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KHO ST CHT LNG CA H TRUYN NG C KHE H

IU KHIN BM LI H THNG PHT IN SC GI S DNG MY PHT KHNG NG B NGUN KP BNG PHNG PHP IU KHIN TA THEO TH NG

GRID RETAINING CONTROL OF WIND POWER PLANTS SYSTEM USING DOUBLY-FED INDUCTION GENERATORS BY PASSIVITY -BASED METHODng Danh HongTrng i hc K thut Cng nghip Thi NguynTM TTVic kho st, nh gi cht lng phng php iu khin cho h thng my pht in sc gi s dng my in khng ng b ngun kp c mt ngha ht sc quan trng.

Bi bo trnh by kt qu nghin cu p dng phng php thit k b iu khin phi tuyn ta theo th ng (passivity based) iu khin my pht in khng ng b ngun kp, m bo bm li khi xy ra li li i xng xa gy sp mt phn in p li.

T kho: iu khin ta theo th ng, sc gi, li li.ABSTRACT

The surveying and evaluation of the quality of control method for wind power systems using Doubly-Fed Induction Generators (DFIG) is a highly important signification.

A new designing methodology for the passivity-based nonlinear controller is applied to gain some results which are described in this paper as can be seen, to control the Doubly-Fed Induction Generators, to maintain grid retaining of system in syschronical fault case which lead to drop a part of grid voltage Key word: Passivity - based control , wind power, grid fault.K hiu

K hiun v ngha

LrHin cm ca rotor

Tr, Tsshng s thi gian rotor v stator

(r, (rad/svn tc gc rotor, vn tc gc c hc rotor

(sd, (sqWbthnh phn d v q ca t thng stator

(rd, (rqWbthnh phn d v q ca t thng rotor

(h s tn tng

LmHin cm h cm gia stator v rotor

Ch vit tt

DFIGmy pht in khng ng b ngun kp

PSGPht in sc gi

ELEuler - Lagrange

PBCiu khin th ng

NLNng lng

TSPKhu tnh ton gi tr t

GTTKhu tnh ton gi tr thc

PLLVng kho pha

1. M uTrong thi gian gn y nc ta, cng nh trn th gii vic iu khin my pht in khng ng b ngun kp trong h thng my pht in sc gi (PSG) ang l mt vn c quan tm. Hin nay c mt s tc gi s dng cc phng php iu khin nh tuyn tnh ho chnh xc[9], backstepping[1] v c nhng kt qu nht nh. Bn cnh tc gi cng c mt s cng trnh nghin cu [2, 3]. Bi bo ny a ra kt qu nghin cu phng php iu khin passivity based iu khin my pht in khng ng b ngun kp trong trng hp li li, c th:

iu khin m bo h thng my pht in sc gi s dng my pht khng ng b 3 pha ngun kp bm li khi xy ra li li i xng xa gy sp mt phn in p li nhm trnh r li nu cc my pht in sc gi ng lot ct ra khi li.

Trong tng lai c th hnh thnh h thng gm rt nhiu cc my pht in sc gi, v vy khi xy ra li li m tt c cc my pht u ct ra khi li th rt d xy ra hin tng r li. Do vic iu khin m bo bm li khi xy ra li li l ht sc quan trng. Trong nghin cu ny tp trung vo vic gii quyt vn trn. 2. Phng php iu khin ta theo th ng2.1. C s l lun ca phng php iu khinPhng php iu khin ta theo th ng (Passivity Based Control - PBC) l thut ton iu khin m nguyn l ca n da trn c im th ng ca i tng (h h) vi mc tiu lm cho h kn cng l mt h th ng vi hm lu gi nng lng mong mun.

Xt mt h c k hiu l ( c hm tng lu gi nng lng (xc nh dng), vector iu khin u vo u, u ra y v coi nh h khng chu tc ng ca nhiu. Nh vy tc cung cp nng lng cho h s l yTu. H trn c gi l th ng nu [11]:

(1)vi x = (x1,x2,..,xn)T v l vector trng thi v o hm vector trng thi ca h thng.

iu c ngha l (: u ( y xc nh mt quan h th ng bng hm lu gi tng nng lng .Nu u = 0 th , nng lng ca h khng tng, v vy h s n nh Lyapunov, lc ny gi vai tr nh hm Lyapunov.

Nu h l th ng cht th s n nh tim cn Lyapunov ti gc to v xc nh m.

