Kule veki siza kuhlalutya ukusetyenziswa kwee-capacitors zefilimu endaweni ye-electrolytic capacitors kwi-DC-link capacitors.Eli nqaku liya kwahlulwa libe ngamacandelo amabini.

Ngophuhliso loshishino lwamandla amatsha, iteknoloji yangoku eguquguqukayo isetyenziswa ngokuqhelekileyo ngokufanelekileyo, kwaye i-DC-Link capacitors ibaluleke kakhulu njengenye yezixhobo eziphambili zokukhetha.I-DC-Link capacitors kwii-DC-Link filters zifuna ngokubanzi umthamo omkhulu, ukusetyenzwa okuphezulu kwangoku kunye nombane ophezulu, njl. Ngokuthelekisa iimpawu ze-filimi capacitors kunye ne-electrolytic capacitors kunye nokuhlalutya izicelo ezinxulumene nazo, eli phepha liqukumbela ukuba kuyilo lweesekethe ezifuna umbane ophezulu wokusebenza, i-ripple current ephezulu (i-Irms), iimfuno zombane ogqithileyo, ukuguqulwa kwamandla ombane, i-high inrush current (dV/dt) kunye nobomi obude.Ngophuhliso lwetekhnoloji yokubeka umphunga owenziwe ngesinyithi kunye netekhnoloji yefilimu ye-capacitor, ii-filimi capacitors ziya kuba ngumkhwa womyili wokutshintsha i-electrolytic capacitors ngokwentsebenzo kunye nexabiso kwixesha elizayo.

Ngokuziswa kwemigaqo-nkqubo emitsha enxulumene namandla kunye nophuhliso loshishino lwamandla amatsha kumazwe ahlukeneyo, uphuhliso lwamashishini anxulumeneyo kulo mmandla luzise amathuba amatsha.Kwaye ii-capacitors, njengeshishini elibalulekileyo elinxulumene nemveliso, nazo zifumene amathuba amatsha ophuhliso.Kumandla amatsha kunye neenqwelo zamandla amatsha, ii-capacitors zizinto eziphambili zokulawula amandla, ulawulo lwamandla, i-inverter yamandla kunye neenkqubo zokuguqulwa kwe-DC-AC ezigqiba ubomi bomguquli.Nangona kunjalo, kwi-inverter, amandla e-DC asetyenziswa njengomthombo wamandla wegalelo, oqhagamshelwe kwi-inverter ngebhasi ye-DC, ebizwa ngokuba yi-DC-Link okanye inkxaso ye-DC.Ekubeni i-inverter ifumana i-RMS ephezulu kunye ne-peak pulse currents kwi-DC-Link, ivelisa i-voltage ephezulu ye-pulse kwi-DC-Link, eyenza kube nzima ukuba inverter imelane.Ngoko ke, i-DC-Link capacitor iyadingeka ukuba ithathe i-pulse yangoku kwi-DC-Link kunye nokuthintela ukuguquguquka kwe-voltage ephezulu ye-inverter kuluhlu olwamkelekileyo;kwelinye icala, ikwathintela ii-inverters ukuba zingachatshazelwa yi-voltage overshoot kunye ne-transient over-voltage kwi-DC-Link.

Umzobo wokusetyenziswa kwe-DC-Link capacitors kumandla amatsha (kuquka ukuveliswa kwamandla omoya kunye nokuveliswa kwamandla e-photovoltaic) kunye neenkqubo ezintsha zokuqhuba isithuthi samandla ziboniswe kwiMizobo 1 kunye ne-2.

Umzobo we-1 ubonisa i-topology yesekethe yokuguqula amandla omoya, apho i-C1 yi-DC-Link (ngokubanzi idityaniswe kwimodyuli), i-C2 yi-IGBT yokufunxa, i-C3 yi-LC yokucoca (icala lomnatha), kunye ne-C4 rotor icala le-DV / DT lokucoca.Umzobo we-2 ubonisa iteknoloji ye-PV yokuguqula amandla esekethe, apho i-C1 i-DC yokucoca, i-C2 i-EMI filtering, i-C4 yi-DC-Link, i-C6 i-LC filtering (i-grid side), i-C3 yi-DC filtering, kunye ne-C5 i-IPM / IGBT yokufunxa.Umzobo we-3 ubonisa eyona ndlela iphambili yokuqhuba imoto kwinkqubo entsha yesithuthi samandla, apho i-C3 i-DC-Link kunye ne-C4 yi-IGBT yokufunxa i-capacitor.

