Dab tsi yog qhov txawv ntawm bypass diode thiab anti rov qab diode?

1, Txoj Cai Ua Haujlwm: Sib txawv ntawm kev siv unidirectional conductivity
Bypass diode: ib tug active tiv thaiv ntawm qhov kub qhov chaw nyhuv
Lub bypass diode yog kev cob cog rua nyob rau hauv rov qab mus rau tib lub xaus ntawm lub photovoltaic module, siv lub unidirectional conductivity ntawm lub diode mus cuag thermal chaw tiv thaiv. Thaum cov zis hluav taws xob ntawm cov khoom siv txo qis vim qhov kev cuam tshuam hauv zos, kev ua haujlwm tsis zoo, lossis kev laus, lub diode coj mus rau pem hauv ntej, luv luv Circuit Court faulty tivthaiv thiab tso cai rau tam sim no hla qhov teeb meem hauv cheeb tsam. Piv txwv li, ib qho photovoltaic module yog tsim los ntawm 36 hnub ci hlwb txuas nrog hauv series. Yog tias ib qho ntawm lawv tsis tuaj yeem tsim hluav taws xob vim yog qhov ntxoov ntxoo, nws qhov sib npaug kuj yuav nce sai sai, thiab tag nrho cov hluav taws xob ntawm cov kab hluav taws xob yuav ua rau muaj zog ntawm lub xov tooj ntawm tes, uas ua rau muaj qhov kub siab tshaj - qhov kub thiab txias. Nyob rau ntawm lub sijhawm no, qhov sib npaug bypass diode conducts, hla lub roj teeb tsis raug ntawm tes los tiv thaiv nws los ntawm kev ua haujlwm thiab siv zog los ntawm lwm cov roj teeb li qub. Nyob rau tib lub sijhawm, nws tiv thaiv cov khoom ntim los ntawm deforming lossis lub roj teeb ntawm tes los ntawm kev tawg vim qhov ntsuas kub ntau dhau.

Anti rov qab diode: passive blocker ntawm tam sim no backflow
Kev tiv thaiv rov qab diodes yog txuas nrog cov hlua photovoltaic lossis DC cov thawv sib txuas, siv unidirectional conductivity los tiv thaiv kev thim rov qab tam sim no. Nws cov haujlwm tseem ceeb suav nrog:

Anti roj teeb rov qab: Nyob rau hauv ib qho kev ywj pheej photovoltaic system, thaum lub Cheebtsam tsis tsim hluav taws xob thaum hmo ntuj, lub anti thim rov qab diode tuaj yeem thaiv qhov thim rov qab ntawm cov roj teeb tam sim no rau hauv cov khoom, zam cov khoom cua sov thiab kev puas tsuaj;
Anti-string mutual txhaj tshuaj: Nyob rau hauv cov hlua sib txuas, yog tias ib ceg ntoo muaj qhov txo qis hauv qhov tso zis hluav taws xob vim qhov ntxoov ntxoo los yog qhov tsis zoo, cov tshuaj tiv thaiv rov qab tuaj yeem thaiv cov tam sim no los ntawm cov ceg hluav taws xob siab los ntawm ntws rov qab mus rau cov ceg tsis muaj hluav taws xob, tiv thaiv tag nrho cov zis hluav taws xob los ntawm kev poob. Piv txwv li, lub chaw nres tsheb photovoltaic muaj 10 txoj hlua. Yog tias ib txoj hlua tau ntsib qhov txo qis hauv qhov tso zis hluav taws xob vim yog daus npog thiab tsis muaj kev tiv thaiv rov qab diode, cov kab hluav taws xob ntawm lwm cov hlua yuav ua rau cov khoom siv hluav taws xob los ntawm cov hlua tsis zoo, uas ua rau poob ntawm kev ua haujlwm zoo; Tom qab kev txhim kho anti rov qab diodes, txoj hlua faulty raug rho tawm thiab qhov system tso zis voltage tseem ruaj khov.
2, Lub luag haujlwm tseem ceeb: Sib txawv ntawm kev ua haujlwm rau kev ua haujlwm
Bypass diode: dual lav ntawm efficiency thiab kev nyab xeeb
Tus nqi tseem ceeb ntawm bypass diodes yog nyob rau hauv kev tswj hwm lub zog tsim hluav taws xob efficiency thiab tiv thaiv kev nyab xeeb. Kev sim cov ntaub ntawv qhia tau hais tias cov khoom uas tsis muaj bypass diodes tuaj yeem txo cov zis hluav taws xob los ntawm 30% -50% thaum cuam tshuam ib nrab, thiab qhov kub ntawm qhov kub tuaj yeem ncav cuag 150 degree, ua rau muaj kev hem thawj rau lub neej ntawm cov khoom; Tom qab teeb tsa lub bypass diode, lub zog poob tuaj yeem tswj tau li ntawm 5%, thiab qhov kub ntawm qhov kub tuaj yeem txo qis dua 80 degree. Tsis tas li ntawd, bypass diodes tuaj yeem txo qis lub sijhawm ua haujlwm los ntawm kev ua haujlwm tsis ua haujlwm thiab txhim kho kev ua haujlwm zoo.

