................................. 162.3.1 Chn in p nh mc ca mng in .............................................................. 162.3.2 Xc nh tit din dy dn v cc thng s ca ng dy................................ 172.3.3 Xc nh tn tht in p ln nht ca phng n ............................................. 18


2.5 TNH TON K THUT PHNG N 3.................................................................. 222.5.1 chn in p nh mc ca mng in ............................................................... 222.5.2 Xc nh tit din dy dn v cc thng s ca ng dy................................ 222.5.3 Xc nh tn tht in p ln nht ca phng n ............................................. 24


2.7 TNH TON K THUT PHNG N 5.................................................................. 272.7.1 Phn bcng sut trong mng in .................................................................... 282.7.2 Chn in p nh mc ca mng in .............................................................. 292.7.3 Xc nh tit din dy dn v cc thng s ca ng dy................................ 302.7.4 Xc nh tn tht in p ln nht ca phng n ............................................. 31


3/83

nMn Hc Mng Li in


CHNG 3..33SO SNH KINH TCC PHNG N...33

3.1 PHNG PHP SO SNH KINH T ......................................................................... 333.2 TNH TON V KINH TCHO CC PHNG N ................................................ 34

3.2.1

Phng n 1 ........................................................................................................ 34

3.2.2 Phng n 2 ........................................................................................................ 343.2.3 Phng n 3 ........................................................................................................ 353.2.4 Phng n 4 ........................................................................................................ 35

3.3 LA CHN PHNG N HP L NHT ............................................................... 36CHNG 4..37CHN MY BIN P V S NI IN..37

4.1 CHN SLNG V CNG SUT CC MY BIN P TRONG CC TRMHP .................................................................................................................................. 37

4.1.1 Ph ti I.............................................................................................................. 384.1.2 Ph ti II ............................................................................................................. 384.1.3 Ph ti III ............................................................................................................ 384.1.4 Ph ti IV ............................................................................................................ 384.1.5 Ph ti V ............................................................................................................. 384.1.6 Ph ti VI ............................................................................................................ 394.1.7 Thng scc my bin p .................................................................................. 39

4.2 CHN S NI DY TRM HP..................................................................... 394.2.1 Trm ngun ....................................................................................................... 394.2.2 Trm trung gian ................................................................................................. 404.2.3 Trm cui............................................................................................................ 404.2.4 S ni dy chi tit li in .......................................................................... 42

CHNG 5..43TNH TON PHN BCNG SUT TRONG MNG IN TNH TON CHXC

LP CA MNG IN..435.1 TNH TON CHI TIT SPHN BCNG SUT TRONG MNG IN .... 43

5.1.1 Ch ph ti cc i ........................................................................................ 435.1.2 Ch ph ti cc tiu ....................................................................................... 505.1.3 Ch s c ....................................................................................................... 58

5.2 TNH TON IN P TI CC IM NT C MNG IN ..................... 655.2.1 Ch ph ti cc i ....................................................................................... 655.2.2 Ch ph ti cc tiu ...................................................................................... 675.2.3 Ch sau s c ................................................................................................. 68

CHNG 6..71IU CHNH IN P TRONG H THNG IN71

6.1 YU CU IU CHNH IN P THNG...................................................... 716.2 YU CU IU CHNH IN P KHC THNG ......................................... 73

CHNG 7..79CC CH TIU KINH T K THUT C MNG IN.79

7.1 VN U T XY DNG MNG IN ........................................................... 797.2 TN THT CNG SUT TC DNG TRONG MNG IN .......................... 797.3 TN THT IN NNG TRONG MNG IN ................................................. 79


4/83

nMn Hc Mng Li in


7.4 TNH CHI PH GI THNH .................................................................................. 807.4.1 Chi ph vn hnh hng nm ................................................................................ 807.4.2 Chi ph tnh ton hng nm ................................................................................ 817.4.3 Gi thnh truyn ti in nng............................................................................ 817.4.4 Gi thnh xy dng 1 MW cng sut ph ti trong ch cc i ................... 81


5/83

nMn Hc Mng Li in


CHNG 1

PHN TCH NGUN V PH TI

CN BNG CNG SUT TRONG H THNG IN

1.1 PHN TCH NGUN V PH TI

1.1.1Ngun in

Vi gi thit khi thit k mng in l c mt ngun cung cp in nh sau:

Ngun in tnh t thanh gp cao p ca Nh My in, trm trung gian aphng.

Ngun in cung cp cng sut tc dng cho ph ti. H s cng sut trn thanh gp (c gii hn cng sut phn khng)

ndcos 0,85 .

1.1.2Ph tiin

Vi gi thit v ph ti in nh sau:

Cng sut ca ph ti c30MW (khnng ti ca ng dy 110kV). H scng sut ca ph ti l 0,9. tin cy cung cp in l c 5 h loi I v 1 h loi III.

Thi gian s dng cng sut cc i l maxT 5000h .

H sng thi m=1. in p danh nh ca li th cp l 10kV.

1.2 CN BNG CNG SUT TC DNG

Ti mi thi im lun c scn bng gia in nng sn xut ra v in nng tiuth, iu cng c ngha l ti mi thi im cn phi c scn bng gia cng suttc dng v cng sut phn khng ra vi cng sut tc dng v cng sut phn khngtiu th. Nu scn bng trn bph vth cc chtiu cht lng in b gim, dnn gim cht lng ca cc sn phm hoc c th mt n nh hoc lm tan r hthng.

Cng sut tc dng ca cc ph ti lin quan ti tn s ca dng in xoay chiu.Tn s trong h thng sthay i khi scn bng cng sut tc dng trong h thng b

ph v. Gim cng sut tc dng pht ra dn n gim tn sv ngc li. V vy timi thi im trong cc chxc lp ca h thng in, cc nh my in trong hthng cn phi pht cng sut bng tng cng sut ca cc htiu th, k c tn thtcng sut trong h thng.

Cn bng s bcng sut tc dng c thc hin trong ch ph ti cc i cah thng. phng trnh cn bng cng sut tc dng c dng tng qut sau:


6/83

nMn Hc Mng Li in


nd ycP = P Trong :

ndP : Cng sut tc dng pht ra ca ngun.

ycP : Cng sut tc dng yu cu ca ph ti.

m:

yc pt md td dtP =m P + P + P + P .vi:

m : H sng thi, y m=1.

ptP : Tng cng sut tc dng trong ch cc i.ptP = P1+ P2 +P3 +P4 +P5 +P6=30+25+32+27+34+29=177 MW.

mdP : Tng tn tht cng sut tc dng trn ng dy v trong trmbin p, c ly bng 5% ptP

md

5P = 177=8,85

100 MW.

tdP : Tng cng sut tdng ca nh my in, y tdP =0.

(do chxt tthanh gp cao p ca nh my in hay trm bin p a phng).

dtP : Tng cng sut d tr ca mng in (y ta coi h thng c cngsut v cng ln nn dtP =0).

Vy:

nd ycP = P =177+8,85=185,85 MW.Do gi thit ngun cung cp cng sut tc dng nn ta khng cn bng chng.

1.3 CN BNG CNG SUT PHN KHNG

m bo cht lng in p cn thit cc htiu th trong h thng in vtrong cc khu vc ring bit ca n, cn c y cng sut ca cc ngun cng sut

phn khng. V vy trong giai on u ca thit kpht trin h thng in hay ccmng in ca cc vng ring bit cn phi tin hnh cn bng s bcng sut phnkhng ca li in.


7/83

nMn Hc Mng Li in


Cn bng cng sut phn khng trong mng in thit kc ting hnh chungi vi c h thng.

Cn bng cng sut phn khng c tin hnh i vi ch cc i ca h thngin v phng trnh cn bng trong trng hp ny c dng:

nd ycQ = Q (c thc thm b cng sut phn khng).

6

nd b pti mba L C

i 1

Q Q m. Q Q Q Q

Trong :

ndQ : tng cng sut phn khng ca cc my pht trong cc nh my in.

bQ : cng sut ca cc thit bb.

ptiQ : cng sut phn khng ca cc ph ti.

mbaQ : tn tht cng sut phn khng ca cc my bin p.

CQ : cng sut phn khng sinh ra bi dung khng ng dy.

LQ : tn tht cng sut phn khng cm khng ng dy.

(vi gi thit td dtQ 0,Q 0 ).

Kim tra biu thc trn ta c:nd nd nd

Q =tg P (Vi nd ndcos =0,85 tg =0,6197 ).

ndQ =0,6197.185,85=115,171 MVAr.

ycQ : Tng cng sut phn khng yu cu ca ph ti.

M:

6

yc pti mba L C

i 1

Q m. Q Q Q Q

.

Vi

m: l h s ng thi m=1.

6

pti

i 1

Q

: Tng cng sut phn khng ca ph ti ch cc i.


8/83

nMn Hc Mng Li in


6

pti

i 1

Q

= Q1+ Q2 + Q3 + Q4 + Q5 + Q6

M:

Qi=Pi.tg i ( cos i=0,9 tg i=0,484) do ta c bng sau:

Ph ti 1 Ph ti 2 Ph ti 3 Ph ti 4 Ph ti 5 Ph ti 6

Pi(MW) 30 25 32 27 34 29

Qi(MWr) 14,52 12,1 15,488 13,068 16,456 14,036

Bng 1.1

Do :

ptQ =85,67 MVAr.

BAQ : Tng tn tht cng sut phn khng trong cc trm hp c tnh

bng 15%pt

Q ,ta c:

BA

15Q = .85,67=12,85

100 MVAr

L CQ , Q : Tng gm: tn tht cng sut phn khng trn ng dy v

cng sut phn khng do dung dn do ng dy sinh ra. Gi sng dy truyn ticng sut tnhin v ng dy khng tn tht (R=0,G=0). Vy

L CQ Q .

td dtQ Q : Tng cng sut t dng v d tr ca nh my, trong

trng hp ny chng bng 0.

yc

Q =85,67+12,85=98,52 MVAr

Ta thyyc

Q < ndQ nn chng ta khng phi tin hnh b s b.1.4 CC S LIU K THUT C BN

1.4.1Khong cch t nh my ti cc ph ti

Ts mt bng nh my ta c khong cch t nh my n ph ti l:

on N-1 N-2 N-3 N-4 N-5 N-6

l(km) 50,99 86,02 53,85 80 44,72 63,25

Bng 1.2


9/83

nMn Hc Mng Li in


1.4.2Bng thng s ca cc ph ti in

Nh vy ta c bng cc thng s ca cc ph ti thit nh sau:

Ph ti Ln-i(km) Pi(MW) Qi(MVAr)

1 50,99 30 14,52

2 86,02 25 12,1

3 53,85 32 15,448

4 80 27 13,068

5 44,72 34 16,456

6 63,25 29 14,036

Bng 1.3

1.4.3Cc la chn k thut ban u

- Truyn ti in xoay chiu AC.

- Dng ng dy trn khng dy dn trn.

- Dng dy nhm li thp C.

- Dng ct b tng ct thp vi h s vn hnh ng dyvhd

a 0, 04

K hiu dy dn AC-70 AC-95 AC-120 AC-150 AC-185 AC-240

Ct b tng ly tm 300 308 320 336 352 402

Ct thp 380 385 392 403 416 436

Bng 1.4

Gi thnh ng dy trn khng mt mch in p 110kV ( 610 /km).

Ghi ch: Gi thnh ng dy hai mch bng 1,6 ln gi thnh ng dy mtmch.

- Gi thnh trm bin p truyn ti c mt my bin p in p 110/10 kV vi h svn hnh cc thit b trong trm bin p

vha =0,10.

