Arthur Mattuck, tus kws qhia lej ntawm Massachusetts Institute of Technology (MIT), ib zaug tau hais tias "Tsis yog-linearity txhais tau tias nws nyuaj rau kev daws,"Tab sis nws yuav tsum tau hais txog thaum nonlinearity yog siv rau cov khoom siv hluav taws xob, vim tias nws tsim cov kev sib raug zoo tam sim no thiab cuam tshuam tsis zoo rau kev faib hluav taws xob-thiab nws raug nqi.Ntawm no, Marek Lukaszczyk, European thiab Middle East Kev Lag Luam Tus Thawj Coj ntawm WEG, lub chaw tsim khoom thoob ntiaj teb thiab cov khoom siv lub cev muaj zog thiab tsav tsheb, piav qhia yuav ua li cas txo qis kev sib haum xeeb hauv kev siv inverter.
Fluorescent teeb, hloov khoom siv hluav taws xob, hluav taws xob arc rauv, rectifiers thiab zaus converters.Tag nrho cov no yog cov piv txwv ntawm cov khoom siv uas tsis yog-linear loads, uas txhais tau hais tias lub cuab yeej absorbs voltage thiab tam sim no nyob rau hauv daim ntawv ntawm tam sim ntawd pulses.Lawv txawv ntawm cov khoom siv uas muaj cov khoom thauj khoom-xws li lub cev muaj zog, qhov chaw tso cua sov, cov khoom siv hluav taws xob uas muaj zog, thiab cov qhov muag teeb.Rau linear loads, kev sib raug zoo ntawm voltage thiab tam sim no waveforms yog sinusoidal, thiab tam sim no nyob rau hauv txhua lub sij hawm yog proportional rau qhov voltage-hais los ntawm Ohm txoj cai.
Ib qho teeb meem nrog tag nrho cov tsis-linear loads yog tias lawv tsim kom muaj kev sib haum xeeb tam sim no.Harmonics yog cov khoom siv zaus uas feem ntau siab dua qhov zaus ntawm cov khoom siv hluav taws xob, ntawm 50 lossis 60 Hertz (Hz), thiab ntxiv rau qhov tseem ceeb tam sim no.Cov dej ntws ntxiv no yuav ua rau muaj kev cuam tshuam ntawm qhov system voltage waveform thiab txo nws lub hwj chim.
Harmonic tam sim no ntws hauv qhov hluav taws xob tuaj yeem ua rau lwm yam tsis zoo, xws li kev cuam tshuam hluav taws xob ntawm cov ntsiab lus sib txuas nrog lwm cov khoom thauj, thiab overheating ntawm cables.Nyob rau hauv cov ntaub ntawv no, tag nrho cov harmonic distortion (THD) kev ntsuas yuav qhia tau peb ntau npaum li cas ntawm qhov voltage los yog tam sim no distortion yog tshwm sim los ntawm harmonics.
Hauv tsab xov xwm no, peb yuav kawm yuav ua li cas txo qis kev sib haum xeeb hauv kev siv inverter raws li cov lus pom zoo hauv kev lag luam rau kev saib xyuas kom raug thiab kev txhais cov phenomena uas ua rau muaj teeb meem zoo ntawm lub zog.
Lub Tebchaws Askiv siv Daim Ntawv Pom Zoo Engineering (EREC) G5 ntawm Lub Koom Haum Hluav Taws Xob Network (ENA) raws li kev coj ua zoo rau kev tswj hwm qhov sib txawv ntawm qhov sib txawv ntawm cov kab ke sib kis thiab kev faib tawm.Hauv European Union, cov lus pom zoo no feem ntau muaj nyob rau hauv cov lus qhia ntawm electromagnetic compatibility (EMC), uas suav nrog ntau yam International Electrotechnical Commission (IEC) cov qauv, xws li IEC 60050. IEEE 519 feem ntau yog North American tus qauv, tab sis nws tsim nyog sau cia tias IEEE 519 tsom rau kev faib khoom ntau dua li cov khoom siv ib leeg.
Thaum cov qib sib haum xeeb tau txiav txim siab los ntawm kev simulation lossis kev ntsuas, muaj ntau txoj hauv kev los txo qis kom lawv nyob rau hauv qhov kev txwv.Tab sis dab tsi yog qhov kev lees paub?