Anti rov qab diode: lub hauv paus ntawm qhov system stability
Lub luag haujlwm tseem ceeb ntawm kev tiv thaiv rov qab diodes yog los tswj qhov system voltage stability thiab lub zog siv efficiency. Hauv cov chaw tsim hluav taws xob photovoltaic loj, qhov sib txawv ntawm qhov sib txawv ntawm cov hlua yuav ua rau rov qab tam sim no, ua rau cov teeb meem hauv qab no:

Lub zog poob: Rov qab tam sim no siv lub zog tsim hluav taws xob zoo, txo cov kev ua haujlwm tag nrho;
Cov khoom puas tsuaj: Lub sij hawm ntev rov qab tam sim no tuaj yeem ua rau cov khoom siv cua sov, qhov sib txuas lub thawv burnout, thiab txawm tias hluav taws kub;
Kev saib xyuas tsis ua haujlwm: Tam sim no rov qab tuaj yeem cuam tshuam nrog kev saib xyuas qhov kev txiav txim siab ntawm cov khoom siv, ua rau muaj kev nyuaj ntawm kev ua haujlwm thiab kev saib xyuas.
Los ntawm kev txhim kho cov tshuaj tiv thaiv rov qab diodes, rov qab tam sim no tuaj yeem thaiv tau zoo, kom ntseeg tau tias qhov system voltage tseem nyob ruaj khov nyob rau hauv cov qauv tsim thiab txhim kho lub zog hloov hluav taws xob thiab cov khoom siv kev ntseeg siab.
3, Kev teeb tsa qhov chaw: sib txawv layout ntawm Circuit Court topology
Bypass diode: tiv thaiv qib tiv thaiv
Lub bypass diode feem ntau yog ua rau hauv lub thawv sib txuas ntawm lub photovoltaic module thiab txuas nrog rov qab ua ke nrog lub roj teeb pob. Nyob ntawm tus qauv tsim, txhua yam tuaj yeem teeb tsa nrog 1-3 bypass diodes. Piv txwv li, ib feem ntawm 60 roj teeb hlwb yuav siv 2 bypass diodes, txhua diode tiv thaiv 30 roj teeb hlwb; Yog tias siv 3 diodes, txhua qhov kev tiv thaiv 20 lub roj teeb roj teeb tuaj yeem cais thaj chaw ua txhaum ntau dua thiab txo cov hluav taws xob poob ntawm cov roj teeb li qub.

Anti rov qab diode: kev tiv thaiv qib
Anti thim rov qab diodes feem ntau yog ntsia ntawm cov tswv yim ntawm DC cov thawv sib txuas lossis cov inverters, txuas nrog hauv cov khoom siv hluav taws xob ntawm cov hlua. Nyob rau hauv loj fais fab nroj tsuag, txhua txoj hlua tso zis davhlau ya nyob twg tej zaum yuav nruab nrog ib tug anti rov qab diode; Nyob rau hauv lub thawv sib txuas, ntau txoj hlua tuaj yeem muab ib qho kev tiv thaiv rov qab diode module tom qab sib txuas los txo cov nqi thiab chaw ua haujlwm. Piv txwv li, 1MW photovoltaic fais fab chaw nres tsheb muaj 20 50kW cov hlua, thiab 4 anti rov qab diode modules tuaj yeem teeb tsa hauv lub thawv sib txuas, txhua qhov module tiv thaiv 5 txoj hlua.

4, Cov txheej txheem xaiv: Cov kev xav tau sib txawv rau kev sib piv
Bypass diode: Voltage kuj, tam sim no thiab thermal kev ua tau zoo yog qhov tseem ceeb
Kev xaiv ntawm bypass diodes yuav tsum ua tau raws li cov cai hauv qab no:

