E] KHOA HQC CONG NGHE MOT SO VAN OE KY THOAT TRONG HdP Bd THI NGHliM Rd LE DA CHUfC NANG L i Duy Nhin Trudng Cao ddng Diin lUc Mien Trung Tom t i t Phdn Idn cdc hgp bd thi nghiim rale hiin nay dUoc th[.]
E] KHOA HQC - CONG NGHE MOT SO VAN OE KY THOAT TRONG HdP Bd THI NGHliM Rd LE DA CHUfC NANG L i Duy Nhin Trudng Cao ddng Diin lUc Mien Trung Tom t i t : Phdn Idn cdc hgp bd thi nghiim rale hiin dUoc thiit kidua trin viec sU dung cdc bien dp dien tU Chung cd Uu diem Id Idm viic tin cdy dd ben cao nhUng nhUdc diim ldn nhdt Id khdng the ddp Ung duac cac yiu cau thi nghiim c6 liin quan din tdn sd, gdc pha, sdng hdi Dendng cao khd ndng thi nghiem rd le vd nhdt Id tuddng hda cdng tdc thi nghiim, bdo cdo trinh bdy nguyin tdc thuc hiin hgp bd thi nghiim rale da chdc ndng vdi phdn diiu khien sUdung FPGA-Cyclone II-EP2C35-672C6 vd dsPIC30F4011 Viic sUdung FPGA vd dsPIC cho phip diiu khien song song nhiiu kinh ddng dien, diin dp boat ddng doc lap vepha, tdn so vd bien Ket qud thuc hiin cho thdy hgp bg thi nghiem ndy cd thi ddp Ung hdu hit cdc yeu cdu thU nghiem cua te ky thudt sd I.Gldl THIEU Thi nghiim b i o v i le ddng mdt vai tro r l t quan trpng d i n h g i l kha nang l l m viic eua d c bao v i rd le he thdng d i i n [3] Nguyen tac chung eua thi nghilm la dQa vao le cac dai iQpng ddng dien, d i i n ap, tan sd va gdc pha theo d c muc t i i u thi nghiim Cac muc t i i u ay thudc vao tQng loai b i o v i v l kha nang phat hien sQ ed cua chung Cle hdp bd thi nghiim le sQ dung bien dp d i l u chinh gap mdt sd bat Ipi thQc hiin d c thi nghiim co lien quan d i n tan sd, gdc pha Hon nQa d c hdp bp thi nghiem truyen thong khong cp kha ndng thi nghiim b i o ve tan sd va d c hang muc thi nghiim co liin quan d i n sdng hai [3] Hop bp thi nghiem le da chQc nang vdi t h i l t k l dQa tren n l n tang FPGA cho phep thQc hien nhieu phep thQlinh hoat hdn, ed the tich hop nhieu giai phap tQ dpng hoa cong t i c thi nghiem 1C I Dien Jk Ddi song SO D d K H | C U A HOP B O T H [ N G H I $ M R O L E Bien dp dieu chinh ed nhiem vu thay doi d i i n dp ngd khoang 0-250V xoay chilu v l dUdc dau ndi den cdc bd tao ddng d i i n hodc tao I p thi nghiim Mdt qud trinh thi nghiem dQpc thyc h i i n b l n g d c h dieu chinh ddng dien hoac d i l n I p d i n g i l tri mong mudn, sau ngdt dien va t i l n hanh dong dien trd lai ciing luc vdi viic khdi dpng k i n h thdi gian Thdi gian tie dong cua bdo v i dQpc tinh ke tQ ddng dien (vdi gia tri dat trQPc) cho d i n bao v i t i e ddng, Khdi thdi gian se gQi tin hilu n g I t nguon d i i n khdi mach bdo v i da t i c dong Ddt vdi cdc thi n g h i i m cd l i i n quan d i n gdc pha giQa hai ddng dien hole giQa dong d i l n va dien dp Viic tao gdc lech dQpc thyc h i i n thong qua thiet b\ dich pha hole b i l n I p dieu ehinh dupe d i u ndi tfieo d c sd dac b i i t [2] Bic n ap cliC-u chinh T^o dong ' Nguon cung cap - - • Tgoap » Ddi tugmg thi Nghiem Do thoi gian Hinh 1: Sd khdi cua hop bd thi nghiem rd le mot pha KHOA HOC - CONG NGHE Q HOP BdTHf NGHI|M ROLE DA