E] KHOA HQC • CdNG NGHf; long quan cp pifmm^h^r ^ DINH t i Sir C O I R E N DUDNG DAY/TRUYEN TAI DUA TREN TlN^HIED DD LfimiGYirHAI PHiA Nguyin Xuin T£ing, Nguyin DCTc Huy, Nguyin XuAn Hoing V l ^ Tdm t i t -./ _ Bdi bdo gidi thl$u t6ng quelk cdc phudngpimp dfnh vf sifdi trin di/dng ddy truyin tdi, nhiin chi gidi h^n vdi cdc phiMng phdp aSr di/ng tfn hl^u So ludng tit hal Mu Cdc tin M4u ludng ndy cd titfdd^ ddng b^ hda thdng qua hf thSng GK ho^c khdng dupic ddng b^ Phdn Clttg d\mg cda cdc thu^ todn ndy gidi thlfu kit qud md phdng 061 vdi m^t tuyin dUlfng ddy 220 kV Gidi thi6u Chung Cic dudng d i y truyin t i i thudng cd chilu d i i Idn v i ddi dl qua cac vung dia hinh ddi nui phdc tap, dieu niy g i y nhilu khd khin cho cdng t i c tim i ^ l m sU cd Do viy, vi^e tfnh t o i n djnh vi chinh xic d i l m sued tren dUdng d i y cd y nghia r i t Idn, rut g i i m bdt d i n g ke n h i n cdng, v i t lUc Cic dudng d i y truyen t i i vdi cap dien i p t d 220 kV trd len thudng dupc trang bi cic b i o v§ chfnh l i chde ning b i o ve khoing eich va b i o ve so lech dpe (nlu cd dudng truyen b i n g thdng rdng) Thuc te cho thay, chde nang djnh vj su cd cac rdle khoing each b i o vi tri vdi mdt mde dd sai sd tUong ddi Idn Cie role so l&ch dpe hien dai da dupe tich hpp them chde ning djnh vi sU cd v i cd ning lam viec vdi dp chfnh xic cao hdn, dieu niy la hoin t o i n thue t l vl eie rdle loai n i y thudng sd dyng nguyen ly dinh vj sU cd dUa tren tfn hieu ludng t d hai dau dudng diy Bii b i o n i y se gidi thi^u, lam rd cac nguyen ly eo b i n d l djnh vj sU cd dua tren tin hieu ludng t d hai dau dudng day Ndi dung ly thuyet lien quan den djnh vj sU cd dUa tren cie tin hieu ludng ddng bd dupe trinh biy d muc va tiep theo myc 14 I Dien & D&i song gidi thi$u cic v i n d l c i n xd 1^ tfn hi^u ludng khdng ddng bO- Myc se gidi t h i | u cic k i t q u i tfnh t o i n md phdng d l chdng minh tfnh k h i thi ciia t h u i t t o i n Dinh vi SU cd dUa tr6n tin hieu Itfdng tfdng b6 Cic phuong p h i p dinh vj si/cd dua tren tfn hi^u ludng ddng bO cd t h i Sd lupc p h i n loai theo: • Sd dyng cie tin hi|u ddng v i iptaitinsdcdbin{50Hzi • Sd dyng tin hi^u sdng Ian truyin (traveling-wave) t i n sd cao Phuong p h i p sd dung tin hieu sdng Ian truyin, cho tdi thdi d i l m h i i n tai, dupc d i n h g i i l i phUdng p h i p ed chfnh xic cao (sai sd cd the chi pham vi mdt khoing cdt, khoing 300 m), nhlfin phuong p h i p n i y ddi hdi p h i i dau t u cic t h i l t bj chuyen diing {cie t h i l t bj xung ddng v i i p , cic p h i n m I m xd ly tin h i i u ri^ng ) Chinh vl cic han e h l n i u trdn nen phUdng p h i p chUa dupe trien khai rOng rai, do se khdng gidi thieu chi t i l t bai b i o niy 2.1 Gidi t h i ^ u v l t h i l t bj GPS Tin hi^u ludng tai hai d i u dudng d i y