N'izu a, anyị ga-enyocha ojiji nke ihe nkiri capacitors kama electrolytic capacitors na DC-link capacitors. Isiokwu a ga-ekewa ụzọ abụọ.

Site na mmepe nke ụlọ ọrụ ike ọhụrụ, a na-ejikarị teknụzụ ugbu a agbanwe agbanwe eme ihe dịka o kwesịrị, DC-Link capacitors dịkwa mkpa karịsịa dị ka otu n'ime ngwaọrụ dị mkpa maka nhọrọ. DC-Link capacitors na nzacha DC na-achọkarị nnukwu ikike, nhazi ugbu a dị elu na nnukwu voltaji, wdg. Site n'ịtụnyere njirimara nke capacitors fim na electrolytic capacitors na inyocha ngwa ndị metụtara ya, akwụkwọ a na-ekwubi na na nhazi sekit chọrọ nnukwu voltaji ọrụ, nnukwu ripple current (Irms), ihe achọrọ n'elu voltaji, mgbanwe voltaji, nnukwu inrush current (dV/dt) na ogologo ndụ. Site na mmepe nke teknụzụ nkwụnye vapor metalized na teknụzụ capacitor film, capacitors film ga-aghọ usoro maka onye na-emepụta ihe iji dochie electrolytic capacitors n'ihe gbasara arụmọrụ na ọnụahịa n'ọdịnihu.

Site na iwebata amụma ọhụrụ metụtara ike na mmepe nke ụlọ ọrụ ike ọhụrụ na mba dị iche iche, mmepe nke ụlọ ọrụ ndị metụtara ya n'ọhịa a ewetala ohere ọhụrụ. Na capacitors, dịka ụlọ ọrụ ngwaahịa dị mkpa metụtara elu, enwetawokwa ohere mmepe ọhụrụ. Na ike ọhụrụ na ụgbọ ala ike ọhụrụ, capacitors bụ ihe dị mkpa na njikwa ike, njikwa ike, inverter ike na sistemụ mgbanwe DC-AC nke na-ekpebi ndụ nke onye na-agbanwe. Agbanyeghị, na inverter, a na-eji ike DC dị ka isi iyi ike ntinye, nke ejikọtara na inverter site na bọs DC, nke a na-akpọ DC-Link ma ọ bụ nkwado DC. Ebe ọ bụ na inverter na-enweta nnukwu RMS na oke ọkụ eletrik site na DC-Link, ọ na-emepụta nnukwu voltaji pulse na DC-Link, na-eme ka ọ sie ike maka inverter iguzogide. Ya mere, achọrọ capacitor DC-Link iji nabata nnukwu ọkụ eletrik site na DC-Link ma gbochie nnukwu mgbanwe voltaji pulse nke inverter dị n'ime oke a na-anabata; n'aka nke ọzọ, ọ na-egbochikwa inverters ka ha ghara imetụta oke voltaji na oke voltaji oge na DC-Link.

E gosiri eserese atụmatụ nke ojiji nke DC-Link capacitors na ike ọhụrụ (gụnyere mmepụta ike ifufe na mmepụta ike fotovoltaic) na sistemụ draịva ụgbọala ike ọhụrụ na Foto 1 na 2.

Foto nke 1 na-egosi topology sekit mgbanwe ike ikuku, ebe C1 bụ DC-Link (a na-ejikọta ya na modulu), C2 bụ nnabata IGBT, C3 bụ nzacha LC (akụkụ netwọk), na nzacha akụkụ rotor C4 DV/DT. Foto nke 2 na-egosi teknụzụ sekit mgbanwe ike PV, ebe C1 bụ nzacha DC, C2 bụ nzacha EMI, C4 bụ DC-Link, C6 bụ nzacha LC (akụkụ grid), C3 bụ nzacha DC, na C5 bụ nnabata IPM/IGBT. Foto nke 3 na-egosi sistemụ draịva moto bụ isi na sistemụ ụgbọ ala ike ọhụrụ, ebe C3 bụ DC-Link na C4 bụ capacitor nnabata IGBT.

N'ime ngwa ike ọhụrụ e kwuru n'elu, a chọrọ DC-Link capacitors, dị ka ngwaọrụ dị mkpa, maka ntụkwasị obi dị elu na ndụ ogologo oge na sistemụ mmepụta ike ifufe, sistemụ mmepụta ike fotovoltaic na sistemụ ụgbọ ala ike ọhụrụ, yabụ nhọrọ ha dị oke mkpa. Ihe na-esonụ bụ ntụnyere nke njirimara nke capacitors fim na capacitors electrolytic na nyocha ha na ngwa capacitor DC-Link.

1. Ntụnyere atụmatụ

1.1 Ihe mkpuchi ihe nkiri

E bu ụzọ webata ụkpụrụ nke teknụzụ metallize ihe nkiri: a na-ekupụ ihe mkpuchi ígwè dị gịrịgịrị n'elu ihe nkiri dị gịrịgịrị. Ọ bụrụ na e nwere ntụpọ n'ime ihe nkiri ahụ, ihe mkpuchi ahụ nwere ike ịpụpụ ma si otú a kewapụ ebe ahụ nwere ntụpọ maka nchebe, ihe a maara dị ka ọgwụgwọ onwe onye.

Foto nke 4 na-egosi ụkpụrụ nke mkpuchi metallisation, ebe a na-agwọ ihe nkiri dị gịrịgịrị (corona ma ọ bụghị ya) tupu vaporization ka molekul ígwè wee rapara na ya. A na-agbaze ígwè ahụ site na ịgbaze na okpomọkụ dị elu n'okpuru oghere (1400℃ ruo 1600℃ maka aluminom na 400℃ ruo 600℃ maka zinc), na vepo ígwè ahụ na-agbakọta n'elu ihe nkiri ahụ mgbe ọ zutere ihe nkiri ahụ jụrụ oyi (okpomọkụ oyi fim -25℃ ruo -35℃), si otú a na-emepụta mkpuchi ígwè. Mmepe nke teknụzụ metallisation emeela ka ike dielectric nke fim ahụ ka mma kwa ọkpụrụkpụ otu, na nhazi nke capacitor maka ntinye pulse ma ọ bụ mwepụ nke teknụzụ akọrọ nwere ike iru 500V/µm, na nhazi nke capacitor maka ojiji nzacha DC nwere ike iru 250V/µm. DC-Link capacitor bụ nke ikpeazụ, dịka IEC61071 si kwuo maka ngwa eletrọniki ike capacitor nwere ike iguzogide oke voltaji siri ike karị, ma nwee ike iru voltaji a tụrụ aro ugboro abụọ.

Ya mere, onye ọrụ kwesịrị ịtụle naanị voltaji ọrụ achọrọ maka imewe ha. Ihe mkpuchi ihe nkiri metallized nwere obere ESR, nke na-enye ha ohere iguzogide nnukwu mmiri ọkụ; obere ESL na-emezu ihe achọrọ maka nhazi inductance dị ala nke inverters ma na-ebelata mmetụta oscillation na ugboro mgbanwe.

Ọdịdị nke ihe nkiri dielectric, ịdị mma nke mkpuchi metallisation, nhazi capacitor na usoro mmepụta na-ekpebi njirimara ọgwụgwọ onwe onye nke capacitors metallised. Ihe nkiri dielectric eji eme capacitors DC-Link emepụtara bụ ihe nkiri OPP.

A ga-ebipụta ihe dị n'isi nke 1.2 n'isiokwu nke izu na-abịa.