Ndemanga pa Topology ndi Control Applications za Medium-High Voltage Power Electronic Transformers II

2 Kusankha Kapangidwe Konse ka PET

Ma PET topologies amasiyana kwambiri. Kutengera kuchuluka kwa magawo osinthira mphamvu, amatha kugawidwa m'magulu a magawo amodzi, awiri, ndi atatu [7]. Kapangidwe ka magawo awiri kakuphatikizapo omwe ali ndi mabasi a DC amphamvu komanso otsika, monga momwe zasonyezedwera pa Chithunzi 1.

Mu ma PET a gawo limodzi (Chithunzi 1(a)), ma frequency apakati/apamwamba Chosinthira Chodzipatula imalumikiza ma converter a AC/AC mbali zonse ziwiri. Chosinthira cha AC/AC cha mbali yoyamba chimasintha voliyumu ya AC yolowera mu voliyumu ya AC yothamanga kwambiri, yomwe imalumikizidwa kudzera mu transformer kenako nkusinthidwa kukhala voliyumu ya AC yothamanga kwambiri ndi chosinthira cha AC/AC cha mbali yachiwiri. Ma PET a gawo limodzi ali ndi magawo ochepa osinthira komanso zigawo zochepa, magwiridwe antchito apamwamba, komanso mphamvu zambiri. Komabe, kusowa kwa basi ya DC kumapangitsa kuti ikhale yosayenera kugwiritsa ntchito ma gridi a AC/DC osakanikirana, ndipo kulamulira kochotsa mphamvu ndi kovuta.

Ma PET a magawo awiri ali ndi basi ya DC mbali ya voltage yapamwamba kapena yotsika. Topology kumbali imodzi ya transformer yodzipatula ikufanana ndi ya PET ya gawo limodzi, pomwe mbali inayo imalumikizana ndi basi ya DC kudzera mu ma AC/DC kapena ma DC/AC circuits (Chithunzi 1(c) ndi Chithunzi 1(d)). Ndi maulalo a DC okwera kapena otsika, ma PET a magawo awiri amatha kulumikizana ndi ma grid a DC apakatikati/apamwamba mbali ya voltage yayikulu kapena ku machitidwe a PV/storage mbali ya voltage yochepa. Komabe, mphamvu yogwira ntchito yomwe imasamutsidwa ndi otembenuza mbali zonse ziwiri za transformer yodzipatula imakhala yogwirizana kwambiri ndi magawo a inductance ya transformer. Kuphatikiza apo, DC bus capacitor imakumana ndi kusintha kwakukulu kwa voltage ya mizere iwiri, ndipo kusintha kwa mphamvu ya converter ndi kwakukulu [7], zomwe zimapangitsa kuti kuwongolera kukhale kovuta.

Ma PET a magawo atatu (Chithunzi 1(b)) ali ndi mabasi a DC mbali zonse ziwiri zamphamvu komanso zochepa. Mphamvu yamagetsi yolowera ya mzere wamagetsi imakonzedwa kukhala basi ya DC yamphamvu kwambiri kudzera mu kusintha kwa AC/DC, kusinthidwa kukhala mafunde a sikweya amagetsi apamwamba, kulumikizidwa kumbali yamagetsi otsika kudzera mu transformer yapakatikati/yapamwamba, kukonzedwanso kukhala basi ya DC yamagetsi otsika, ndipo pamapeto pake imasinthidwa kukhala magetsi amagetsi a mzere wamagetsi kudzera mu kusintha kwa DC/AC. Ma PET a magawo atatu amatha kulumikizana ndi machitidwe a DC amagetsi apamwamba komanso otsika. Kuwongolera gawo lililonse losinthira kumakhala kodziyimira pawokha, zomwe zimathandiza kugawa ndi kuwongolera ndalama. Komabe, magawo angapo osinthira amachititsa kuti pakhale kapangidwe kovuta kwambiri. Chifukwa cha kapangidwe ka magawo ambiri, ma PET a magawo atatu amafikira mosavuta kutsika mbali yamagetsi apamwamba ndikufanana mbali yamagetsi otsika, kukwaniritsa zosowa za kugwiritsa ntchito magetsi apakatikati/apamwamba. Chifukwa chake, ma topology a magawo atatu ndi omwe amagwiritsidwa ntchito kwambiri pakufufuza ndi kugwiritsa ntchito ma PET amagetsi apakatikati/apamwamba.

Kwa ma PET omwe amagwiritsidwa ntchito pamagetsi apakati/apamwamba, mbali yamagetsi otsika imakhala ndi magetsi otsika okhala ndi zoletsa zochepa zamagetsi a chipangizo. Mosiyana ndi zimenezi, gawo lokonzanso magetsi amphamvu komanso gawo lapakati lodzipatula limayang'anizana ndi magetsi okwera, zomwe zimapangitsa kuti pakhale zofunikira kwambiri pa ma topology a circuit ndi zipangizo. Kafukufuku amene alipo akuyang'ana mbali ziwiri: ① Ma topology atsopano ndi njira zowongolera ma PET amagetsi apakati/apamwamba kutengera ma voltage omwe alipo; ② Ma topology a PET ndi zowongolera pogwiritsa ntchito zipangizo zatsopano zamagetsi amphamvu, monga zida za 10kV SiC [8, 9]. Komabe, zipangizo za SiC zamagetsi amphamvu kwambiri zikadali mu gawo la kafukufuku ndi chitukuko cha labotale, ndipo zipangizo zamalonda sizingakwanitse kukwaniritsa zofunikira za magetsi. Chifukwa chake, ma topology ambiri okhala ndi ma module ambiri kapena amodzi amagwiritsidwa ntchito kukwaniritsa zofunikira za magetsi okwera. Ma topology wamba akuwonetsedwa mu Chithunzi 2, chomwe chasanthulidwa mu Gawo 3.