cd t h i duoc ddng bd v l m i t thdi gian n l u cic tram dupc trang bj ddng hd thM gian ti/ ddng bd thdng qua tin hieu GPS He thdng GPS bao gdm nhilu v$ tinh (khoing 30 v$ tinh v i o thdi d i l m n i m 2007 [1 ]), c i c v^ tinh d i u dUpc trang bj cic ddng hd chinh xic cao vdi sai so cd ±0,5 MS- N l u qui ddi gdc dO dien thi sai sd n i y tUdng dUdng vd^ chi ±0,009° mdt chu ky 360° 2.2 OInh vi si/ c6 dUa trin tfn hi6u sdng Ian truyin Khi S I ; cd x i y tai mdt dilm t r i n dudng d i y t i i dien, se giy cic dot b i l n v l ddng va i p Cic sdng ddng, i p ddt b i l n se Ian truyen trSn dudng d i y c i v l hai phfa vdi tdc dd Ian t r u y i n sdng xap xi tdc dd i n h sing Khi sdng Ian truyin di tdi mot d i u dudng d i y se gap d i l u kien bi^n thay ddi (thay ddi eiia tong trd), d6 mot p h i n cda sdng n i y se phin xa trd lai v i mdt p h i n tiep tyc Ian tmyln di t i l p Sd bleu dien qua trinh phin xa, khue xa eQa cic sdng Ian truyin t h i hien tren Hinh DUa theo chinh l^ch thdi gian gida tfn hieu thu di/dc tai hai d i u (At) h o i n t o i n cd t h i xic djnh dupc vi trf diem sd ed bing phUdng trinh (2.1) KHOA HQC - CONG NGHE; x= hi^n.Tuy nhiin, cic t h u i t t o i n n i y khdng t h i cho k i t q u i chinh x i c b i n g phUdng p h i p sddyng sdng Ian truyin l-c*M Q (2.1) Trong dd: x: khoing eich d i n d i l m sy cd /: tdng chilu d i i dUdng d i y c v i n tdc i n h sing {299,792 m/s) D i e d i l m cCia phuong p h i p niy: • Phii ed cic thilt bj ghi tfn hiiu dupe ddng b^ thdi gian vdi dd chfnh xic cao, ehl mdt sy sai l^eh r i t nhd v l thdl gian cd the d i n tdi sai sd Idn v l khoing eich tfnh dUdc • Phan m I m phii ed k h i ning ddng bo hda tfn hidu, loc nhieu v i trich x u i t tfn hi&u mong mudn Die biet vdi cac SU cd g i y s^t cd the g i y c i c nhieu dien t d i n h hudng d i n dd chinh x i c eua ph^p Ipc tfn hiiu TCiy theo sd lupng tin hi§u ludng sin cd m i t h u i t t o i n cd t h i chia ra: • Djnh vj sy cd dya tr&n tfn hi&u ludng d i y du t d hai d i u {do ludng d i y du ch ddng di^n v i di&n i p ) • Djnh vj SU cd dua tr&n tin hi&u ludng khdng d i y du t d hai d i u (tin hi&u ludng t d mdt d i u cd t h i chi liddngdi&n hoicdi&nip ) • Ngoii cung ed t h i phin loai t h i m theo vi&c t h u i t t o i n ed c i n sCf dung d i n sd liiu v l tdng trd eua dudng d i y hay khdng Thuat toan dUdc gidi thi&u chi t i l t b i i b i o l i dya tr&n thdng tin ludng d i y dii t d hai phfa dudng diy, cac trudng hpp edn lai sd dyng eich suy luin gan tUdng t u Mdt sd nghien cdu khic cung da d l xuat tdi vi&c sd dyng tin hi&u p h i n xa gida hai l i n liin t i l p tai mdt d i u X&t sU cd x i y tai d i l m F, each tram A mdt khoing la X {%) tren dudng d i y AB nhU Hinh dudng d i y vdi nguy&n ly tinh t o i n hoin t o i n tuong tu Tr?mA A / B G>- * -Lfe-