Sabata ino tisanthula kugwiritsa ntchito ma capacitor amafilimu m'malo mwa ma electrolytic capacitors mu DC-link capacitors.Nkhaniyi igawidwa m’magawo awiri.

Ndi chitukuko cha mafakitale amagetsi atsopano, teknoloji yamakono yosinthika imagwiritsidwa ntchito moyenerera, ndipo ma capacitor a DC-Link ndi ofunika kwambiri ngati chimodzi mwa zipangizo zofunika kwambiri posankha.Ma capacitor a DC-Link mu zosefera za DC nthawi zambiri amafunikira mphamvu yayikulu, kukonza kwanthawi yayitali komanso voteji yapamwamba, ndi zina zambiri. Poyerekeza mawonekedwe a ma capacitor a filimu ndi ma electrolytic capacitors ndikuwunikanso ntchito zomwe zikugwirizana nazo, pepalali limamaliza kuti pamapangidwe ozungulira omwe amafunikira mphamvu yamagetsi yamagetsi, high ripple current (Irms), zofunikira zamagetsi opitilira muyeso, kusintha voteji, kuthamanga kwambiri kwapano (dV/dt) ndi moyo wautali.Ndi chitukuko cha ukadaulo wazitsulo wazitsulo ndi ukadaulo wa capacitor wamafilimu, ma capacitor amakanema adzakhala chizolowezi chosintha ma electrolytic capacitor potengera magwiridwe antchito ndi mtengo mtsogolo.

Ndi kukhazikitsidwa kwa ndondomeko zatsopano zokhudzana ndi mphamvu ndi chitukuko cha mafakitale atsopano a mphamvu m'mayiko osiyanasiyana, chitukuko cha mafakitale okhudzana ndi ntchitoyi chabweretsa mwayi watsopano.Ndipo ma capacitor, monga makampani ofunikira okhudzana ndi zinthu zakumtunda, apezanso mwayi watsopano wachitukuko.Mumagetsi atsopano ndi magetsi atsopano, ma capacitors ndi zigawo zofunika kwambiri pa kayendetsedwe ka mphamvu, kayendetsedwe ka mphamvu, inverter yamagetsi ndi machitidwe otembenuza a DC-AC omwe amatsimikizira moyo wa converter.Komabe, mu inverter, mphamvu ya DC imagwiritsidwa ntchito ngati gwero lamagetsi lolowera, lomwe limalumikizidwa ndi inverter kudzera mu basi ya DC, yomwe imatchedwa DC-Link kapena DC thandizo.Popeza inverter imalandira ma RMS apamwamba komanso mafunde apamwamba kwambiri kuchokera ku DC-Link, imapanga magetsi othamanga kwambiri pa DC-Link, zomwe zimapangitsa kuti inverter ikhale yovuta kupirira.Choncho, DC-Link capacitor imafunika kuti itenge mpweya wothamanga kwambiri kuchokera ku DC-Link ndikuletsa kusinthasintha kwamphamvu kwamagetsi kwa inverter ili mkati mwazovomerezeka;Kumbali inayi, imalepheretsanso ma inverters kuti asakhudzidwe ndi voltage overshoot ndi transient over-voltage pa DC-Link.

Chithunzi chojambula chakugwiritsa ntchito ma capacitor a DC-Link mu mphamvu zatsopano (kuphatikiza kupanga magetsi amphepo ndi kupanga magetsi a photovoltaic) ndi makina oyendetsa magalimoto amagetsi atsopano akuwonetsedwa pazithunzi 1 ndi 2.

Chithunzi 1 limasonyeza mphepo mphamvu converter dera topology, kumene C1 ndi DC-Link (zambiri Integrated kwa gawo), C2 ndi IGBT mayamwidwe, C3 ndi LC kusefa (ukonde mbali), ndi C4 rotor mbali DV/DT kusefa.Chithunzi 2 chikuwonetsa ukadaulo wosinthira mphamvu wa PV, pomwe C1 ndi kusefa kwa DC, C2 ndi kusefa kwa EMI, C4 ndi DC-Link, C6 ndi kusefa kwa LC (gridi mbali), C3 ndi kusefa kwa DC, ndipo C5 ndi mayamwidwe a IPM/IGBT.Chithunzi 3 chikuwonetsa njira yayikulu yoyendetsera galimoto mumagetsi atsopano amagetsi, pomwe C3 ndi DC-Link ndi C4 ndi IGBT mayamwidwe capacitor.