Txij li nws tsis muaj peev xwm ua tau los yog tsis tuaj yeem tshem tawm tag nrho cov kev sib haum xeeb, muaj ob lub EMC thoob ntiaj teb cov qauv uas txwv tsis pub muaj kev cuam tshuam ntawm lub zog hluav taws xob los ntawm kev qhia txog tus nqi siab tshaj plaws ntawm kev sib haum xeeb tam sim no.Lawv yog cov qauv IEC 61000-3-2, tsim rau cov khoom siv nrog cov ntsuas tam sim no txog 16 A (A) thiab ≤ 75 A ib theem, thiab IEC 61000-3-12 tus qauv, haum rau cov khoom siv siab tshaj 16 A.
Qhov kev txwv ntawm voltage harmonics yuav tsum yog kom THD (V) ntawm qhov taw tes ntawm kev sib txuas (PCC) ntawm ≤ 5%.PCC yog lub ntsiab lus uas cov hluav taws xob hluav taws xob ntawm cov hluav taws xob faib hluav taws xob txuas nrog cov neeg siv khoom siv hluav taws xob thiab txhua lub zog xa hluav taws xob ntawm cov neeg siv khoom thiab cov khoom siv hluav taws xob.
Kev pom zoo ntawm ≤ 5% tau siv raws li qhov yuav tsum tau ua rau ntau daim ntawv thov.Qhov no yog vim li cas nyob rau hauv ntau zaus, tsuas yog siv ib tug inverter nrog ib tug 6-pulse rectifier thiab input reactance los yog ncaj qha tam sim no (DC) txuas inductor yog txaus kom tau raws li qhov siab tshaj plaws voltage distortion pom zoo.Tau kawg, piv rau 6-pulse inverter uas tsis muaj inductor hauv qhov txuas, siv lub inverter nrog DC txuas inductor (xws li WEG tus kheej CFW11, CFW700, thiab CFW500) tuaj yeem txo cov hluav taws xob sib raug zoo.
Txwv tsis pub, muaj ob peb lwm txoj hauv kev los txo qhov kev sib haum xeeb hauv kev siv inverter, uas peb yuav qhia ntawm no.
Ib qho kev daws teeb meem los txo cov kev sib haum xeeb yog siv lub inverter nrog 12-pulse rectifier.Txawm li cas los xij, txoj kev no feem ntau tsuas yog siv thaum lub tshuab hluav taws xob twb tau teeb tsa lawm;rau ntau lub inverters txuas rau tib qhov txuas DC;los yog yog hais tias ib tug tshiab installation yuav tsum tau ib tug transformer nplooj siab rau lub inverter.Tsis tas li ntawd, qhov kev daws teeb meem no haum rau lub zog uas feem ntau ntau dua 500 kilowatts (kW).
Lwm txoj hauv kev yog siv 6-pulse active tam sim no (AC) tsav inverter nrog lub lim passive ntawm cov tswv yim.Txoj kev no tuaj yeem tswj hwm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov nruab nrab (MV), high voltage (HV) thiab ntxiv high voltage (EHV) - thiab txhawb kev sib raug zoo thiab tshem tawm cov kev tsis zoo ntawm cov neeg siv khoom rhiab.Txawm hais tias qhov no yog ib qho kev daws teeb meem los txo cov kev sib haum xeeb, nws yuav ua rau kom kub poob thiab txo qhov muaj zog.
Qhov no coj peb mus rau txoj kev siv nyiaj ntau dua los txo cov kev sib haum xeeb: siv lub inverter nrog 18-pulse rectifier, lossis tshwj xeeb tshaj yog DC-AC tsav siv los ntawm DC txuas los ntawm 18-pulse rectifier thiab theem hloov pauv.Lub pulse rectifier yog tib txoj kev daws teeb meem seb nws yog 12-pulse lossis 18-pulse.Txawm hais tias qhov no yog ib qho kev daws teeb meem los txo cov kev sib haum xeeb, vim nws cov nqi siab, nws feem ntau tsuas yog siv thaum lub tshuab hluav taws xob tau teeb tsa los yog ib qho tshwj xeeb transformer rau lub inverter yog yuav tsum tau rau lub installation tshiab.Lub zog yog feem ntau ntau dua 500 kW.
Qee txoj kev sib haum xeeb ua rau kom poob qis thiab txo lub zog, thaum lwm txoj hauv kev tuaj yeem txhim kho kev ua haujlwm.Ib qho kev daws teeb meem zoo uas peb pom zoo yog siv WEG nquag lim nrog 6-mem tes AC tsav.Qhov no yog ib qho kev daws teeb meem zoo tshaj plaws los tshem tawm cov harmonics tsim los ntawm ntau yam khoom siv
Thaum kawg, thaum lub zog tuaj yeem rov tsim dua rau hauv kab sib chaws, lossis thaum ntau lub cev muaj zog tau tsav los ntawm ib qho DC txuas, lwm qhov kev daws teeb meem yog qhov txaus nyiam.Ntawd yog, kev siv lub hauv ntej kawg (AFE) regenerative tsav thiab LCL lim tau siv.Nyob rau hauv cov ntaub ntawv no, tus neeg tsav tsheb muaj ib tug active rectifier ntawm lub tswv yim thiab ua raws li cov kev txwv pom zoo.
