Txhawm rau txo cov pa phem tam sim no los ntawm lub tshuab hluav taws xob nruab nrab, Tuam Tshoj tau siv ntau lub tshuab hluav taws xob hloov hluav taws xob, thiab tsim ntau yam khoom siv hluav taws xob nruab nrab xws li 6-pulse, 12-pulse, thiab 24-pulse intermediate zaus furnaces, tab sis vim hais tias tus nqi ntawm cov tom kawg yog qhov siab siab, ntau lub tuam txhab hlau ua cov hlau tseem melting hlau cov ntaub ntawv nyob rau hauv 6-pulse intermediate zaus furnaces, thiab cov teeb meem ntawm mem tes tam sim no ib puag ncig muaj kuab paug tsis tau ignored.Tam sim no, feem ntau yog ob hom kev tswj hwm rau cov zaus cua sov sib haum xeeb: ib qho yog txoj kev tswj hwm kev pab cuam, uas yog ib txoj hauv kev kom tshem tawm cov teeb meem kev sib raug zoo tam sim no, thiab yog kev tiv thaiv kev tiv thaiv kom tsis txhob muaj kev sib haum xeeb ntawm nruab nrab. zaus induction furnaces.Txawm hais tias txoj kev thib ob tuaj yeem cuam tshuam nrog qhov teeb meem loj zuj zus ntawm kev sib haum xeeb ib puag ncig hauv ntau txoj hauv kev, rau qhov nruab nrab zaus induction furnaces tam sim no siv, tsuas yog thawj txoj kev tuaj yeem siv los them nyiaj rau qhov tshwm sim harmonics.Daim ntawv no tham txog lub hauv paus ntsiab lus ntawm IF lub cub tawg thiab nws cov kev tswj hwm kev sib haum xeeb, thiab tau tshaj tawm lub zog lim dej (APF) kom them thiab tswj cov kev sib haum xeeb hauv ntau theem ntawm 6-pulse IF rauv.
Hluav taws xob txoj cai ntawm nruab nrab zaus rauv.
Lub tshuab hluav taws xob nruab nrab yog lub tshuab cua kub ceev thiab ruaj khov, thiab nws cov khoom siv tseem ceeb yog qhov nruab nrab zaus hluav taws xob.Lub zog hluav taws xob ntawm qhov nruab nrab zaus qhov cub feem ntau siv AC-DC-AC hloov pauv txoj kev, thiab cov khoom siv hluav taws xob hloov pauv tam sim no yog cov khoom tso tawm raws li qhov nruab nrab zaus hloov tam sim no, thiab qhov hloov zaus tsis txwv los ntawm qhov zaus ntawm daim phiaj hluav taws xob.Daim duab thaiv Circuit Court yog qhia hauv daim duab 1:
Nyob rau hauv daim duab 1, lub luag haujlwm tseem ceeb ntawm ib feem ntawm lub inverter Circuit Court yog hloov pauv peb-theem kev lag luam AC tam sim no ntawm lub zog xa hluav taws xob thiab xa khoom xa mus rau hauv AC tam sim no, suav nrog cov khoom siv hluav taws xob hluav taws xob ntawm lub zog xa hluav taws xob thiab kev xa tawm, tus choj rectifier. Circuit Court, lim Circuit Court thiab rectifier tswj Circuit Court.Lub luag haujlwm tseem ceeb ntawm qhov inverter yog hloov AC tam sim no mus rau ib theem siab AC tam sim no (50 ~ 10000Hz), suav nrog lub zog hluav taws xob inverter, pib lub zog hluav taws xob, thiab lub zog hluav taws xob.Thaum kawg, ib-theem nruab nrab zaus alternating tam sim no nyob rau hauv lub induction kauj nyob rau hauv lub cub tawg generates ib tug nruab nrab-frequency alternating magnetic teb, uas ua rau tus nqi nyob rau hauv lub cub tawg los tsim induction electromotive quab yuam, generates ib tug loj eddy tam sim no nyob rau hauv tus nqi, thiab heats tus nqi kom yaj.
