Yuav ua li cas txiav txim siab seb puas diodes nyob rau hauv lub hnub ci zog yog puas lawm?

, Tus tseem ceeb lub luag haujlwm ntawm dodes nyob rau hauv lub nruab hnub ci zog
Hom thiab cov haujlwm ntawm diodes
Bypass Diode: parallel txuas rau ntawm ob xaus ntawm txoj hlua roj teeb, muab ib txoj hauv kev rau thermal no (tsis txhob muaj kev puas tsuaj thermal
Anti Rov Qab Them Diode: Txuas nrog rau ntawm photovoltaic array thiab cov maub los ua haujlwm, nws txwv tsis pub rov qab los ntawm cov roj teeb pob, nws tiv thaiv hnub los nag, tiv thaiv lub roj teeb lub neej.
Thaiv Diode: Siv nyob rau hauv ntau series cov tshuab ntsuas kom tiv thaiv tam sim no los ntawm kev ntws rov qab mus rau hauv cov khoom lag luam tsawg, ua haujlwm ywj siab ntawm txhua koob.
Cov kev tshwm sim ntawm Diode kev puas tsuaj
Tshav kub cov txiaj ntsig zoo ua kom muaj zog: Tom qab tsis ua tiav ntawm cov kab mob hlwb, thiab qhov kub tau nce ntau dua 200 degree, ua rau kev laus ntawm cov khoom ntim ntim thiab txawm tias tseem muaj kev nkag siab.
Lub Zog Hluav Taws Xob Generation txo qis: Rov qab los tiv thaiv Diode tuaj yeem ua rau lub roj teeb pob thaum hmo ntuj, ua rau muaj kev ploj txhua hnub mus txog 5% -10% ntawm hluav taws xob.
Kev pheej hmoo ntawm cov khoom siv kev puas tsuaj: thaiv Diode tsoo tej zaum yuav ua rau cov hlua sib tw, hlawv cov txuas lossis cable.
2, kev pom kev pom kev thiab kev txiav txim siab ua ntej ntawm Diode kev puas tsuaj
1. Pom qhov tsis sib luag
Yaig Cov Cim: Cov saum npoo ntawm ib qho diode yog du, tab sis tom qab kev puas tsuaj dub, tawg, lossis tus pin melting yuav tshwm (raws li qhia hauv daim duab 1). Piv txwv li, ib lub photovoltaic muaj kev paub cov roj carbon ntau ntawm cov txuas vim tias qhov kev sib tsoo ntawm cov bypass diode.
Kev ntim deformation: Kub Kub Ua rau nthuav tawm Epoxy Retin lossis ntim yas, feem ntau pom nyob rau hauv ntev- lub sij hawm overloadarios.
Cov xim hloov: silicon cov khoom siv dodes yuav hloov ntawm dub rau grey rau grey dawb ntawm kev sib piv cov cheebtsam ntawm tib pawg.
2 qhov system ua haujlwm txawv txav
Txoj hlua khi tsis ruaj khov: Siv ntau ntau ua rau ntsuas qhov qhib Circuit Court voltage ntawm txhua txoj hlua. Yog tias qhov hluav taws xob ntawm ib txoj hlua yog qis dua li ntawm lwm cov hlua (xws li ntau dua 10% qis dua li qhov tsis muaj nuj nqis ntawm kev hla dhau kev ua haujlwm.
Nighttime current backflow: In the absence of light, use a clamp ammeter to detect the output terminal of the photovoltaic array. If there is a reverse current (>0.1a), nws qhia tau tias cov anti rov qab them cov diode yog luv luv circuited.
Cov cua sov txawv: Cov cua sov infrared thermal ntsuas cov cuab yeej ntsuas qhov chaw kub ntawm Diode. Qhov ntsuas kub ib txwm yuav tsum nyob hauv qab 85 degree. Yog tias lub zos kub ntau dua 120 degree, lub tshuab yuav tsum nres tam sim ntawd kev kuaj xyuas.
3, Kev Tshawb Nrhiav Kev Txawj Ntse rau Diode kev puas tsuaj
1 Kev Tshawb Nrhiav Offline (Txheej Txheem Ua Haujlwm Tsis Ua Haujlwm)
Kev ntsuas siab siab siab poob siab:
Teeb lub multimeter rau diode hom (lossis 2V dc hom).
Txuas tus ncej zoo rau lub anode ntawm diode thiab tus ncej tsis zoo rau cathode, thiab sau cov voltage voltage poob (vf).
Normal silicon diode VF should be 0.5-0.7V, and Schottky diode VF should be 0.2-0.4V. If VF>1V lossis qhia OL (qhib Circuit Court), nws qhia tau tias Diode yog qhib Circuit Court; Yog vf<0.1V, there may be a short circuit caused by breakdown.
Thim rov qab sim sim tam sim no:
Siv qhov siab - precision multimeter (xws li fluke 87v) hauv lub μ ntau.
Rov qab txuas lub Diode (nrog tus zoo ncej txuas nrog rau cathode thiab tus ncej tsis zoo txuas nrog anode) thiab thov rov qab voltage (xws li 20V).
Qhov kev thim rov qab so ntswg tam sim no ntawm cov diode yuav tsum tsawg dua 1 μ μ A. Yog tias nws muaj ntau dua 10 μ μ A, nws qhia tau tias tsawg hauv rwb thaiv tsev rwb thaiv tsev ua haujlwm.
2 Kev Tshawb Xyuas Hauv online (system energized)
Dynamic soj ntsuam tam sim no:
Siv tus oscilloscope mus ntes cov voltage waveForm thoob plaws ntawm diode.