CHUTC N A N G Nguon nghjch luu mpt pha Nguon nghich luu mpt pha Ddi tupng diQ Nguon nghich Imi mpt pha Nguon nghjch JLTU mdt pha Ngudn nghjch liru mpt pha Nguon nghich luu mpt pha Dieu khien pha, tan so, bien dp Do ludng dong, ap, cong suat Do thdi gian Ngudn cung cap Giao tiep ngudi dung Dong b6 thai gian T Hinh 2: Sd khoi hpp bo thi nghiem rd le da chQc nang Hop bd thi nghiem ro le da chQc nang sQ dung ngudn nghich iQu sdng sine viec tao tin hiiu thi nghiim Cle dai iQpng ddng, dp, tan sd va gdc pha dQpc dilu khiln va giam sat bang FPGA k i t hdp vdi vi d i l u khiln tin hiiu sd 15 bit cua Microchip - dsPIC30F4011 Hinh II so dd khoi cua hpp bd thi nghiem 3.1 Dieu khien nguon thi nghiem vdi FPGA 3.1.1 Nghich luu dieu chi rdng xung PWM Ky thudt dieu che dp rdng xung PWM ngdy cang dQpc md rpng utig dung tren nhilu linh vyc Mpt Qng dung cua ky thuat ndy la dilu khien thdi gian ddng md cap transistor chuyin mach theo mdt quy luat cho trQPc (chudi xung cd cung biin dp nhQng dp rdng khac nhau) [1] dQpc trinh bay nhQ hinh v l hinh Hinh 3: Nghjch lUu PWM mot pha Dien & Ddi songl \] E] KHOA HQC - CONG NGHE Sdng n o tfii M ^ / / ^ n • • - -'-'-"' 180P H i n h : D i i n d p cDa b d n g h j c h iQu Thuc hiin PWM trin FPGA Tin hieu hinh sin chuin 10 b i t d u a c l l y m l u tai 512 d i l m v l iQu t r y d c v a o b p nhd cua FPGA Viic truy xuat dQ liiu dupe thQe h i l n thdng qua b p d i m Itiy tuyin vdi bQdcnhlyldB DQIiiu ngo raid chudi Sine-PCMdQac dQa d i n bg dilu c h l d o rpng xung Tan sd cQa d i i n I p dQdc quylt djnh bdi tan sd clock dQa vdo bd cPng luy t u y i n (accumulator) De tao gdc pha bien doi, dQ lieu dQpc dQa vao bd cdng gdc pha sau dd mdi truy xuat vdo b l n g dQ liiu sine Dien ap ngd dQdc dieu ehinh bdng cdch thay doi h i so chia trQdc chuyen dQ lieu d i n bo PWM Hpp bd thi nghiem ro le can sQdung kinh ddng dien va d i i n dp doc lap dd sd dd tren hinh 3.4 thich hop thQc hiin t r i n FPGA PHASE REG EH ^-Dand2 AMPLITUDE_REG_EB —-:E Q(fiO) - UTApH) -:LK geieralor adder U!0 TO and2 FR[>CED generatorregS FREQ_REG CLKD- —DQ(eo| CLR[> DATA(8-0)DDATAF(6 0) [>- 18 I Dien Jk Ddi song gereratorjegS KHOA HQC - CONG NGHE Q Hinh 5: Gian muTc ghi Sine-PWM thac hien trenActive-HDL ~ • - - - - - - - , - - - "" ~ • - RMS cua cdc dai iQdng Analdg Vdi khd ndng xQ ly 30 MIPs v l tde dp lay mau 10 bit @ lOOOksps viic sQdung DSPIC trdng hop hpp bd thi nghiem cho phep thyc thi d e p h i p t o l n xQ ly tin h i i u d n thdi gian d i p Qng nhanh ' FPGA C>^;lone II ^ ^ ^ ^ 11 11 rinnnnnnn ^ ^ = ^ = ^ nrnnnnnr Hinh 6: Ket qud mo phdng dang sdng trdn Active-HDL 3.2 Do thdi gian tac dong Ket qud ki^m vd thii nghiim Thdi gian t i e dong cda b i o ve rd le dQpc thdng qua t i l p diem ngd eua rd le trung gian ThPi gian tde ddng dQpc tinh k l tQ tin hiiu vao rd le vQpt q u i ngQdng khdi ddng cho d i n tiep d i l m dPng lai Cau true bddothPi gian nhQtrin hinh Tiep diem Khoi dong Phat hioisiron tin hieu Hinh 9: Do lydng vd giao tiep sii dung DSPIC30F4011 l^y^ K^(\ ,A., -r.- -.'•