2. Kev faib tawm thiab cov cwj pwm ntawm cov qauv hluav taws xob ntau zaus
2.1 qib high-low-high scheme
Cov tshuaj no siv qhov kev tsis tshua muaj hluav taws xob nyob hauv siab ua qhov tseem ceeb, uas yog, ntxiv ib theem-hauv inverter rau sab nraud ntawm qhov low-voltage inverter, txo 6KV / 3KV rau qhov input voltage ntawm low-voltage inverter; ntxiv rau ntawm sab hauv lub inverter Ib qho kev tawm qauv ntawm cov qauv hluav taws xob uas muaj qhov sib npaug ntawm qhov hluav taws xob. Txoj kev tswj hwm high-low-high frequency tswj ntau dua nyob rau hauv cov kev lag luam hauv domestic thiab tam sim no yog qhov feem ntau dav siv. Hauv kev ua lag luam, nws yog raws li cov khoom Siemens. Nyob rau hauv cov tshuaj no, raws li daim fais fab ntawm DC fais fab tuag, nws faib tau rau hauv 6-mem tes rectifying unit thiab 12-mem tes rectifying unit. Cov qauv ntawm lub tsev 6-mem tes rectification yog yooj yim, thiab tus nqi ntawm cov kho vajtse configuration yog tsawg. Hauv chav tsev 12-mem tes rectification yog tsim los ntawm peb cov cua tshuab transformer nrog sub-phase qhov sib txawv ntawm 30 degrees thiab ob yam zoo tib yam, thiab yog nyob rau hauv qhov kev hloov tshuab. Lub sab nraud yuav tsum tau txuas nrog rau cov kab reactor, yog li nws tus nqi txhim kho siab dua, tiam sis los ntawm kev tivthaiv kev sib raug zoo, cov nyhuv 12-mem tes rectification zoo dua 6-mem tes, thiab qhov sib xyaw harmonic ntawm 6-mem tes 5, 7 11, 13, 17, 19, 23, 25 npaug, qhov sib thooj ntawm 12 pulsations yog 11, 13, 23, 25 zaug.
Qhov kev zov me nyuam no yog qhov tsim nyog rau cov khoom tuav tseg. Qhov zoo: (1) Qhov kev zov me nyuam yog mature. Ua Siemens cov khoom ua piv txwv, cov naj npawb ntawm cov tau teev hauv Suav tau muab tawm. (2) Lub cav xaib thawj zaug tsis tas yuav hloov. (3) Ib qho haujlwm uas tswj kev hloov. (4) Cov peev yog qis tshaj qhov kev kawm siab. Nws cov kev tsis txaus siab: lub hauv paus txheej txheem yog cov high-low lossis high-high, thiab cov kev siv nyiaj ntev-ntev yog raug siab vim tias tsis muaj cov ntxaij lim dej thiab cov kev pabcuam ntxiv thiab kev hloov tsheb.
2.2 qis-qes-qis tsawg
Cov tub ntxhais ntawm txoj kev npaj qis qis qis qis tseem tseem ua rau cov neeg tsis muaj zog qis dua. Ib qho kev sib tw ua ob kauj ruam nram qab-down transformer yog nruab rau sab hauv lub inverter kom khiav lub siab-voltage lub cev mus rau hauv ib qho siv tau tsawg-voltage variable-zaus tsav voltage. Qhov kev pab cuam tam sim no muaj ntau cov neeg siv nyob rau hauv Suav teb. Muaj ntau daim ntaub ntawv ntawm cov khoom siv Siemens. Lub hauv paus yog tsim ntawm ob kauj ruam ntawm cov kauj ruam qis thiab kev hloov tsheb. Cov txheej txheem system no kuj yooj yim, tshwj xeeb tshaj yog rau cov dej num tshiab. Rau cov kev hloov kho cov haujlwm, hloov cov motors yuav nce cov kev siv nyiaj. Nws qhov kev sib raug zoo yog 5, 7, 11, 13, 17, 19, 19, 23, thiab 25 npaug.
