A wannan makon za mu yi nazari kan amfani da na'urorin fim maimakon na'urorin lantarki masu amfani da wutar lantarki a cikin na'urorin DC-link. Za a raba wannan labarin zuwa sassa biyu.

Tare da haɓaka sabuwar masana'antar makamashi, ana amfani da fasahar canjin yanayi akai-akai daidai gwargwado, kuma capacitors na DC-Link suna da mahimmanci musamman a matsayin ɗaya daga cikin manyan na'urori don zaɓi. Capacitors na DC-Link a cikin matatun DC gabaɗaya suna buƙatar babban ƙarfin aiki, babban sarrafa wutar lantarki da babban ƙarfin lantarki, da sauransu. Ta hanyar kwatanta halayen capacitors na fim da capacitors na electrolytic da kuma nazarin aikace-aikacen da suka shafi, wannan takarda ta kammala da cewa a cikin ƙirar da'ira da ke buƙatar babban ƙarfin lantarki mai aiki, babban ƙarfin ripple (Irms), buƙatun over-voltage, juyawar wutar lantarki, babban ƙarfin inrush (dV/dt) da tsawon rai. Tare da haɓaka fasahar adana tururi mai ƙarfe da fasahar capacitor na fim, capacitors na fim za su zama yanayi ga mai ƙira don maye gurbin capacitors na electrolytic dangane da aiki da farashi a nan gaba.

Tare da gabatar da sabbin manufofi masu alaƙa da makamashi da kuma haɓaka sabbin masana'antar makamashi a ƙasashe daban-daban, ci gaban masana'antu masu alaƙa a wannan fanni ya kawo sabbin damammaki. Kuma capacitors, a matsayin muhimmin masana'antar samfura masu alaƙa da sama, sun kuma sami sabbin damammaki na ci gaba. A cikin sabbin motocin makamashi da sabbin motocin makamashi, capacitors sune manyan abubuwan da ke cikin sarrafa makamashi, sarrafa wutar lantarki, inverter wutar lantarki da tsarin juyawa na DC-AC waɗanda ke ƙayyade tsawon rayuwar mai juyawa. Duk da haka, a cikin inverter, ana amfani da wutar DC a matsayin tushen wutar lantarki, wanda aka haɗa da inverter ta hanyar bas ɗin DC, wanda ake kira DC-Link ko tallafin DC. Tunda inverter yana karɓar babban RMS da kwararar bugun jini daga DC-Link, yana haifar da babban ƙarfin lantarki akan DC-Link, wanda ke sa ya yi wa inverter wahala. Saboda haka, ana buƙatar capacitor DC-Link don shan babban ƙarfin lantarki daga DC-Link kuma hana babban canjin ƙarfin lantarki na inverter yana cikin kewayon da aka yarda; a gefe guda kuma, yana hana inverters su sha wahala daga overshoot na ƙarfin lantarki da over-voltage na wucin gadi akan DC-Link.

An nuna zane-zanen amfani da na'urorin DC-Link a cikin sabon makamashi (gami da samar da wutar lantarki ta iska da samar da wutar lantarki ta photovoltaic) da sabbin tsarin tuƙi na motocin makamashi a cikin Hoto na 1 da 2.

Hoto na 1 yana nuna yanayin da'irar mai canza wutar lantarki ta iska, inda C1 shine DC-Link (gabaɗaya an haɗa shi da module), C2 shine sha IGBT, C3 shine tace LC (gefen net), da kuma matattarar DV/DT ta gefen rotor na C4. Hoto na 2 yana nuna fasahar da'irar mai canza wutar lantarki ta PV, inda C1 shine tace DC, C2 shine tace EMI, C4 shine DC-Link, C6 shine tace LC (gefen grid), C3 shine tace DC, kuma C5 shine sha IPM/IGBT. Hoto na 3 yana nuna babban tsarin tuƙi na mota a cikin sabon tsarin motar makamashi, inda C3 shine DC-Link kuma C4 shine capacitor sha IGBT.

A cikin sabbin aikace-aikacen makamashi da aka ambata a sama, ana buƙatar na'urorin DC-Link, a matsayin babbar na'ura, don ingantaccen aminci da tsawon rai a cikin tsarin samar da wutar lantarki ta iska, tsarin samar da wutar lantarki ta photovoltaic da sabbin tsarin motocin makamashi, don haka zaɓin su yana da mahimmanci musamman. Ga kwatancen halayen na'urorin fim da na'urorin electrolytic da kuma nazarin su a cikin aikace-aikacen na'urorin DC-Link.

1. Kwatanta fasali

1.1 Filayen wutar lantarki

An fara gabatar da ƙa'idar fasahar ƙara ƙarfe ta fim: ana tururin ƙarfe mai ƙanƙantar da ya isa ya yi tururi a saman siririn fim ɗin. Idan akwai lahani a cikin matsakaiciyar, Layer ɗin zai iya ƙafewa don haka ya ware wurin da ke da lahani don kariya, wani abu da aka sani da warkar da kansa.

Hoto na 4 ya nuna ƙa'idar shafa ƙarfe, inda siririn fim ɗin da aka riga aka yi wa magani (corona ko wanin haka) kafin a yi amfani da shi don ƙwayoyin ƙarfe su manne da shi. Ana fitar da ƙarfen ta hanyar narkewa a zafin jiki mai yawa a ƙarƙashin injin (1400℃ zuwa 1600℃ don aluminum da 400℃ zuwa 600℃ don zinc), kuma tururin ƙarfe yana taruwa a saman fim ɗin lokacin da ya haɗu da fim ɗin da aka sanyaya (zafin sanyaya fim -25℃ zuwa -35℃), don haka yana samar da murfin ƙarfe. Ci gaban fasahar haɗa ƙarfe ya inganta ƙarfin dielectric na fim ɗin dielectric a kowace kauri, kuma ƙirar capacitor don amfani da bugun jini ko fitarwa na fasahar busasshiyar na iya kaiwa 500V/µm, kuma ƙirar capacitor don aikace-aikacen matattarar DC na iya kaiwa 250V/µm. DC-Link capacitor na ƙarshen ne, kuma bisa ga IEC61071 don amfani da na'urorin lantarki na wutar lantarki capacitor na iya jure girgizar wutar lantarki mai tsanani, kuma yana iya kaiwa sau biyu na ƙarfin lantarki da aka ƙididdige.

Saboda haka, mai amfani yana buƙatar kawai ya yi la'akari da ƙimar ƙarfin aiki da ake buƙata don ƙirarsa. Na'urorin ɗaukar fim ɗin ƙarfe suna da ƙarancin ESR, wanda ke ba su damar jure manyan kwararar ruwa; ƙarancin ESL ya cika buƙatun ƙirar inductance na inverters kuma yana rage tasirin juyawa a lokacin sauyawar mita.

Ingancin fim ɗin dielectric, ingancin murfin ƙarfe, ƙirar capacitor da tsarin masana'anta suna ƙayyade halayen warkar da kai na capacitors masu ƙarfe. Fim ɗin dielectric da ake amfani da shi don capacitors DC-Link da aka ƙera galibi fim ne na OPP.

Za a buga abubuwan da ke cikin babi na 1.2 a cikin labarin mako mai zuwa.