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Summary Of Voltage Issues nyob rau hauv Photovoltaic Inverters

Nyob rau hauv daim phiaj photovoltaic txuas nrog inverters, muaj ntau qhov kev ntsuas hluav taws xob: qhov siab tshaj plaws DC input voltage, MPPT kev khiav hauj lwm voltage ntau, tag nrho cov load voltage ntau, pib voltage, rated input voltage, output voltage, thiab lwm yam. .Tsab ntawv xov xwm no qhia txog qee qhov teeb meem hluav taws xob ntawm photovoltaic inverters rau kev siv thiab kev sib pauv.

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Q: Qhov siab tshaj plaws DC input voltage

A: Kev txwv qhov siab tshaj plaws qhib hluav taws xob hluav taws xob ntawm txoj hlua, nws yuav tsum muaj qhov siab tshaj plaws qhib hluav taws xob hluav taws xob ntawm txoj hlua tsis tuaj yeem tshaj qhov siab tshaj plaws DC input voltage ntawm qhov kub tsawg kawg nkaus.Piv txwv li, yog tias qhov hluav taws xob qhib hluav taws xob ntawm cov khoom siv yog 38V, qhov kub coefficient yog -0.3% / ℃, thiab qhov hluav taws xob qhib hluav taws xob yog 43.7V ntawm rho tawm 25 ℃, ces qhov siab tshaj plaws ntawm 25 cov hlua tuaj yeem tsim.25 * 43.7 = 1092.5V.

Q: MPPT ua haujlwm voltage ntau

A: Lub inverter yog tsim los hloov mus rau qhov hloov pauv tsis tu ncua ntawm cov khoom.Qhov voltage ntawm cov khoom sib txawv raws li qhov kev hloov ntawm lub teeb thiab qhov kub thiab txias, thiab tus naj npawb ntawm cov khoom txuas nrog hauv series kuj tseem yuav tsum tau tsim los raws li qhov tshwj xeeb ntawm qhov project.Yog li ntawd, lub inverter tau teeb tsa kev ua haujlwm nyob rau hauv uas nws tuaj yeem ua haujlwm ib txwm.Qhov dav ntawm qhov voltage ntau, qhov dav dua qhov kev siv ntawm lub inverter.

Q: Full load voltage ntau yam

A: Nyob rau hauv qhov voltage ntau ntawm lub inverter, nws muaj peev xwm tso zis rated zog.Ntxiv nrog rau kev sib txuas ntawm photovoltaic modules, kuj tseem muaj qee qhov kev siv ntawm inverter.Lub inverter muaj qhov siab tshaj plaws input tam sim no, xws li 40kW, uas yog 76A.Tsuas yog thaum cov input voltage ntau tshaj 550V tuaj yeem tso zis mus txog 40kW.Thaum lub input voltage ntau tshaj 800V, lub tshav kub generated los ntawm poob nce sharply, ua rau lub inverter yuav tsum tau txo nws cov zis.Yog li cov hlua hluav taws xob yuav tsum tau tsim kom ntau li ntau tau nyob rau hauv nruab nrab ntawm tag nrho cov load voltage ntau.

Q: Pib voltage

A: Ua ntej pib lub inverter, yog tias cov khoom tsis ua haujlwm thiab nyob rau hauv lub xeev qhib, qhov voltage yuav kuj siab.Tom qab pib lub inverter, cov khoom yuav nyob rau hauv lub xeev ua hauj lwm, thiab qhov voltage yuav txo.Txhawm rau tiv thaiv lub inverter los ntawm kev pib dua, qhov pib voltage ntawm lub inverter yuav tsum siab tshaj qhov tsawg kawg nkaus ua hauj lwm voltage.Tom qab lub inverter pib, nws tsis txhais hais tias lub inverter yuav tam sim ntawd muaj zog tso zis.Kev tswj ib feem ntawm inverter, CPU, npo thiab lwm yam khoom ua haujlwm ua ntej.Ua ntej, lub inverter nws tus kheej kuaj xyuas, thiab tom qab ntawd xyuas cov khoom thiab daim phiaj fais fab.Tom qab tsis muaj teeb meem, lub inverter yuav muaj cov zis tsuas yog thaum lub zog photovoltaic tshaj lub zog standby ntawm lub inverter.
Qhov siab tshaj plaws DC input voltage yog siab tshaj qhov siab tshaj plaws ua hauj lwm voltage ntawm MPPT, thiab qhov pib voltage yog siab tshaj qhov tsawg kawg nkaus ua hauj lwm voltage ntawm MPPT.Qhov no yog vim hais tias ob qhov tsis zoo ntawm qhov siab tshaj plaws DC input voltage thiab pib voltage sib raug rau lub xeev qhib Circuit Court ntawm cov khoom, thiab qhov qhib hluav taws xob hluav taws xob ntawm cov khoom feem ntau yog li 20% siab dua qhov ua haujlwm voltage.

Q: Yuav ua li cas txiav txim siab qhov tso zis hluav taws xob thiab daim phiaj sib txuas hluav taws xob?