Cng sut nh mc, MV 16 25 32

Gi thnh,910 /trm 15,000 22,000 29,000

Bng 1.5

Ghi ch: Gi thnh trm hai my bin p bng 1,8 ln gi thnh trm c mt my

bin p.


10/83

nMn Hc Mng Li in


CHNG 2

LP PHNG N V TNH TON K THUT CCPHNG N

2.1 T VN

Thit kli in l mt bi ton nh ca bi ton quy hoch li in. Cc chtiu v kinh t - k thut ca mng in ph thuc rt nhiu vo s ca n. V vycc s mng in cn c chn sao cho c chi ph nh nht, m bo tin cycung cp in cn thit, m bo cht lng in nng yu cu ca cc h tiu th,thun tin v an ton trong vn hnh, khnng pht trin trong tng lai v tip nhncc ph ti mi.

Trong thit k hin nay, chn c s ti u ca mng in, ngi ta s

dng phng php nhiu phng n. Tcc vtr cho ca cc ph ti, cn tin hnhd kin mt sphng n tt nht sc chn trn c sso snh chtiu kinh t - kthut ca cc phng n. Mng in cn c tin cy cao, tnh kinh tv linh hot cnthit. Phng n ti u l phng n i tiu chun k thut v c chi ph kinh t nhnht.

2.2 D KIN CC PHNG N CUNG CP IN V CC TIUCHUN TNH TON K THUT

Ta c theo yu cu cung cp in cho 5 h loi I v 1 h loi III, m h loi mt

l nhng h l nhng h tiu thin quan trng, nu nh ngng cung cp in cthgy nguy him n tnh mng v sc khocon ngi, gy thit hi nhiu v kinh t,h hng thit b, lm hng hng lot sn phm, ri lon qu trnh cng ngh phc tp.Do cc phng n cung cp cho cc h loi I phi c cp t hai ngun.Vic lachn cc phng n i dy ca mng in cn m bo cc yu cu chnh sau:

Cung cp in lin tc.

m bo cht lng in nng.

m bo tnh linh hot ca mng in. m bo tnh kinh tv c khnng pht trin trong tng lai.

m bo an ton cho ngi v thit b.

i t ph ti gn ngun n ph ti xa ngun.

Cc mch vng c chiu di khng qu ln.

2.2.1Cc phng n ni dy

Da theo mt bng thit kv yu cu ca cc ph ti, ta a ra 6 phng n idy nh sau:


11/83

nMn Hc Mng Li in


N

S1

S2S3

S5

S4

S6

50,99km

53,85km

44,72km

63,25km

86,02km

80km

Phng n 1

Hnh 2.1

N

S1

S2S3

S5

S4

S6

50,99km

53,85km

44,72km

63,25km

80km

Phng n 2

44,72km

Hnh 2.2


12/83

nMn Hc Mng Li in


N

S1

S2S3

S5

S4

S6

50,99km

44,72km 53,85km

36,06km

44,72km

63,25km

Phng n 3

Hnh 2.3

N

S1

S2S3

S5

S4

S6

50,99km

44,72km 53,85km

36,06km

44,72km

44,72km

Phng n 4

Hnh 2.4


13/83

nMn Hc Mng Li in


N

S1

S2S3

S5

S4

S6

50,99km

53,85km

36,06km

44,72km

44,72km

63,25km

Phng n 5

Hnh 2.5

2.2.2Tiu chun k thut ca phng n

Ta xt tiu chun k thut ca cc phng n cc chlm vic bnh thng v chlm vic sau s c.

Quy nh ti chlm vic bnh thng th in p ti tt ccc nt trong mng

in:dm dm

0, 95U Ui 1, 05U .

Ch s c (s c 1 phn t) tiu chun N-1: dm dm0, 9U Ui 1,1U .Trong qu trnh tnh ton thun tin ta quy nh tn tht in p ln nht vi h

thng c 1 ngun in l tn tht in p t ngun n im c in p thp nht trongmng in. Mc in p trong cc trm hp c th chp nhn l ph hp nu trongcc ch ph ti cc i tn tht in p ln nht ca mng in mt cp in pkhng vt qu 10 n 15% trong chlm vic bnh thng, cn trong cc chs c, tn tht in p ln nht khng vt qu 15 n 20%.

i vi mng kn phc tp, c th chp nhn tn tht in p ln nht 15 n 20%

trong cc chbnh thng v 20 n 25% trong cc ch sau s c. i vi cctn tht nh th, cn s dng cc my bin p iu chnh in p di ti trong cctrm hp.

Khi thit kta qui nh nh sau: max bt dm

max sc dm

U 10%U

U 20%U

2.2.3Phn b cng sut trong mng in

Phn bcng sut trong mng in vi gi thit b qua tn tht cng sut (do cha

c tit din dy dn v cp in p).


14/83

nMn Hc Mng Li in


2.2.4Chn in p nh mc ca mng in

La chn ng in p ca ng dy ti in l mt vic rt quan trng lc thitk h thng in v n c nh hng trc tip ti tnh kinh tv k thut ca mngin. Gi trin p nh mc ca mng in ph thuc vo:

Khong cch truyn ti.

Cng sut truyn ti.

in p nh mc c trong mng in.

Ta nu ra mt s cp in p: 35kV, 110kV, 220kV.

Tnh chi ph kinh t ca cc cp in p t tiu chun k thut.

Ly cp in p c hm chi ph tnh ton nh nht.

Da vo cng thc kinh nghim Still xc nh tr sin p nh mc ca mngin: U 4, 34. L 16.P [kV,km,MW]

Trong :

U l in p nh mc ca mng in.

L l khong cch truyn ti.

P l cng sut truyn ti.

Ta tnh in p nh mc ca tng nhnh ph ti v ly cp in p chung.

Nu 70KV Ui 170KV th ta lydm

U 110kV .

2.2.5Chn tit din dy dn

Chn tit din dy dn l bi ton c bn nht khi thit kli in. C 3 phngphp chn tit din dy dn:

Chn tit din dy dn theo chtiu kinh t.

Chn tit din dy dn theo iu kin pht nng.

Chn tit din dy dn theo iu kin tn tht in p cho php.

Trong ni dung n mn hc li in ta chn tit din dy dn theo ch tiukinh t:

Mt kinh t ca dng in.

D kin dng dy C, ct b tng ct thp, ng dy 2 mch th c hai mch

c t trn cng mt ct,tb

D 5m (i vi mng in 110KV).

Tra ph lc ti liu Thit k cc mng h thng in vi dy C v

maxT 5000h ta c 2ktJ 1,1A / mm .


15/83

nMn Hc Mng Li in


Dng in chy trn cc on ng dy c tnh theo cng thc:

lvmaxii

kt

IF

J

max i

lvmaxi

dm

SI

m. 3.U

Trong :

iF : tit din dy dn ( 2mm ).

lvmaxiI : dng nhnh cc i tnh trn l cn xc nh tit din (kA).

m: sl ng dy trn nhnh.

maxlviS : cng sut truyn ti cc i trnng dy ang xt.

ktJ : mt kinh t ca dng in.

Tit din dy dn chn theo mt kinh tdng in phi tha mi cc iu kinsau:

Tha mn dng in lc s c.

Tha mn iu kin tn tht in p cho php.

Dy dn c chn phi m bo bn vc hc.

Tha mn iu kin vng quang.

Theo iu kin vng quang th tit din dy dn ca dy C nh sau:

i vi in p 110kV: 2min

F 70mm .

i vi in p 220kV: 2minF 240mm .

2.2.6Xc nh cc thng s ca ng dy

2.2.7Xc nh tn tht in p ln nht ca phng n

Tn tht in p ln nht trong phng n hay trong mng in l tn tht in ptnh t ngun n im c in p thp nht trong mng in.

Chlm vic bnh thng vi ph ti cc i

Tn tht in p c tnh theo cng thc:

i i i ii 2dm

P .R Q .XU % .100

U Trong :

Pi,Qi l cng sut tc dng v phn khng cc i trn nhnh i.

Ri,Xi l gi trin trv in khng ca nhnh th i.

H tiu th loi I ta phi dng ng dy 2 mch nn in trv in khng cang dy b gim i mt na.


16/83

nMn Hc Mng Li in


Ch sau s c

Ti mt thi im chxt mt s c, khng xt n s c xp chng.

Vi ng dy hai mch khi xy ra s c nng n nht ta gi thit rng mt ngdy ca nhnh trc tip ni vi ngun bt. Do dy cn li phi ti mt lngcng sut gp i so vi lc vn hnh bnh thng v tn tht in p nhnh s vcng tng ln gp i.

Cc phngn phi tha mn iu kin v tn tht in p sau mi c thdng so snh v mt kinh tl:

Lc vn hnh bnh thng: U% 10 %.

Lc xy ra s c:sc max

U % = 20%.

2.3 TNH TON K THUT PHNG N 1

N

S1

S2S3

S5

S4

S6

50,99km

53,85km

44,72km

63,25km

86,02km

80km

Phng n 1

Hnh 2.7


Da vo cng thc kinh nghim Still tnh ton cho tng lng dy ta c bngs liu sau:


17/83

nMn Hc Mng Li in


L N-1 N-2 N-3 N-4 N-5 N-6

L(km) 50,990 86,020 53,850 80,000 44,720 63,250

Pmax 30,000 25,000 32,000 27,000 34,000 29,000

Qmax 14,520 12,100 15,488 13,068 16,456 14,036

Smax 33,329 27,774 35,551 29,996 37,773 32,218

Ui(kV) 100,00758 95,679038 103,23819 98,20299 105,30382 99,654755

Bng 2.1

Vy ta chn in p nh mc cho mng in l:dm

U =110kV.

2.3.2Xc nh tit din dy dn v cc thng s ca ng dy

Ta chn tit din theo phng php mt kinh t ca dng in ly tit din dydn tiu chun gn nht. Sau tra bng ph lc ta c cc thng s ca dy dn .Kt quc ghi trong bng s liu sau:

L N-1 N-2 N-3 N-4 N-5 N-6

Pi(MW) 30,000 25,000 32,000 27,000 34,000 29,000

Qi(MVAr) 14,520 12,100 15,488 13,068 16,456 14,036

S(MVA) 33,329 27,774 35,551 29,996 37,773 32,218

Ii(A) 87,469 145,781 93,300 78,722 99,131 84,553

Fi(mm2) 79,517 132,529 84,818 71,565 90,119 76,867

DD chn AC-70 AC-120 AC-95 AC-70 AC-95 AC-70

Li(km) 50,990 86,020 53,850 80,000 44,720 63,250

r0( /km) 0,46 0,270 0,330 0,460 0,330 0,460

x0( /km) 0,440 0,423 0,429 0,440 0,429 0,440

b0(10

-6S/km) 2,580 2,690 2,650 2,580 2,650 2,580

R( ) 11,730 23,230 8,890 18,400 7,380 14,550

X( ) 11,220 36,390 11,550 17,600 9,590 13,920

B(10-6

S) 263,110 231,390 285,410 412,800 237,020 326,370

Icp(A) 265,000 380,000 330,000 265,000 330,000 265,000

Bng 2.2

Kim tra iu kin pht nng dy dn khi s c:

Isc N-1 = I1.2 = 87,469.2 = 174,938 A < Icp = 265 AIsc N-2 = I2 = 145,781 < Icp = 380 A


18/83

nMn Hc Mng Li in


Isc N-3 = I3.2 = 93,300.2 = 186,600 A < Icp = 330 A

Isc N-4 = I4.2 = 78,722.2 = 157,444 A < Icp = 265 A

Isc N-5 = I5.2 = 99,131.2 = 198,262 A < Icp = 330 A

Isc N-6 = I6.2 = 84,553.2 = 169,106 A < Icp = 265 AVy tit din dy dn chn tha mn iu kin pht nng khi s c.


