Cov ntaub ntawv tseem ceeb ntawm cov neeg siv
Lub tuam txhab cov khoom siv yas feem ntau tsim cov kav dej PE, cov kav dej hauv cov kav dej, thiab lwm yam. Lub tuam txhab muaj 4 cov kab ntau lawm, ib feem ntawm kev tsav tsheb siv DC brushless motors thiab DC variable zaus tsav motors, muaj plaub txheej ntawm 400KVA, txhua transformer hauv qab siab sab Nruab nrog capacitance them lub thawv.Daim duab ntawm lub hwj chim mov system yog raws li nram no:
Cov ntaub ntawv ua haujlwm tiag tiag
DC lub cev muaj zog ntawm 400KVA transformer, lub zog siab ntawm inverter yog 360KW, qhov nruab nrab lub zog yog PF = 0.7, qhov ua haujlwm tam sim no yog 780A, lub thawv tsis raug cai nyob rau hauv txhua lub transformer feem ntau mus ncig, lub capacitor nthuav tawm thiab xau, thiab tus maub los tswj tsis tau qhov txawv txav, thiab lwm yam Phenomena, qhov kev nthuav dav tsuas yog 0.8, thiab qhov tsis raug nplua yog li ntawm 15,000 ib hlis.Tsis tas li ntawd, cov motors thiab cov pib muag muag hauv cov kab ntau lawm yog qee zaum puas, uas cuam tshuam rau kev tsim khoom.
Power System Situation Analysis
Lub ntsiab load ntawm DC brushless lub cev muaj zog thiab inverter rectifier fais fab mov yog 6 ib leeg-pulse rectifier fais fab mov.Thaum lub sijhawm ua haujlwm ntawm cov khoom siv rectifier, AC tuaj yeem hloov mus rau DC, tsim ntau cov khoom siv hluav taws xob tam sim no, qhia txog kev sib raug zoo tam sim no hauv daim phiaj hluav taws xob, thiab cuam tshuam rau daim phiaj hluav taws xob.Cov yam ntxwv impedance ua rau lub zog ua haujlwm ntawm cov mem tes tam sim no, ua rau lub zog tawm ntawm kev ua haujlwm voltage thiab tam sim no, ua rau muaj kev phom sij rau qhov zoo thiab kev nyab xeeb ntawm kev hloov hluav taws xob, ua rau cov kab poob thiab kev ua haujlwm voltage sib txawv, thiab muaj kev cuam tshuam tsis zoo ntawm daim phiaj hluav taws xob thiab cov khoom siv hluav taws xob ntawm lub tshuab fais fab nws tus kheej.
Qhov program controller computer interface (PLC) rhiab heev rau qhov kev sib haum xeeb ntawm kev ua haujlwm voltage ntawm lub zog hloov hluav taws xob.Nws yog feem ntau hais tias tag nrho cov mem tes tam sim no ua hauj lwm voltage thav duab poob (THD) yog tsawg dua 5%, thiab tus neeg pulse tam sim no ua hauj lwm voltage Yog hais tias tus ncej tus nqi siab dhau lawm, kev khiav hauj lwm yuam kev ntawm kev tswj yuav ua rau muaj kev cuam tshuam ntawm kev tsim khoom lossis kev ua haujlwm, ua rau muaj kev cuam tshuam loj ntawm kev tsim khoom.