2.2. Cu trc h thng iu khin

Theo [2, 4, 6], h thng gm 2 phn iu khin c bn nh hnh 1.

iu khin pha my pht s dng my in khng ng b ngun kp (Doubly -fed induction machines - DFIG).

iu khin pha li.

NLPL:Nghch lu pha li,

NLMP: Nghch lu pha my pht,

MC:My ng ct,

IE: Thit b o tc .

2.3. p dng phng php thit k b iu khin

2.3.1. Thit k b iu khin dng in rto pha my pht

p dng phng php ta tch h thng pha rotor my pht in thnh hai phn ng hc phn in (hm nng lng ) v ng hc phn c (hm nng lng ) - Hnh 2.

Vi: (: l v tr gc c hc ca rotor. l ma trn qun tnh in t. J l m men qun tnh.Sau p dng cc phng trnh ng hc ca my pht vo phng trnh EL, h tr thnh th ng [3, 11].T hnh 2, ta xy dng s nguyn l cu trc iu khin theo phng php ta theo th ng nh hnh 3. Ta c th c th ho bng hnh 4.

p dng phng php thit k l a b iu khin vo h ng hc phn in vi tng tc ca h ng hc phn c, sao cho h kn tho mn l th ng theo phng trnh EL, ta c [2, 3]:

(2)

D(() l hm suy gim a h tr thnh th ng cht (n nh tim cn Lyapunov): (3)

Nh trong [1, 4] h phng trnh m t m hnh dng rotor ca (DFIG) sau khi c tch ra trn h trc to dq nh sau:

(4)

t bi ton iu khin ta t bin ir l bin iu khin, vi gi tr mong mun l ir* c ly t b iu chnh m men mG v cos(. B iu khin ta theo th ng EL c xy dng theo nguyn tc (2). Tn hiu iu khin c xc nh: (5)

Trong :

l in p do b iu khin PBC to ra ( theo d v q).

urd*; urq*: in p rotor mong mun ca my pht (theo d v q) c xc nh theo (4).

Vi phng php trn ta c b iu khin dng in rotor theo 2 thnh phn:

(6)

(7)

vi ;

T cc b iu chnh dng ta theo th ng ta thy n m bo tch knh nh b lin kt ngang bi 2 thnh phn (r.ird* v (r.irq* v b c cc thng s khc nh in p li, t thng stator, tc ca rotor v c thnh phn tch phn kh sai lch tnh. T (6), (7) v hnh 4, ta c th ho bng cu trc iu khin tng th ton h thng nh hnh 5.2.3.2. Thit k b iu khin pha li

Do yu cu ca pha li ch l iu khin n nh in p uDC cung cp cho mch mt chiu trung gian gia 2 NLPL v NLMP. V vy trong ni dung bi bo ny, tc gi cng chn phng php thit k tuyn tnh Dead Beat thng thng c s dng trong cc ti liu [1, 3, 4].

2.3.3. S v kt qu m phng bng Matlab Simulink PlecsM phng vi my pht c thng s:

Pm = 1,1 KWUmr = 345 VRr = 3.7 (

Ums =220/380((/()nm =950 V/phL(s = 0.013H

fm = 50 HzRs =4.2 (L(s = 0.0089H

zp = 3Cos(m =0.657Lm = 0,34H

J = 0.064Kgm2Im = 3,5AM hiu: VM Vit Nam

iu khin bm li th h thng iu khin phi m bo iu khin gi m men bng 0 v pht cng sut phn khng ln li thng qua cos( nhm h tr v mt in p. lm c iu trn th b iu khin dng ng mt vai tr quyt nh cho cht lng bm li ca h thng.

Trng hp in p b sp (i xng) gim 10%, n = nm = 950v/ph; Thc hin iu khin m men c bc nhy t m = -3Nm v 0Nm v cos( nhy t cos( = 0.7 v 0.436 (sin( = 0.9) bm li:

Trng hp in p b sp (i xng) gim 50%, n = nm = 950v/ph; Thc hin iu khin m men c bc nhy t m = -5Nm v 0Nm v cos( nhy t cos( = 0.7 v 0.436 (sin( = 0.9) bm li:

3. Kt lun

- Bi bo a ra c thut ton iu khin m bo h n nh tim cn Lyapunov ti gc to .