2.3.3.1 Ch lm vic bnh thng

L N-1 N-2 N-3 N-4 N-5 N-6

S mch 2 1 2 2 2 2

Ui(kV) 100,008 95,679 103,238 98,203 105,304 99,655

Uibt% 4,255 8,439 3,829 6,007 3,378 5,102

Bng 2.3

VymaxbtU %=8.439%

2.3.3.2 Ch lm vic sau s c

N1 scU % 2.4,255=8,51%

N3 scU % 2.3,829=7,658%

N 4 s cU % 2.6,007=12,014%

N 5 scU % 2.3,378=6,756%

N 6 scU % 2.5,102=10,204%

Vymax sc

U % 12,014%

Vy phng n 1 t yu cu k thut.


19/83

nMn Hc Mng Li in



N

S1

S2S3

S5

S4

S6

50,99km

53,85km

44,72km

63,25km

80km

Phng n 2

44,72km

Hnh 2.8



L N_1 1_2 N_3 N_4 N_5 N_6

L(km) 50,990 44,720 50,000 80,000 44,720 63,250

Pmax 55,000 25,000 32,000 27,000 34,000 29,000

Qmax 26,620 12,100 15,488 13,068 16,456 14,036

Smax 61,103 27,774 35,551 29,996 37,773 32,218

Ui(kV) 132,42264 91,523593 102,88638 98,202989 105,30382 99,654755

Bng 2.4


U =110 kV.




20/83

nMn Hc Mng Li in


L N_1 1_2 N_3 N_4 N_5 N_6

S mch 2,000 1,000 2,000 2,000 2,000 2,000

Pi(MW) 55,000 25,000 32,000 27,000 34,000 29,000

Qi(MVAr) 26,620 12,100 15,488 13,068 16,456 14,036

S(MVA) 61,103 27,774 35,551 29,996 37,773 32,218

Ii(A) 160,360 145,781 93,300 78,722 99,131 84,553

Fi(mm2) 145,781 132,529 84,818 71,565 90,119 76,867


Li(km) 50,990 44,720 50,000 80,000 44,720 63,250

r0( /km) 0,210 0,270 0,330 0,460 0,330 0,460

x0( /km) 0,416 0,423 0,429 0,440 0,429 0,440

b0(10

-6S/km) 2,740 2,690 2,650 2,580 2,650 2,580

R( ) 5,354 12,074 8,250 18,400 7,379 14,548

X( ) 10,606 18,917 10,725 17,600 9,592 13,915

B(10-6

S) 279,425 120,297 265,000 412,800 237,016 326,370

Icp(A) 445,000 380,000 330,000 265,000 330,000 265,000

Bng 2.5Kim tra iu kin pht nng dy dn khi s c:

Isc N-1 = I1.2 = 160,360.2 = 320,720 A < Icp = 445 A

Isc N-2 = I2 = 145,781 < Icp = 380 A

Isc N-3 = I3.2 = 93,300.2 = 186,600 A < Icp = 330 A

Isc N-4 = I4.2 = 78,722.2 = 157,444 A < Icp = 265 A

Isc N-5 = I5.2 = 99,131.2 = 198,262 A < Icp = 330 A

Isc N-6 = I6.2 = 84,553.2 = 169,106 A < Icp = 265 A

Vy tit din dy dn chn tha mn iu kin pht nng khi s c.


21/83

nMn Hc Mng Li in




L N_1 1_2 N_3 N_4 N_5 N_6

L(km) 50,990 44,720 50,000 80,000 44,720 63,250

Ui(kV) 132,423 91,524 102,886 98,203 94,759 106,948

Uibt% 4,767 4,386 3,555 6,007 3,358 4,778

Bng 2.6

Vymax bt nd1 bt 12 bt

U % U % U % 4,767+4,386=9,153%


i vi mch lin thng ta chxt s c vi ng dy gn ngun

N 1 2sc N 1 bt 1 2btU % 2. U % U % 13,92%

N 3scU % 2.3, 555 7,109%

N 4scU % 2.6, 007 12, 013%

N 5scU % 2.3, 358 6, 715%

N 6scU % 2.4, 778 9, 555%

Vy max scU % 13,92%

Vy phng n 2 t yu cu k thut.


22/83

nMn Hc Mng Li in



N

S1

S2S3

S5

S4

S6

50,99km

44,72km 53,85km

36,06km

44,72km

63,25km

Phng n 3

Hnh 2.9

2.5.1chn in p nh mc ca mng in


L N_1 1_2 N_3 3_4 N_5 N_6

L(km) 50,990 44,720 53,850 36,060 44,720 63,250

Pmax 55,000 25,000 59,000 27,000 34,000 29,000

Qmax 26,620 12,100 28,556 13,068 16,456 14,036

Smax 61,103 27,774 65,547 29,996 37,773 32,218

Ui(kV) 132,42264 91,5235928 137,09524 93,894574 105,30382 99,654755

Bng 2.7


U =110kV.




23/83

nMn Hc Mng Li in


L N_1 1_2 N_3 3_4 N_5 N_6

S mch 2,000 1,000 2,000 2,000 2,000 2,000

Pi(MW) 55,000 25,000 59,000 27,000 34,000 29,000

Qi(MVAr) 26,620 12,100 28,556 13,068 16,456 14,036

S(MVA) 61,103 27,774 65,547 29,996 37,773 32,218

Ii(A) 160,360 145,781 172,022 78,722 99,131 84,553

Fi(mm2) 145,781 132,529 156,384 71,565 90,119 76,867


Li(km) 50,990 44,720 53,850 36,060 44,720 63,250

r0( /km) 0,210 0,270 0,210 0,460 0,330 0,460

x0( /km) 0,416 0,423 0,416 0,440 0,429 0,440

b0(10-6

S/km) 2,740 2,690 2,740 2,580 2,650 2,580

R( ) 5,354 12,074 5,654 8,294 7,379 14,548

X( ) 10,606 18,917 11,201 7,933 9,592 13,915

B(10-6

S) 279,425 120,297 295,098 186,070 237,016 326,370

Icp(A) 445,000 380,000 445,000 265,000 330,000 265,000


Isc N-1 = I1.2 = 160,360.2 = 320,720 A < Icp = 445 A

Isc N-2 = I2 = 145,781 < Icp = 380 A

Isc N-3 = I3.2 = 172,022.2 = 344,044 A < Icp = 445 A

Isc 3-4 = I4.2 = 78,722.2 = 157,444 A < Icp = 265 A

Isc N-5 = I5.2 = 99,131.2 = 198,262 A < Icp = 330 A

Isc N-6 = I6.2 = 84,553.2 = 169,106 A < Icp = 265 A



24/83

nMn Hc Mng Li in




L N_1 1_2 N_3 3_4 N_5 N_6

L(km) 50,990 44,720 53,850 36,060 44,720 63,250

Ui(kV) 132,423 91,524 137,095 93,895 105,304 99,655

Uibt% 4,767 4,386 5,400 2,707 3,378 5,101

Bng 2.9

ND 1 2bt ND 1bt 1 2btU % U % U % 4,767+4,386=9,153%

ND 3 4 bt ND 3bt 3 4btU % U % U % 5,400+2,707=8,107%

Vy max bt ND 1bt 1 2btU % U % U % 4,767+4,386=9,153%


i vi mch lin thng ta chxt s c vi ng dy gn ngun:

N 1 2sc N 1sc 1 2btU % U % U % 2.4,767 4,386 13,92%

N 3 4sc N 3sc 3 4btU % U % U % 2.5, 400 2,707 13,507%

N 5scU % 2.3, 378 6, 756%

N 6scU % 2.5,101 10,202%

Vymax sc

U % 13,92%

Vy phng n 3t yu cu k thut.


25/83

nMn Hc Mng Li in



N

S1

S2S3

S5

S4

S6

50,99km

44,72km 53,85km

36,06km

44,72km

44,72km

Phng n 4

Hnh 2.10



L N_1 1_2 N_3 3_4 N_5 5_6

L(km) 50,990 44,720 53,850 36,060 44,720 44,720

Pmax 55,000 25,000 59,000 27,000 63,000 29,000

Qmax 26,620 12,100 28,556 13,068 30,492 14,036

Smax 61,103 27,774 65,547 29,996 69,991 32,218

Ui(kV) 132,42264 91,5235928 137,09524 93,894574 140,81411 97,887928

Bng 2.10


U =110kV.




26/83

nMn Hc Mng Li in


L N-1 1_2 N_3 3_4 N-5 5_6

S mch 2,000 1,000 2,000 2,000 2,000 2,000

Pi(MW) 55,000 25,000 59,000 27,000 63,000 29,000

Qi(MVAr) 26,620 12,100 28,556 13,068 30,492 14,036

S(MVA) 61,103 27,774 65,547 29,996 69,991 32,218

Ii(A) 160,360 145,781 172,022 78,722 183,685 84,553

Fi(mm2) 145,781 132,529 156,384 71,565 166,986 76,867


Li(km) 50,990 44,720 53,850 36,060 44,720 44,720

r0( /km) 0,210 0,270 0,210 0,460 0,210 0,460

x0( /km) 0,416 0,423 0,416 0,440 0,416 0,440

b0(10

-6S/km) 2,740 2,690 2,740 2,580 2,740 2,580

R( ) 5,354 12,074 5,654 8,294 4,696 10,286

X( ) 10,606 18,917 11,201 7,933 9,302 9,838

B(10-6

S) 279,425 120,297 295,098 186,070 245,066 230,755

Icp(A) 445,000 380,000 445,000 265,000 445,000 265,000


Isc N-1 = I1.2 = 160,360.2 = 320,720 A < Icp = 445 A

Isc N-2 = I2 = 145,781 < Icp = 380 A

Isc N-3 = I3.2 = 172,022.2 = 344,044 A < Icp = 445 A

Isc 3-4 = I4.2 = 78,722.2 = 157,444 A < Icp = 265 A

Isc N-5 = I5.2 = 183,685.2 = 367,37 A < Icp = 445 A

Isc N-6 = I6.2 = 84,553.2 = 169,106 A < Icp = 265 A



27/83

nMn Hc Mng Li in




L N_1 1_2 N_3 3_4 N_5 5_6

L(km) 50,990 44,720 53,850 36,060 44,720 44,720

Ui(kV) 132,423 91,524 137,095 93,895 140,814 97,888

ibtU % 4,767 4,386 5,400 2,707 4,789 3,606

Bng 2.12

nd12 bt nd1 bt 12 btU % U % U % 4,767+4,386=9,153%

nd34 bt nd3 bt 34 btU % U % U % 5,400+2,707=8,107%

nd56 bt nd5 bt 56 btU % U % U % 4,789+3.606=8,395%


U % U % U % 4,767+4,386=9,153%


i vi mch lin thng ta chxt s c vi ng dy gn ngun

N 1 2sc N 1sc 1 2btU % U % U % 2.4,767 4,386 13,92%

N 3 4sc N 3sc 3 4btU % U % U % 2.5, 400 2,707 13,507%

N 5 6sc N 5sc 5 6btU % U % U % 2.4,789 3,606 13,184%

Vymax sc

U % 13,920%

Vy phng n 4t yu cu k thut.


