I-voltage kwicala le-DC yenkqubo yamandla elanga inyuswe ukuya kwi-1500V, kwaye ukukhuthazwa kunye nokusetyenziswa kweeseli ze-210 kubeka phambili iimfuno eziphezulu zokhuseleko lombane wenkqubo yonke ye-photovoltaic.Emva kokuba i-voltage yenkqubo inyusiwe, ibeka imingeni kwi-insulation kunye nokhuseleko lwenkqubo, kwaye yandisa umngcipheko wokuchithwa kwe-insulation yamacandelo, i-inverter wiring, kunye neesekethe zangaphakathi. iimpazamo ezihambelanayo zenzeka.
Ukuze ihambelane namacandelo ngokunyuka kwangoku, abavelisi be-inverter bandisa igalelo langoku lomtya ukusuka kwi-15A ukuya kwi-20A.Xa usombulula ingxaki ye-20A igalelo langoku, umenzi we-inverter ulungiselele ukuyila kwangaphakathi kwe-MPPT kunye nokwandisa ikhono lokufikelela kwintambo IMPPT ukuya kwisithathu okanye ngaphezulu. Kwimeko yempazamo, umtya unokuba nengxaki ye-backfeeding yangoku.Ukusombulula le ngxaki, i-DC switch enomsebenzi "wokuvala i-DC okrelekrele" kuye kwavela njengoko amaxesha afuna.
01 Umahluko phakathi kokutshintsha ukwahlula ngokwesiko kunye nokutshintsha okukrelekrele kweDC
Okokuqala, i-DC yemveli iswitshi yokwahlula inokwaphuka ngaphakathi kwinqanaba langoku, njenge-15A yegama, ngoko inokwaphula okwangoku phantsi kombane olinganisiweyo we-15A kunye nangaphakathi. , ngokuqhelekileyo ayikwazi ukuphula i-short-circuit current.
Umehluko omkhulu phakathi kokutshintshwa kwe-isolation kunye ne-circuit breaker kukuba i-circuit breaker inamandla okuphula i-short-circuit current, kwaye i-short-circuit current xa kukho impazamo inkulu kakhulu kunomlinganiselo olinganisiweyo we-breaker circuit. ;Ekubeni i-short-circuit current ye-photovoltaic side ye-DC idla ngokuphindaphindiweyo malunga ne-1.2 yangoku i-rerated current, ezinye ii-switch switches zodwa okanye izitshixo zomthwalo zinokwaphula i-short-circuit current ye-DC side.
Okwangoku, iswitshi ye-smart DC esetyenziswa yi-inverter, ukongeza ekuhlangabezaneni nesatifikethi se-IEC60947-3, ikwadibana nomthamo wokuqhekeka ogqithileyo womthamo othile, onokuphula impazamo engaphaya koluhlu lwangoku lwesekethe, ngokusebenzayo. isombulula ingxaki ye-backfeeding yangoku yomtya.Ngelo xesha, i-smart DC iswitshi idityaniswe ne-DSP ye-inverter, ukwenzela ukuba iyunithi yohambo yokutshintsha ikwazi ngokuchanekileyo kwaye iqonde imisebenzi efana nokukhuselwa kwe-overcurrent kunye nokukhusela isiphaluka esifutshane.
Umzobo weskimu sombane we-smart DC switch
I-02 Umgangatho woyilo lwenkqubo yelanga ifuna ukuba xa inani leendlela zokufaka iintambo phantsi kweMPPT nganye ≥3, ukukhuselwa kwe-fuse kufuneka kuqwalaselwe kwicala le-DC.Inzuzo yokusebenzisa ii-inverters zentambo kukusetyenziswa koyilo lwe-no-fuse ukunciphisa. ukusebenza kunye nokugcinwa komsebenzi wokutshintshwa rhoqo kwee-fuses kwicala le-DC.Abaguquli basebenzisa iiswitshi zeDC ezikrelekrele endaweni yeefuses.IMPPT inokufaka amaqela ama-3 eentambo.Ngaphantsi kweemeko eziphosakeleyo ezigqithiseleyo, kuya kubakho umngcipheko wokuba i-current ye-2 amaqela eentambo iya kubuyela kwi-1 iqela leentambo.Ngeli xesha, iswitshi yeDC ekrelekrele iya kuvula iswitshi yeDC ngokukhutshwa kwe-shunt kwaye uyikhuphe ngexesha.isiphaluka ukuqinisekisa ukususwa ngokukhawuleza iimpazamo.
