Kuma-inverter axhunywe kugridi ye-photovoltaic, kunezinhlaka eziningi zobuchwepheshe be-voltage: amandla kagesi aphezulu e-DC, ububanzi be-voltage esebenzayo ye-MPPT, ububanzi bomthamo ogcwele womthwalo, i-voltage eqalayo, i-voltage yokufakwayo elinganiselwe, i-voltage ephumayo, njll. Lezi zinhlaka zigxile kuzo futhi ziwusizo .Lesi sihloko sifingqa ezinye izinkinga ze-voltage zama-photovoltaic inverters ukuze zisetshenziswe futhi zishintshisane.
Q:I-voltage ephezulu ye-DC yokufaka
A:Ukukhawulela umkhawulo wevolthi yesekethe evulekile yeyunithi yezinhlamvu, kuyadingeka ukuthi umkhawulo ophezulu wevolthi yesekethe evulekile yeyunithi yezinhlamvu ayikwazi ukudlula umkhawulo kagesi wokufakwayo we-DC ezingeni lokushisa elincane ngokwedlulele.Isibonelo, uma i-voltage yesifunda evulekile yengxenye ingu-38V, i-coefficient yezinga lokushisa ngu-0.3%/℃, futhi i-voltage yesifunda evulekile ingu-43.7V ku-minus 25 ℃, khona-ke umkhawulo wezintambo ezingu-25 ungakhiwa.25 * 43.7=1092.5V.
Q: Ibanga le-voltage esebenzayo ye-MPPT
A: I-inverter yakhelwe ukuzivumelanisa ne-voltage eshintsha njalo yezingxenye.I-voltage yezingxenye iyahlukahluka kuye ngokushintsha kokukhanya nezinga lokushisa, futhi inani lezingxenye ezixhunywe ochungechungeni nalo lidinga ukuklanywa ngokuya ngesimo esithile sephrojekthi.Ngakho-ke, i-inverter isethe uhla lokusebenza lapho ingasebenza khona ngokujwayelekile.Uma ububanzi be-voltage buba banzi, kuba banzi ukusebenza kwe-inverter.
Q:Ibanga eligcwele le-voltage yokulayisha
A: Ngaphakathi kobubanzi be-voltage ye-inverter, ingakhipha amandla alinganiselwe.Ngaphezu kokuxhuma amamojula we-photovoltaic, kukhona nezinye izinhlelo zokusebenza ze-inverter.I-inverter inezinga eliphezulu lokufakwayo lamanje, elifana no-40kW, elingu-76A.Kuphela uma i-voltage yokufaka ingaphezu kuka-550V lapho okukhiphayo kungafinyelela ku-40kW.Lapho i-voltage yokufaka idlula i-800V, ukushisa okukhiqizwa ukulahlekelwa kukhuphuka kakhulu, okuholela ekutheni inverter idinge ukunciphisa ukuphuma kwayo.Ngakho-ke i-voltage yentambo kufanele yakhelwe ngangokunokwenzeka phakathi nobubanzi be-voltage yomthwalo ogcwele.
Q: I-voltage yokuqala
A :Ngaphambi kokuqala i-inverter, uma izingxenye zingasebenzi futhi zisesimweni esivulekile, i-voltage izoba phezulu kakhulu.Ngemuva kokuqala i-inverter, izingxenye zizobe zisesimweni sokusebenza, futhi i-voltage izokwehla.Ukuze uvimbele i-inverter ukuthi iqale ngokuphindaphindiwe, i-voltage yokuqala ye-inverter kufanele ibe phezulu kune-voltage encane yokusebenza.Ngemuva kokuthi i-inverter iqalisiwe, akusho ukuthi i-inverter izoba nokuphuma kwamandla ngokushesha.Ingxenye yokulawula ye-inverter, i-CPU, isikrini nezinye izingxenye zisebenza kuqala.Okokuqala, i-inverter iyahlola, bese ihlola izingxenye kanye negridi yamandla.Ngemuva kokuthi kungabikho izinkinga, i-inverter izoba nomphumela kuphela lapho amandla e-photovoltaic edlula amandla okulinda we-inverter.
I-voltage ephezulu yokufaka ye-DC ingaphezu kwamandla kagesi aphezulu okusebenza we-MPPT, futhi i-voltage yokuqala ingaphezu kwamandla kagesi asebenzayo we-MPPT.Lokhu kungenxa yokuthi amapharamitha amabili omthamo omkhulu kagesi wokufaka we-DC kanye ne-voltage yokuqala ahambisana nesimo sesekhethi evulekile yengxenye, futhi i-voltage yesekethe evulekile yengxenye ngokuvamile iba phezulu ngo-20% kune-voltage esebenzayo.
Q: Unganquma kanjani i-voltage ephumayo kanye ne-voltage yokuxhumeka kwegridi?