M'mapulogalamu atsopano omwe atchulidwa pamwambapa, ma capacitor a DC-Link, monga chipangizo chofunika kwambiri, amafunikira kuti akhale odalirika kwambiri komanso moyo wautali mu machitidwe opangira mphamvu za mphepo, machitidwe opangira mphamvu za photovoltaic ndi magetsi atsopano a galimoto, kotero kusankha kwawo n'kofunika kwambiri.Zotsatirazi ndi kuyerekezera makhalidwe a mafilimu capacitors ndi electrolytic capacitors ndi kusanthula kwawo mu DC-Link capacitor ntchito.

1.Kuyerekeza kwa mawonekedwe

1.1 Ma capacitor a kanema

Mfundo yaukadaulo waukadaulo waukadaulo wa filimu imayambitsidwa koyamba: chitsulo chocheperako chocheperako chimakhala ndi vaporized pamwamba pa filimu yopyapyala.Pamaso pa chilema mkatikati, wosanjikiza amatha kusungunuka ndipo motero amalekanitsa malo olakwika kuti atetezedwe, chodabwitsa chomwe chimadziwika kuti kudzichiritsa.

Chithunzi 4 chikuwonetsa mfundo ya zokutira zazitsulo, pomwe filimu yopyapyala imayikidwa kale (corona mwanjira ina) isanatenthedwe kuti mamolekyu achitsulo atsatire.Chitsulocho chimasungunuka ndi kusungunuka kutentha kwakukulu pansi pa vacuum (1400 ℃ mpaka 1600 ℃ kwa aluminiyamu ndi 400 ℃ mpaka 600 ℃ kwa nthaka), ndi nthunzi wachitsulo umasungunuka pamwamba pa filimuyo ikakumana ndi filimu yoziziritsa (kutentha kwa filimu kuzirala). -25 ℃ mpaka -35 ℃), motero kupanga zokutira zitsulo.Kukula kwaukadaulo waukadaulo wazitsulo kwathandizira mphamvu ya dielectric ya filimu ya dielectric pa makulidwe a unit, ndipo kapangidwe ka capacitor kwa kugunda kapena kutulutsa kugwiritsa ntchito ukadaulo wowuma kumatha kufikira 500V/µm, ndipo kapangidwe ka capacitor kwa DC fyuluta kugwiritsa ntchito kumatha kufikira 250V. /µm.DC-Link capacitor ndi yotsirizira, ndipo malinga ndi IEC61071 yamagetsi ogwiritsira ntchito magetsi amatha kupirira kugwedezeka kwakukulu kwamagetsi, ndipo amatha kufika 2 kuwirikiza voteji.

Chifukwa chake, wogwiritsa ntchito amangofunika kuganizira mphamvu yamagetsi yomwe ikufunika pakupanga kwawo.Ma capacitor opangidwa ndi zitsulo ali ndi ESR yochepa, yomwe imawalola kupirira mafunde akuluakulu othamanga;ESL yotsika imakwaniritsa zofunikira za mapangidwe otsika a ma inverters ndipo imachepetsa mphamvu ya oscillation pakusintha ma frequency.

Ubwino wa filimu ya dielectric, ubwino wa zokutira zazitsulo, mapangidwe a capacitor ndi kupanga mapangidwe amatsimikizira kudziletsa kwa ma capacitors a metallized.Ma dielectric a kanema omwe amagwiritsidwa ntchito pa DC-Link capacitors opangidwa makamaka ndi filimu ya OPP.

Zomwe zili m'mutu 1.2 zidzasindikizidwa m'nkhani ya sabata yamawa.