N

S1

S2S3

S5

S4

S6

50,99km

44,72km 53,85km

36,06km

44,72km

44,72km

63,25km

Phng n 5


28/83

nMn Hc Mng Li in


Hnh 2.11

2.7.1Phn b cng sut trongmng in

Ph ti Li(km) Pi(MW) Qi(MVAr)

1 50,99 30 14,52

2 86,02 25 12,1

3 53,85 32 15,448

4 80 27 13,068

5 44,72 34 16,456

6 63,25 29 14,036

Bng 2.13

Cng sut trn ng dy N-1 . . .

ND 1 1 2S S S 55 26,62jMVA

Cng sut trn ng dy 1-2 . .

12 2S S 25 12,1jMVA

Cng sut trn ng dy N-3 . . .

ND 3 3 4S S S 59 29,524jMVA

Cng sut trn ng dy 3-4 . .

34 4S S 27+13,068jMVA

Bng 2.14

Phn bcng sut trn mch vng ND-5-6 vi gi thit b qua tn tht cng sut:

N

S5

44,72km

44,72km

63,25km

S6

Hnh 2.12


29/83

nMn Hc Mng Li in


N N

44,72km 44,72km 63,25km

S5 S6

Hnh 2.13

Gi sim 6 l im phn cng sut khi ta c:

. ..

5 656 ND 6 ND 6

ND 5ND 5 56 ND 6

S .(l l ) S .lS 36, 055 i17, 451MVA

l l l

. . . .ND 6 5 6 ND 5S S S S 26,945 i13, 041MVA

. . .

56 ND 5 5S S S 2, 055 i0,995MVA

Vy iu gi sim phn cng sut l ng.



L N_5 N_6 5_6 N_1 1_2 N_3 3_4

L(km) 44,720 63,250 44,720 50,990 44,720 53,850 36,060

Pmax 36,055 26,945 2,055 55,000 25,000 59,000 27,000

Qmax 17,451 13,041 0,995 26,620 12,100 28,556 13,068

Smax 40,056 29,935 2,283 61,103 27,774 65,547 29,996

Ui(kV) 108,204 96,497 38,231 132,423 91,524 137,095 93,895

Bng 2.14Vy ta chn in p nh mc cho mng in l:

dmU =110kV.


30/83

nMn Hc Mng Li in



L N_5 N_6 5_6 N_1 1_2 N_3 3_4

S mch 1,000 1,000 1,000 2,000 1,000 2,000 2,000

Pi(MW) 36,055 26,945 2,055 55,000 25,000 59,000 27,000

Qi(MVAr) 17,451 13,041 0,995 26,620 12,100 28,556 13,068

S(MVA) 40,056 29,935 2,283 61,103 27,774 65,547 29,996

Ii(A) 210,246 157,123 11,983 160,360 145,781 172,022 78,722

Fi(mm2) 191,133 142,839 10,894 145,781 132,529 156,384 71,565

DD chn AC-185 AC-150 AC-70 AC-150 AC-120 AC-150 AC-70

Li(km) 44,720 63,250 44,720 50,990 44,720 53,850 36,060

r0( /km) 0,170 0,210 0,460 0,210 0,270 0,210 0,460

x0( /km) 0,409 0,416 0,440 0,416 0,423 0,416 0,440

b0(106S/km)

2,840 2,740 2,580 2,740 2,690 2,740 2,580

R( ) 7,602 13,283 20,571 5,354 12,074 5,654 8,294

X( ) 18,290 26,312 19,677 10,606 18,917 11,201 7,933

B(10-6

S) 127,005 173,305 115,378 279,425 120,297 295,098 186,070

Icp(A) 510,000 445,000 265,000 445,000 380,000 445,000 265,000

Kim tra iu kin pht nng dy dn khi s c:

Isc N-1 = I1.2 = 160,360.2 = 320,720 A < Icp = 445 A

Isc N-2 = I2 = 145,781 < Icp = 380 A

Isc N-3 = I3.2 = 172,022.2 = 344,044 A < Icp = 445 A

Isc 3-4 = I4.2 = 78,722.2 = 157,444 A < Icp = 265 A

Xc nh dng in s c vi mch kn:

Ngng ng dy ND5:

3 3

56 5 cp

dm

2 2 3 2 2 36 5 6 5

N 6 cp

dm

S .10 37,773.10I 198, 241(A) I (AC 70) 265(A)

3.U 3.110

(P P ) (Q Q ) .10 (63 30,492 ).10I 367,194(A) I (AC 150) 445(A)

3.U 3.110

Ngng ng dy ND6:


31/83

nMn Hc Mng Li in


3 3

65 6 cp

dm

2 2 3 2 2 3

6 5 6 5

N 5 cp

dm

S .10 32,218.10I 169,101(A) I (AC 70) 265(A)

3.U 3.110

(P P ) (Q Q ) .10 (63 30,492 ).10I 367,194(A) I (AC 185) 510(A)

3.U 3.110

Ngng ng dy 56:

3 3

6N 6 cp

dm

3 3

5N 5 cp

dm

S .10 32,218.10I 169,101(A) I (AC 150) 445(A)

3.U 3.110

(S ).10 33,773.10I 177, 262(A) I (AC 185) 510(A)

3.U 3.110

Vy tit din dy dn chn tha mn iu kinpht nng khi s c.

2.7.4Xc nh tn tht in p ln nht ca phng n2.7.4.1 Ch lm vic bnh thng

L N_5 N_6 5_6 N_1 1_2 N_3 3_4

L(km) 44,720 63,250 44,720 50,990 44,720 53,850 36,060

Ui(kV) 108,204 96,497 38,231 132,423 91,524 137,095 93,895

btiU % 4,903 5,794 0,511 4,767 4,386 5,400 2,707

Bng 2.12

N 1 2bt N 1bt 1 2btU % U % U % 4,767+4,386=9,153%

N 3 4bt N 3bt 3 4btU % U % U % 5,400+2,707=8,107%

N 5 6bt N 5bt 5 6btU % U % U % 4,903+0,511=5,414%

N 6btU % 5,794%


U % U % U % 4,767+4,386=9,153%

2.7.4.2Ch lm vic sau s c

i vi mch lin thng ta chxt s c vi ng dy gn ngun:

N 1 2sc N 1sc 1 2btU % U % U % 2.4,767 4,386 13,92%

N 3 4sc N 3sc 3 4btU % U % U % 2.5, 400 2,707 13,507%

i vi mng in kn ta xt s c vi 2 ng dy gn ngun:

t ng dy ND-5:

N 6 5 N 6 6 5U % U % U %


32/83

nMn Hc Mng Li in


Vi

5 6 N 6 5 6 N6N 6 2 2

dm

(P P ).R (Q Q ).X (34 29).13,283 (16,456 14,036).26,312U .100 .100 13,547%

U 110

5 56 5 566 5 2 2

dm

P .R Q .X 34.20,571 16,45.19,677U .100 .100 8,45%

U 110

Vy N65 N6 65U % U % U % =13,547+8,45=21,997%

t ng dy ND-6:

N 5 6 N 5 5 6U % U % U %

Vi

5 6 N5 5 6 N5N 5 2 2

dm

(P P ).R (Q Q ).X (34 29).7,602 (16,456 14,036).18,290U .100 .100 8,567

U 110

6 56 6 565 6 2 2

dm

P .R Q .X 29.20,571 14,036.19,677U .100 .100 7,213%U 110

Vy N 5 6 N5 56U % U % U % =8.567+7.213=15,78%

Vymax scU % 21,997% > 20%

Vy phng n 5 khngt yu cu k thut.


33/83

nMn Hc Mng Li in


CHNG 3

SO SNH KINH T CC PHNG N

3.1 PHNG PHP SO SNH KINH T

Tiu chun so snh cc phng n v mt kinh t l hm chi ph tnh ton hngnm b nht. Chi ph tnh ton hng nm ca mi phng n c tnh theo biu thc:

Z = (atc+ avh).K + A.c

Z = atc.K + Y

Trong :

Z: Hm chi ph tnh ton hng nm [ng]

tca : H snh mc hiu quso snh ca cc vn u t:

tca =

tc

1

T

tcT : Thi gian tiu chun thu hi vn u t, y ly tcT = 8 nm.Vy tca

=0,125.

vha : H s vn hnh hay h s khu hao tu sa thng k v phc v cc

ng dy ca mng in. Ta lyvh

a =0,04.

K: L vn u t ca mng in. Trong n mn hc ny, vn u t chtnh i vi ng dy, cn cc thit bkhc nh trm bin p, my ct, dao cch ly..ta coi nh nhau cc phng n:

K = K0i.li = Ki

iK :Sut vn u t cho 1km ng dy nhnh th I, tit din Fi. Vi lkp (2

mch) th ly iK =1,6 ln chi ph cho ln c cng tit din dy, (tng/km).

il :Chiu di truyn ti nhnh th I[km].

imaxA P .

maxP :Tn tht cng sut tc dng ton h thng lc ph ti cc i (kW).

2 2

i iimax i2

dm

P QP .R

U

imaxP : Tn tht cng sut trn ng dy thi lc ph ti cc i.

: Thi gian tn tht cng sut cc i, ph thuc vo ph ti ( th ph ti)

v tnh cht ca ph ti v c tnh bng cng thc:


34/83

nMn Hc Mng Li in


= (0,124 + Tmax.10-4)2.8760 h

maxT : Thi gian s dng cng sut cc i

maxT =5000h.

Vy = (0,124 + 5000.10-4)2.8760 = 3411h

c: Gi 1kWh in nng tn tht c=600 ng/kWh.

Githnh ng dy trn khng mt mch in p 110kV ( 610 /km).

Ghi ch: Gi thnh ng dy hai mch bng 1,6 ln gi thnh ng dy mtmch.

K hiu dy dn AC-70 AC-95 AC-120 AC-150 AC-185 AC-240

Ct b tng ly tm 300 308 320 336 352 402

Ct thp 380 385 392 403 416 436

Bng 3.1

Phng n ti u nht l phng n c hm chi ph tnh ton hng nm Z nh nht.