Harmonic Analysis
Cov harmonics txhaj rau hauv daim phiaj fais fab los ntawm qhov nruab nrab zaus fais fab mov feem ntau tshwm sim hauv cov khoom siv rectifier.Ntawm no peb coj peb-theem rau-pulse tag nrho-tswj choj rectifier Circuit Court ua piv txwv los txheeb xyuas cov ntsiab lus ntawm kev sib haum xeeb.Tsis quav ntsej tag nrho cov txheej txheem hloov mus rau theem thiab tam sim no pulsation ntawm thyristor inverter Circuit Court ntawm peb-theem khoom-tso saw, xav tias AC sab reactance yog xoom thiab AC inductance yog infinite, siv Fourier tsom xam txoj kev, qhov tsis zoo thiab zoo ib nrab. -wave tam sim no tuaj yeem yog qhov chaw nruab nrab ntawm lub voj voog yog siv los ua qhov xoom taw tes ntawm lub sijhawm, thiab cov qauv yog muab los xam cov a-theem voltage ntawm AC sab.
Hauv cov mis: Id yog tus nqi nruab nrab ntawm DC sab tam sim no ntawm lub voj voog rectifier.
Nws tuaj yeem pom los ntawm cov qauv saum toj no uas rau 6-pulse nruab nrab zaus rauv, nws tuaj yeem tsim ntau tus lej ntawm 5, 7, 1st, 13th, 17th, 19th thiab lwm yam kev sib haum xeeb, uas tuaj yeem ua tiav raws li 6k ± 1 (k yog qhov zoo Integer) harmonics, tus nqi zoo ntawm txhua qhov kev sib haum xeeb yog inversely proportional to the harmonic order, and the ratio to the fundamental effective value is the reciprocal of harmonic order.
Intermediate zaus rauv hluav taws xob Circuit Court qauv.
Raws li qhov sib txawv ntawm DC lub zog cia khoom, cov khoom siv hluav taws xob nruab nrab feem ntau tuaj yeem muab faib ua hom tam sim no nruab nrab zaus furnaces thiab voltage hom intermediate zaus furnaces.Lub zog cia khoom ntawm tam sim no hom nruab nrab zaus rauv yog ib qho loj inductor, thaum lub zog cia khoom ntawm qhov hluav taws xob hom nruab nrab zaus rauv yog lub capacitor loj.Muaj lwm qhov sib txawv ntawm ob, xws li: tam sim no-hom nruab nrab zaus rauv yog tswj los ntawm thyristor, load resonance Circuit Court yog parallel resonance, thaum voltage-type intermediate zaus rauv yog tswj los ntawm IGBT, thiab load resonance Circuit Court yog. series resonance.Nws cov qauv yooj yim yog pom hauv daim duab 2 thiab daim duab 3.
harmonic tiam
Lub npe hu ua high-order harmonics xa mus rau cov khoom saum toj no cov lej ntau ntawm cov zaus uas tau txais los ntawm decomposing lub sij hawm tsis-sinusoidal AC Fourier series, feem ntau hu ua high-order harmonics.Zaus (50Hz) Cov khoom siv ntawm tib zaus.Harmonic cuam tshuam yog qhov loj "kev cuam tshuam rau pej xeem" uas cuam tshuam rau lub zog zoo ntawm lub zog hluav taws xob tam sim no.