A: Qhov hluav taws xob DC tsis cuam tshuam nrog AC sab voltage, thiab ib qho kev hloov pauv photovoltaic inverter muaj AC tso zis ntawm 400VN / PE.Lub xub ntiag los yog tsis muaj ib qho kev sib cais transformer tsis cuam tshuam nrog cov zis voltage.Daim phiaj txuas nrog inverter tswj qhov tam sim no, thiab daim phiaj sib txuas hluav taws xob nyob ntawm daim phiaj hluav taws xob.Ua ntej daim phiaj sib txuas, lub inverter yuav ntes cov kab hluav taws xob hluav taws xob thiab tsuas yog txuas mus rau kab sib chaws yog tias nws ua tau raws li qhov xwm txheej.

Q: Dab tsi yog qhov kev sib raug zoo ntawm cov tswv yim thiab cov zis hluav taws xob?

A: Yuav ua li cas yog qhov tso zis voltage ntawm daim phiaj txuas nrog photovoltaic inverter tau li 270V?

Qhov siab tshaj plaws lub zog taug qab ntau yam ntawm lub zog siab inverter MPPT yog 420-850V, uas txhais tau hais tias cov zis hluav taws xob nce mus txog 100% thaum DC voltage yog 420V.
Lub ncov voltage (DC420V) yog hloov dua siab tshiab rau qhov zoo voltage ntawm alternating tam sim no, multiplied los ntawm lub conversion coefficient kom tau (AC270V), uas yog muaj feem xyuam rau lub voltage regulation ntau thiab mem tes dav tso zis lub voj voog ntawm cov zis sab.
Cov kev cai voltage ntau ntawm 270 (-10% mus rau 10%) yog: qhov siab tshaj plaws tso zis voltage ntawm DC sab DC420V yog AC297V;Txhawm rau kom tau txais txiaj ntsig zoo ntawm AC297V AC lub zog thiab DC voltage (nruab nrab AC voltage) ntawm 297 * 1.414 = 420V, qhov rov qab suav tuaj yeem tau txais AC270V.Cov txheej txheem yog: DC420V DC lub zog yog tswj los ntawm PWM (pulse width modulation) tom qab qhib thiab tawm (IGBT, IPM, thiab lwm yam), thiab tom qab ntawd lim kom tau txais lub zog AC.

Q: Puas yog photovoltaic inverters yuav tsum tsis muaj hluav taws xob caij?

A: General fais fab chaw nres tsheb hom photovoltaic inverters yuav tsum tsis tshua muaj hluav taws xob caij los ntawm kev ua haujlwm.

Thaum hluav taws xob tsis ua haujlwm lossis kev cuam tshuam ua rau muaj hluav taws xob poob ntawm kab sib txuas cov ntsiab lus ntawm cov cua ua liaj ua teb, cua turbines tuaj yeem ua haujlwm tsis tu ncua nyob rau hauv qhov ntau ntawm qhov hluav taws xob poob.Rau cov chaw tsim hluav taws xob photovoltaic, thaum lub zog hluav taws xob raug xwm txheej lossis cuam tshuam ua rau daim phiaj hluav taws xob poob qis, nyob rau hauv qee qhov ntau thiab lub sijhawm ntawm qhov hluav taws xob poob, photovoltaic fais fab nroj tsuag tuaj yeem ua kom muaj kev ua haujlwm tas mus li yam tsis muaj kev cuam tshuam los ntawm daim phiaj.

Q: Dab tsi yog qhov input voltage ntawm DC sab ntawm daim phiaj txuas nrog inverter?

A: Lub input voltage ntawm DC sab ntawm photovoltaic inverter sib txawv nrog cov load.Qhov tshwj xeeb input voltage muaj feem xyuam rau silicon wafer.Vim lub siab sab hauv ntawm silicon panels, thaum lub load tam sim no nce, qhov voltage ntawm silicon panels yuav txo sai heev.Yog li ntawd, nws yog ib qho tsim nyog yuav tsum muaj cov cuab yeej technology uas dhau los ua qhov kev tswj hwm lub zog siab tshaj plaws.Khaws cov zis hluav taws xob thiab qhov tam sim no ntawm lub vaj huam sib luag silicon nyob rau theem tsim nyog kom ntseeg tau tias cov khoom siv hluav taws xob ntau tshaj plaws.

Feem ntau, muaj kev pabcuam fais fab hauv lub photovoltaic inverter.Qhov kev pabcuam fais fab no feem ntau tuaj yeem pib thaum lub tswv yim DC voltage nce mus txog 200V.Tom qab pib ua haujlwm, lub zog tuaj yeem muab nkag mus rau hauv kev tswj hwm ntawm lub inverter, thiab lub tshuab nkag mus rau hom standby.
Feem ntau, thaum lub input voltage nce mus txog 200V lossis siab dua, lub inverter tuaj yeem pib ua haujlwm.Ua ntej, boost lub input DC mus rau ib tug tej yam voltage, ces invert nws mus rau hauv daim phiaj voltage thiab xyuas kom meej tias cov theem nyob twj ywm, thiab ces integrate rau hauv daim phiaj.Inverters feem ntau xav tau daim phiaj hluav taws xob kom qis dua 270Vac, txwv tsis pub lawv tsis tuaj yeem ua haujlwm zoo.Lub inverter grid kev twb kev txuas yuav tsum tau hais tias cov zis yam ntxwv ntawm lub inverter yog tam sim no tus yam ntxwv, thiab nws yuav tsum xyuas kom meej tias cov zis theem yog raws li AC theem ntawm lub hwj chim daim phiaj.


Post lub sij hawm: May-15-2024