Covzog conversion system(PCS) yog qhov sib txuas ntawm lub roj teeb thiab daim phiaj hluav taws xob lossis AC load. Nws tsis tsuas yog txiav txim siab lub zog zoo thiab cov yam ntxwv zoo ntawm lub roj teeb lub zog cia qhov tso tawm, tab sis tseem cuam tshuam rau lub roj teeb kev nyab xeeb thiab kev ua neej. Raws li Circuit Court topology thiab transformer configuration, hom yooj yim ntawm PCS tuaj yeem muab faib ua fais fab -frequency step-up type thiab high-voltage direct-connection type, raws li qhia hauv daim duab.
Tam sim no, theem voltage ntawm cov pa roj teeb pawg tsis tshaj 1500V, thiab muaj qee qhov kev hloov pauv nyob ntawm lub xeev tus nqi (SOC). Yog li ntawd, kom hloov mus rau qhov kev xav tau ntawm qhov sib txawv ntawm cov kab hluav taws xob sib txawv lossis cov khoom thauj, lub zog zaus transformer feem ntau tau teeb tsa ntawm AC sab ntawm PCS (Power Conversion System). Qhov no tsis tsuas yog ua tiav AC voltage boosting los yog kev cai, tab sis kuj tso cai rau tsim ib tug peb -theem plaub-kab hlau nyob rau hauv off- kab sib chaws systems muab ib zaug -theem loads. Tsis tas li ntawd, nws txhim kho kev tiv thaiv thiab electromagnetic compatibility suppression ntawm lub zog cia system.
Raws li tus naj npawb ntawm theem, lub zog zaus theem- nce hom PCS tuaj yeem muab faib ua ib zaug -theem thiab ob npaug-theem topologies.
Lub hwj chim- theem zaus- nce ib zaug -theem PCS muaj kev ua haujlwm siab thiab cov qauv yooj yim; Txawm li cas los xij, nws raug kev txom nyem los ntawm cov roj teeb uas tsis muaj peev xwm thiab tsis tshua muaj kev hloov pauv hauv kev xaiv voltage. Tsis tas li ntawd, luv luv - Circuit Court txhaum ntawm DC sab ntawm PCS tuaj yeem yooj yim ua rau muaj hluav taws xob loj hauv pob roj teeb, ua rau muaj kev pheej hmoo loj. Tib-theem PCS kuj tuaj yeem faib ua ob-theem, peb-level, lossis ntau-theem systems raws li qhov tso zis voltage. Raws li tus naj npawb ntawm cov qib nce, DC voltage theem thiab tso zis hluav taws xob zoo ntawm PCS tuaj yeem txhim kho ntxiv, raws li qhia hauv daim duab.
Lub hwj chim -zaus boost- hom ob-theem PCS, raws li qhia hauv daim duab 2-22, tau teeb tsa nrog bidirectional DC / DC converter ntawm lub roj teeb input davhlau ya nyob twg, uas ua rau kom lub roj teeb pob muaj peev xwm thiab txhim kho qhov yooj yim ntawm kev xaiv hluav taws xob, thiab tuaj yeem ua tiav ntau lub roj teeb tswj kev ywj pheej. Txawm li cas los xij, nws muaj tus nqi siab, kev tswj xyuas qhov nyuaj, thiab kev ua haujlwm tsawg. Raws li cov qauv sib txawv ntawm DC / DC converter, ob -theem PCS tuaj yeem muab faib ua yam tsis yog- cais thiab cais tawm. Qhov kev sib cais ob-theem PCS tuaj yeem txhim kho qhov sib piv ntawm qhov hloov pauv hluav taws xob ntxiv thiab muaj lub roj teeb dav dua qhov hloov pauv tau, tab sis qhov tsim ntawm qhov loj- muaj peev xwm cais tau siab-boost ratio bidirectional DC / DC converter nthuav qhia cov kev sib tw tseem ceeb. Cov teeb meem tseem ceeb muaj xws li high-voltage transformer design, system insulation, phase-shift or series resonant soft switching, and high power density design.