3.2 TNH TON V KINH T CHO CC PHNG N

3.2.1Phng n 1

C bng s liu sau:

L N-1 N-2 N-3 N-4 N-5 N-6Loi DD AC-70 AC-120 AC-95 AC-70 AC-95 AC-70

Li(km) 50,990 86,020 53,850 80,000 44,720 63,250

Koi(106/km) 480 320 492,8 480 492,8 480

Ki(106) 24475,2 27526,4 26537,28 38400 22038,02 30360

P(MW) 1,077 1,481 0,929 1,368 0,870 1,248

Bng 3.2

Ta c:

6

iK 169336,896.10

A P. 23785214,968 kWh

Vy tc vhZ (a a ).K A.c (0,125+0,04).6169336,896.10 + 23785214,968.600

6Z 42211,71682.10

3.2.2Phng n 2

C bng s liu sau:


35/83

nMn Hc Mng Li in


L N_1 1_2 N_3 N_4 N_5 N_6

Loi DD AC-150 AC-120 AC-95 AC-70 AC-70 AC-95

Li(km) 50,990 44,720 50,000 80,000 44,720 63,250

Koi(106

/km) 537,6 320 492,8 480 480 492,8Ki(10

6) 27412,22 14310,4 24640 38400 21465,6 31169,6

P(MW) 1,652 0,770 0,862 1,368 0,765 1,231

Bng 3.3

Ta c:

6

iK 157397,824.10

A P. 22673820,31 kWh

Vytc vh

Z (a a ).K A.c (0,125+0,04). 6157397,824.10 +22673820,31.600

6Z 39574,93315.10

3.2.3Phng n 3

C bng s liu sau:

L N_1 1_2 N_3 3_4 N_5 N_6

Loi DD AC-150 AC-120 AC-150 AC-70 AC-95 AC-70Li(km) 50,990 44,720 53,850 36,060 44,720 63,250

Koi(106/km) 537,6 320 492,8 480 480 492,8

Ki(106)

27412,2

214310,4

26537,2

817308,8 21465,6 31169,6

P(MW) 1,652 0,770 2,008 0,617 0,870 1,248

Bng 3.4

Ta c:6

iK 138203,904.10

A P. 24437467,32 kWh

Vy tc vhZ (a a ).K A.c (0,125+0,04).6138203,904.10 +24437467,32.600

6Z 37466,12455.10

3.2.4Phng n 4

C bng s liu sau:


36/83

nMn Hc Mng Li in


L N_1 1_2 N_3 3_4 N_5 5_6

Loi DD AC-150 AC-120 AC-150 AC-70 AC-150 AC-70

Li(km) 50,990 44,720 53,850 36,060 44,720 44,720

Koi(106

/km) 537,6 320 537,6 480 537,6 480Ki(10

6) 27412,22 14310,4 28949,76 17308,8 24041,47 21465,6

P(MW) 1,652 0,770 2,008 0,617 1,901 0,882

Bng 3.5

Ta c:

6

iK 133488,256.10

A P. 26706956.143 kWh

Vytc vh

Z (a a ).K A.c (0,125+0,04). 6133488,256.10 +26706956,143.600

6Z 38049,73592.10

3.3 LA CHN PHNG N HP L NHT

T kt qu tnh ton kinh t - k thut trn ta c bng sau:

Phng n 1 2 3 4

Ubtmax% 8,439 9,153 9,153 9,153 Uscmax% 12,014 13,92 13,92 13,92Z(10

6) 42211,71682 39574,93315 37466,12455 38049,73592

Bng 3.6

Da vo bng kt qu ta la chn phng n c hm chi ph tnh ton Z nh nhtlm phng n thit k.

Vy phng n hp l nht c chn thit kl phng n 3.


37/83

nMn Hc Mng Li in


CHNG 4

CHN MY BIN P V S NI IN

4.1 CHN S LNG V CNG SUT CC MY BIN P TRONG

CC TRM H PTrong cc trm bin p hp, slng v cng sut v chng loi cc my bin

p ph thuc vo cng sut v tnh cht ca ph ti, vo spht trin ca ph ti trongtng lai, vo s cp in p v s ngun cung cp cho trm. Ngi ta mong mun

chn s lng v chng loi my t nht c th. Khi chn my bin p cng cnquan tm n slm vic song song ca chng. Quyt nh cui cng c da trnc sso snh kinh t - k thut cc phng n c th ca trm.

Trong cc trm bin p c hai cp in p, ngi ta dng my bin p ba pha hai

dy qun, c th trong n thit k ta dng my bin p ba pha 2 cun dy110/10kV. Vic dng mt hay hai my bin p ph thuc vo tnh cht ca ph ti ,cng sut tiu th ca n v mt siu kin khc nh s bin thin ca ph ti, iukin chuyn trlp t. Trong phm vi thit kn ta dng my bin p ba pha vivn u t v tn tht in nng nh nht c th.

Trng hp ph ti loi I cn t hai my bin p. Trong trng hp cng sutph ti qu ln khng chn c my bin p, ngi ta cng dng hai hay nhiu mybin p. Trng hp trm chc ph ti loi III c tht mt my bin p nu trong

h thng c my bin p d trlu ng sn sng thay thcho my bin p lm vicb s c.

Cng sut ca cc my bin p phi c chn sao cho m bo cung cp introng tnh trng lm vic bnh thng tng ng vi ph ti cc i khi tt ccc my

bin p u lm vic. Khi c mt my bin p bt k ngh do s c hay sa cha haytrong qu trnh vn hnh kinh t ca trm khi ph ti cc tiu.

Theo quy nh, trong cc iu kin s c ca h thng in, my bin p c

php qu ti 40% ( h s mang ti lc s cqtsc

k = 1,4) khng qu 5 ngy m v thi

gian qu ti mi ngy khng qu 6 giv h s ph ti ban u trc lc qu ti 1sck

khng qu 0,93.

H squ tiqtsc

k = 1,4 c xem nh mt h s tnh ton, c s dng

chn cng sut my bin p theo iu kin qu ti s c. Khi chn cc my bin p, tann tnh ton n khnng qu ti ca chng c th gim c cng sut t v tnhao trong cc my bin p cng nh t hiu qu cao nht viu kin kinh t - kthut.

Cng sut ca cc my bin p c chn theo cng thc sau:


38/83

nMn Hc Mng Li in


Vi ph ti loi I: I IIqtsc dm pt max

k .S S

Vi ph ti loi III:dm pt maxS S

Trong : maxs : cng sut yu cu lc ph ti cc i

qtsck : h squ ti s s k = 1,4

Trong phm vi n mn hc ny, ta coi cng sut nh mc ca my bin p c hiu chnh theo iu kin kh hu.

4.1.1Ph ti I

Ph ti I l ph ti loi I

1maxdm

qtsc

S 33,329S 23,806MVA

k 1,4

Vy ta chn 2 my bin p loi TPDH 25000/110.

4.1.2Ph ti II

Ph ti II l ph ti loi III

dm 2maxS S 27,774MVA

Vy ta chn my bin p loi TPDH 32000/110.

4.1.3Ph ti IIIPh ti III l ph ti loi I

3maxdm

qtsc

S 35,551S 25,394MVA

k 1,4


4.1.4Ph ti IV

Ph ti III l ph ti loi I

4maxdm

qtsc

S 29,996S 21,426MVA

k 1,4


4.1.5Ph ti V


5maxdm

qtsc

S 37,773S 26,981MVA

k 1,4


39/83

nMn Hc Mng Li in



4.1.6Ph ti VI


6maxdm

qtsc

S 32,218S 23,013MVAk 1,4


4.1.7Thng s cc my bin p

Loi my bin p

S liu k thut S liu tnh ton

UcdmkV

UhdmkV

Un%PkW

P0kW

I0% R X Q0k

VAr

TPDH 25000/110 115 11 10,5 120 29 0,8 2,54 55,9 200

TPDH 32000/110 115 11 10,5 145 35 0,75 1,87 43,5 240

Hnh 4.1

4.2 CHN S NI DY TRM H P

4.2.1 Trm ngun

Do ph ti gm 5 htiu th loi I v 1 htiu th loi III nn m bo cungcp in lin tc ta s dng s h thng 2 thanh gp lm vic song song. Khi vnhnh h thng mt thanh gp vn hnh cn mt h thng thanh gp d tr.

I DCL

MC

II

Hnh 4.2


40/83

nMn Hc Mng Li in


4.2.2 Trm trung gian

S dng s h thng thanh gp phn on:

T ngun in

n trm cui

Hnh 4.3

4.2.3Trm cui

Do yu cu vn hnh kinh t trm bin p khi ph ti ch cc tiu c th ctra bt 1 MBA khi trm nn ta chn s cu i vi trm cui.

Dng h thng c hai phn on thanh gp:

Nu l 70(km) th t my ct cao p pha ng dy bi v vi chiu di lns c xy ra do thao tc ng ct nhiu v vy phi t my ct cui ng dy.

Vi l


41/83

nMn Hc Mng Li in


(L70km)

Hnh 4.4

10kV

10k


42/83

nMn Hc Mng Li in


4.2.4S ni dy chi tit li in

2AC-150

2AC-120

2TPDH-32000/11

0

2TPDH-25000/110

50,99km

S

S

44,72km

2AC-150

2AC-70

2TPDH-25000/110

2TPDH-32000/110

53,85km

36,06km

S

S

MCLL

2AC-70

2AC-95

2TPDH-32000/110

2TPDH-25000/110

44,72km

63,25km

S S

Ban VeSo DoNoiDayChinhNguoiVe LeHaiNam

LopHTD3-k53

Truong dai hocBach KhoaHaNoi

GVHD LaMinh Khanh


43/83

n Mn Hc Mng Li in


CHNG 5

TNH TON PHN B CNG SUT TRONG MNG INTNH TON CH XCLP CA MNG IN

5.1 TNH TON CHI TIT S PHN B CNG SUT TRONG MNG IN

Sau khi tin hnh la chn phng n thit k cho mng in, la chn my bin pv s ni in cho mng in ta cn phi tin hnh xc nh cc trng thi vn hnh inhnh ca mng in. Ch vn hnh ca mng v h thng in c c trng bng ccthng s ch ca chng: cc dng cng sut, in p cc nt

Mc ch tnh ch ca mng v h thng in l xc nh cc thng s ch cachng, ngha l tnh cc dng cng sut tc dng v phn khng trong mng in, xc nhin p ti cc nt trong mng in cng nh trn cc thanh gp ca cc trm tiu thin

trong cc ch vn hnh bnh thng khi ph ti cc i v cc tiu, v trong ch sauc c khi ph ti cc i.

Tnh cc ch ca mng v h thng in c thc hin trn cc s thay th(mhnh) ca chng.

Khi xc nh cc dng cng sut v cc tn tht cng sut ta ly in p tt ccc nttrong mng in bng in p nh mc i dmU U 110kV .

5.1.1 Ch ph ti cc i

5.1.1.1 L ngdy N-1-2

S nguyn l v thay th ca mng in:


44/83

n Mn Hc Mng Li in


N2AC-150

50,99km

1AC-120

44,32km

TPDH-

32000/110

2TPDH-

25000/110

S1

S2

NSn1 Sn1 Sn1

Zdn1

Sdn1

jQc1 jQcc1

Sc1

S01

Sb1

Sb1

S1

jQc2 jQcc2

Sd12S12 S12 S12 Sc2

S02

Sb2Sb2

Hnh 5.1: S v s thay th ca mng in

1S

30+14,52j MVA.

ND 1Z =5,354+10,606j

2S

25+12,1j MVA.

