Đang tải... (xem toàn văn)
Dang Thi Loan Pugng Tap chi KHOA HQC & CONG NGHE 86(10) 207 21 NANG CAO K H A NANG L A M VIEC ON DINH CUA M A Y P H A T DIEN SlTC GIO v o l L U O I TRONG TRUOTVG HOP LUOl DOI XtTNG BANG PHUOTSG P H A[.]
Dang Thi Loan Pugng Tap chi KHOA HQC & CONG NGHE 86(10): 207-21 NANG CAO K H A NANG L A M VIEC ON DINH CUA M A Y P H A T DIEN SlTC GIO v o l L U O I TRONG TRUOTVG HOP LUOl DOI XtTNG BANG PHUOTSG P H A P B A C K S T E P P I N G Dang Thj Loan Phu'ong Tnrdng DH Cong nghe Thong lin vd Truyen thong - DH Thdi Nguyen TOM TAT May phat dien sire gid sir dung dong ca khdng dong bo rd to Idng sdc vdi stato dugc ndi true tiep vdi ludi dien cdn roto dugc ndi ludi thdng qua bp bien ddi Viec dieu khien cac thong so cua may phat de chimg lam viec hda hgp vdi ludi deu nam mach roto mach roto cd cdng suat nhd hon nen nen cdng suat he dieu khien cung nhd dan den gia ciia he thdng cung giam dang ke Viec nghien cii'u, thiet ke cac bo dieu khien nham dam bao cho may phat lam viec dn dinh vdi ludi la van dl cd tinh thdi su, dang thu hut su chu y ciia cac nha khoa hoc va ngoai nudc Trong bai bao tac gia de xuat sti' dung phuong phap Bacstepping de thiet ke bp dieu khien nham nang cao kha nang lam viec dn djnh ciia may phat vdi ludi Cac ket qua md phdng cho thay he thdng da dap Ling yeu cau ky thuat dat va cd tinh kha thi ap dung thuc te Til' khoa: On dinh, phirang phdp Backstepping, md)-phdt dien sire gio, dien dp ludi ludi ddi xirng DAT VAN DE May phat dien siic gid dugc sir dung la may dien khdng ddng bd rd to day quan (MDKDB)[1] Loai may duge irng dung cang nhieu vao cac he thdng may phat dien ndi chung va dac biet cac he thdng may phat dien chay sue gid ndi rieng Cdng suat ciia may phat nam dai dieu chinh tir vai chuc kW din tren MW va cd nhung uu diem ndi bat; nhiem vu dieu khien cdng suat hiru cdng va cdng suat vd cdng lai cd mdi quan he phi tuyen phii thudc lan Trudc day ngud'i ta giai quyet van de bang viec coi tan sd mach rotor bang hang sd mdt khoang thdi gian trich mau, tuyen tinh hda md hinh he thong va tach kenh cac phan dong Tuy nhien phuong phap lai gap phai mdt khd khan ldn tan sd mach rotor bien thien tdc gid thay ddi, dac biet la trudng hgp ludi dien gap su cd dan tdi sap ludi, thi ngoai su biin thien manh ciia tan so mach rotor, ciia tdc may phat, cdn phai ke den su dao dgng cua tir thdng, dien ap ludi Nhung dac diim ke tren da lam cho phuong phap dieu khiln tuyIn tinh giam hieu luc Trong bai bao tdi da dimg phuong phcip • Td: 0944 899009, danglhtloaiiphuong468!cr,gmail.com Backstepping de nang cao kha nang dn dinh ciia he thdng may phat dien sire gid vdi ludi trudng hgp ludi ddi xirng DIEU KIEN HOA DONG B Q VCil LUOI DIEN, vA SO DO TONG Q U A T CUA HE THONG [2,3] Cac dieu Icien de hoa dong bo nguon dien ciia may phat dien sire gio voi lu'oi dien quoc gia De hda ddng bd may phat vao lirdi, phai thda man ddng thai ba dieu kien sau : - Dien ap may phat va ludi cd ciing tan sd - Dien ap may phat va ludi cd cung trj sd - Dien ap may phat va ludi cd cimg gdc pha D I thuc hien viec hoa ddng bd may phat vao ludi, ta chi can tinh chgn cac gia