Tus qub bypass Diode yog nyob rau hauv txoj hlua Cuthopp rov qab thaum txoj hlua yog qhov qub, thiab lub voltage yog ze rau qhov chaw qhib hluav taws xob ntawm txoj hlua; Thaum txoj hlua tau obstructed, tus dide ua rau hauv ntej kev taw qhia thiab cov hluav taws xob rau pem hauv ntej mus rau ib ncig VF.
Yog hais tias cov nthwv dej qhia ua ntej kev conduction txuas ntxiv mus ntxiv lossis thim rov qab tam sim no hloov pauv, nws qhia tau Diode parameter drift.
Qhov kev ua haujlwm infrared thermal ua ntej:
Tshawb xyuas cov Diode thaj chaw nrog infrared thermal imager thaum muaj hnub yug txaus.
Lub diode ib txwm yuav tsum nyob ze rau cov tib neeg ib puag ncig. Yog tias qhov kub nyob hauv zos siab dua 20 degree, nws yuav ua rau muaj kev kub ntxhov dhau los ua kev poob ntau.
4, hauv paus ua rau pom thiab tiv thaiv kev ntsuas ntawm Diode kev puas tsuaj
1 lub teeb meem muaj kev puas tsuaj
OverVolTage Surge: Xob laim ntaus lossis cov kev hloov pauv rov qab ua rau muaj kev sib hloov ntawm cov nqi (xws li thaum lub VRRM ntawm 1000V, 20% npoo yuav tsum muaj rau kev siv tiag tiag).
Overcurrent thiab overheating txoj hlua tshaj tawm ua rau qee qhov diodoes kom nqa tau ntev ntev (xws li thaum tus qauv tsim tam sim no yog 10a, tab sis nws yeej ntws 15a).
Kev tsim kho tsis xws luag: Virtual soldering lossis nti solderual txheej hauv lub Diode, uas yog qhov nyuaj los xyuas hauv theem pib thiab maj mam poob tom qab ua haujlwm.
Kev tiv thaiv ib puag ncig corrosion: hauv cheeb tsam noo, oxidation ntawm Diode Pins ua rau muaj kev sib chwv tau ntau thiab nrawm vim kub nyob hauv nruab nrab.
2 Kev Tiv Thaiv thiab Txij Nkawm Cov tswv yim
Xaiv kev ua kom tau zoo:
Qhov rated tam sim no ntawm Bypass Diode yuav tsum muaj ntau dua los yog sib npaug ntawm txoj hlua tam sim no ntawm txoj hlua, thiab cov kev rov qab los yog ntau dua lossis sib npaug ntawm cov kab hluavtaws ntawm cov kab ke.
Cov anti rov qab them cov nqi them yuav tsum tau xaiv raws li qhov vf tsawg (xws li SB5100, VF =0.45 v) kom txo qis kev siv sijhawm.
Cov ntsiab lus tshwj xeeb:
Qhov ntev ntawm cov hlau txuas nruab nrab ntawm Diode thiab lub roj teeb txoj hlua yuav tsum tsawg dua 30cm kom txo cov parasitic inductance.
The installation surface of the heat sink should be flat and coated with thermal conductive silicone grease (thermal conductivity>2w / min k) kom muaj thermal tsis kam<1 ℃/W.
Kev soj ntsuam ib txwm:
Luam theej duab tus yuam sij dodes nrog ib lub thermal thermal imager txhua lub quarter thiab tsim cov ntaub ntawv ntsuas kub.
Conduct offline testing once a year to replace components with VF deviation>10% lossis to tam sim no tshaj tus qauv.
5, Kev Kawm Kev Kawm: Kev daws teeb meem ntawm Diode yuam kev hauv 10kW photovoltaic system
1. Txhaum Eromenon
Tom qab 3 xyoos kev ua haujlwm, lub zog hluav taws xob txo qis los ntawm 15% piv rau tib lub sijhawm voltage poob los ntawm 51.2V rau 49.8V.

2. Kev tshawb nrhiav txheej txheem
Cov tsos tshuaj xyuas: nws tau pom tias cov ntim ntawm cov bypass Diode hauv txoj hlua 2 tau me ntsis bulging, thiab muaj cov cim oxidation ntawm cov pins.
Kev sim offline:
Rau pem hauv ntej Volvage poob tes kuaj qhia VF =1.2 v (tus nqi 0.6v), qhia txog qhov nce ntawm kev tiv taus.
Qhov rov qab rov qab sim tam sim no xeem yog 5 μ a (tus nqi ib txwm muaj<1 μ A), and the insulation performance decreases.
Cov Txheej Txheem Txheej Txheem Txheej Txheem:
Tom qab hloov lub faulty diode, qhov voltage ntawm txoj hlua 2 rov qab mus rau tib theem li lwm cov hlua (36.5v).
Thaum tsaus ntuj, qhov hluav taws xob ntawm cov roj teeb pob tseem ruaj khov ntawm 51.0v, thiab lub zog hluav taws xob nce mus rau 98% ntawm tus qauv tsim.
Hauv paus ua rau tsom xam
Kev xaiv tsis raug cai: tus thawj ntsuas tam sim no ntawm daim diode yog 8a, tab sis qhov tseeb luv luv {1} ai- sij hawm overload.
Cov cua sov tsis txaus: Tsis muaj lub tshav kub lub dab dej tau nruab nrog, diode junction kub tshaj 125℃rau lub sijhawm ntev.