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

2 PET Kev Xaiv Qauv Tag Nrho

Cov qauv PET sib txawv ntau heev. Raws li tus lej ntawm cov theem hloov pauv zog, lawv tuaj yeem faib ua ib theem, ob theem, thiab peb theem [7]. Cov qauv ob theem suav nrog cov uas muaj cov tsheb npav DC siab thiab qis, raws li pom hauv Daim Duab 1.

Hauv cov PET ib theem (Daim Duab 1 (a)), qhov nruab nrab / siab zaus Kev rho tawm Transformer txuas cov hloov pauv AC/AC rau ob sab. Lub hloov pauv AC/AC thawj zaug hloov kho qhov hluav taws xob AC ntawm kab-zaus mus rau hauv qhov hluav taws xob AC siab, uas tau txuas nrog lub transformer thiab tom qab ntawd hloov rov qab mus rau qhov hluav taws xob AC ntawm kab-zaus los ntawm lub hloov pauv AC/AC thib ob. Cov PET ib theem muaj tsawg dua theem hloov pauv thiab tsawg dua cov khoom, ua haujlwm tau zoo, thiab muaj zog ntau. Txawm li cas los xij, qhov tsis muaj lub tsheb npav DC ua rau lawv tsis haum rau cov kab sib xyaw AC/DC, thiab kev tswj hwm kev sib cais hluav taws xob yog qhov nyuaj.

Cov PET ob theem muaj lub tsheb npav DC ntawm sab siab lossis qis. Lub topology ntawm ib sab ntawm lub transformer cais zoo li ib theem PET, thaum sab tod txuas rau lub tsheb npav DC ntawm AC/DC lossis DC/AC circuits (Daim Duab 1(c) thiab Daim Duab 1(d)). Nrog rau cov kev sib txuas DC siab lossis qis, cov PET ob theem tuaj yeem txuas rau nruab nrab/siab-voltage DC grids ntawm sab siab-voltage lossis rau PV/storage systems ntawm sab qis-voltage. Txawm li cas los xij, lub zog nquag hloov los ntawm cov converters ntawm ob sab ntawm lub transformer cais yog rhiab heev rau cov kev hloov pauv inductance ntawm transformer. Tsis tas li ntawd, lub DC bus capacitor muaj kev hloov pauv voltage ob-kab zaus, thiab cov kev hloov pauv tam sim no ntawm lub converter loj heev [7], ua rau kev tswj hwm nyuaj.

Cov PET peb theem (Daim Duab 1(b)) muaj DC buses ntawm ob sab high-voltage thiab low-voltage. Cov input line-frequency AC tam sim no raug kho kom raug rau high-voltage DC bus ntawm AC/DC conversion, modulated rau hauv high-frequency square waves, txuas rau sab low-voltage ntawm lub medium/high-frequency transformer, kho kom raug rau low-voltage DC bus, thiab thaum kawg tig mus rau line-frequency AC voltage ntawm DC/AC conversion. Peb theem PETs tuaj yeem txuas rau ob qho tib si high-voltage DC systems. Kev tswj hwm ntawm txhua theem hloov pauv yog ywj pheej, pab txhawb kev sib cais thiab kev tswj hwm kev them nyiaj. Txawm li cas los xij, ntau theem hloov pauv ua rau muaj cov qauv nyuaj tshaj plaws. Vim yog qhov tsim ntau theem, peb theem PET topologies yooj yim ua tiav cascading ntawm sab high-voltage thiab paralleling ntawm sab low-voltage, ua tau raws li qhov xav tau ntawm nruab nrab/siab voltage daim ntawv thov. Yog li, peb theem topologies yog siv dav tshaj plaws hauv kev tshawb fawb thiab daim ntawv thov PET nruab nrab/siab voltage.

Rau cov PET hauv cov ntawv thov hluav taws xob nruab nrab/siab, sab qis-voltage muaj cov theem hluav taws xob qis nrog cov kev txwv hluav taws xob tsawg kawg nkaus. Qhov sib txawv, theem kho hluav taws xob siab thiab theem cais tawm nruab nrab ntsib cov theem hluav taws xob siab, ua rau muaj kev cai nruj dua rau cov khoom siv hluav taws xob thiab cov khoom siv. Kev tshawb fawb uas twb muaj lawm tsom mus rau ob qho kev taw qhia: ① Cov topologies tshiab thiab cov txheej txheem tswj hwm rau cov PETs nruab nrab/siab voltage raws li cov ntsuas hluav taws xob uas twb muaj lawm; ② PET topologies thiab kev tswj hwm siv cov khoom siv hluav taws xob siab tshiab, xws li 10kV SiC cov khoom siv [8, 9]. Txawm li cas los xij, cov khoom siv SiC siab-voltage tseem nyob hauv theem R&D hauv chav kuaj, thiab cov khoom siv lag luam tseem tsis tau ua tau raws li qhov xav tau hluav taws xob. Yog li ntawd, ntau-module cascaded lossis ib-module multilevel topologies siv los ua kom tau raws li qhov xav tau hluav taws xob nkag siab. Cov topologies ib txwm muaj nyob hauv Daim Duab 2, tshuaj xyuas hauv Ntu 3.