trj dat cho cac phan ddng dien rotor, xac djnh gdc chuyin ddi phii hgp de thuc hien eac dieu kien boa ddng bd S c he thong - Bo dong cat mem; Nhiem vu; Ddng cat mach dien de cho mgt thiet bj dugc ket ndi hoac khdng Cau tao: Mdi pha gdm hai Thyrisor mac song song ngugc 207 Ddng Thi Loan Phugng Tap chi KHOA HOC & CONG NGHE 86(10): 207-211 dl tdng hgp bd dieu khien dong Sa dd cau true dilu khien phia may phat dd khau dieu chinh dong dugc thiet ke theo phuong phap phi tuyen Backstepping dugc chi d hinh Ngi dung ciia phan tdng hgp bg dieu chinh ddng phia may phat bao gom cac cdng viec chinh sau: NLPL NLMP MDN HS MP IE Nghich liAj phia JLTdi Nghich ILAJ phia may phat May dong ngat Hop so May phat May khSc vach xung Hinh \ So' dd cau triic he thdng phat dien chay sue gid sir dung MDKDB Dac diem; Cho phep ddng cat vdi thai gian ngan, thdng qua thuat toan dieu khien, cho phep dieu khien dugc cdng suat cap cho tai va hudng truyen cdng suat - Bg nghich luu phia may phat (NLF) va nghjch luu phia ludi (NL) Nhiem vu; Bien ddi dien ap xoay chieu ba pha dien ap mdt chieu dugc luu tren bg tu dien hoac bg ac quy, hoac ngugc lai Ve mat nang lugng ddng nang lugng cd the chuyen qua be) nghich luu theo hai chieu hoan tra nang lugng tir mach mot Tdng hgp khau dieu chinh ddng Backstepping ca ban phia may phat: bao gdm tdng hgp cac khau dieu chinh phan /,,/ va /,.,/ tren mien lien tuc, sau so boa bg dieu chinh ddng de cd the thuc hien viec cai dat bg dieu chinh tren he thdng xii' ly tin hieu sd DSP Qua bo dieu chinh ddng ca ban, ta se thay dugc bo dieu chinh da thuc hien dugc viec tach kenh thdng qua bii cac phan lien ket ngang co^.i^.j va a>,./, , viec bii true tiep dien ap ludi (dien ap stator), bit tir thdng stator, bii tdc rotor may phat Tuy nhien, bd dieu chinh ddng chua cd phan tich phan, nen se tdn tai sai lech tmh Khac phuc sai lech ddng Backstepping phan tich phan, nen dua phan tich thuat Backstepping tmh; bg dieu chinh co' ban chua cd de khir sai lech tTnh ta phan vao tren co' sd ky P H A T [4] Tdng hgp bg dieu chinh ben vting thich nghi Backstepping phia may phat: muc dich la de bg dieu chinh ben vung vdi cac Ta nhan thay de nang cao dugc chat lugng dieu khien ciia he thdng PDSG, ta can tap trung nang cao chat lugng ciia bg dieu chinh ddng phia may phat, bang each ap dung phuong phap thiet ke phi tuyen backstepping dao dgng phi tuyen Idi ludi nhu dao ddng cua til' thdng stator, dao dgng ciia dien ap ludi, dao dgng cua toe may phat va tan sd gdc mach rotor Nang cao dugc tinh dn djnh cua he thdng may phat dien sue gid AP DUNG PHUONG P H A P BACKSTEPPING TRONG THIET KE DIEU KHIEN PHIA MAY Hinh CSu tnic dieu chinh may phcit he thong phat dien chay sire gid s u dung MDKDB cd su dung khau dilu chinh Backstepping 208 Ddng Thi Loan Pugng Tap chi KHOA HOC & CONG NGHE 86(10): 207-21 I Tong hop khau dieu chinh dong Backstepping co' ban phia may phat [5] cdng suat vd cdng thdng qua khau tinh toan gia trj dat TSP Ggi sai lech giiia /,,, va gia trj Tdng hgp khdu dieu chinh thdnh phdn t,.j triin mien lien tuc d a t /,-,, la ; Chon /,,/ la bien dieu khien, gia trj mong mudn ciia nd /',