Amandla kagesi ohlangothini lwe-DC yesistimu yamandla elanga anyuselwa ku-1500V, futhi ukukhuthazwa nokusebenzisa amaseli angu-210 kubeka phambili izidingo eziphakeme zokuphepha kukagesi kulo lonke uhlelo lwe-photovoltaic.Ngemva kokuba i-voltage yesistimu inyusiwe, ibeka izinselele ekugxiliseni nasekuvikelekeni kwesistimu, futhi yandisa ingozi yokuhlukaniswa kwezingxenye, i-inverter wiring, namasekhethi angaphakathi.Lokhu kudinga izinyathelo zokuvikela ukuze kuhlukaniswe amaphutha ngesikhathi nangendlela ephumelelayo uma amaphutha ahambisanayo ayenzeka.
Ukuze ihambisane nezingxenye ezinokunyuka kwamanje, abakhiqizi be-inverter bakhulisa amandla okufakwayo kwentambo ukusuka ku-15A kuya ku-20A. Lapho kuxazulula inkinga ye-20A yamanje okokufaka, umkhiqizi womshini wokuguqula uguqule umklamo wangaphakathi we-MPPT futhi wandisa intambo yokufinyelela intambo I-MPPT ukuya kokuthathu noma ngaphezulu.Endabeni yephutha, intambo ingase ibe nenkinga ye-backfeeding yamanje.Ukuxazulula le nkinga, inkinobho ye-DC enomsebenzi "wokuvala shaqa okuhlakaniphile kwe-DC" kuye kwavela njengoba izikhathi zidinga.
01 Umehluko phakathi kweswishi yokuhlukanisa evamile kanye neswishi ye-DC ehlakaniphile
Okokuqala, isishicileli sokuhlukanisa se-DC sendabuko singagqashuka phakathi kwamandla amanje alinganiselwe, njenge-15A, bese sikwazi ukuphula amandla amanje ngaphansi kwe-voltage elinganiselwe engu-15A nangaphakathi. , ngokuvamile ayikwazi ukuphula i-short-circuit current.
Umehluko omkhulu phakathi kwe-switch ye-isolation kanye ne-circuit breaker ukuthi i-circuit breaker inamandla okuphula i-short-circuit current, kanti i-short-circuit current uma kwenzeka iphutha inkulu kakhulu kunezinga elilinganiselwe le-circuit breaker. ;Njengoba i-short-circuit current yohlangothi lwe-photovoltaic DC ivamise ukuba izikhathi ezingaba ngu-1.2 kunamanje olinganisiwe, amaswishi athile ahlukanisayo noma amaswishi okulayisha angakwazi futhi ukwephula i-short-circuit current yohlangothi lwe-DC.
Njengamanje, i-smart DC switch esetshenziswa i-inverter, ngaphezu kokuhlangabezana nesitifiketi se-IEC60947-3, iphinde ihlangabezane nomthamo wokuphuka ngokweqile womthamo othile, onganqamula iphutha elidlulele ngaphakathi kwebanga lamanje lesifunda esifushane, ngokuphumelelayo. ixazulula inkinga ye-string backfeeding yamanje.Ngesikhathi esifanayo, i-smart DC switch ihlanganiswa ne-DSP ye-inverter, ukuze iyunithi yohambo lweswishi ikwazi ukubona ngokunembile nangokushesha imisebenzi efana nokuvikela i-overcurrent kanye nokuvikela isifunda esifushane.
Umdwebo wohlelo lukagesi we-smart DC switch
02 Izinga lokuklama isistimu yelanga lidinga ukuthi lapho inani lamashaneli okokufaka ezintambo ngaphansi kwe-MPPT ngayinye lingu-≥3, ukuvikelwa kwe-fuse kufanele kulungiselelwe ohlangothini lwe-DC.Inzuzo yokusebenzisa iziguquli zezintambo ukusetshenziswa kwe-no-fuse design ukuze kuncishiswe. umsebenzi wokusebenza nowokugcina ushintshwa njalo amafuse ohlangothini lwe-DC.Iziguquli zisebenzisa amaswishi e-DC ahlakaniphile esikhundleni samafuse.I-MPPT ingafaka amaqembu angu-3 ezintambo.Ngaphansi kwezimo zephutha ezimbi kakhulu, kuzoba nengozi yokuthi i-current yamaqembu angu-2 wezintambo izogeleza ibuyele eqenjini elingu-1 lezintambo.Ngalesi sikhathi, iswishi ye-DC ehlakaniphile izovula iswishi ye-DC ngokukhishwa kwe-shunt futhi iyinqamule ngesikhathi.isifunda ukuqinisekisa ukususwa ngokushesha amaphutha.
