VFD DC Link System Txheej txheem cej luam: Lub zog Hub thiab Cov Tshuab Tseem Ceeb Txhawb rau Kev Sib Tw Sib Tw

Nyob rau hauv Variable Frequency Drive (VFD) system, DC txuas, raws li cov khoom tseem ceeb txuas rau pem hauv ntej -kawg rectifier unit thiab rov qab -kawg inverter unit, ua ntau yam haujlwm xws li lub zog buffering, voltage stabilization, thiab harmonic suppression. Nws yog ib qho tseem ceeb subsystem txiav txim siab qhov kev ntseeg tau thiab lub zog zoo ntawm VFD kev ua haujlwm. Qhov tseem ceeb, nws kho AC lub zog rau hauv DC lub zog, khw muag khoom thiab tswj nws, muab qhov ruaj khov thiab tswj tau DC fais fab mov mus rau theem inverter, yog li ua tiav cov kev cai ntawm lub cev muaj zog thiab lub zog.

Lub hauv paus ntsiab lus ntawm DC txuas system muaj xws li ib tug rectifier Circuit Court, ib tug DC bus capacitor (los yog inductor zog cia chav tsev), thiab coj filtering, tiv thaiv, thiab xyuas circuits. Lub rectifier Circuit Court feem ntau siv cov kev tswj tsis tau diode rectification lossis tswj thyristor / IGBT rectification schemes. Cov qub muaj cov qauv yooj yim thiab tus nqi qis, tsim nyog rau cov xwm txheej uas tsis tshua muaj kev tawm tswv yim fais fab kev xav tau; tom kawg tuaj yeem txhim kho lub zog zoo thiab ua kom muaj kev sib haum xeeb los ntawm kev tswj theem, tab sis nce qhov system complexity. Lub pulsating DC voltage tso zis los ntawm lub rectifier yog lim los ntawm DC lub tsheb npav capacitor los tsim ib qho kev ruaj khov DC voltage, muab lub zog rau tus choj inverter.

Lub luag haujlwm tseem ceeb ntawm DC txuas yog feem ntau lub zog buffering. Vim lub sij hawm sib txawv ntawm lub rectifier thiab inverter outputs (xws li, rov qab zog generated thaum lub cev muaj zog regenerative braking), lub DC bus capacitor yuav nqus los yog tso tawm instantaneous fais fab sib txawv, tiv thaiv DC voltage fluctuations los ntawm kev cuam tshuam inverter stability. Thib ob, los ntawm rationally tsim lub tsheb npav capacitor tus nqi thiab topology, cov tswv yim - sab harmonics tuaj yeem ua rau muaj txiaj ntsig zoo, txo cov pa phem rau hauv daim phiaj hluav taws xob. Tshwj xeeb tshaj yog nyob rau hauv kev lag luam scenarios nrog ntau VFDs kev khiav hauj lwm nyob rau hauv parallel, ib tug unified filtering tsim rau DC txuas tuaj yeem txhim kho lub zog tag nrho ntawm lub cev.

Hais txog cov yam ntxwv ntawm kev ua haujlwm, kev ruaj ntseg ntawm DC txuas hluav taws xob ncaj qha cuam tshuam rau kev ua haujlwm ntawm VFD. Cov tsheb npav ntau dhau yuav ua rau muaj kev puas tsuaj rau lub inverter module, thaum tsis muaj qhov hluav taws xob tsis txaus yuav ua rau cov zis tsis txaus lossis txawm tias kaw. Yog li ntawd, niaj hnub VFDs feem ntau yog nruab nrog DC voltage xyuas thiab tiv thaiv circuits, ua rau cov txheej txheem xws li kev txo qis, kaw, lossis lub zog dissipation (xws li, ua kom lub braking resistor) thaum lub zog siab tshaj qhov pib. Tsis tas li ntawd, rau kev ua haujlwm ntawm lub zog regenerative, qee qhov siab -kawg tshuab qhia txog kev ua haujlwm pem hauv ntej-end (AFE) rectification lossis cov lus tawm tswv yim los hloov lub zog braking rau hauv AC cov lus qhia uas yog nyob rau theem thiab zaus nrog rau daim phiaj fais fab, txhim kho kev siv hluav taws xob thiab txo cov cua sov.

Kev tsim ntawm DC txuas yuav tsum muaj kev txiav txim siab zoo ntawm cov khoom siv hluav taws xob, kev thauj khoom inertia, braking zaus, thiab ib puag ncig. Piv txwv li, siab -inertia loads xav tau cov tsheb npav loj dua kom nqus tau lub zog rov qab; high- qhov kub thiab txias ib puag ncig yuav tsum tau siv high-kub resistant capacitors thiab optimized heat dissipation structures. Nrog rau daim ntawv thov dav -bandgap semiconductor li, kev hloov zaus thiab kev ua haujlwm ntawm DC txuas txuas ntxiv txhim kho, thaum qhov loj thiab tus nqi tau maj mam ua kom zoo dua qub, ua rau lawv siv ntau dua hauv lub zog tshiab, kev tsim khoom ntse, thiab kev tswj ceev ceev.

Raws li "lub zog hub" ntawm VFDs, DC txuas system ua tiav qhov hloov pauv hloov pauv ntawm AC lub zog thiab lub cev muaj zog thauj khoom los ntawm kev sib koom ua ke ntawm kev hloov kho, lim dej, lub zog cia, thiab kev tiv thaiv, muab kev txhawb nqa tsis tseem ceeb rau kev ua haujlwm zoo, ruaj khov, thiab kev txawj ntse ntawm kev lag luam niaj hnub.