Lub lim tiam no peb yuav los tshuaj xyuas kev siv cov film capacitors es tsis txhob siv electrolytic capacitors hauv DC-link capacitors. Tsab xov xwm no yuav muab faib ua ob ntu.

Nrog rau kev txhim kho ntawm kev lag luam fais fab tshiab, cov thev naus laus zis hloov pauv tam sim no feem ntau siv raws li qhov ntawd, thiab DC-Link capacitors yog qhov tseem ceeb tshwj xeeb ua ib qho ntawm cov khoom siv tseem ceeb rau kev xaiv. Cov DC-Link capacitors hauv DC lim feem ntau xav tau lub peev xwm loj, kev ua haujlwm tam sim no siab thiab hluav taws xob siab, thiab lwm yam. Los ntawm kev sib piv cov yam ntxwv ntawm cov yeeb yaj kiab capacitors thiab electrolytic capacitors thiab kev tshuaj xyuas cov ntawv thov cuam tshuam, daim ntawv no xaus lus tias hauv kev tsim hluav taws xob xav tau hluav taws xob ua haujlwm siab, hluav taws xob ripple siab (Irms), kev xav tau over-voltage, voltage reversal, hluav taws xob inrush siab (dV / dt) thiab lub neej ntev. Nrog rau kev txhim kho ntawm cov thev naus laus zis metallized vapor deposition thiab cov thev naus laus zis film capacitor, cov yeeb yaj kiab capacitors yuav dhau los ua tus qauv rau tus tsim qauv los hloov cov electrolytic capacitors hauv cov nqe lus ntawm kev ua tau zoo thiab tus nqi yav tom ntej.

Nrog rau kev qhia txog cov cai tshiab ntsig txog lub zog thiab kev txhim kho kev lag luam zog tshiab hauv ntau lub tebchaws, kev txhim kho cov lag luam cuam tshuam hauv daim teb no tau coj cov cib fim tshiab. Thiab cov capacitors, ua ib qho tseem ceeb hauv kev lag luam khoom lag luam upstream, kuj tau txais cov cib fim tshiab. Hauv lub zog tshiab thiab cov tsheb fais fab tshiab, cov capacitors yog cov khoom tseem ceeb hauv kev tswj hwm lub zog, kev tswj hwm lub zog, lub zog inverter thiab DC-AC hloov pauv uas txiav txim siab lub neej ntawm lub converter. Txawm li cas los xij, hauv lub inverter, lub zog DC yog siv ua lub zog nkag, uas txuas nrog lub inverter los ntawm DC bus, uas hu ua DC-Link lossis DC txhawb nqa. Txij li thaum lub inverter tau txais RMS siab thiab cov hluav taws xob siab tshaj plaws los ntawm DC-Link, nws tsim cov hluav taws xob siab ntawm DC-Link, ua rau nws nyuaj rau lub inverter tiv taus. Yog li ntawd, lub capacitor DC-Link yog qhov xav tau los nqus cov hluav taws xob siab los ntawm DC-Link thiab tiv thaiv qhov kev hloov pauv hluav taws xob siab ntawm lub inverter nyob hauv qhov ntau thiab tsawg; ntawm qhov tod tes, nws kuj tiv thaiv cov inverters los ntawm kev cuam tshuam los ntawm qhov hluav taws xob overshoot thiab transient over-voltage ntawm DC-Link.

Daim duab qhia txog kev siv DC-Link capacitors hauv lub zog tshiab (xws li kev tsim hluav taws xob cua thiab kev tsim hluav taws xob photovoltaic) thiab cov tshuab tsav tsheb lub zog tshiab tau qhia nyob rau hauv Daim Duab 1 thiab 2.

Daim Duab 1 qhia txog lub topology ntawm lub zog hloov pauv cua, qhov twg C1 yog DC-Link (feem ntau koom ua ke rau lub module), C2 yog IGBT absorption, C3 yog LC filtering (sab net), thiab C4 sab rotor DV/DT filtering. Daim Duab 2 qhia txog lub tshuab hloov pauv hluav taws xob PV, qhov twg C1 yog DC filtering, C2 yog EMI filtering, C4 yog DC-Link, C6 yog LC filtering (sab grid), C3 yog DC filtering, thiab C5 yog IPM/IGBT absorption. Daim Duab 3 qhia txog lub cev muaj zog tsav tsheb tseem ceeb hauv lub tsheb fais fab tshiab, qhov twg C3 yog DC-Link thiab C4 yog IGBT absorption capacitor.

