Kev Tshuaj Xyuas Txog Topology Thiab Kev Tswj Xyuas Cov Kev Siv ntawm Medium-High Voltage Power Electronic Transformers III

3.3 Clamped Multilevel Topology

Cov topology ntau theem ntawm Neutral Point Clamped (NPC) tau qhia. Ntxiv rau qhov diode-clamped NPC topology, NPC topology kuj suav nrog hom capacitor ya thiab hom hybrid clamped, thiab lwm yam. Txawm li cas los xij, vim muaj cov capacitor loj, NPC topology feem ntau tseem siv cov khoom siv hloov pauv passive lossis active rau clamping. Piv txwv li, siv diode-clamped multilevel topology, hauv peb-theem rectifier theem topology, txhua ceg theem muaj cov transistors hloov pauv cascaded thiab clamping diodes, txuas nrog parallel rau ib lub tsheb npav DC siab. Cov ntawv sau tau hais txog ib theem PET topology nrog theem rectifier siv plaub-theem diode-clamped circuit. Ib lub tsheb npav DC siab voltage ib zaug raug ua raws li input-series-output-parallel DABs, raws li tau qhia. Cov topology no tuaj yeem nthuav dav mus rau hauv peb-theem qauv, thiab tus lej ntawm cov theem voltage tuaj yeem hloov pauv raws li cov khoom siv tiv taus cov theem voltage thiab cov theem voltage sab siab. Ib yam li MMC topology, NPC topology kuj tseem tuaj yeem siv rau hauv theem cais tawm, txuas lub tsheb npav DC siab voltage rau Kev rho tawm Transformer, raws li tau qhia. Cov ntaub ntawv tau siv lub diode-clamped NPC converter peb-theem rau sab high-voltage ntawm LLC resonant converter, txheeb xyuas nws ntawm 166kW/2kV ~ 400V prototype. Cov ntaub ntawv tau siv lub voj voog NPC peb-theem diode-clamped rau peb-theem DAB, ua tiav qhov zoo tagnrho DAB voltage thiab tam sim no.

Thaum NPC topology siv ua theem rectifier, nws tsis xav tau cov tsheb npav DC cais tawm, txo cov naj npawb ntawm cov transformers cais tawm. Ntxiv mus, hauv cov qauv peb-theem, tsis muaj ob-kab-zaus voltage ripple ntawm lub tsheb npav. Txawm li cas los xij, vim tias clamped topology xav tau ntau tus clamping devices, tus naj npawb ntawm clamping devices nce ntxiv raws li tus naj npawb ntawm cov theem nce, ua rau qib nthuav dav nyuaj thiab redundancy nyuaj rau ua tiav. Hauv kev tswj hwm, cov dej ntws mus rau hauv txhua lub tsheb npav capacitor ntawm NPC converter yog txawv, ua rau capacitor voltage tsis sib npaug. Rau NPC topology saum peb theem, tsis muaj qhov ntsuas voltage zoo. Ntxiv mus, lub sijhawm ua haujlwm tsis sib xws ntawm cov hloov pauv hauv thiab sab nraud caj npab ua rau muaj cua sov tsis sib xws, uas tsuas yog daws tau los ntawm kev hloov pauv tag nrho lub voj voog topology.

Qhov teeb meem ntau yam uas tshwm sim los ntawm kev nthuav dav txhais tau tias NPC topologies tsuas yog siv tau rau hauv qib nruab nrab / siab voltage los ntawm kev sib txuas ntawm cov khoom siv lossis kev siv cov khoom siv SiC siab-voltage. Txawm li cas los xij, ntawm qib voltage qis dua, piv rau ib qho H-bridge topology, peb-theem NPC tsuas muaj ib nrab ntawm qhov voltage withstand thiab voltage stress ntawm txhua lub switching transistor, thaum tso tawm ntau theem voltage, ua rau cov kev xav tau lim dej tso zis qis dua. Nws muaj cov txiaj ntsig zoo ntawm daim ntawv thov ua theem inverter ntawm sab qis-voltage ntawm PET. Piv txwv li, cov ntaub ntawv siv peb-theem diode-clamped NPC ua theem inverter ntawm PET los tsav lub cev muaj zog peb-theem, ua qhov kev sim thiab ua tiav kev ua haujlwm tsav tsheb zoo thiab kev ua suab nrov.