Yog vim li cas txiav hlwb nyob rau hauv ib nrab
Feem ntau ntawm cov txiaj ntsig ntawm ib nrab ntawm cov xov tooj ntawm tes yog raug txo los ntawm ib nrab ntawm cov vaj huam sib luag ntawm lub vaj huam sib luag. Halving qhov tam sim no txo lowly cov losses, uas yog vim li cas cov kev kawm yog kho kom zoo. Qhov no tau ua rau ntau cov kev pab xws li cov zis ntau dua, zoo dua ib lub m² thiab zoo dua hauv kev ua kom sov. Cov kev pab cuam Shading, kev ua kom zoo dua qub thiab qee qhov kev ua tau zoo tshaj kuj tau paub nrog cov tsim nyog kho vaj tse configuration.
Txo qhov raug mob
Hauv ib lub hnub ci, lub hwj huam poob tau tshwm sim raws li cov electrons taug kev los ntawm kev sib txuas ntawm cov xov tooj ntawm tes thiab cov tsheb loj. Txij li cov hwj chim sib npaug kuj sib npaug ntawm qhov sib tw squared tam sim no (P poob = R x I²), txo qis dua tam sim no yuav txo qhov poob. Splitting lub xov tooj ntawm ob rau hauv tam sim no (tsis qhov voltage) ntawm lub xov tooj ntawm tes, yog li thaum koj thov qhov kev hloov no mus rau qhov kev sib npaug qhov raug txo los ntawm 75%. Raws li qhov tam sim no yog qhov siab tshaj plaws hauv lub sijhawm ntau ntau, qhov no yog qhov txiaj ntsim tshaj plaws . Txo kom txo tau cov nyiaj poob qis yog tsis muaj dab tsi tshiab, peb tau ua nws rau ntau dhau ib xyoo hauv kev siv hluav taws xob kis. Txawm li cas los muaj ob zaug cov nyiaj ntawm ib nrab tam sim no hlwb doubles peb voltage, uas yuav muaj pliaj txim rau tsim tsim. Qhov no yog daws hauv kev kho vaj huam sib luag kho qauv.
Txheem 60 tes ntawm 120 ntawm ib nrab ntawm cov vaj huam sib luag ntawm tes
Tus tshiab, zoo dua configuration
Yuav kom nkag siab tias qhov no ua haujlwm li cas, koj yuav tsum paub cov hauv qab no:
Ntxiv cov qe ntshav hauv ib txoj hlua (koob) ntaus nqi hluav taws xob, tsis yog tam sim no
Ntxiv ob txoj hlua ntawm cov hlwb (nyob mus tib seem) accumulates tam sim no, tsis voltage
Thiaj li yog hais tias qhov 120 ib nrab ntawm cov qoob hlwb tau wired ntawm ib txoj hlua, peb yuav muaj ob zaug qhov voltage thiab ib nrab ntawm tam sim no ntawm ib qho kev sib txuas ntawm 60 ntawm tes. Txhim kho qhov no, cov tuam txhab tau muab kho kom zoo dua qub rau ob txoj hlua ntawm 60 ib nrab ntawm cov xov tooj ntawm tes uas txuas nrog rau qhov sib luag. Zuag qhia tag nrho yog qhov yooj yim heev, raws li qhov teeb meem thiab qhov tam sim no tawm yog zoo ib yam ntawm 60 tus qauv ntawm tes, tab sis lub qhov tam sim no yog qhov teeb meem. Qhov no tshwm sim nyob rau hauv ib qho 1.5-3% nce nyob rau hauv efficiency, uas yog ntau profound tshaj nws suab. Nws kuj muaj qee cov tshuaj txaus nyiam.
Shading tuav kev txhim kho
Raws li tau hais, qhov kev hloov hauv qhov tsim tawm rau lub vaj huam sib luag yuav ua tau zoo dua nyob rau hauv qee qhov kev sib txawv scenarios. Ua ntej khawb qhov no, thov nco ntsoov ob peb yam:
Shading tseem yuav muaj kev cuam tshuam rau koj lub cev, txawm tias nws yog qhov scenarios tau txais los ntawm cov pawg no.
Lub vaj huam sib luag yuav coj txawv ntawm nws tus kheej tshaj li nws yuav nyob hauv ib txoj hlua los nrog ib qho MLPE ntaus ntawv (Module Level Power Electronics, zoo li micro-inverters los yog optimisers).
