Kuleli sonto sizohlaziya ukusetshenziswa kwama-capacitor efilimu esikhundleni sama-capacitor e-electrolytic kuma-capacitor e-DC-link. Lesi sihloko sizohlukaniswa izingxenye ezimbili.

Ngokuthuthuka kwemboni yamandla amasha, ubuchwepheshe bamanje obuguquguqukayo buvame ukusetshenziswa ngokufanele, futhi ama-capacitor e-DC-Link abaluleke kakhulu njengenye yamadivayisi abalulekile okukhetha. Ama-capacitor e-DC-Link ezihlungini ze-DC ngokuvamile adinga umthamo omkhulu, ukucubungula kwamanje okuphezulu kanye ne-voltage ephezulu, njll. Ngokuqhathanisa izici zama-capacitor efilimu kanye nama-capacitor e-electrolytic nokuhlaziya izinhlelo zokusebenza ezihlobene, leli phepha liphetha ngokuthi ekwakhiweni kwesekethe okudinga i-voltage ephezulu yokusebenza, i-high ripple current (Irms), izidingo ze-over-voltage, ukuguqulwa kwe-voltage, i-high inrush current (dV/dt) kanye nokuphila isikhathi eside. Ngokuthuthuka kobuchwepheshe be-metallised vapor deposition kanye nobuchwepheshe be-capacitor yefilimu, ama-capacitor efilimu azoba umkhuba womklami wokufaka esikhundleni sama-capacitor e-electrolytic ngokwemisebenzi kanye nentengo esikhathini esizayo.

Ngokwethulwa kwezinqubomgomo ezintsha ezihlobene namandla kanye nokuthuthukiswa kwemboni entsha yamandla emazweni ahlukahlukene, ukuthuthukiswa kwezimboni ezihlobene kulo mkhakha kulethe amathuba amasha. Futhi ama-capacitor, njengemboni ebalulekile yemikhiqizo ehlobene ne-upstream, nawo athole amathuba amasha okuthuthukiswa. Ezimotweni ezintsha zamandla kanye nezamandla, ama-capacitor ayizingxenye ezibalulekile ekulawuleni amandla, ukuphathwa kwamandla, i-inverter yamandla kanye nezinhlelo zokuguqulwa kwe-DC-AC ezinquma impilo ye-converter. Kodwa-ke, ku-inverter, amandla e-DC asetshenziswa njengomthombo wamandla wokufaka, oxhunywe ku-inverter ngebhasi le-DC, elibizwa ngokuthi i-DC-Link noma ukwesekwa kwe-DC. Njengoba i-inverter ithola i-RMS ephezulu kanye nemisinga yokushaya kwe-peak evela ku-DC-Link, ikhiqiza i-voltage ephezulu yokushaya kwe-pulse ku-DC-Link, okwenza kube nzima nge-inverter ukumelana nayo. Ngakho-ke, i-capacitor ye-DC-Link iyadingeka ukuze imunce i-pulse current ephezulu evela ku-DC-Link futhi ivimbele ukuguquguquka kwe-voltage ephezulu yokushaya kwe-inverter kungaphakathi kwebanga elamukelekayo; ngakolunye uhlangothi, ivimbela futhi ama-inverter ukuthi athinteke yi-voltage overshoot kanye ne-transient over-voltage ku-DC-Link.

Umdwebo ochaza ukusetshenziswa kwama-capacitor e-DC-Link emandleni amasha (kufaka phakathi ukukhiqizwa kwamandla omoya kanye nokukhiqizwa kwamandla e-photovoltaic) kanye nezinhlelo zokushayela izimoto zamandla amasha ziboniswe kuZithombe 1 no-2.

Isibalo 1 sibonisa i-topology yesekethe yokuguqula amandla omoya, lapho i-C1 iyi-DC-Link (ngokuvamile ihlanganiswe ne-module), i-C2 iyi-absorption ye-IGBT, i-C3 iyi-LC filtering (uhlangothi olune-net), kanye ne-C4 rotor side filtering DV/DT. Isibalo 2 sibonisa ubuchwepheshe besekethe yokuguqula amandla e-PV, lapho i-C1 iyi-DC filtering, i-C2 iyi-EMI filtering, i-C4 iyi-DC-Link, i-C6 iyi-LC filtering (uhlangothi lwegridi), i-C3 iyi-DC filtering, kanye ne-C5 iyi-IPM/IGBT absorption. Isibalo 3 sibonisa uhlelo oluyinhloko lokushayela imoto ohlelweni olusha lwezimoto zamandla, lapho i-C3 iyi-DC-Link kanye ne-C4 iyi-IGBT absorption capacitor.