1 2Z =12,074+18,917j

Tnh dng cng sut chy vo cun dy cao p trm bin p B2:

Tn tht cng sut trong trm bin p B2:

22

2max n 2maxBA2 02 N2 02

m m

S U %S1S n. P . P . j n. Q

n S n.100.S

2 2

BA2

1 27,774 10,5 27,774S 1 0,029 0,12 j 1 0,2

1 25 1 100 25

= 0,144+2,771j MVA

Dng cng sut chy vo cun dy cao p MB:


45/83

n Mn Hc Mng Li in


C2 2 b2S S S

(25+12,1j)+(0,144+2,771j)=25,144+14,871j MVA

Cng sut in dung u v cui ng dy 12:

24c cc m

Q Q U B

102 2 2

1102

0,601 10

-4

0,727 MVAr

Cng sut sau tng trZ12:

ccC21 2

QS'' S j

2

25,144 + 14,871j0,727j 24,144 + 14,144j MVA

Tn tht cng sut trn ng dy:

2 2 2

1 21 2 1 2 1 22 2

m

S'' (24,144 14,144 )S (R jX ) (12,074 18,917j)

U 110

1 2S

0,83 + 1,301j MVA

Dng cng sut trc tng trZ43:

1 21 2 1 2S' S'' S

(25,144 + 14,144j) + (0,83+ 1,301j) 25.974 + 15.445j MVA

Tnh dng cng sut chy vo cun dy cao p trm in p B1:


22


m m

S U %S1S n. P . P . j n. Q

n S n.100.S

2 2

BA4

1 33,329 10,5 33,329S 2 0,029 0,120 j 2 0,20

2 32 2 100 32

= 0,165 + 2,733j MVA

Dng cng sut chy vo cun dy cao p ca MBA1:

C1 1 BA1S S S

(30 + 14,52j) + (0,165 + 2,733j) 30,165 + 17,253j MVA

Cng sut in dung u v cui ng dy N 1:

24c cc m

Q Q U B 10

2 2 2

1102 1.397 10-4 1.690 MVAr

Cng sut sau tng trZN1:

ccN 1 c1-2C1N1 2 1 2

Q QS'' S j S' j2 2


46/83

n Mn Hc Mng Li in


= (30,165 + 17,253j)1,69j + (25,974+ 15.445j)0,727j = 56,139 + 30,281j MVA

Tn tht cng sut trn ng dyN 1:

2 2 2

N 1N 1

N 1 N 1

2 2m

S'' (56,139 30,281 )S (R jX ) (5,354 10,606j)

U 110

N 1S

1,8 + 3,566 MVA

Dng cng sut trc tng trZN1:

N 1N 1 N 1S' S'' S

(56,169 + 30,281j) + (1,8 + 3,566j) 57,939 + 33,847j MVA

Cng sut yu cu trn ng y N-1:

cN 1 N 1 QS S' j2

(57,939 + 33,847j)1,69j 57,939 + 32,157j MVA

5.1.1.2 L ng dy N-5

S nguyn l v thay th ca mng in:

Hnh 5.2

5S

34 + 16,456j MVA; ZN5= 7,379 + 9,592j


N

2AC - 95

TPDH 32000/110

S

5

N

5

b5SSc5N-5SSdN-5

N-5SSN-5Sb5

b5ZdN-5ZjQ

cccjQ

05S

,,,

S5

2 2


47/83

n Mn Hc Mng Li in


22

5max n 5maxBA5 05 n5 05

m m

S U %S1S n. P . P . j n. Q

n S n.100.S

2 2

BA5

1 37,773 10,5 37,773

S 2 0,035 0,145 j 2 0,242 32 2 100 32

= 0,171 + 2,821j MVA


C5 5 BA5S S S

(34 + 16,456j) + (0,171 + 2,821j) 34,171 + 19,277j MVA

Cng sut in dung u v cui ng dyN-5:

2

4c cc mQ Q U B 102 2 2

1102 1,185 10-4 1,434 MVAr


ccC5N 5

QS'' S j

2

(34,171 + 19,277j)1,434j 34,171 + 17,843j MVA

Tn tht cng sut trn ng dyN-5:

2 2

ND 5

N 5 dN 5 dN 52 2m

S'' (34,171 17,843 )

S (R jX ) (7,379 9,592j)U 110

= 0,906+ 1,178j MVA


N 5N 5 N 5S' S'' S

(34,171 + 17.843j) + (0,906 + 1,178j) 35,077 + 19.021j MVA

Cng sut yu cu ti ph ti 5:

c

ND 5 N-5

QS S' j 2

(35,077 + 19,021j)1,434j 35,077 + 17,587j MVA

Tnh ton tng t cho cc on ng dy khc ta c bng kt qu sau:


48/83

n Mn Hc Mng Li in


Nhnh diZ ( ) 4B

(10 S)2

0iS (MVA)

biZ ( ) iS (MVA)

N-1 5,354+10,606j 1,397 0,058+0,4j 1,27+27,95j 30+14,52j

1-2 12,074+18,917j 0,601 0,035+0,24j 1,87+43,5j 25+12,1j

N-3 5,654+11,201j 1,475 0,07+0,48j 0,935+21,75j 32+15,488j

3-4 8,294+7,933j 0,930 0,058+0,4j 1,27+27,95j 27+13,068j

N-5 7,379+9,592j 1,185 0,07+0,48j 0,935+21,75j 34+16,456j

N-6 14,548+13,915j 1,632 0,058+0,4j 1,27+27,95j 29+14,036j

Bng 5.1


49/83

n Mn Hc Mng Li in


Nhnh i maxS

(MVA)BAS

(MVA) CS

(MVA) jQC/2(MVAr) S''

(MVA) dS

(MVA) S'

(MVA) ijS

(MVA) NiS

(MVA)

N-1 30+14,52j 0,165+2,733j 30,165+17,253j 1,69j 56,139+30,281j 1,8+3,566j 57,939+33,847j 57,939+32,157j

1-2 25+12,1j 0,144+2,771j 25,144+14,871j 0,727j 25,144+14,144j 0,83+1,301j 25,974+15,445j 25,974+14,718j

N-3 32+15,488j 0,159+2,554j 32,159+18,042j 1,785j 59,947+29,98j 2,099+4,159j 62,046+34,139j 62,046+32,354j

3-4 27+13,068j 0,144+2,289j 27,144+15,357j 1,125j 27,144+14,232j 0,644+0,616j 27,788+14,848j 27,788+13,723j

N-5 34+16,456j 0,171+2,821j 34,171+19,277j 1,434j 34,171+17,843j 0,906+1,178j 35,077+19,021j 35,077+17,587j

N-6 29+14,036j 0,158+2,58j 29,158+16,616j 1,975j 29,158+14,641j 1,28+1,224j 30,438+15,865j 30,438+13,89j

Tng 177+85,668 0,941+15,748j 7,559+12,044j 185,5+95,988j

Bng 5.2


50/83

n Mn Hc Mng li in

L Hi Nam- lp htd3k53 Page 50

5.1.1.3 Cn bng chnh c cng sut trong h thng

T bng s liu ta c tng cng sut yu cu trn thanh gp 110 kV ca ngun in:

ycS

185,5 + 95,988j MVA

m bo iu kin cn bng cng sut trong h thng, cc ngun in phi cung cp cng sut theo yu cu. V vy tng cng sut tc dng do h thng v nh my cn phicung cp:

Pcc = 185,5 MW

Khi h s cng sut ca cc ngun bng 0,85 th tng cng sut phn khng ca h thngv nh my in c th cung cp:

Qcc = Pcc tg = 185,5 0,62 = 115,01 MVAr

Nh vy : ccS

185,5 + 115,01j MVA

T kt qu trn nhn thy rng cng sut phn khng do cc ngun cung cp ln hncng sut phn khng yu cu. V vy khng cn b cng sut phn khng trong ch phti cc i.

5.1.2 Ch ph ti cc tiu

Xt ch vn hnh kinh t cc trm h p khi ph ti cc tiu.

Trong ch ph ti cc tiu c th ct bt mt my bin p trong cc trm, song cnphi tho mn iu kin sau:

0pt gh m

n

n. PS S S

(n 1). P

i vi trm c 2 my bin p th:

0gh m

n

2 PS S .

P

i vi trm c 1 my bin p th:gh m

S S

Kt qu tnh cc gi tr cng sut ph ti v cng sut gii hn:


51/83

n Mn Hc Mng li in


Ph ti P0 (kW) PN (kW) Sm(MVA) Spt (MVA) Sgh (MVA) S MB

1 29 120 25 16,665 17,381 1

3 35 145 32 17,776 22,234 1

4 29 120 25 14,998 17,381 1

5 35 145 32 18,887 22,234 1

6 29 120 25 16,109 17,381 1

Bng 5.3

Cc kt qu tnh ton trn cho thy rng, trong ch ph ti cc tiu tt c cc trmu vn hnh 1 my.

Tnh ton tng t ch max ta c bng kt qu tnh ton sau:

Bng thng scc phn t trong ch cc tiu

NhnhdiZ ( )

4B

(10 S)2

0iS (MVA)

biZ ( )

iS (MVA)

N-1 5,354+10,606j 1,397 0,029+0,2j 2,54+55,9j 15+7,26j

1-2 12,074+18,917j 0,601 0,035+0,24j 1,87+43,5j 12,5+6,05j

N-3 5,654+11,201j 1,475 0,035+0,24j 1,87+43,5j 16+7,744j

3-4 8,294+7,933j 0,930 0,029+0,2j 2,54+55,9j 13,5+6,534j

N-5 7,379+9,592j 1,185 0,035+0,24j 1,87+43,5j 17+8,228j

N-6 14,548+13,915j 1,632 0,029+0,2j 2,54+55,9j 14,5+7,018j

Bng 5.4


52/83

n Mn Hc Mng li in


5.1.2.1 L ng dy N-5

Hnh 5.3

5S

17 + 8,228j MVA; ZN5= 7,379 + 9,592j


22

5 min n 5minBA5 05 n5 05

m m

S U %S1S n. P . P . j n. Q

n S n.100.S

2 2

BA1

18,887 10,5 18,887S 0,035 0,145 j 0,24

32 100 32

= 0,079 + 1,29j MVADng cng sut chy vo cun dy cao p ca MBA 1:

C5 5 BA5S S S

(17,086 + 9,638j) + (0,079 + 1,29j) 17,086+ 9,638j MVA

Cng sut in dung u v cui ng dyN-5:

24c cc m

Q Q U B 10

2 2 2

1102 1,185 10-4 1,434 MVAr

Cng sut sau tng trZN5

:

N 2AC - 85TPDH 32000/110

S

5

N

5

b5SSc5N-5SSdN-5

N-5SSN-5Sb5

b5ZdN-5Z

jQccc

jQ05S

,,,

S5

2 2


53/83

n Mn Hc Mng li in


ccC5N 5

QS'' S j

2

(17,086 + 9,638j)1,434j 17,086 + 8,204j MVA


2 2 2N 5

N 5 dN 5 dN 52 2

m

S'' (17,086 8,204 )S (R jX ) (7,379 9,592j)U 110

N 5S

0,219+ 0,285j MVA


N 1N 1 N 1S' S'' S

(17,305 + 8,489j) + (0,219 + 0,285j) 17,305 + 8,489j MVA


cN 5 N-5

QS S' j

2

(17,305 + 7,055j)1,434j 17,305 + 7,055j MVA

5.1.2.2 L ng dy N-1-2

N 2AC-150 2AC-120

TPDH-32000/110

2TPDH-25000/11

0

S

4

3

2

1S


54/83

n Mn Hc Mng li in


Hnh 5.4

1S

15 + 7,26j MVA; ZN1= 5,354 + 10,606j

2S

12,5 + 6,05j MVA; Z12= 12,074 + 18,917j

Tnh dng cng sut chy vo cun dy cao p trm in p B2


2

22min n 2 min

BA2 02 N2 02

m m

1 S U %SS n. P . P . j n. Qn S n.100.S

2 2

BA3

1 13,887 10,5 13,887S 0,029 0,12 j 0,2

2 25 100 25

= 0,062 + 0,873j MVA


C2 2 b2S S S

(12,5 + 6,05j) + (0,062+ 0,873j) 12,562 + 6,923j MVA


24c cc m

Q Q U B 10

2 2 2

1102 0,601.10-4 0,727 MVAr


ccC21 2

QS'' S j

2

(12,562 + 6,923j)0,727j 12,562 + 6,196j MVA

S2

Sb2b2SSc22SSd2

S1

Sb1

b1S

c1S

S11SS1N1S

Zd1 d2Z b2Z

01

S

02S

2S,,,,,,

cjQ

2cc

jQ

2c

jQ

2cc

jQ

2


55/83

n Mn Hc Mng li in



2 2 2

1 21 2 1 2 1 22 2

m

S'' (12,562 6,196 )S (R jX ) (12,074 18,917j)