Kwizicelo zamandla ezintsha ezikhankanywe ngasentla, i-DC-Link capacitors, njengesixhobo esibalulekileyo, iyadingeka ukuthembeka okuphezulu kunye nobomi obude kwiinkqubo zokuvelisa amandla omoya, iinkqubo zokuvelisa amandla e-photovoltaic kunye neenkqubo ezintsha zezithuthi zamandla, ngoko ke ukhetho lwabo lubaluleke kakhulu.Oku kulandelayo kukuthelekiswa kweempawu zefilimu kunye ne-electrolytic capacitors kunye nohlalutyo lwabo kwi-DC-Link capacitor application.

1.Uthelekiso lweempawu

1.1 Iikhampasi zefilimu

Umgaqo weteknoloji ye-metalization yefilimu yaziswa kuqala: umaleko obhityileyo owaneleyo wesinyithi ufunxiwe kumphezulu weendaba zefilimu ezibhityileyo.Xa kukho isiphene kwi-medium, umaleko uyakwazi ukuphuphuma kwaye ngaloo ndlela uhlukanise indawo enesiphene yokukhusela, into eyaziwa ngokuba yi-self-healing.

Umzobo we-4 ubonisa umgaqo wokugquma i-metallization, apho i-media yefilimu encinci ifakwe ngaphambili (i-corona ngenye indlela) ngaphambi kokuba i-vaporization ukuze ii-molecule zetsimbi zibambelele kuyo.Intsimbi iyajika ibe ngumphunga ngokunyibilika kubushushu obuphezulu phantsi kwevacuum (1400℃ ukuya kwi-1600℃ ye-aluminiyam kunye ne-400℃ ukuya ku-600℃ ye-zinc), kwaye umphunga wesinyithi ujiya kumphezulu wefilimu xa idibana nefilimu epholileyo (iqondo lobushushu lokupholisa ifilimu. -25 ℃ ukuya -35 ℃), ngaloo ndlela yenza i-coating yentsimbi.Uphuhliso lwetekhnoloji ye-metallization iphucule amandla e-dielectric yefilimu ye-dielectric ubukhulu beyunithi nganye, kunye noyilo lwe-capacitor ye-pulse okanye ukukhutshwa kokusetyenziswa kobuchwephesha obomileyo kunokufikelela kwi-500V / µm, kunye noyilo lwe-capacitor ye-DC yesicelo sokucoca inokufikelela kwi-250V. /µm.I-DC-Link capacitor yeyokugqibela, kwaye ngokutsho kwe-IEC61071 yecapacitor yesicelo se-elektroniki inokumelana nomothuko onzima wombane, kwaye inokufikelela kumaxesha ama-2 ombane olinganisiweyo.

Ke ngoko, umsebenzisi kufuneka athathele ingqalelo kuphela amandla ombane osebenzayo afunekayo kuyilo lwabo.I-metallized film capacitors ine-ESR ephantsi, ebavumela ukuba bamelane nemisinga emikhulu ye-ripple;i-ESL ephantsi ihlangabezana neemfuno zoyilo oluphantsi lwe-inductance yee-inverters kwaye inciphisa umphumo we-oscillation ekutshintsheni ama-frequencies.

Umgangatho wefilimu ye-dielectric, umgangatho we-metallization coating, i-capacitor design kunye nenkqubo yokuvelisa imisela iimpawu zokuziphilisa ze-capacitors ze-metalized.Ifilimu ye-dielectric esetyenziselwa i-DC-Link capacitors eyenziwe yifilimu ye-OPP.

Umxholo wesahluko 1.2 uya kupapashwa kwinqaku leveki ezayo.