Kulezi zicelo zamandla ezintsha ezishiwo ngenhla, ama-capacitor e-DC-Link, njengedivayisi ebalulekile, ayadingeka ukuze kube nokuthembeka okuphezulu nokuphila isikhathi eside ezinhlelweni zokukhiqiza amandla omoya, izinhlelo zokukhiqiza amandla e-photovoltaic kanye nezinhlelo zezimoto ezintsha zamandla, ngakho-ke ukukhetha kwawo kubaluleke kakhulu. Okulandelayo ukuqhathanisa izici zama-capacitor efilimu nama-capacitor e-electrolytic kanye nokuhlaziywa kwawo ekusetshenzisweni kwe-capacitor ye-DC-Link.

1. Ukuqhathaniswa kwesici

1.1 Ama-capacitor efilimu

Isimiso sobuchwepheshe bokubumba insimbi yefilimu siqala ukwethulwa: ungqimba lwensimbi oluncane ngokwanele luyashiswa phezu kwe-media encane yefilimu. Uma kukhona isici endaweni, ungqimba luyakwazi ukuhwamuka ngaleyo ndlela luhlukanise indawo enesici ukuze luvikeleke, into eyaziwa ngokuthi ukuziphilisa.

Isithombe 4 sibonisa isimiso sokumbozwa kwensimbi, lapho imidiya yefilimu encane ilungiswa kusengaphambili (i-corona yolunye uhlobo) ngaphambi kokuhwamuka ukuze ama-molecule ensimbi akwazi ukunamathela kuyo. Insimbi iyahwamuka ngokuncibilika ekushiseni okuphezulu ngaphansi kwe-vacuum (1400℃ kuya ku-1600℃ ye-aluminium kanye no-400℃ kuya ku-600℃ ye-zinc), kanye nomhwamuko wensimbi ogoqene ebusweni befilimu uma uhlangana nefilimu epholile (izinga lokushisa lokupholisa ifilimu -25℃ kuya ku-35℃), ngaleyo ndlela kwakha ukumbozwa kwensimbi. Ukuthuthukiswa kobuchwepheshe bokumbozwa kwensimbi kuthuthukise amandla e-dielectric e-dielectric yefilimu ngeyunithi ngayinye, futhi ukwakheka kwe-capacitor yokusetshenziswa kwe-pulse noma ukukhipha ubuchwepheshe obomile kungafinyelela ku-500V/µm, kanye nokwakheka kwe-capacitor yokusetshenziswa kwesihlungi se-DC kungafinyelela ku-250V/µm. I-capacitor ye-DC-Link ingeyakamuva, futhi ngokusho kwe-IEC61071 yokusetshenziswa kwamandla kagesi i-capacitor ingamelana nokushaqeka okukhulu kwe-voltage, futhi ingafinyelela izikhathi ezimbili ze-voltage elinganisiwe.

Ngakho-ke, umsebenzisi udinga kuphela ukucabangela i-voltage yokusebenza ekaliwe edingekayo ekwakhiweni kwawo. Ama-capacitor efilimu anensimbi ane-ESR ephansi, ewavumela ukuthi amelane nemisinga emikhulu ye-ripple; i-ESL ephansi ihlangabezana nezidingo zomklamo we-inductance ephansi yama-inverters futhi inciphisa umphumela we-oscillation kuma-frequency okushintsha.

Ikhwalithi ye-dielectric yefilimu, ikhwalithi ye-metallization coating, ukwakheka kwe-capacitor kanye nenqubo yokukhiqiza kunquma izici zokuzilapha zama-capacitor ensimbi. I-dielectric yefilimu esetshenziselwa ama-capacitor e-DC-Link akhiqizwayo ikakhulukazi ifilimu ye-OPP.

Okuqukethwe kwesahluko 1.2 kuzoshicilelwa esihlokweni sangesonto elizayo.