Harmonics txo qhov kev sib kis thiab kev siv hluav taws xob engineering, ua rau cov khoom siv hluav taws xob overheat, ua rau muaj kev vibration thiab suab nrov, ua rau cov txheej txheem rwb thaiv tsev tsis zoo, txo cov kev pab cuam lub neej, thiab ua rau muaj kev cuam tshuam thiab hlawv.Ua kom cov ntsiab lus sib haum xeeb, hlawv tawm cov khoom siv them nyiaj capacitor thiab lwm yam khoom siv.Nyob rau hauv cov ntaub ntawv uas invalidation them tsis tau siv, invalidation nplua yuav tshwm sim thiab cov nqi hluav taws xob yuav nce.High-order mem tes tam sim no yuav ua rau kev ua haujlwm tsis raug ntawm cov khoom siv tiv thaiv relay thiab cov neeg hlau ntse, thiab kev ntsuas qhov tseeb ntawm kev siv hluav taws xob yuav tsis meej pem.Nyob rau sab nraud ntawm cov khoom siv hluav taws xob, kev sib haum xeeb muaj kev cuam tshuam zoo rau cov khoom siv sib txuas lus thiab cov khoom siv hluav taws xob.Lub overvoltage ib ntus thiab ib ntus overvoltage uas tsim kom muaj kev sib haum xeeb yuav rhuav tshem cov txheej txheem rwb thaiv tsev ntawm cov tshuab thiab cov khoom siv, ua rau peb-theem luv-circuit faults, thiab cov harmonic tam sim no thiab voltage ntawm cov transformers puas yuav ua ib feem ua series resonance thiab parallel resonance nyob rau hauv pej xeem lub hwj chim network. , ua rau muaj kev nyab xeeb loj.
Lub tshuab hluav taws xob nruab nrab zaus hluav taws xob yog ib hom hluav taws xob nruab nrab zaus, uas hloov mus rau nruab nrab zaus los ntawm kev txiav txim siab thiab inverter, thiab ua rau muaj ntau yam teeb meem kev sib raug zoo siab nyob rau hauv daim phiaj fais fab.Yog li ntawd, kev txhim kho lub zog zoo ntawm qhov nruab nrab zaus furnaces tau dhau los ua qhov tseem ceeb tshaj plaws ntawm kev tshawb fawb tshawb fawb.
txoj kev npaj
Ib tug loj tus naj npawb ntawm cov ntaub ntawv sib txuas ntawm nruab nrab zaus furnaces tau aggravated lub mem tes tam sim no muaj kuab paug ntawm daim phiaj fais fab.Kev tshawb fawb txog kev tswj hwm kev sib haum xeeb ntawm qhov nruab nrab zaus qhov cub tau dhau los ua txoj haujlwm ceev, thiab tau txais txiaj ntsig los ntawm cov kws tshawb fawb.Txhawm rau ua kom muaj kev cuam tshuam ntawm kev sib haum xeeb uas tsim los ntawm lub tshuab hluav taws xob zaus ntawm cov phiaj xwm pej xeem ua tau raws li qhov yuav tsum tau muaj ntawm cov khoom siv hluav taws xob thiab kev faib khoom siv rau cov khoom lag luam hauv av, nws yog ib qho tsim nyog yuav tsum tau ua kom muaj kev ntsuas kom tshem tawm cov pa phem.Cov kev ceev faj ua raws li nram no.
Ua ntej, lub transformer siv Y / Y / kev sib txuas qauv.Nyob rau hauv qhov chaw loj nruab nrab zaus induction rauv, qhov tawg-pov thawj hloov pauv hloov pauv siv Y / Y / △ txoj kev xaim.Los ntawm kev hloov txoj kev xaim ntawm lub ballast kom sib txuas lus nrog AC sab transformer, nws tuaj yeem cuam tshuam cov yam ntxwv siab ntawm kev txiav txim siab tam sim no uas tsis siab.Tab sis tus nqi yog siab.
Qhov thib ob yog siv LC passive lim.Lub ntsiab qauv yog siv cov capacitors thiab reactors nyob rau hauv series los tsim LC series rings, uas yog sib npaug zos rau hauv lub system.Txoj kev no yog ib txwm siv thiab tuaj yeem them nyiaj rau ob qho tib si harmonics thiab reactive loads.Nws muaj cov qauv yooj yim thiab tau siv dav.Txawm li cas los xij, kev them nyiaj ua haujlwm tau cuam tshuam los ntawm cov yam ntxwv impedance ntawm lub network thiab kev ua haujlwm ib puag ncig, thiab nws yooj yim ua rau muaj kev sib txuam nrog cov kab ke.Nws tsuas tuaj yeem them rov qab rau cov zaus zaus mem tes tam sim no, thiab cov txiaj ntsig them nyiaj tsis zoo.