Hauv cov ntawv thov zog tshiab uas tau hais los saum toj no, DC-Link capacitors, ua lub cuab yeej tseem ceeb, yog qhov xav tau rau kev ntseeg siab thiab lub neej ntev hauv cov tshuab tsim hluav taws xob cua, cov tshuab tsim hluav taws xob photovoltaic thiab cov tshuab tsheb fais fab tshiab, yog li lawv qhov kev xaiv yog qhov tseem ceeb heev. Cov hauv qab no yog kev sib piv ntawm cov yam ntxwv ntawm cov zaj duab xis capacitors thiab electrolytic capacitors thiab lawv qhov kev tshuaj xyuas hauv daim ntawv thov DC-Link capacitor.

1. Kev sib piv ntawm cov yam ntxwv

1.1 Cov khoom siv ua yeeb yaj kiab

Lub hauv paus ntsiab lus ntawm cov txheej txheem ua kom cov hlau nplaum yog thawj zaug qhia: ib txheej hlau nyias txaus raug ua pa rau ntawm qhov chaw ntawm cov txheej txheem ua kom cov hlau nplaum nyias. Yog tias muaj qhov tsis zoo hauv cov txheej txheem, txheej hlau no tuaj yeem ua pa thiab cais qhov chaw tsis zoo kom tiv thaiv tau, qhov xwm txheej hu ua kev kho tus kheej.

Daim Duab 4 qhia txog lub hauv paus ntsiab lus ntawm kev txheej txheej metallization, qhov twg cov zaj duab xis nyias nyias raug kho ua ntej (corona lossis lwm yam) ua ntej ua pa kom cov hlau molecules tuaj yeem lo rau nws. Cov hlau raug ua pa los ntawm kev yaj ntawm qhov kub siab hauv qab lub tshuab nqus tsev (1400 ℃ txog 1600 ℃ rau txhuas thiab 400 ℃ txog 600 ℃ rau zinc), thiab cov pa hlau sib sau ua ke rau ntawm qhov chaw ntawm zaj duab xis thaum nws ntsib zaj duab xis txias (zaj duab xis txias kub -25 ℃ txog -35 ℃), yog li tsim cov txheej txheej hlau. Kev txhim kho ntawm cov txheej txheem metallization tau txhim kho lub zog dielectric ntawm zaj duab xis dielectric ib chav tuab, thiab kev tsim cov capacitor rau kev siv pulse lossis discharge ntawm cov txheej txheem qhuav tuaj yeem ncav cuag 500V / µm, thiab kev tsim cov capacitor rau DC lim daim ntawv thov tuaj yeem ncav cuag 250V / µm. DC-Link capacitor yog rau qhov kawg, thiab raws li IEC61071 rau kev siv hluav taws xob capacitor tuaj yeem tiv taus qhov hluav taws xob hnyav dua, thiab tuaj yeem ncav cuag 2 npaug ntawm qhov hluav taws xob ntsuas.

Yog li ntawd, tus neeg siv tsuas yog yuav tsum xav txog qhov ntsuas hluav taws xob ua haujlwm uas xav tau rau lawv tus qauv tsim. Cov capacitors zaj duab xis metallized muaj ESR qis, uas tso cai rau lawv kom tiv taus cov dej ntws loj dua; ESL qis dua ua tau raws li qhov xav tau tsim inductance qis ntawm cov inverters thiab txo cov oscillation effect ntawm switching frequencies.

Qhov zoo ntawm cov zaj duab xis dielectric, qhov zoo ntawm cov txheej metallization, tus qauv tsim capacitor thiab cov txheej txheem tsim khoom txiav txim siab tus kheej kho cov yam ntxwv ntawm cov metallized capacitors. Cov zaj duab xis dielectric siv rau DC-Link capacitors tsim tawm feem ntau yog OPP zaj duab xis.

Cov ntsiab lus ntawm tshooj 1.2 yuav muab luam tawm rau hauv tsab xov xwm lub lim tiam tom ntej.