U 110

1 2S

0,196 + 0,307j MVA


1 21 2 1 2S' S'' S

(12,562 + 6,196j) + (0,196+ 0,307j) 12,758 + 6,503j MVA



22

1min n 1minBA1 01 N1 01

m m

1 S U %SS n. P . P . j n. Q

n S n.100.S

2 2

BA1

16,665 10,5 16,665S 0,029 0,12 j 0,2

25 100 25

= 0,082 + 1,366j MVA


C1 1 BA1S S S

(15 + 7,26j) + (0,082 + 1,366j) 15,082 + 8.626j MVA

Cng sut in dung u v cui ng dy N 4:

24c cc mQ Q U B 10

2 2 2

1102 1,397 10-4 1,690 MVAr


ccN 1 c1 2C1N 1 1 2

Q QS'' S j S' j

2 2

= (15,082 + 8,626j)1,69j + (12,758 + 6,503j)0,727j = 27,84 + 12,712j MVA

Tn tht cng sut trn ng dyN 4:

2 2 2

N 1N 1 N 1 N 12 2

m

S'' (27,84 12,712 )S (R jX ) (5,354 10,606j)

U 110

N 1S

0,414 + 0,821j MVA



56/83

n Mn Hc Mng li in


N 1N 1 N 1S' S'' S

(27,84 + 12,712j) + (0,414 + 0,821j) 28,254 + 13,533j MVA


c

N 1

N 1

Q

S S' j 2

(28,254 + 13.533j)1,69j 28,254 + 11,843j MVA

Tnh ton tng t cho cc on dy khc ta c bng kt qu sau:

Nhnh diZ ( ) 4B

(10 S)2

0iS (MVA)

biZ ( ) iS (MVA)

N-1 5,354+10,606j 1,397 0,029+0,2j 2,54+55,9j 15+7,26j

1-2 12,074+18,917j 0,601 0,035+0,24j 1,87+43,5j 12,5+6,05j

N-3 5,654+11,201j 1,475 0,035+0,24j 1,87+43,5j 16+7,744j

3-4 8,294+7,933j 0,930 0,029+0,2j 2,54+55,9j 13,5+6,534j

N-5 7,379+9,592j 1,185 0,035+0,24j 1,87+43,5j 17+8,228j

N-6 14,548+13,915j 1,632 0,029+0,2j 2,54+55,9j 14,5+7,018j

Bng 5.5


57/83

n Mn Hc Mng Li in


Nhnhi minS

(MVA) BAS

(MVA) CS


(MVA) dS

(MVA) S'

(MVA) ijS

(MVA) NiS

(MVA)

N-1 15+7,26j 0,082+1,366j 15,082+8,626j 1,69j 27,84+12,712j 0,414+0,821j28,254+13,53

3j28,254+11,843j

1-2 12,5+6,05j 0,062+0,873j 12,562+6,923j 0,727j 12,562+6,196j 0,196+0,307j 12,758+6,503j 12,758+5,776j

N-3 16+7,744j 0,08+1,277j 16,08+9,021j 1,785j29,808+12,814

j0,492+0,975j 30,3+13,789j 30,3+12,004j

3-4 13,5+6,534j 0,072+1,145j 13,572+7,679j 1,125j 13,572+6,554j 0,156+0,149j 13,728+6,703j 13,728+5,578j

N-5 17+8,228j 0,086+1,41j 17,086+9,638j 1,434j 17,086+8,204j 0,219+0,285j 17,305+8,489j 17,305+7,055j

N-6 14,5+7,018j 0,079+1,29j 14,579+8,308j 1,975j 14,579+6,333j 0,304+0,291j 14,883+6,624j 14,883+4,649j

Tng 0,461+7,361j 1,781+2,828j 90,742+35,551j

Bng 5.6


58/83

n Mn Hc Mng Li in


5.1.2.3 Cn bng chnh c cng sut trong h thng


ycS

90,742+35,551j MVA


Pcc = 90,742 MW


Qcc = Pcc tg = 90,742 0,62 = 56,26 MVAr

Nh vy : ccS

90,742 + 56,26j MVA

T kt qu trn nhn thy rng cng sut phn khng do cc ngun cung cp ln hncng sut phn khng yu cu. V vy khng cn b cng sut phn khng trong ch phti cc tiu.

5.1.3 Ch s c

Khi xt s c t mt mch l kp ta khng gi thit s c xp chng nn ta ch xttrng hp ngng mt mch trn cc ng dy ni t ngun n cc ph ti khi ph ti cc

i.

Thng sng dy trong ch s c:

NhnhdiZ ( )

4B

(10 S)2

0iS (MVA)

biZ ( )

iS (MVA)

N-1 10,708+21,212j 0,699 0,058+0,4j 1,27+27,95j 30+14,52j

1-2 12,074+18,917j 0,601 0,035+0,24j 1,87+43,5j 25+12,1j

N-3 11,309+22,402j 0,738 0,07+0,48j 0,935+21,75j 32+15,488j

3-4 8,294+7,933j 0,930 0,058+0,4j 1,27+27,95j 27+13,068j

N-5 14,758+19,185j 0,593 0,07+0,48j 0,935+21,75j 34+16,456j

N-6 29,095+27,83j 0,816 0,058+0,4j 1,27+27,95j 29+14,036j

Bng 5.7


59/83

n Mn Hc Mng Li in


5.1.3.1 L ng dy N-5

Hnh 5.5

5S

34 + 16,46j MVA; ZN1 = 10,708 + 21,212j


22

5max n 5maxBA5 05 n5 05

m m

S U %S1S n. P . P . j n. Q

n S n.100.S

2 2

BA5

1 37,773 10,5 37,773S 2 0,035 0,145 j 2 0,24

2 32 2 100 32

= 0,171 + 2,821j MVA


C5 5 BA5S S S

(34 + 16.456j) + (0,171+ 2,821j) 34,171 + 19,277j MVA

Cng sut in dung u v cui ng dyN 1:

24c cc m

Q Q U B 10

2 2 2

1102 0,593 10-4 0,718 MVAr


N 2AC - 95TPDH 32000/110

S

5

N

5

b5SSc5N-5SSdN-5

N-5SSN-5Sb5

b5ZdN-5Z

jQccc

jQ05S

,,,

S5

2 2


60/83

n Mn Hc Mng Li in


ccC5N 5

QS'' S j

2

(34,171 + 19,277j)0,718j 37,171 + 18,559j MVA


2 2 2N 5

N 5 N 5 N 52 2

m

S'' (34,171 18,559 )S (R jX ) (14,758 19,185j)U 110

N 5S

1,844 + 2,397j MVA


N 5N 5 N 5S' S'' S

(34,171 + 18,559j) + (1,844+ 2,397j) = 36,015 + 20,956j MVA


cN 5 N 5

QS S' j

2

(36,015 + 20,956j)0,718j 36,015 + 20,238j MVA

5.1.3.2 L ng dy N-1-2

N AC-150 AC-120

TPDH-32000/110

2TPDH-25000/110

S

1

2

2

1S


61/83

n Mn Hc Mng Li in


1S

30 + 14,52j MVA; ZN1= 10,708 + 21,212j

2S

25 + 12,10j MVA; Z12= 12,074 + 18,917j



22

2max n 2 maxBA2 02 N2 02

m m

S U %S1S n. P . P . j n. Q

n S n.100.S

2 2

BA2

1 27,774 10,5 27,774S 2 0,035 0,145 j 2 0,4

2 32 2 100 32

= 0,144 + 2,771j MVA


C2 2 b2S S S

(25 + 12,1j) + (0,144 + 2,771j) 25,144 + 14,871j MVA


24c cc m

Q Q U B 10

2 2 2

1102 0,601 10-4 0,727 MVAr


ccC21 2

QS'' S j

2

(25,144 + 14,871j)0,727j 25,144 + 14,144j MVA


S2

Sb2b2SSc22SSd2

S1

Sb1

b1S

c1S

S11SS1N1S

Zd1 d2Z b2Z

01

S

02S

2S,,,,,,

cjQ

2cc

jQ

2c

jQ

2cc

jQ

2


62/83

n Mn Hc Mng Li in


2 2 2

1 21 2 1 2 1 22 2

m

S'' (25,144 14,144 )S (R jX ) (12,074 18,917j)

U 110

1 2S

0,83 + 1,301j MVA


1 21 2 1 2S' S'' S

(25,144 + 14,144j) + (0,83+ 1,301j) 25,974 + 15,445j MVA



22


m m

S U %S1S n. P . P . j n. Q

n S n.100.S

2 2

BA1

1 33,329 10,5 33,329S 2 0,029 0,12 j 2 0,2

2 25 2 100 25

= 0,165 + 2,733j MVA


C1 1 BA1S S S

(30 + 14,52j) + (0,165+ 2,733j) 30,165 + 17,253j MVA

Cng sut in dung u v cui ng dy N1:

24c cc m

Q Q U B 10

2 2 2

1102 0,699 10-4 0,846 MVAr


ccN 1 cN 2C1N 1 N 2

Q QS'' S j S' j

2 2

= (30,1656 + 17,253j)0,846j + (25,974+ 15,445j)0,727j = 56,139 + 31,125j MVA

Tn tht cng sut trn ng dyN1:

2 2 2

N 1N 1 N 1 N 12 2

m

S'' (56,139 31,125 )S (R jX ) (10,708 21,212j)

U 110

N 4S

3,646 + 7,223j MVA


N 1N 1 N 1S' S'' S

(56,139 + 31,125j) + (3,646 + 7,223j) 59,785 + 38,348j MVA


63/83

n Mn Hc Mng Li in


Cng sut yu cu ti trn ng dy N-1:

cN 1 N 1

QS S' j

2

(59,785 + 38,348j) 0,846j 59,785 + 37,502j MVA

Tnh ton tng t cho cc on dy khc ta c bng kt qu sau:

Nhnh diZ ( ) 4B

(10 S)2

0iS (MVA)

biZ ( ) iS (MVA)

N-1 10,708+21,212j 0,699 0,058+0,4j 1,27+27,95j 30+14,52j

1-2 12,074+18,917j 0,601 0,035+0,24j 1,87+43,5j 25+12,1j

N-3 11,309+22,402j 0,738 0,07+0,48j 0,935+21,75j 32+15,488j

3-4 8,294+7,933j 0,930 0,058+0,4j 1,27+27,95j 27+13,068j

N-5 14,758+19,185j 0,593 0,07+0,48j 0,935+21,75j 34+16,456j

N-6 29,095+27,83j 0,816 0,058+0,4j 1,27+27,95j 29+14,036j

Bng 5.8


64/83

n Mn Hc Mng Li in


Nhnh i maxS

(MVA)BAS

(MVA) CS


(MVA) dS

(MVA) S'

(MVA) ijS

(MVA) NiS

(MVA)

N-1 30+14,52j 0,165+2,733j 30,165+17,253j 0,846j 56,139+31,125j 3,646+7,223j 59,785+38,348j 59,785+37,502j

1-2 25+12,1j 0,144+2,771j 25,144+14,871j 0,727j 25,144+14,144j 0,83+1,301j 25,974+15,445j 25,974+14,718j

N-3 32+15,488j 0,159+2,554j 32,159+18,042j 0,893j 59,947+30,872j 4,249+8,418j 64,196+39,29j 64,196+38,397j

3-4 27+13,068j 0,144+2,289j 27,144+15,357j 1,125j 27,144+14,232j 0,644+0,616j 27,788+14,848j 27,788+13,723j

N-5 34+16,456j 0,171+2,821j 34,171+19,277j 0,718j 34,171+18,559j 1,844+2,397j 36,015+20,956j 36,015+20,238j

N-6 29+14,036j 0,158+2,58j 29,158+16,616j 0,987j 29,158+15,629j 2,632+2,517j 31,79+18,146j 31,79+17,159j

Tng 0,941+15,748j 13,845+22,472j 191,786+113,296j

Bng 5.9


65/83

n Mn Hc Mng Li in


5.1.3.3 Cn bng chnh c cng sut trong hthng


ycS

191,786+113,296j MVA


Pcc = 191,786 MW


Qcc = Pcc tg = 191,786 0,62 = 118,907 MVAr

Nh vy : ccS

191,786 + 118,907j MVA

T kt qu trn nhn thy rng cng sut phn khng do cc ngun cung cp ln hncng sut phn khng yu cu. V vy khng cn b cng sut phn khng trong ch phti s c.