Thib peb, los ntawm kev siv APF nquag lim, kev txiav txim siab sib haum xeeb yog ib txoj hauv kev tshiab.APF yog cov khoom siv hluav taws xob hluav taws xob tam sim no, nrog rau kev faib tawm siab tsim thiab kev ua haujlwm siab ceev, nws tuaj yeem taug qab thiab them nyiaj rau cov mem tes tam sim no nrog kev hloov pauv zaus thiab siv zog, muaj kev ua haujlwm zoo, thiab cov nyiaj them poob haujlwm yuav tsis cuam tshuam los ntawm cov yam ntxwv impedance.Cov txiaj ntsig ntawm cov nyiaj them tam sim no yog qhov zoo, yog li nws muaj nuj nqis dav.
Lub zog lim dej yog tsim los ntawm kev lim dej passive, thiab nws cov nyhuv lim dej zoo heev.Nyob rau hauv qhov ntau ntawm nws cov nqi reactive zog load, cov nyhuv filtering yog 100%.
Lub zog lim dej, uas yog, lub zog lim dej, APF lub zog lim dej sib txawv los ntawm cov txheej txheem them nyiaj ruaj khov ntawm cov lim dej ib txwm muaj, thiab paub txog cov nyiaj tau los ntawm cov nyiaj tau los, uas tuaj yeem them rov qab cov kev sib raug zoo thiab lub zog reactive ntawm qhov loj thiab zaus.Lub APF cov lim dej muaj nyob rau hauv cov khoom siv hluav taws xob zoo li niaj hnub no.Nws saib xyuas cov load tam sim no nyob rau lub sijhawm tiag tiag raws li kev hloov pauv sab nraud, suav cov kev txiav txim siab pulse tam sim no hauv kev thauj khoom tam sim no raws li DSP sab hauv, thiab tso tawm cov ntaub ntawv tswj cov teeb liab rau lub zog inverter., Cov khoom siv hluav taws xob inverter yog siv los tsim kom muaj kev sib raug zoo tam sim no ntawm tib qhov loj raws li qhov kev txiav txim siab sib haum xeeb tam sim no, thiab rov qab txiav txim siab sib haum xeeb tam sim no tau nkag mus rau hauv daim phiaj hluav taws xob kom tswj tau lub zog lim dej.
Txoj cai ua haujlwm ntawm APF
Hongyan nquag lim pom cov load tam sim no nyob rau hauv lub sij hawm ntawm lub sab nraud tam sim no transformer CT, thiab rho tawm cov harmonic tivthaiv ntawm lub load tam sim no los ntawm internal DSP xam, thiab converts nws mus rau hauv ib tug tswj lub teeb liab nyob rau hauv lub digital teeb liab processor.Nyob rau tib lub sijhawm, cov teeb liab digital processor tsim cov kab ke ntawm PWM pulse width modulation signals thiab xa lawv mus rau sab hauv IGBT fais fab module, tswj cov zis theem ntawm lub inverter kom rov qab mus rau cov kev taw qhia ntawm lub load harmonic tam sim no, thiab tam sim no. nrog tib lub amplitude, ob qhov kev sib haum xeeb tam sim no yog qhov sib txawv ntawm ib leeg.Offset, thiaj li ua tiav cov haujlwm ntawm filtering harmonics.
APF technical nta
1. Peb-theem tshuav nyiaj li cas
2. Reactive fais fab nyiaj them, muab lub hwj chim yam
3. Nrog tsis siv neeg tam sim no limiting muaj nuj nqi, tsis muaj overload yuav tshwm sim
4. Harmonic them nyiaj, tuaj yeem lim tawm 2 ~ 50th harmonic tam sim no tib lub sijhawm
5. Yooj yim tsim thiab xaiv, tsuas yog yuav tsum ntsuas qhov loj ntawm qhov sib haum xeeb tam sim no
6. Ib-theem dynamic txhaj tshuaj tam sim no, tsis cuam tshuam los ntawm qhov system tsis txaus
7. Teb rau kev hloov pauv hauv 40US, lub sijhawm teb tag nrho yog 10ms (1/2 voj voog)
Cov nyhuv lim
Kev tswj hwm kev sib haum xeeb yog siab li 97%, thiab kev tswj hwm kev sib haum xeeb yog dav li 2 ~ 50 zaug.