- Kt qu m phng cho thy b iu chnh dng rotor iu khin cc thnh phn ird, irq bm tt gi tr t ird*, irq* khi li b s c sp li (i xng) gy st p t 10% n 50% in p li v tn s gc mch rotor khi c tham gia ca b iu chnh dng PBC b dao ng sau vn lm vic n nh, sau khi ht s c h thng tr v trng thi lm vic n nh (hnh 7, 8, 9, 11, 12, 13, 14). Vi kt qu m phng cho thy tnh bn vng ca b iu chnh PBC khi xy ra li li st p trong phm vi 10% n 50% v cht lng iu khin ca h thng c m bo.

- Trng hp li b s c sp li (i xng) gy st p ln hn 50% th cht lng iu khin ca h thng khng c m bo v c th b mt iu khin.

Ti liu tham khoCao Xun Tuyn: "Tng hp cc thut ton phi tuyn trn c s phng php backstepping iu khin my in d b ngun kp trong h thng my pht in sc gi", Lun n tin s k thut, i hc Bch khoa H ni, 2008.

ng Danh Hong: "Ho ng b my pht in ln li bng phng php iu khin passivitybased", Tp ch KHCN i hc Thi nguyn, 2010

ng Danh Hong, Nguyn Phng Quang, "Thit k b iu khin da trn th ng "Passivity - based" iu khin my pht in khng ng b ngun kp", Tp ch KHCN cc trng i hc k thut, s 76, nm 2010.

Ng.Ph.Quang, A. Dittrich (2008) Vector Control of Three - Phase AC Machines - System Development in the Practice. Springer Heidelberg Berlin..

Ng.Ph.Quang: Matlab ( Simulink dnh cho k s iu khin t ng. NXB KH v KT, H ni, 2004.

Ng.Ph.Quang: iu khin t ng truyn ng in xoay chiu ba pha. NXB GD, H ni, 1996.

N.D.Phc, P.X.Minh, H.T.Trung: L thuyt iu khin phi tuyn. NXB KH v KT, H ni, 2003.

Arnau D`oria-Cerezo, "Modeling, simulation and control of a doubly-fed induction machine controlled by a back-to-back converter" PhD Thesis, 2006.

Lan, Ph.Ng: "Linear and nonlinear control approach of doubly - fed induction generator in wind power generation", P.h.D thesis, TU-Dresden, 2006.

Levent U.gdere, Marwan A. Simaan, Charles W. Brice: Passivity Based Control of Saturated Induction Motors, 1997, IEEE.

R.Ortega, A.Loria, P.J.Nicklasson, H.Sira-Ramrez: Passivity-based Control of Euler Lagrange Systems: Mechanical, Electrical and Electromechanical Applications. Springer-Verlay, London-Berlin-Heidelberg, 1998.

mG

mW

(sc gi)

(-)

(-)

(-)

EMBED Equation.DSMT4


(A)

(s)

Hnh 13. Cosphi khi sp li 50%


Hnh 2. Phn tch DFIG thnh ng hc phn in v phn c

urPBC

(-)

-

(

mW

mM

ir

Hm

He

3~

=

Hnh 1. S cu trc h thng my pht in s dng DFIG [4]

NLMP

NLPL

iN

n

is

ir

UDC

DFIG

us

uN

MC

IE

Thit b iu khin

=

3~

3~

Bin p

(




EMBED Equation.DSMT4 : B iu chnh dng theo phng php PBC

Hnh 3. S nguyn l cu trc iu khin MKBNK theo phng php PBC

MKBNK

(-)

(-)



(-)

mW

(sc gi)

mG

(



Tnh ur* trn c s hm NL mong mun He*

Tnh h s suy gim D(()

us

(r

(s

(-)



B iu chnh EMBED Equation.DSMT4



Hnh 4. Cu trc b iu chnh vc t dng PBC bao gm 2 khi chc nng

iu khin pha my pht

iu khin pha li

Hnh 10. Dng rotor khi sp li 10%

Hnh 5. H thng iu khin my pht DFIG trong h thng PSG s dng b iu chnh Passivity - Based

Hnh 6. S m phng h thng my pht in sc gi s dng DFIG

(Nm)

Hnh 7. in p li khi sp li 10%

(s)

(s)

Hnh 8. M men khi sp li 10%

(s)

Hnh 9. Cosphi khi sp li 10%

(A)

(s)

Hnh 14. Dng rotor khi sp li 50%

(s)

Hnh 11. in p li khi sp li 50%

(Nm)

(s)

Hnh 12. M men khi sp li 50%

(s)

PAGE 2

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_1318211032.unknown

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