A : I-voltage ye-DC ayihlobene ne-voltage eseceleni ye-AC, futhi isiguquli esivamile se-photovoltaic sinokukhipha kwe-AC okungu-400VN/PE.Ukuba khona noma ukungabikho kwe-transformer yokuhlukanisa akuhlobene ne-voltage ephumayo.I-inverter exhunyiwe yegridi ilawula ukusebenza kwamanje, futhi i-voltage exhunyiwe yegridi incike ku-voltage yegridi.Ngaphambi kokuxhumeka kwegridi, i-inverter izobona i-voltage yegridi futhi ixhume kugridi kuphela uma ihlangabezana nemibandela.
Q: Buyini ubudlelwano phakathi kwe-voltage yokufaka ne-output?
A: Itholwe kanjani i-voltage ephumayo yegridi exhunywe i-photovoltaic inverter njengo-270V?
Ibanga eliphezulu lokulandela amandla le-MPPT ye-inverter enamandla amakhulu lingu-420-850V, okusho ukuthi amandla okukhiphayo afinyelela ku-100% lapho i-DC voltage ingu-420V.
I-voltage ephezulu (DC420V) iguqulelwa ku-voltage esebenzayo yamanje eshintshanayo, iphindaphindwe nge-coefficient yokuguqula ukuze kutholwe (AC270V), ehlobene nobubanzi bokulawulwa kwamandla kagesi kanye nomjikelezo womsebenzi wokuphuma kobubanzi be-pulse ohlangothini lokuphumayo.
Ibanga lokulawulwa kwamandla kagesi elingu-270 (-10% kuya ku-10%) lithi: amandla kagesi aphezulu kakhulu ohlangothini lwe-DC DC420V yi-AC297V;Ukuze uthole inani elisebenzayo lamandla we-AC297V AC kanye nogesi we-DC (i-voltage ephezulu ye-AC) engu-297 * 1.414=420V, ukubala okubuyela emuva kungathola i-AC270V.Inqubo ithi: Amandla e-DC420V DC alawulwa yi-PWM (i-pulse wide modulation) ngemva kokuvulwa nokuvala (IGBT, IPM, njll.), bese ayahlungwa ukuze kutholwe amandla e-AC.
Q: Ingabe ama-inverters e-photovoltaic adinga ukuhamba nge-voltage ephansi?
A:Iziguquli ezijwayelekile zohlobo lwesiteshi samandla se-photovoltaic zidinga ukuhamba nge-voltage ephansi ngomsebenzi.
Uma amaphutha egridi yamandla noma ukuphazamiseka kubangela ukwehla kwamandla kagesi ezindaweni zokuxhuma igridi yamapulazi omoya, izinjini zomoya zingasebenza ngokuqhubekayo phakathi kwebanga lokwehla kwamandla kagesi.Ezitshalweni zamandla we-photovoltaic, lapho izingozi zesistimu yamandla noma ukuphazamiseka kubangela ukwehla kwe-voltage yegridi, ngaphakathi kobubanzi obuthile kanye nesikhathi sokuphumula se-voltage drops, izitshalo zamandla e-photovoltaic zingaqinisekisa ukusebenza okuqhubekayo ngaphandle kokunqanyulwa kugridi.
Q: Ithini i-voltage yokufaka ohlangothini lwe-DC lwe-inverter exhunyiwe yegridi?
A: I-voltage yokufaka ohlangothini lwe-DC lwe-inverter ye-photovoltaic iyahlukahluka ngomthwalo.I-voltage ethile yokufaka ihlobene ne-silicon wafer.Ngenxa yokumelana okuphezulu kwangaphakathi kwamaphaneli e-silicon, lapho umthamo wamanje ukhuphuka, i-voltage yamaphaneli e-silicon izokwehla ngokushesha.Ngakho-ke, kuyadingeka ukuba nobuchwepheshe obuba ukulawulwa kwephoyinti lamandla esiphezulu.Gcina i-voltage ephumayo kanye neyamanje yephaneli ye-silicon ezingeni elifanele ukuze uqinisekise ukuphuma kwamandla aphezulu.
Ngokuvamile, kukhona ugesi osizayo ngaphakathi kwe-inverter ye-photovoltaic.Lokhu kusizwa kwamandla kagesi kungaqalwa lapho i-voltage ye-DC yokufaka ifinyelela cishe ku-200V.Ngemuva kokuqala, amandla anganikezwa kumjikelezo wokulawula wangaphakathi we-inverter, futhi umshini ungena kwimodi yokulinda.
Ngokuvamile, lapho i-voltage yokufaka ifinyelela ku-200V noma ngaphezulu, i-inverter ingaqala ukusebenza.Okokuqala, thuthukisa i-DC yokufaka ku-voltage ethile, bese uyiguqulela ku-voltage yegridi futhi uqinisekise ukuthi isigaba sihlala singashintshi, bese usihlanganisa kugridi.Iziguquli ngokuvamile zidinga ukuthi i-voltage yegridi ibe ngaphansi kuka-270Vac, ngaphandle kwalokho ayikwazi ukusebenza kahle.Uxhumano lwegridi ye-inverter ludinga ukuthi isici esikhiphayo se-inverter siyisici somthombo wamanje, futhi kufanele siqinisekise ukuthi isigaba sokukhipha siyahambisana nesigaba se-AC segridi yamandla.
Isikhathi sokuthumela: May-15-2024