Txoj kev lim dej nyab xeeb thiab ruaj khov dua;
Txoj kev tswj kev cuam tshuam hauv kev lag luam, kev hloov pauv zaus yog siab li 20KHz, uas txo qhov kev lim dej tsis zoo thiab txhim kho kev lim dej nrawm thiab qhov tseeb ntawm cov zis.Thiab nws nthuav tawm infinite impedance rau daim phiaj system, uas tsis cuam tshuam rau daim phiaj system impedance;thiab cov zis waveform yog qhov tseeb thiab flawless, thiab yuav tsis cuam tshuam rau lwm yam khoom siv.
Muaj zog ib puag ncig adaptability
Tau tshaj lub tshuab hluav taws xob diesel, txhim kho lub peev xwm ntawm thaub qab fais fab shunting;
Siab siab kam rau cov input voltage fluctuations thiab distortions;
Txheem C-chav kawm xob tiv thaiv ntaus ntawv, txhim kho lub peev xwm tiv taus huab cua phem;
Qhov siv tau ntawm qhov kub thiab txias yog qhov muaj zog, txog li -20 ° C ~ 70 ° C.
Daim ntawv thov
Cov cuab yeej tseem ceeb ntawm lub tuam txhab foundry yog qhov nruab nrab zaus hluav taws xob rauv taws.Qhov nruab nrab zaus hluav taws xob rauv yog ib qho kev sib haum xeeb, uas ua rau muaj ntau yam sib haum xeeb, ua rau cov nyiaj them poob haujlwm tsis ua haujlwm ib txwm.Los yog li ntawd, qhov kub ntawm lub transformer nce mus txog 75 degrees nyob rau hauv lub caij ntuj sov, ua rau kom pov tseg ntawm hluav taws xob lub zog thiab shortening nws lub neej.
Lub rooj cob qhia ntawm lub tshuab hluav taws xob nruab nrab yog siv los ntawm 0.4KV voltage, thiab nws lub ntsiab load yog 6-pulse rectification intermediate zaus rauv.Cov khoom siv rectifier tsim muaj ntau qhov sib haum xeeb thaum hloov AC rau DC thaum ua haujlwm, uas yog ib qho kev sib haum xeeb;harmonic tam sim no yog txhaj rau hauv daim phiaj fais fab, Harmonic voltage yog tsim los ntawm daim phiaj impedance, ua rau daim phiaj voltage thiab tam sim no distortion, cuam tshuam rau lub hwj chim mov zoo thiab kev nyab xeeb kev khiav hauj lwm, nce kab poob thiab voltage offset, thiab muaj kev cuam tshuam tsis zoo rau daim phiaj thiab cov cov khoom siv hluav taws xob ntawm lub Hoobkas nws tus kheej.
1. Cov yam ntxwv kev sib haum xeeb
1) Cov cuab yeej rectification ntawm qhov nruab nrab zaus rauv yog 6-pulse controllable rectification;
2) Cov harmonics tsim los ntawm lub rectifier yog 6K + 1 khib harmonics.Fourier series yog siv los decompose thiab hloov tam sim no.Nws tuaj yeem pom tias tam sim no waveform muaj 6K ± 1 ntau dua harmonics.Raws li cov ntaub ntawv ntsuam xyuas ntawm qhov nruab nrab zaus qhov cub, qhov kev sib haum xeeb Cov ntsiab lus yoj tam sim no tau qhia hauv cov lus hauv qab no:
Thaum lub sij hawm ua hauj lwm ntawm lub nruab nrab zaus rauv, ib tug loj tus naj npawb ntawm harmonics yog generated.Raws li kev ntsuam xyuas thiab kev suav cov txiaj ntsig ntawm qhov nruab nrab zaus qhov cub, cov yam ntxwv sib haum xeeb feem ntau yog 5th, thiab 7th, 11th, thiab 13th harmonic tam sim no kuj loj, thiab qhov voltage thiab tam sim no distortion yog loj.