Thaum lub reactive fais fab nyiaj them nyiaj capacitor bank yog muab tso rau hauv lub lag luam, vim hais tias tus mem tes tam sim no yam ntxwv impedance ntawm lub capacitor bank yog me me, ib tug loj npaum li cas ntawm cov mem tes tam sim no tau nkag mus rau hauv lub capacitor muaj pes tsawg leeg, thiab cov nyiaj tam sim no nthuav dav, cuam tshuam rau nws lub neej kev pab cuam. .Ntawm qhov tod tes, thaum lub mem tes tam sim no capacitor ntawm lub txhab nyiaj capacitor yog sib npaug rau qhov sib npaug pulse tam sim no inductor ntawm lub kaw lus software, qhov nce hauv kev sib haum xeeb tam sim no (2-10 zaug) yuav ua rau lub capacitor overheat thiab rhuav tshem nws, thiab pulse tam sim no yuav ua rau qhov zaus ntawm cov zis hluav taws xob hloov pauv.Lub sinusoidal waveform yog tawm ntawm lub thav duab, uas ua rau ib tug saw-hlau-zoo li tus nthwv dej, thiab yuav ua rau ib feem ntawm cov ntaub ntawv insulating txheej, yog li ua kom lub embrittlement ntawm cov insulating txheej khoom, thiab ua rau lub capacitor puas.Yog li ntawd, lub capacitor reactive fais fab nyiaj them txee tsis tuaj yeem siv rau DC brushless lub cev muaj zog thiab inverter fais fab kev them nyiaj, thiab lub lim nrog mem tes tam sim no tsub kom muaj nuj nqi yuav tsum tau xaiv rau cov nqi hluav taws xob tsawg reactive zog.
Lim reactive zog them nyiaj kho mob txoj kev npaj
Cov hom phiaj kev tswj hwm
Kev tsim cov khoom siv lim dej ua tau raws li qhov yuav tsum tau muaj ntawm kev sib haum xeeb kev sib tsoo thiab kev tswj xyuas lub zog reactive.
Raws li 0.4KV qhov system ua haujlwm, tom qab cov khoom siv lim dej tau muab tso rau hauv kev ua haujlwm, cov mem tes tam sim no raug txwv, thiab lub hli nruab nrab lub zog yog nyob ib puag ncig 0.92.
High-order harmonic resonance, resonance overvoltage, thiab overcurrent tshwm sim los ntawm kev txuas mus rau lub lim nyiaj them nyiaj ceg Circuit Court yuav tsis tshwm sim.
Tsim raws li tus qauv
Lub hwj chim zoo Public grid harmonics GB / T14519-1993
Lub zog zoo Voltage fluctuation thiab flicker GB12326-2000
General technical tej yam kev mob ntawm low-voltage reactive hwj chim them nyiaj ntaus ntawv GB / T 15576-1995
Tsawg-voltage reactive fais fab nyiaj them nyiaj ntaus ntawv JB / T 7115-1993
Reactive fais fab nyiaj them rau cov kev mob JB/T9663-1999 "Low-voltage reactive fais fab tsis siv neeg them nyiaj" los ntawm high-order harmonic tam sim no txwv tus nqi qis-voltage fais fab thiab cov khoom siv hluav taws xob GB / T17625.7-1998
Cov ntsiab lus Electrotechnical Fais Fab Capacitor GB / T 2900.16-1996
Tsawg voltage shunt capacitor GB / T 3983.1-1989
Reactor GB10229-88
IEC 289-88 Reactor Ua Haujlwm
Tsawg-voltage reactive fais fab nyiaj them nyiaj tswj kev txiav txim kev mob DL / T597-1996
Tsawg-voltage hluav taws xob tiv thaiv qib GB5013.1-1997
Tsawg-voltage ua tiav switchgear thiab tswj cov cuab yeej GB7251.1-1997
Cov tswv yim tsim
Raws li cov xwm txheej tshwj xeeb ntawm lub tuam txhab, peb lub tuam txhab tsim cov txheej txheem kom ntxaws DC lub cev muaj zog thiab lub tshuab hluav taws xob mos reactive zog them nyiaj lim dej.Ua tib zoo xav txog cov khoom siv hluav taws xob thiab kev sib haum xeeb, thiab teeb tsa cov ntxaij lim dej ntawm 0.4KV hauv qab voltage sab ntawm lub tuam txhab transformer rau qis-voltage reactive fais fab nyiaj them rau suppress harmonics, compensate reactive zog, thiab txhim kho lub hwj chim.Thaum lub sijhawm ua haujlwm ntawm DC lub cev muaj zog thiab inverter, lub tshuab rectifier tsim 6K + 1 ntau dua harmonics.Tom qab qhov tam sim no decomposed thiab hloov los ntawm Fourier series, 5 zaug ntawm 250HZ thiab 7 zaug ntawm harmonics siab dua 350HZ yog generated.Yog li ntawd, nyob rau hauv kev tsim ntawm nruab nrab zaus hluav taws xob rauv lim reactive zog them, nws yog tsim nyog los tsim zaus ntawm 250HZ, 350HZ thiab saum toj no los xyuas kom meej tias cov lim nyiaj them nyiaj ceg yuav zoo suppress harmonics thaum compensating reactive zog thiab txhim kho lub hwj chim yam.
