Dab tsi yog Qhov Kev Tiv Thaiv PID ntawm Hnub Ci Vaj Huam Sib Luag?
1.PID Effect
Lub npe tag nrho ntawm PID yog: Potential Induced Degradation, uas txhais tau hais tias muaj peev xwm induced degradation.
Cov nyhuv PID tau pom thawj zaug thiab pom zoo los ntawm Asmeskas lub tuam txhab SunPower hauv xyoo 2005. Nws hais txog kev ua haujlwm ntev ntawm cov khoom siv hluav taws xob siab, qhov muaj qhov ntws tawm tam sim no ntawm lub hau npog iav, cov khoom ntim thiab cov thav ntawv, thiab cov khoom ntim ntawm ib Tus nqi loj ntawm cov nqi ntawm lub xov tooj ntawm tes, uas ua rau cov nyhuv passivation tsis zoo rau ntawm lub xov tooj ntawm tes, ua rau txo qis ntawm cov khoom sau, luv luv tam sim no thiab qhib-circuit voltage, ua rau cov khoom ua haujlwm qis dua qhov tsim. txheem. Lub degree ntawm attenuation tuaj yeem ncav cuag 50%, tab sis qhov attenuation no rov qab tau.
2. Mechanism ntawm PID nyhuv
① High voltage effect
Qhov loj-scale daim ntawv thov ntawm photovoltaic systems tau ua rau siab dua thiab siab dua qhov system voltages. Cov roj teeb modules feem ntau xav tau ntau lub modules txuas nrog hauv cov koob kom ncav cuag MPPT ua haujlwm voltage ntawm inverter, uas ua rau muaj qhov qhib hluav taws xob ntau thiab ua haujlwm voltage.
Noj 72-cell roj teeb module ntawm 450W nyob rau hauv STC ib puag ncig ua piv txwv, qhib Circuit Court voltage ntawm ib tug 20- hlua roj teeb module yog siab li 1000V thiab qhov ua hauj lwm voltage siab li 800V. Txij li cov chaw nres tsheb fais fab photovoltaic yuav tsum tau nruab nrog kev tiv thaiv xob laim thiab cov phiaj xwm hauv av, aluminium alloy thav duab ntawm cov khoom siv dav dav yuav tsum tau ua hauv av, thiab DC high voltage ntawm ze li ntawm 1000V yuav raug tsim los ntawm cov roj teeb lub hlwb thiab cov thav duab aluminium, ua rau muaj kev cuam tshuam loj heev. voltage bias ntawm lub Circuit Court thiab cov hlau grounding ncej.
② Ion tsiv teb tsaws
Nyob rau hauv lub high voltage ntawm lub ntim khoom ntawm lub roj teeb module thiab cov ntaub ntawv nyob rau hauv nws sab sauv thiab sab saum toj, thiab nruab nrab ntawm lub roj teeb ntawm tes thiab nws grounded hlau ncej, ion tsiv teb tsaws tshwm sim, uas ua rau cov khoom siv degradation.
Thaum lub hnub ci cell yog polarized nrog lub siab tsis zoo voltage, muaj qhov cuam tshuam qhov sib txawv ntawm lub roj teeb nws tus kheej thiab lub module ncej. Qhov no yog qhov tsis muaj peev xwm vim tias feem ntau ntawm lub sijhawm nws yog hauv av, yog li vim qhov kev ncua deb ntawm lub hnub ci ntawm lub xov tooj ntawm tes thiab lub thav duab thiab vim muaj peev xwm ua tau impurities hauv cov khoom sib khi, tam sim no tuaj yeem tsim tawm ntawm lub xov tooj ntawm tes thiab cov ncej, tsim tam sim no to rau tag nrho photovoltaic module.
3. Ua rau PID nyhuv
① Dej vapor nkag mus rau lub hnub ci vaj huam sib luag
Dej vapor muaj qhov cuam tshuam loj rau PID cov nyhuv hauv cov hnub ci vaj huam sib luag. Raws li qhov kub thiab txias, cov dej vapor hauv huab cua pib condense thiab sib sau rau ntawm lub hnub ci vaj huam sib luag. Thaum lub sij hawm, qhov condensation no tuaj yeem ua rau cov dej noo nyob hauv lub hnub ci vaj huam sib luag, uas tuaj yeem ua rau muaj teeb meem.
Cov dej vapor uas nkag mus rau lub hnub ci vaj huam sib luag tuaj yeem tsim hluav taws xob kaw nrog lub hnub ci hlwb thiab lwm yam khoom ntawm lub hnub ci vaj huam sib luag. Qhov no ua rau muaj hluav taws xob txaus uas tuaj yeem ua rau lub hnub ci vaj huam sib luag ua haujlwm tsis zoo tshaj qhov yuav tsum tau ua.
② EVA Hydrolysis
Qhov thib ob ua rau PID nyhuv yog hydrolysis ntawm Ethylene Vinyl Acetate (EVA) encapsulant khoom. EVA yog cov khoom siv dav siv hauv kev tsim cov hnub ci vaj huam sib luag. Thaum raug cov av noo thiab kub, EVA yog nquag tsim acetic acid (vinegar).
Acetic acid uas ua los ntawm hydrolysis ntawm EVA cuam tshuam nrog cov khoom siv hlau ntawm lub hnub ci vaj huam sib luag thiab tsim ib txoj hauv kev rau kev khiav ntawm tam sim no. Qhov ntws ntawm qhov tam sim no ua rau poob ntawm lub zog tso zis.