2. Harmonic tswj tswvyim
Raws li qhov teeb meem tiag tiag ntawm kev lag luam, Hongyan Electric tau tsim cov txheej txheem lim dej kom tiav rau kev tswj hwm kev sib haum xeeb ntawm nruab nrab zaus furnaces.Xav txog cov khoom siv fais fab, kev xav tau kev sib haum xeeb thiab kev sib haum xeeb tom qab, ib txheej ntawm cov khoom siv lim dej tau nruab rau ntawm 0.4KV qis-voltage sab ntawm kev lag luam transformer.Harmonics yog tswj hwm.
3. Lim cov nyhuv tsom xam
1) Cov cuab yeej lim dej tau muab tso rau hauv kev ua haujlwm, thiab tuaj yeem taug qab cov kev hloov pauv ntawm ntau yam khoom siv thauj khoom ntawm lub tshuab hluav taws xob nruab nrab, kom txhua qhov kev sib haum xeeb tuaj yeem lim tawm tau zoo.Tsis txhob burnout tshwm sim los ntawm parallel resonance ntawm lub capacitor bank thiab lub system Circuit Court, thiab xyuas kom meej lub cev ua hauj lwm ntawm lub reactive hwj chim them txee;
2) Harmonic tam sim no tau txhim kho zoo tom qab kho.Lub 5th, 7th, thiab 11th harmonic tam sim no uas tsis tau muab tso rau hauv kev siv tau hnyav heev.Piv txwv li, 5th harmonic tam sim no poob ntawm 312A txog 16A;7th harmonic tam sim no poob los ntawm 153A txog 11A;11th harmonic tam sim no poob ntawm 101A mus txog 9A;Ua raws li lub teb chaws tus qauv GB / T14549-93 "Power Quality Harmonics of Public Grid";
3) Tom qab kev tswj hwm kev sib raug zoo, qhov kub ntawm lub transformer yog txo los ntawm 75 degrees mus rau 50 degrees, uas txuag hluav taws xob ntau zog, txo qhov poob ntawm transformer ntxiv, txo cov suab nrov, txhim kho lub peev xwm ntawm lub transformer, thiab prolongs lub transformer. kev pab cuam lub neej ntawm lub transformer;
4) Tom qab kev kho mob, cov khoom siv hluav taws xob zoo ntawm lub tshuab hluav taws xob nruab nrab ntawm lub tshuab hluav taws xob tau zoo dua qub, thiab kev siv hluav taws xob nruab nrab ntawm cov khoom siv hluav taws xob tau zoo dua qub, uas yog qhov tsim nyog rau lub sij hawm ntev kev nyab xeeb thiab kev lag luam ntawm lub kaw lus thiab kev txhim kho. cov txiaj ntsig kev lag luam;
5) Txo cov txiaj ntsig zoo ntawm cov khoom siv tam sim no ntws los ntawm cov kab xa tawm, txhim kho cov khoom siv hluav taws xob, thiab tshem tawm cov kev sib haum xeeb uas ntws los ntawm cov kab xa tawm, yog li txo cov kab poob zoo heev, txo qhov kub ntawm qhov hluav taws xob faib hluav taws xob, thiab txhim kho cov khoom thauj. muaj peev xwm ntawm kab;
6) Txo qhov kev ua haujlwm tsis zoo lossis tsis kam ntawm cov cuab yeej tswj thiab cov khoom siv tiv thaiv relay, thiab txhim kho kev nyab xeeb thiab kev ntseeg siab ntawm cov khoom siv hluav taws xob;
7) Kev them nyiaj rau peb-theem tam sim no tsis txaus, txo cov tooj liab poob ntawm lub transformer thiab cov kab thiab qhov nruab nrab tam sim no, thiab txhim kho cov khoom siv hluav taws xob zoo;
8) Tom qab APF txuas nrog, nws tseem tuaj yeem ua rau muaj peev xwm thauj khoom ntawm cov khoom siv hluav taws xob thiab cov xaim xaim hluav taws xob, uas yog sib npaug rau kev nthuav dav ntawm cov kab ke thiab txo cov peev txheej hauv kev nthuav dav.
Lub sij hawm xa tuaj: Plaub Hlis-13-2023