Ib yam ntawm cov khoom lag luam thawb yog rab peev xwm rau theem nrab sab saum toj ntawm lub vaj huam sib luag kom ua tsis zoo yog tias hauv qab ib nrab yog nyob rau hauv qhov ntxoov ntxoo, los yog lwm yam. Yuav kom nkag siab qhov no, peb yuav tsum tau ceev refresh on shading.
Vim li cas thiaj yuav shading tau zoo dua nyob rau ntawm ib nrab ntawm lub vaj huam sib luag ntawm tes
Thaum koj muaj ob txoj hlua txuas nrog rau thaum uas tig mus (zoo li saum toj thiab hauv qab ib nrab ntawm cov panels no), koj tuaj yeem cais tawm xov tooj qis tam sim ntawd rau sab ntawd. Yog li ib nrab yuav ua tau ntawm 10% lub peev xwm thiab lwm yam uas ua rau tag nrho. Qhov no yog ib qho zoo heev, tab sis nws los nrog ib tug drawback.
Nco ntsoov kuv cov lus, "Lub vaj huam sib luag yuav coj txawv ntawm nws tus kheej dua li nws yuav nyob hauv ib txoj hlua los yog ib qho MLPE ntaus ntawv"? Qhov no yog vim li cas nws tseem ceeb.
Cia peb hais tias koj muaj ib txoj hlua ntawm 10 lub voj voog (feem ntau tshwm sim), ntawm ib txoj hlua inverter, txhua yam hauv lub hnub ci zoo - tsuas yog ib lub vaj huam sib luag uas muaj qhov ntxoov ntxoo rau hauv qab ib nrab. Hauv qhov no, qhov vaj huam sib luag yuav tsim tawm ntawm 50%, tab sis, ces yuav tag nrho lwm cov panels. Qhov no tsis zoo tagnrho. Tus inverter MPPT yuav tsis qhia qhov no tshwm sim. Es tsis txhob, qhov tam sim no yuav nyob siab thiab cov duab ntxig bypass rau ntawm lub vaj huam sib luag yuav qhib thiab dhau tag nrho cov vaj huam sib luag.
Yog hais tias koj muaj ib lub optimiser los yog micro-inverter hauv qhov scenario saum toj no, nws yog ib zaj dab neeg sib txawv (zoo dua). Lub vaj huam sib luag ntawd mam li ua rau ntawm 50% thaum lwm tus mus ntxiv.
Ntawm no yog ib qho kev qhia:
Ob Scenarios
Ob leeg muaj 10 ib nrab ntawm cov xaim hluav taws xob ntawm lub voj voog nyob rau hauv ib txoj hlua, siv ib txoj hlua inverter, sib txawv ntxoov ntxoo.
Scenario1 , pom tias 90% shading hauv qab ib nrab ntawm ib lub vaj huam sib luag (raws li qhia)
Bypass diodes ntawm vaj huam sib luag 1 yuav qhib
Dua li ntawm cov qe hlwb tsawg, qhov system no tseem zoo dua xa tawm ib qho kev vaj huam sib luag nkaus thaum muaj qis dua. Saib hauv qab cov lus qhia ntxaws ntxaws thiab yooj yim ntawm vim li cas. Nco Ntsoov:
1 lub hwj chim (P) = Tam sim no (I) xVoltage (V)
1 Cia peb hais tias cov khoom ua haujlwm yog ze li ntawm approx. 30 V thiab 9 Amps
3 Voltage nce thaum koj khib panels hauv ib txoj hlua, tam sim no tsis hlua ua haujlwm ntawm qhov qis tshaj.
Qhov Xaiv 1 - Diodes nquag, poob vaj huam sib luag 1 nkaus:
P = 9 amps x 270 Volts (9 panels @ 30Volts), P = Approx. 2430 Watts
Kev Xaiv 2-Dias tawm tsis vam meej, txo tsawg ntawm tag nrho cov panels:
P = 4.95 amps x 300 Volts (9 panels @ 30Volts), P = Approx. 1485 Watts
Scenario 2 , pom 90% shading rau hauv qab ntawm tag nrho cov panels
Txhua tus bypass diodes yuav nyob tsis muaj zog
Qhov no yog qhov twg ib nrab ntawm cov hlwb tawg zoo heev. Kev ntsuas ntawm lub cev yuav tsis nquag plias thiab ntau lawm yuav tsum xaiv 2 saum toj no. Nrog ib lub vaj huam sib luag, yuav luag tag nrho cov khoom yuav raug poob lawm.
Hauv ob lub hom phiaj, ib qho twg qhov twg ib nrab ntawm cov qe hlwb yuav tsis pab thiab lwm qhov chaw uas lawv yuav pab tau immensely.