Idayagram ecwangcisiweyo yeMPPT umtya wokubuyisela umva wangoku
Ukukhutshwa kwe-shunt ngokuyimfuneko yikhoyili ekhubekayo kunye nesixhobo sokukhubeka, esisebenzisa i-voltage echaziweyo kwikhoyili ekhubekayo, kwaye ngezenzo ezinje ngokutsalwa kwe-electromagnetic, i-DC switch actuator iyakhubeka ukuze ivule ibhuleki, kunye ne-shunt ukuyikhubekisa. isoloko isetyenziswa kulawulo olukude oluzenzekelayo oluzenzekelayo.Xa iswitshi ye-smart DC iqwalaselwe kwi-inverter ye-GoodWe, iswitshi ye-DC inokukhubeka kwaye ivulwe nge-inverter DSP ukukhulula isekethe yokutshintsha kwe-DC.
Kwi-inverters usebenzisa umsebenzi wokukhusela uhambo lwe-shunt, okokuqala kuyimfuneko ukuqinisekisa ukuba isiphaluka sokulawula i-coil ye-shunt ifumana amandla okulawula ngaphambi kokuba umsebenzi wokukhusela uhambo lwesiphaluka esiphambili unokuqinisekiswa.
03 Isicelo sethemba lokutshintsha okukrelekrele kwe-DC
Njengoko ukhuseleko lwecala le-DC photovoltaic ngokuthe ngcembe lifumana ingqwalasela engakumbi, imisebenzi yokhuseleko efana ne-AFCI kunye ne-RSD iye yakhankanywa ngakumbi nangakumbi ngoku.Xa impazamo isenzeka, iswitsha ye-smart DC inokusebenzisa ngokusebenzayo ulawulo olukude kunye nengqiqo yolawulo olupheleleyo lweswitch smart.Emva kwesenzo se-AFCI okanye se-RSD, i-DSP iya kuthumela isignali yohambo ukuze ihambe ngokuzenzekelayo iswitshi yokwahlula ye-DC DC.Yenza indawo yokuphumla ecacileyo ukuqinisekisa ukhuseleko lwabasebenzi bokulondoloza.Xa iswitshi ye-DC iphula umsinga omkhulu, iya kuchaphazela ubomi bombane bokutshintsha.Xa usebenzisa iswitshi ekrelekrele DC, ukwaphula kudla ubomi oomatshini kuphela iswitshi DC, nto leyo ikhusela ngokufanelekileyo ubomi bombane kunye arc ukucima isakhono sokutshintsha DC.
Ukusetyenziswa kweeswitshi ze-DC ezikrelekrele kwenza ukuba kube nokwenzeka ngokuthembekileyo "ukuvala isitshixo esinye" sezixhobo ze-inverter kwiimeko zasekhaya;Okwesibini, ngoyilo lokuvalwa kolawulo lwe-DSP, xa kukho imeko kaxakeka, i-DC switch ye-inverter inokukhawuleza kwaye uvale ngokuchanekileyo ngomqondiso we-DSP, ukwenza indawo ethembekileyo yokuqhawula isondlo.
04 Isishwankathelo
Ukusetyenziswa kokutshintsha okukrelekrele kwe-DC ikakhulu isombulula ingxaki yokhuseleko lwe-backfeeding yangoku, kodwa ukuba umsebenzi wokuhamba kude ungasetyenziswa kwezinye iimeko ezisasazwayo kunye nekhaya ukwenza umsebenzi othembekileyo kunye nokugcinwa kwesiqinisekiso kunye nokuphucula ukhuseleko lomsebenzisi kwiimeko ezingxamisekileyo.Ukukwazi ukujongana neziphene kusafuna ukusetyenziswa kunye nokuqinisekiswa kokutshintsha kwe-smart DC kushishino.
Ixesha lokuposa: Feb-16-2023