5.2 TNH TON IN P TI CC IM NT CA MNG IN

5.2.1 Ch ph ti cc i

Chn in p trn thanh ci cao p h thng l 121 kV (Ucs = 121 kV) ng dy N12

in p trn thanh gp cao p trm bin p 1:

U1 = Ucs -N 1 N 1 N 1 N 1

cs

P' R Q' X

U

= 121 -57,939 5,354 33,847 10,606

121

= 115,47 kV

Cng sut trc tng tr trm bin p 1 Zb1:

b1 C1 01S S S

(30,165 + 17,253j)(0,058+0,4j) 30,107 + 16,853j MVA

in p trn thanh gp hp trm bin p 1 quy vcao p:

U1q = U1 -b1 b1 b1 b1

1

P R Q X

U

= 115,47 -

30,107 1,27 16,853 27,95

115,47

= 111,06 kV


66/83

n Mn Hc Mng Li in


in p trn thanh gp cao p trm bin p2:

U2 = U1 -1 2 1 2 1 2 1 2

1

P' R Q' X

U

= 115,47 - 25,974 12,074 15,445 18,917115,47

= 110,224 kV


b2 C2 02S S S

(25,144 + 14,871j)(0,0350,24j) 25,109 + 14,631j MVA


U2q = U2 -b2 b2 b2 b2

2

P R Q X

U

= 110,224 -25,109 1,87 14,631 43,5

110,224

= 104,024 kV

ng dy N5

in p trnthanh gp cao p trm bin p5:

U5 = Ucs -N 5 N 5 N 5 N 5

cs

P' R Q' X

U

= 121 -35,077 7,379 19,021 9,592

121

= 117,353 kV


b5 C5 05S S S

(34,171 + 19,277j)(0,070,48j) 34,101+ 18,797j MVA


U5q

= U5

- b5 b5 b5 b5

5

P R Q X

U

= 117,353 -34,101, 0,935 18,797 21,75

117,353

= 113,598 kV

Tnh in p trn cc ng dy cn li c thc hin tng t.

Kt qu tnh in p trn thanh gp h p ca cc trm quy v in p cao trongch ph ti cc i cho trong bng sau:


67/83

n Mn Hc Mng Li in


Gi tr in p trn thanh gp h p quy v cao p trong ch ph ti cc i

Trm B 1 2 3 4 5 6

Uq(kV) 111,06 104,024 111,357 107,868 113,598 111,272

Bng 5.10

5.2.2 Ch ph ti cc tiu

Chn in p trn thanh ci cao p h thng l 115 kV (U cs = 115 kV)

ng dy N12

in p trn thanh gp cao p trm bin p 1:

U1 = Ucs -N 1 N 1 N 1 N 1

cs

P' R Q' X

U

= 115 -28,254 5,354 13,533 10,606

115

= 112,436 kV


b1 C1 01S S S

(15,082 + 8,626j)(0,0290,2j) 15,053+ 8,426j MVA


U1q = U1 - b1 b1 b1 b1

1

P R Q XU

= 112,436 -15,053 2,54 8,426 55,9

112,436

= 107,907 kV


U2 = U1 -1 2 1 2 1 2 1 2

1

P' R Q' X

U

= 112,436 -12,758 12,074 6,503 18,917

112,436

= 109,972 kV


2 C2 02S S S

b (12,562 + 6,923j)(0,035+0,24j) 12,527 + 6,683j MVA


U2q

= U2

- b2 b2 b2 b2

2

P R Q X

U


68/83

n Mn Hc Mng Li in


= 109,972 -12,527 1,87 6,683 43,5

109,972

= 107,115 kV

ng dy N-5

in p trnthanh gp cao p trm bin p 5:

U5 = Ucs -N 5 N 5 N 5 N 5

cs

P' R Q' X

U

= 115 -17,305 7,379 8,489.9,592

115

= 113,182 kV


b5 C5 05S S S

(17,086 + 9,638j)(0,035+0,24j) 17,051 + 9,398j MVA


U5q = U5 -b5 b5 b5 b5

5

P R Q X

U

= 113,182 -17,051 1,87 9,398 43,5

113,182

= 109,288 kV


Kt qu tnh in p trn thanh gp h p ca cc trm quy v in p cao trongch ph ti cc tiu cho trong bng sau:

Gi tr in p trn thanh gp h p quy v cao p trong ch ph ti cc tiu:

Trm B 1 2 3 4 5 6

U (kV) 107,907 107,115 108,494 106,59 109,288 107,952

Bng 5.11

5.2.3 Ch sau s cChn in p trn thanh ci cao p h thng l 121 kV (Ucs = 121 kV). Xt trng hp s

c khi ngng mt mch l kp.

Chn in p trn thanh ci cao p h thng l 121 kV (Ucs = 121 kV)

ng dy N-1-2


U1 = Ucs -N 1 N 1 N 1 N 1

cs

P' R Q' X

U


69/83

n Mn Hc Mng Li in


= 121 -59,785 10,708 38,348 21,212

121

= 108,987 kV


b1 C1 01S S S

(30,165 + 17,253j)(0,058+0,4j) 30,107 + 16,853j MVA


U1q = U1 -b1 b1 b1 b1

1

P R Q X

U

= 108,987 -30,107 1,27 16,853 27,95

108,987

= 104,314 kV


U2 = U1 -1 2 1 2 1 2 1 2

1

P' R Q' X

U

= 108,987 -25,974 12,074 15,445 18,917

108,987

= 103,429 kV


b2 C 02S S S

(25,144 + 14,871j)(0,0350,24j) 25,109 + 14,631j MVA


U2q = U2 -b2 b2 b2 b2

2

P R Q X

U

= 103,429 -25,109 1,87 14,631 43,5

103,429

= 96,822 kV

ng dy N5

in p trnthanh gp cao p trm bin p 5:

U5 = Ucs -N 5 N 5 N 5 N 5

cs

P' R Q' X

U

= 121 -36,79 14,758 20,956 19,185

121

= 113,285 kV


b5 C5 05S S S

(34,171 + 19,277j)(0,070,48j) 34,101 + 18,797j MVA


70/83

n Mn Hc Mng Li in



U5q = U5 -b5 b5 b5 b5

5

P R Q X

U

= 113,285 - 34,101 0,935 18,797 21,75113,285

= 109,395 kV


Kt qu tnh in p trn thanh gp h p ca cc trm quy v in p cao trong ch

sau s c cho trong bng sau:

Gi tr in p trn thanh gp h p quy v cao p trong ch s c :

Trm B 1 2 3 4 5 6

Uq(kV) 104,314 96,822 103,902 100,163 109,395 104,692

Bng 5.12


71/83

n Mn Hc Mng Li in


CHNG 6

IU CHNH IN P TRONG H THNG IN

in p l mt trong nhng ch tiu cht lng in nng quan trng. N nh hng

nhiu n ch tiu kinh tv k thut ca cc htiu th. Cc thit bin chc th lmvic tt trong nhng trng hp in nng c cht lng cao.

Cht lng in nng c nh gi thng qua cc ch tiu v lch in p, daong in p , skhng i xng v khng sin. Trong chtiu v lch in p l chtiu quan trng nht. m bo c lch in p cc htiu th trong phm vi cho

php ta cn phi tin hnh iu chnh in p theo cc cch sau:

Thay i in p cc my pht trong nh my in.

Thay i t s bin trong cc trm bin p (chn u iu chnh ca cc my binp)

Thay i cc dng cng sut phn khng truyn ti trong mng in .

Thc t cho thy th i vi nhng mng in ln khng thiu chnh in p bngcch thay i in p ti nh my in, v thay i cc dng cng sut phn khng trn

ng dy cng khng thp ng c nhu cu viu chnh in p v cc l do khcnhau nh: n nh cc h thng, vn hnh phc tp v vn u t cao. Do phng

php iu chnh in p ca cc my bin p trong cc trm bin p c dng rng ri iu chnh in p.

Yu cu iu chnh in p c phn thnh 2 loi:

6.1 YU CU IU CHNH IN P THNG

in p yu cu trn thanh gp hp ca my bin p trong tnh trng vn hnh bnh

thng phi tho mn cc yu cu v lch in p trong cc ch:

- Ph ti cc i : Ucp max% 2,5%

- Ph ti cc tiu: Ucp min% 7,5%

- Ch s c : Ucp sc% - 2,5%

Vic iu chnh in p c tin hnh nh sau:

' '

max hdmmindc

ycmax yc min

U UUU .

U U 2

Trong :

'

maxU ,

'

minU l gi trquy i vpha cao p ca in p trn thanh gp hp

ca cc trm i vi ch ln nht v nh nht tng ng (c ly theo cc s liutnh ton ca in p.


72/83

n Mn Hc Mng Li in


ycmaxU , ycminU l gi trin p yu cu trn thanh gp hp ca trm trong cc

ch ph ti ln nht v nh nht.

hdmU in p nh mc ca cun dy hp ca cc my bin p.

Sau chn u iu chnh tiu chun ca my bin p, gn nht vi u iu chnh tnhton theo cng thc trn.

xc nh in p ca u iu chnh tiu chun c th s dng cng thc sau:

0 cdmtc cdm

n.E .UU U

100

Trong :

cdmU l in p nh mc ca cun dy in p cao.

N s th tu iu chnh chn.

0E mc iu chnh ca mi u (%)

0E =2,5%.

i vi cc my bin p khng c iu chnh in p di ti, u iu chnh khng thay

i trong tt ccc ch vn hnh ca mng in.

Sau khi chn u iu chnh tiu chun, cn tnh c cc gi tr thc ca in p trnthanh gp hp ca mi trm trong tt ccc chc trng ca mng in cng nhcc lch nhn c ca in p so vi in p nh mc ca cc thanh gp.

Cc in p thc trn thanh gp hp ca trm c xc nh theo cng thc tng qutsau:

'

i hdmit

tc

U .UU

U

Trong 'i

U l gi trquy i vpha in p cao ca in p trn thanh gp hp ca

trm bin p, tng ng vi cc ch ph ti ln nht, nh nht v ch sau s c.

lch in p trn thanh gp hp ca trm c tnh theo cng thc:

it dmi

dm

U UU % .100%

U

Chn u iu chnh in p theo cch trn thng c p dng i vi cc trm phnphi c yu cu iu chnh thng.

Trong ni dung n ta c ph ti 2 c yu cu iu chnh thng, trc ht ta xt iu

chnh thng i vi tt ccc ph ti v xt n iu kin lch in p cho php

xt s tha mn ca my bin p khng c iu p di ti.


73/83

n Mn Hc Mng Li in

do an mang luoi dien le hai nam

Documents