Qhov zoo ntawm qhov kev qhia no yog: (1) Qhov kev zov me nyuam yog mature. Tsawg-voltage IGBT los yog IGCT fais fab tuag yog zoo tsim thiab muaj ntau hom kev siv. (2) Lub cev muaj pes tsawg leeg yog yooj yim thiab muaj ntau txoj kev mus xyuas. (3) Tsawg nqis peev thiab tsawg cov ntsiab lus. Low-voltage inverters yog pheej yig thiab kev lag luam tus nqi yog heev pob tshab. (4) Txiav ntawm qhov kev hloov tshuab hluav taws xob thiab cov nqi ua haujlwm ntev yuav qis. Kev tsis zoo ntawm qhov kev daws teeb meem no: Thaum siv khiav haujlwm, lub tshuab yuav tsum tau hloov, thiab kev ua haujlwm ntawm qhov kev sib hloov yog nce, uas tseem yuav ua rau cov peev nyiaj thiab qhov kev tsim kho lub sijhawm.
2.3 qhov kev kawm siab
High-high inverter yog lub hwj huam muaj hluav taws xob uas ncaj qha mus rau high-voltage inverter tom qab dhau los ntawm kev siab-voltage switchgear. Tom qab muaj kev hloov siab rau qhov siab, qhov voltage ncaj qha nkag rau lub stator ntawm lub siab-voltage lub cev.
Nws muaj plaub hom kev nruab nrab ntawm cov nruab nrab thiab qib siab muaj zog xws li kev tswj ceev ceev: (1) cov khoom siv zog (GTO, SCR, SGCT) series; (2) midpoint clamps nyob rau hauv txoj hauj lwm, uas yog, peb-theem taw (GTO, IGBT); (3) Ntau hom, uas muaj plaub-theem, tsib-theem, thiab lwm yam zoo li (IGBT) feem ntau siv; (4) Single-phase inverters muaj kev cob cog rua hauv koob. Cov kev ua kom siab-voltage inverters tau nkag los hauv xyoo tas los, thiab cov cuab yeej siv technology zoo tshaj plaws, kev ua haujlwm siab, thiab lub chaw me me, uas yog lub ntsiab kev loj hlob ntawm cov neeg ua haujlwm siab.
Lub high-high scheme adopts lub chav tsev kev twb kev txuas (IGBT), thiab siv txoj cai ntawm theem hloov superposition (theem hloov transformer) kom zoo suppress harmonic cuam, li ntawd cov zis waveform yog ze li ntawm sinusoidal. Nws muaj qhov zoo li nram qab no: tsis tas yuav ntxiv cov khoom tso tawm los yog cov khoom siv hluav taws xob; Kev siv cov lus ua tau zoo npaum li 97%, qhov zoo tshaj yuav yog qhov siab, thiab qhov zoo tshaj qhov muaj peev xwm ntau dua 95% load thaum lub thauj khoom> 20% tsis tau them nqi zog> 20%; cov cim ntawm lub tshuab pulsating vim los ntawm tsis muaj kev sib haumxeeb yuav zam tsis txhob muaj cov resonance thiab muab lub neej kev pabcuam ntawm lub cev muaj zog thiab cov khoom siv kho tshuab; nws muaj peev xwm tiv thaiv lub ntsiab kev qev thiab kab hluav taws xob los ntawm dv / dt kev ntxhov siab; lub cev tsis muaj kev cuam tshuam los ntawm hom qauv Cov cawv ntawm qhov tsis muaj zog; lub cav fais fab tsis muaj qhov ntev npaum li cas nyob rau hauv qhov kev tso cai ntawm cov nqes hluav taws xob; tsis muaj kuab paug rau lub hwj chim kab; cov cuab yeej tseem ceeb muaj kev ntseeg tau zoo dua vim tsim tawm redundancy, thiab tuaj yeem hloov rau kev ua haujlwm huab ua haujlwm; lub zog faiv fab tau ua tsis tau li pib ua haujlwm. Nws tuaj yeem txhim kho txoj kev ntseeg ntawm lub hwj chim; nws muaj nuj nqi ntawm instantaneous zog tsis ua hauj lwm yam tsis tau nres. Thaum lub hwj huam tawm qhov hluav taws xob tau txav los yog lub hwj huam tau txiav tawm (hauv 5s), lub inverter yuav tsis nres. Tom qab lub hwj huam hloov hluav taws xob rov qab lawm, nws yuav rov tau ceev nrooj thiab rov qab mus rau nws lub xeev qub. Thaum lub hwj huam tau pab cuam tshuam tsis ntev, lub inverter tsis nres khiav hauv 300ms.
Yog tias koj xav yuav ib lub cav fais fab, thov koj faj seeb rau Lub Tshuab Txiav Txiav Tsheb.