Rau cov roj teeb lithium-ion roj teeb, uas feem ntau siv rau hauv loj - lub peev xwm ntawm lub zog cia, cov zis hluav taws xob tsis sib txawv heev thaum lub xeev them nqi (SOC) nyob rau hauv thaj tsam ntawm 15% txog 85%. Yog li ntawd, feem ntau loj - lub peev xwm cia lub zog tam sim no siv nyob rau hauv kuv lub teb chaws siv ib zaug xwb -theem zog hloov dua siab tshiab system (PCS). Txawm li cas los xij, raws li DC voltage nce mus txog 1500V, peb -theem topology qauv yuav raug siv ntau dua. Lub 1500V roj teeb lub zog cia qhov system txo qis qhov xav tau hneev taw thiab siv cov khoom siv hluav taws xob xws li hloov lub thawv thiab DC cables, yog li txo cov nqi hluav taws xob rau qee qhov. Txawm li cas los xij, vim qhov kev ncua deb ntawm lub roj teeb thiab PCS, nws tsis muaj qhov txo qis hauv DC kev sib kis tau ploj pom nyob rau hauv loj -scale photovoltaic fais fab nroj tsuag. Tsis tas li ntawd, nws tso cov kev xav tau ntau dua ntawm cov khoom xws li bidirectional DC Circuit Court breakers thiab bidirectional DC contactors. Kev ruaj ntseg hluav taws xob thiab kev tiv thaiv tsim ntawm DC Circuit Court yog ib qho kev sib tw tseem ceeb hauv kev siv cov kab ke no.
Txhawm rau kom siv ultra-loj- teev roj teeb lub zog cia chaw nres tsheb fais fab, thiab kom tsis txhob muaj kev sib txuas ntawm cov roj teeb ntau dhau, nrog rau kom tsis txhob poob los ntawm lub zog zaus transformers thiab txo cov nqi, siab -voltage direct- txuas PCS nrog lub modular cascaded qauv tau dhau los ua kev tshawb fawb loj. Zoo ib yam li lub zog zaus theem- nce PCS, siab -voltage ncaj- txuas PCS kuj tuaj yeem muab faib ua ib zaug -theem thiab ob-theem topologies raws li tus naj npawb ntawm lub zog hloov pauv theem.
Lub cascaded ib leeg -theem PCS tuaj yeem tso tawm qhov hluav taws xob siab yam tsis muaj lub hwj chim zaus transformer, ncaj qha txuas mus rau siab -voltage hluav taws xob daim phiaj, ua rau nws tsim nyog rau lub tsev ultra-loj- teev lub zog cia. Cov qauv cascaded ua tiav ntau- theem tso zis, ua kom cov zis hluav taws xob qis qis txawm tias tsis tshua muaj kev hloov pauv hauv ib tus qauv, yog li txo qis kev hloov pauv. Txawm li cas los xij, qhov cascaded ib leeg -theem PCS yuav tsum muaj kev sib nrig sib rwb thaiv tsev ntawm DC sab, ua rau muaj kev kub ntxhov siab rau cov zis hluav taws xob tsawg, tsim nyog tsim tshwj xeeb. Muaj ntau hom - hom tam sim no txoj hauv kev nruab nrab ntawm txhua pob roj teeb thiab hauv av, xav tau cov kev daws teeb meem rau ntau hom - hom kev tiv thaiv tam sim no.
Kev them nyiaj thiab tso tawm tam sim no ntawm cov pob roj teeb muaj qhov thib ob - harmonic ripple, uas cuam tshuam tsis zoo rau lub roj teeb txoj kev tam sim no thiab nce nqi. Cascaded ib leeg-theem PCSs tuaj yeem muab faib ua H-bridge cascaded thiab modular multilevel converter (MMC) cascaded hom, raws li qhia hauv daim duab.
Zuag qhia tag nrho, siab -voltage direct- kev sib txuas PCS (Power Conversion System) yog ib qho kev daws teeb meem tseem ceeb los daws cov teeb meem kev nyab xeeb thiab kev ua haujlwm tau los ntawm ultra- lub peev xwm loj ntawm lub zog cia. Txawm li cas los xij, nws tso cov kev xav tau kev rwb thaiv tsev siab ntawm ob lub roj teeb pob thiab cais DC / DC converter, uas txwv tsis pub nws siv dav thiab siv. Tsis tas li ntawd, muaj kev sib tw hauv kev sib koom ua ke, kev sib txuas hluav taws xob, thiab kev tsim kev nyab xeeb ntawm ultra- cov roj teeb muaj peev xwm loj.