Tran Minh Dire vd Dtg Tgp chi KHOA HOC & CONG NGHE 102(02)'''' L37 144 NGHIEN C i r u BO LOC LCL CHO BO BIEN DOI NOl LUOI Tran Minh Diic'''' , Le Tien Phong'''', Doan Kim TuAn" ''''irudng ( (H) Jang nghe Lilamal,[.]
Tran Minh Dire vd Dtg Tgp chi KHOA HOC & CONG NGHE 102(02)' L37- 144 NGHIEN C i r u BO L O C LCL C H O BO BIEN DOI NOl LUOI Tran Minh Diic' , Le Tien Phong', Doan Kim TuAn" 'irudng ( (H) Jang nghe Lilamal, 'Trudng Dgi hoc Ky thual Cihii: nghiep - 1)11 Vu'u X^iiven TOM TAT Trong xu the phat trien c se anil hudng rai Idn den hieu sual ciia he Ihdng Thay \\ sir dung dien trd thuc ihi d day sir dung dien trd ao lam giam dao ddng nhung khdng ga\ nen tdn thdt [6].[7],[8],[9], Mach dien luong duong mdt pha cho d hinh Theo [61 cd bdn \ j Iri dien trd ao lien quan den md hinh, luo'ng lu nhu dao ddng lat dan llui ddng (hinh 3) Ngudn ddng i, trinh bay cac phan eo ban cua ddng pha nghich luu ngudn ap \ a gia su rang cd cimg vdi ddng dien tham ehieu Irong bd dieu khien vdng lap Ngoai \^ la pha dien ap ludi 0' Hinh Dd ihi bode cua bd loc LCL thu donga) dien ti a not liep vin cuon cam, h) dien tra nidc song Hong vin cudn cam , c) dien tra ndt tiep vin lu d) dien tra song song v&i tu 138 102(02): 137- 144 L-i8-[£-»-[iH Hinh a) Mach tuang dirong xoay chieu mgl pha cua bd nghich luu b) Mo phong cdu inic diiu kliien Tren hinh a), dien trd dugc ndi tiep vdi cudn Ige cd vai trd lam giam dien ap tren Tran Minh Dire vd Dig Tap ehi KHOA HOC & CONG NGHE cudn cam Trong vdng lap dieu khiln, ddng dien qua cudn loe dugc va xac dinh bdi hang sd sCfR| Tuy nhien, gia tri dien trd thuc thi khdng dugc sir dung [6], [7] Trong thuc ll, cac dien trd ao cd the dugc su dung nhicu hon eiing mdt thdi diem Neu dien trd ao duge ndi ndi tiep \di bd Ige lu dien hay bd Ipc cudn cam se thein vao bd cam bien ddng va mdt mach vi phan Mach vi phan ed the sinh eac nhieu lin hieu d tan sd cao Neu dien trd ao dugc ndi song song vdi tu dien hoae cudn cam liic bd dieu khien se dugc them vao bd cam bien dien ap va bd khuech dai Hinh 7, so sanh ciia dd thi bode he thdng khdng cd sir dung bo dao ddng lat dan va he ihdng cd su duna bd dao ddng lai dan dung dien trd ao ndi tiep \ di tu Igc 102(02) 137- 144 Bg bii lead dugc them vao pha duong cua he thdng Bd bii can dugc dieu chinh tan sd cgng hudng vdi bd Igc [8] Hinh 8, cho thay dd tin bode khdng su dung hp thdng dao ddng tat dan ciia bd bii lead va he thdng su dung bd dao ddng lat dan dung bd bii lead-lag Phuong phap boat ddng cua bd bii lead-lag dugc md la Irong [10], Phuang phap dimg cac phiin lu lead - lag de ddng bd vdi dien ap dien ap phan hdi ciia lu dien, hinh Hinh 8, Dd ihi bode cua hi ihdng dao ddng tal ddn dimg bo bii lead-lag ^ Hinh Sa khdi cua bd dteu khiin Khi he thong khdng sir dung dao dgng til dan Hinh He thdng diiu khiin phan hdi lead-lag T H I E T KE BO LOC LCL NOI LU'Ol Mach Igc LCL lao su each ly giua trd khang cua bg Igc vdi ludi va dp gon ddng dien qua cudn cam ludi dien eung thap [13] Md la cau triic he tren hinh 10, dac linh loc a) b) tren hinh 11 va so dd thay the mdi pha the Hinh 7: So sdnh cua dd thi bode hai inrdng hop a) khdng su dung bd dao dgng tdt ddn b) cd hien tren hinh 12 sir dung bg dao ddng lat ddn Bo bii lead-lag Dd djch chuyin gdc pha dugc thuc hien bd bii lead-lag [10], [8] Bd bii lead-lag duge md ta thdngquaf phuong trinh: = C(T.s- Hinh 10 Mach loc LCL Tran Minh Di'ic i Dig Tap chl KHOA HQC & CONG NGH$ 102(02): 137- 144 H„, =- (6) Dc tinh toiiii ham iruyen eiia bd Igc, la sir dung mgl sd cac Ihual toan Gia su rang dien iip ki'di dirge ly ludng la dien ap ngudn Ngan mach dau cho v^, = Tir phuang trinh (5) \ i i (6) la \ i e l lai nhu sau 'M *ô.)='.('?ã"/"') llillh 11, /',' thi '""^^' '•"" '"