txoj haujlwm tsim
Lub zog loj ntawm DC lub cev muaj zog thiab cov khoom siv ntau zaus hloov pauv raws li 400KVA transformer yog them los ntawm 0.7 mus rau ntau tshaj 0.95.Lub tshuab lim dej yuav tsum tau teeb tsa ntawm lub peev xwm ntawm 380kvar, uas tau muab faib ua 4 pawg ntawm lub peev xwm thiab txiav tawm kom them nyiaj rau qhov khoov ntawm qhov qis-voltage sab ntawm lub transformer feem.Lub peev xwm hloov kho yog 45kvar, uas tuaj yeem hloov kho rau ntau lub zog xav tau ntawm cov kab ntau lawm, yog li tus qauv tsim kom ntseeg tau tias lub zog hloov siab tshaj 0.9.
Kev tsom xam cov nyhuv tom qab kev teeb tsa ntawm cov nyiaj lim dej
Nyob rau hauv Lub Xya hli ntuj 2010, lub lim reactive hwj chim them nyiaj ntaus ntawv rau DC motors thiab zaus converters raug ntsia thiab muab tso rau hauv lub lag luam.Cov cuab yeej cia li taug qab cov kev hloov pauv ntawm DC motors thiab zaus converters, suppresses high-order harmonics nyob rau hauv lub sij hawm, compensates reactive zog, thiab txhim kho lub hwj chim.cov ntsiab lus raws li hauv qab no:
Tom qab cov cuab yeej lim dej tau muab tso rau hauv kev siv, lub zog hloov pauv nkhaus tom qab cov khoom siv lim dej raug muab tso rau hauv kev siv yog li 0.99 (qhov tsa ceg yog kwv yees li 0.7 thaum lub lim nyiaj raug tshem tawm)
Kev ua haujlwm thauj khoom
Tam sim no siv los ntawm 400KVA transformer yog txo los ntawm 770A mus rau 520A, poob ntawm 33%.Tom qab them nyiaj, tus nqi poob qis yog WT = △Pd * (S1 / S2) 2 * τ * [1-(cosφ1 / cosφ2) 2] = 5 × {(0.7 × 400) 400}2 × 0.4≈2.8( kw· h) Nyob rau hauv cov mis, Pd yog luv luv-circuit poob ntawm lub transformer, uas yog 5KW, thiab txhua xyoo txuag ntawm cov nqi hluav taws xob yog 2.8 * 20 * 30 * 10 * 0.7 = 11,700 yuan (raws li kev ua hauj lwm 20 teev a hnub, 30 hnub hauv ib hlis, 10 lub hlis ib xyoos, ib kw hluav taws xob 0.7 yuan).
fais fab xwm txheej xwm txheej
Lub tuam txhab cov cai tag nrho tau nce los ntawm 0.7 mus rau 0.95, cov cai txhua hli tseem nyob ntawm 0.96-0.98, thiab kev nplua nce ntawm 15,000 yuan ib hlis mus rau 3,000-5,000 yuan ib hlis.
BLDC lub cev muaj zog thiab lub tshuab hluav taws xob muag muag
Cov khoom siv hluav taws xob reactive muaj peev xwm txo qis cov mem tes tam sim no thiab them rov qab lub zog reactive load, daws qhov teeb meem ntawm reactive hwj chim nplua, ua rau kom cov zis ntim ntawm lub transformer, txo active zog noj, thiab ua rau kom cov zis, coj pom tseeb nyiaj txiag txiaj. rau lub tuam txhab thiab rov qab los ntawm cov neeg siv khoom lag luam ib xyoos dhau los.Yog li ntawd, lub tuam txhab txaus siab heev nrog lub zog reactive them nyiaj ntawm brushless DC motors thiab inverter lim, thiab yuav ua kom paub qee cov neeg siv khoom yav tom ntej.
Post lub sij hawm: Apr-14-2023