③ Cov tshuaj tiv thaiv ntawm cov iav nto
Qhov thib peb ua rau PID nyhuv yog cov tshuaj tiv thaiv ntawm acetic acid thiab iav nto ntawm lub hnub ci vaj huam sib luag. Kev sib xyaw ntawm acetic acid thiab iav nto ua rau sodium acetate. Sodium acetate yog cov tshuaj electrolyte uas tuaj yeem ua hluav taws xob. Qhov kev khiav ntawm hluav taws xob no ua rau poob ntawm lub zog hluav taws xob.
④ Sodium ions txav hauv qhov hluav taws xob
Qhov thib plaub yog vim li cas rau cov nyhuv PID yog qhov txav ntawm sodium ions hauv qhov hluav taws xob. Sodium yog cov ion mobile tshaj plaws nyob rau hauv iav, thiab thaum nws nkag mus rau hauv lub hnub ci vaj huam sib luag, nws reacts nrog lub hnub ci hlwb, tsim ib tug kaw Circuit Court.
Thaum lub hnub ci vaj huam sib luag raug cuam tshuam rau qhov sib txawv ntawm qhov sib txawv, sodium ions tuaj yeem txav mus rau hauv lub hnub ci vaj huam sib luag, tsim cov cheeb tsam ntawm cov hluav taws xob siab. Qhov kev khiav ntawm hluav taws xob no ua rau poob ntawm lub zog hluav taws xob.
4. PID Test Method
IEC 62804 Photovoltaic (PV) modules: Cov txheej txheem kuaj xyuas kom pom qhov muaj peev xwm cuam tshuam kev puas tsuaj. Kev kuaj mob rau kev kuaj pom muaj peev xwm ua rau muaj kev puas tsuaj raws li IEC 62084 yog:
60 degree huab cua kub
85% txheeb ze humidity
Voltage bias ntawm +1000V, -1000V, +1500V los yog -1500V (nyob ntawm seb tus yam ntxwv ntawm PV module)
Tag nrho lub sijhawm xeem yog 96 teev
Cov txheej txheem dhau los yog feem ntau cuam tshuam nrog lub zog degradation ntsuas thaum kawg ntawm kev xeem. Yog tias nws tsis tshaj 5%, qhov kev xeem dhau lawm. Yog li, qhov kev sim no tsis paub tseeb tias PID yuav tsis tshwm sim lossis tias qhov module tsis muaj PID. PV modules nrog qis zog degradation nyob rau hauv IEC 62804 ntawv pov thawj tej zaum yuav muaj feem ntau resistant rau PID teebmeem. Tam sim no qee cov tuam txhab lag luam txuas ntxiv lub sijhawm (txog 600 teev) ntawv pov thawj, thiab hom kev ntsuas no txhim khu kev qha rau cov khoom uas tiv taus PID cov teebmeem.
5. Kev daws teeb meem rau PID nyhuv
PID nyhuv ntawm P-type crystalline silicon modules (paj ASF hlwb, PERC hlwb)
Hauv kev ua haujlwm tiag tiag ntawm cov chaw nres tsheb fais fab, PID attenuation yog muaj nyob rau hauv cov pa crystalline silicon modules nrog thav ntawv (soda-lime iav, EVA zaj duab xis). Qhov siab dua qhov DC system voltage, qhov av noo ntau dua, thiab qhov kub thiab txias, qhov PID attenuation loj dua. Cov nyhuv PID ntawm P-hom crystalline silicon modules tuaj yeem txo los ntawm cov hauv qab no:
A. Siv quartz iav es tsis txhob haus dej qab zib iav kom tshem tawm Na+ thiab Ca+2 ions;
B. Siv ob-iav frameless modules kom tsis txhob thav duab grounding;
C. Siv cov khoom sib xyaw (nylon, polyurethane cov ntaub ntawv, thiab lwm yam);
Txhim kho EVA lossis nce qhov ntom ntawm cov yeeb yaj kiab nitride ntawm lub xov tooj ntawm tes;
② PID nyhuv ntawm N-hom crystalline silicon modules (TOPCon hlwb)
Cov nyhuv PID ntawm N-hom crystalline silicon modules tsis yog tshwm sim los ntawm migrating ions (Na +, Ca+2), tab sis los ntawm dielectric polarization ntawm passivation txheej tshwm sim los ntawm qhov sib txawv ntawm cov roj teeb thiab cov qauv module. Yog li ntawd, cov nyhuv PID ntawm N-hom crystalline silicon modules tuaj yeem tiv thaiv los ntawm kev qhia ib txheej passivation nrog ntau dua conductivity thiab qis dielectric tas li.
③ PID nyhuv ntawm HJT roj teeb Cheebtsam
Cov qauv ntawm HJT roj teeb yog txawv kiag li ntawm PERC thiab TOPCon. Cov txheej txheej passivation siv pob tshab oxide conductive zaj duab xis (TCO) es tsis txhob ntawm SiN4. Nyob rau hauv high voltage bias tej yam kev mob, tsis muaj insulating txheej rau sau nqi, yog li PID phenomenon yuav tsis tshwm sim. Yog li, HJT roj teeb muaj peev xwm tiv taus PID.