Umdwebo wohlelo lweyunithi yezinhlamvu ye-MPPT yokuphakela emuva kwamanje
Ukukhishwa kwe-shunt empeleni kuyikhoyili ekhubekayo kanye nedivaysi ekhubekayo, esebenzisa amandla kagesi athile kukhoyili ekhubekayo, futhi ngezenzo ezinjengokudonsa kukagesi kagesi, i-DC switch actuator iyakhubeka ukuze uvule ibhuleki, futhi i-shunt iyayikhubeka. ivamise ukusetshenziswa kusilawuli sokuvala ugesi esizenzakalelayo esikude.Lapho iswishi ye-smart DC ilungiswa kusiguquli se-GoodWe, iswishi ye-DC ingawiswa futhi ivulwe ku-inverter DSP ukuze kunqanyulwe isekethe yeswishi ye-DC.
Kuma-inverter asebenzisa umsebenzi wokuvikela uhambo lwe-shunt, okokuqala kuyadingeka ukuqinisekisa ukuthi isiyingi sokulawula ikhoyili ye-shunt ithola amandla okulawula ngaphambi kokuba umsebenzi wokuvikela uhambo wesekethe enkulu uqinisekiswe.
03 Ithemba lesicelo sokushintshwa kwe-DC ehlakaniphile
Njengoba ukuphepha kohlangothi lwe-photovoltaic DC kuthola ukunakwa kancane kancane, imisebenzi yokuphepha efana ne-AFCI ne-RSD kukhulunywe ngayo kamuva nje.I-Smart DC switch ibaluleke ngokufanayo.Uma kwenzeka iphutha, iswishi ye-smart DC ingasebenzisa ngempumelelo isilawuli kude kanye nendlela yokulawula yonke yeswishi ehlakaniphile.Ngemva kwesenzo se-AFCI noma se-RSD, i-DSP izothumela isignali yohambo ukuze ihambe ngokuzenzakalelayo iswishi yokuhlukanisa ye-DC DC.Yakha indawo yokuphumula ecacile ukuze uqinisekise ukuphepha kwabasebenzi bokunakekela.Uma i-DC switch iphula i-current enkulu, izothinta impilo kagesi yeswishi.Uma usebenzisa iswishi ye-DC ehlakaniphile, ukuphuka kudla kuphela impilo yemishini yeswishi ye-DC, evikela ngempumelelo impilo kagesi kanye nekhono lokucisha i-arc leswishi ye-DC.
Ukusetshenziswa kokushintsha okuhlakaniphile kwe-DC futhi kwenza kube nokwenzeka "ukuvalwa kokhiye owodwa" ngokuthembekile kwemishini ye-inverter ezimweni zasendlini; Okwesibili, ngomklamo wokuvalwa kokulawula kwe-DSP, lapho kuvela isimo esiphuthumayo, ukushintshwa kwe-DC kwe-inverter kungaba ngokushesha futhi Vala ngokunembile ngesignali ye-DSP, kwakheka indawo ethembekile yokunqamula ukulungiswa.
04 Isifinyezo
Ukusetshenziswa kwamaswishi e-DC ahlakaniphile kuxazulula inkinga yokuvikela yokuphakela emuva kwamanje, kodwa noma ngabe umsebenzi wokuhamba uqhelile ungasetshenziswa kwezinye izimo ezisabalalisiwe nezasekhaya ukuze kwakhiwe isiqinisekiso esithembeke kakhudlwana sokusebenza nokugcinwa nokuthuthukisa ukuphepha komsebenzisi ezimeni eziphuthumayo.Ikhono lokubhekana namaphutha lisadinga ukusetshenziswa nokuqinisekiswa kwamaswishi e-smart DC embonini.
Isikhathi sokuthumela: Feb-16-2023