Rov qab tiv thaiv hluav taws xob: Nws yuav tsum muaj ntau dua 1.5 npaug ntawm qhov qhib hluav taws xob hluav taws xob ntawm cov khoom siv. Piv txwv li, yog tias qhov hluav taws xob qhib hluav taws xob ntawm cov khoom siv yog 45V, qhov rov qab tiv thaiv hluav taws xob ntawm lub bypass diode yuav tsum muaj ntau dua lossis sib npaug rau 67.5V;
Forward tam sim no: Nws yuav tsum ntau dua 1.2 npaug ntawm luv luv -circuit tam sim no ntawm cov khoom. Piv txwv li, yog tias luv luv -circuit tam sim no ntawm ib feem yog 9A, lub hauv ntej tam sim no ntawm lub bypass diode yuav tsum siab tshaj los yog sib npaug rau 10.8A;
Thermal resistance and junction temperature: Nws yog ib qho tsim nyog yuav tsum xav txog qhov kub thiab txias ib puag ncig hauv cov khoom (feem ntau yog 20-30℃siab dua qhov kub ntawm qhov nruab nrab), thiab xaiv diodes uas tsis tshua muaj thermal tsis kam thiab siab hlws ris kub. Piv txwv li, yog tias qhov kub thiab txias ntawm ib feem tuaj yeem ncav cuag 85 degree, lub diode hlws ris kub yuav tsum siab dua lossis sib npaug li 125 degree;
Kev poob siab: Lub siab poob qis dua, qhov me dua lub zog poob. Schottky diodes feem ntau siv nyob rau hauv qis- cov khoom siv hluav taws xob vim qhov hluav taws xob poob (0.2-}0.3V), thaum silicon rectifier diodes (voltage poob 0.7-1V) yog tsim rau cov khoom siv hluav taws xob siab.
Anti rov qab diode: Voltage kuj, tam sim no thiab kub dissipation yog cov tub ntxhais
Kev xaiv ntawm anti rov qab diodes yuav tsum ua tau raws li cov cai hauv qab no:

Rov qab tiv thaiv qhov hluav taws xob: Nws yuav tsum muaj ntau dua ob npaug ntawm qhov siab tshaj plaws kev khiav hauj lwm voltage ntawm qhov system. Piv txwv li, yog tias qhov kev ua haujlwm siab tshaj plaws ntawm qhov system yog 1000V, qhov rov qab tiv thaiv hluav taws xob ntawm cov hluav taws xob thim rov qab yuav tsum muaj ntau dua lossis sib npaug li 2000V;
Forward tam sim no: Nws yuav tsum muaj ntau dua 1.5 npaug ntawm qhov siab tshaj plaws tso zis tam sim no ntawm txoj hlua. Piv txwv li, yog hais tias qhov siab tshaj plaws tso zis tam sim no ntawm ib tug tej hlua yog 12A, lub pem hauv ntej tam sim no ntawm anti rov qab diode yuav tsum tau ntau tshaj los yog sib npaug zos rau 18A;
Thaum tshav kub kub dissipation tsim: Nws yog ib qho tsim nyog yuav tsum xav txog qhov kub thiab txias ib puag ncig hauv lub thawv sib xyaw (feem ntau mus txog 60-80 degree), thiab xaiv cov qauv uas tsis muaj thermal tsis kam thiab cov dab dej kub. Piv txwv li, qhov thermal kuj ntawm ib qho kev tiv thaiv rov qab diode module yog 0.5℃/ W, uas tuaj yeem txo qhov kub thiab txias;
Voltage poob thiab kev siv hluav taws xob: Qhov qis dua qhov hluav taws xob poob, qhov system efficiency ntau dua. Qhov hluav taws xob poob ntawm photovoltaic nplooj siab tiv thaiv rov qab diode modules tuaj yeem qis li 1.0-1.5V, txo lub zog siv los ntawm 20% -30% piv rau cov qauv zoo tib yam (1.5-2V).
5, Cov ntaub ntawv siv tswv yim: kev pom zoo ntawm kev sib koom tes
Case 1: Optimization ntawm bypass diodes hauv 50MW photovoltaic fais fab chaw nres tsheb
Lub chaw nres tsheb fais fab yog tsim los nrog ib qho bypass diode rau ib feem, tab sis tom qab ntawd nws tau pom tias lub zog poob tseem mus txog 15% thaum qee qhov cuam tshuam. Los ntawm kev siv lub tswv yim ntawm kev siv 3 bypass diodes ib feem, lub zog poob qis qis dua 5%, thiab lub zog tsim hluav taws xob txhua xyoo yog nce li ntawm 2%. Nyob rau tib lub sijhawm, qhov kub ntawm qhov kub thiab txias tau txo los ntawm 120℃mus rau 70 degree, thiab qhov cuam tshuam tsis ua haujlwm tau txo qis los ntawm 40%.

Case 2: Anti rov qab diode retrofit ntawm 10MW photovoltaic fais fab chaw nres tsheb
Lub hwj chim chaw nres tsheb tsis yog Ameslikas nruab nrog anti rov qab diodes, thiab tam sim no backflow ntawm lub series ua rau ib tug 8% poob ntawm system efficiency, thiab 3-5 junction box burnout xwm txheej tshwm sim txhua xyoo. Los ntawm kev txhim kho photovoltaic tshwj xeeb kev tiv thaiv rov qab diode modules hauv lub thawv sib txuas, kev ua haujlwm ntawm lub cev tau zoo dua los ntawm 5%, lub thawv sib txuas tsis ua haujlwm raug txo qis rau xoom, thiab cov nqi khiav lag luam thiab kev saib xyuas raug txo los ntawm 30%.