Isibuyekezo mayelana ne-Topology kanye ne-Control Applications ze-Medium-High Voltage Power Electronic Transformers II

Ukukhethwa Kwesakhiwo Esiphelele Se-PET 2

Izinhlobo ze-PET ziyahlukahluka kakhulu. Ngokusekelwe enanini lezigaba zokuguqulwa kwamandla, zingahlukaniswa ngezinhlobo zesigaba esisodwa, ezimbili, kanye nezigaba ezintathu [7]. Izakhiwo zesigaba ezimbili zifaka phakathi lezo ezinamabhasi e-DC ane-voltage ephezulu kanye ne-voltage ephansi, njengoba kuboniswe ku-Figure 1.

Kuma-PET esigaba esisodwa (Umfanekiso 1(a)), imvamisa ephakathi nendawo/ephezulu Isiguquli Sokuzihlukanisa ixhumanisa abaguquli be-AC/AC kuzo zombili izinhlangothi. Isiguquli se-AC/AC esiseceleni esiyinhloko siguqula i-voltage ye-AC yomugqa wokufaka ibe yi-voltage ye-AC evame kakhulu, ehlanganiswa nge-transformer bese iguqulwa ibuyele ku-voltage ye-AC evame kakhulu yi-converter ye-AC/AC eseceleni kwesibili. Ama-PET esigaba esisodwa anezigaba ezimbalwa zokuguqulwa kanye nezingxenye ezimbalwa, ukusebenza kahle okuphezulu, kanye nobuningi bamandla aphezulu. Kodwa-ke, ukuntuleka kwebhasi le-DC kuwenza angafaneleki kumagridi e-AC/DC ahlanganisiwe, futhi ukulawula ukuhlukanisa amandla kuyinkimbinkimbi.

Ama-PET anezigaba ezimbili anebhasi le-DC ohlangothini olune-voltage ephezulu noma ephansi. I-topology ohlangothini olulodwa lwe-transformer yokuhlukanisa ifana neye-PET enesigaba esisodwa, kanti olunye uhlangothi luxhuma nebhasi le-DC ngezifunda ze-AC/DC noma ze-DC/AC (Isithombe 1(c) kanye nesithombe 1(d)). Ngezixhumanisi ze-DC ezine-voltage ephezulu noma ephansi, ama-PET anezigaba ezimbili angaxhuma kumagridi e-DC aphakathi nendawo/aphezulu ohlangothini olune-voltage ephezulu noma ezinhlelweni ze-PV/isitoreji ohlangothini olune-voltage ephansi. Kodwa-ke, amandla asebenzayo adluliselwa ngabaguquli kuzo zombili izinhlangothi ze-transformer yokuhlukanisa azwela kakhulu kumapharamitha okungenisa i-transformer okuvuza. Ngaphezu kwalokho, i-capacitor yebhasi le-DC ihlangabezana nokushintshashintsha okukhulu kwe-voltage yemigqa emibili, futhi ukushintshashintsha kwamanje kwe-converter kukhulu [7], okwenza ukulawula kube nzima.

Ama-PET anezigaba ezintathu (Umfanekiso 1(b)) anamabhasi e-DC kuzo zombili izinhlangothi ezine-voltage ephezulu nephansi. Umshini we-AC ongenayo ulungiswa ube yibhasi le-DC eline-voltage ephezulu ngokuguqulwa kwe-AC/DC, uguqulwe ube amagagasi esikwele ane-frequency ephezulu, uhlanganiswe nohlangothi lwe-voltage ephansi nge-transformer ephakathi nendawo/ephezulu, ulungiswe ube yibhasi le-DC eline-voltage ephansi, bese ekugcineni uguqulwa ube yi-voltage ye-AC ene-voltage ephansi ngokuguqulwa kwe-DC/AC. Ama-PET anezigaba ezintathu angaxhuma kokubili izinhlelo ze-DC ezine-voltage ephezulu nephansi. Ukulawulwa kwesigaba ngasinye sokuguqulwa kuzimele, okwenza kube lula ukuhlukanisa kanye nokulawula isinxephezelo. Kodwa-ke, izigaba eziningi zokuguqulwa ziholela esakhiweni esiyinkimbinkimbi kakhulu. Ngenxa yomklamo wezigaba eziningi, i-topology ye-PET enezigaba ezintathu ifinyelela kalula ukuhla kohlangothi lwe-voltage ephezulu kanye nokuhambisana nohlangothi lwe-voltage ephansi, ihlangabezana nezidingo zohlelo lokusebenza lwe-voltage ephakathi nendawo/ephezulu. Ngakho-ke, i-topology yezigaba ezintathu yizona ezisetshenziswa kakhulu ocwaningweni nasekusetshenzisweni kwe-PET ene-voltage ephakathi nendawo/ephezulu.

Kuma-PET ekusetshenzisweni kwamandla kagesi aphakathi nendawo/aphezulu, uhlangothi olune-voltage ephansi lunamazinga e-voltage aphansi anemikhawulo emincane ye-voltage yedivayisi. Ngokuphambene nalokho, isigaba sokulungisa amandla kagesi aphezulu kanye nesigaba sokuhlukaniswa esiphakathi sibhekene namazinga aphezulu e-voltage, okubeka izidingo eziqinile kuma-topology esekethe namadivayisi. Ucwaningo olukhona lugxile ezindleleni ezimbili: ① Ama-topology amasha kanye nezindlela zokulawula ama-PET e-voltage aphakathi nendawo/aphezulu ngokusekelwe ezilinganisweni ze-voltage yedivayisi ekhona; ② Ama-topology e-PET kanye nezilawuli ezisebenzisa amadivayisi amasha e-voltage aphezulu, njengamadivayisi e-10kV SiC [8, 9]. Kodwa-ke, amadivayisi e-SiC ane-voltage ephezulu asesesigabeni se-R&D selabhorethri, futhi amadivayisi ezentengiselwano awakwazi ukuhlangabezana nezidingo ze-voltage. Ngakho-ke, ama-topology amaningi ane-cascaded noma ama-module angu-single-level multilevel asetshenziselwa ukuhlangabezana nezidingo ze-voltage ephezulu yokufaka. Ama-topology ajwayelekile aboniswe ku-Figure 2, ahlaziywe ku-Section 3.