Rau inverters tsis muaj DC txuas-xws li WEG tus kheej CFW500, CFW300, CFW100 thiab MW500 inverters-tus yuam sij kom txo cov kev sib haum xeeb yog lub network reactance.Qhov no tsis tsuas yog daws qhov teeb meem kev sib haum xeeb, tab sis kuj daws qhov teeb meem ntawm lub zog uas tau khaws cia rau hauv qhov reactive ntawm inverter thiab ua tsis tau zoo.Nrog kev pab los ntawm network reactance, ib tug high-frequency ib-theem inverter loaded los ntawm ib tug resonant network yuav siv tau kom paub controllable reactance.Qhov kom zoo dua ntawm txoj kev no yog tias lub zog khaws cia hauv cov khoom reactance qis dua thiab qhov sib txawv ntawm qhov sib txawv yog qis dua.
Muaj lwm txoj hauv kev los daws cov kev sib haum xeeb.Ib qho yog nce tus naj npawb ntawm linear loads piv rau non-linear loads.Lwm txoj hauv kev yog cais cov khoom siv hluav taws xob rau cov kab hluav taws xob thiab cov tsis-linear kom muaj qhov sib txawv ntawm THD txwv ntawm 5% thiab 10%.Txoj kev no ua raws li cov lus qhia saum toj no hais txog engineering (EREC) G5 thiab EREC G97, uas yog siv los ntsuas qhov kev sib haum xeeb voltage distortion ntawm nonlinear thiab resonant nroj tsuag thiab khoom siv.
Lwm txoj kev yog siv lub rectifier nrog ntau cov pulses thiab pub nws mus rau hauv lub transformer nrog ntau theem nrab.Multi-winding transformers nrog ntau lub hauv paus los yog theem nrab windings tuaj yeem txuas rau ib leeg hauv ib hom kev teeb tsa tshwj xeeb los muab qhov yuav tsum tau tso zis voltage theem los yog tsav ntau yam loads ntawm cov zis, yog li muab kev xaiv ntau dua hauv kev faib hluav taws xob thiab kev ua haujlwm yooj yim.
Thaum kawg, muaj qhov rov ua haujlwm tsav ntawm AFE tau hais los saum toj no.Basic AC drives tsis tuaj yeem txuas ntxiv, uas txhais tau hais tias lawv tsis tuaj yeem rov qab tau lub zog rau lub zog hluav taws xob - qhov no tshwj xeeb tshaj yog tsis txaus, vim hais tias hauv qee qhov kev siv, kev siv lub zog rov qab yog qhov yuav tsum tau ua.Yog hais tias lub zog regenerative yuav tsum tau xa rov qab mus rau AC lub zog, qhov no yog lub luag haujlwm ntawm lub tshuab hluav taws xob.Cov rectifiers yooj yim yog hloov los ntawm AFE inverters, thiab lub zog tuaj yeem rov qab los ntawm txoj kev no.
Cov txheej txheem no muab ntau yam kev xaiv los tawm tsam kev sib haum xeeb thiab tsim nyog rau ntau hom kev faib hluav taws xob.Tab sis lawv kuj tuaj yeem txuag hluav taws xob thiab nqi ntau hauv ntau daim ntawv thov thiab ua raws li cov qauv thoob ntiaj teb.Cov piv txwv no qhia tau hais tias ntev li ntev tau siv tshuab inverter kom raug, qhov teeb meem tsis yog linearity yuav tsis yooj yim los daws.
For more information, please contact: WEG (UK) LtdBroad Ground RoadLakesideRedditch WorcestershireB98 8YPT Tel: +44 (0)1527 513800 Email: info-uk@weg.net Website: https://www.weg.net
Cov txheej txheem thiab kev tswj hwm Hnub no tsis yog lub luag haujlwm rau cov ntsiab lus ntawm cov khoom xa lossis cov khoom tsim tawm sab nraud.Nyem qhov no los xa email rau peb qhia peb txog tej yam uas tsis raug lossis kev tso tseg uas muaj nyob rau hauv tsab xov xwm no.