Mu ma inverters olumikizidwa ndi ma photovoltaic grid, pali magawo ambiri aukadaulo wamagetsi: voteji yamagetsi yamagetsi yamagetsi yamagetsi yamagetsi yamagetsi, MPPT voteji osiyanasiyana, kuchuluka kwa voteji, voteji yoyambira, voliyumu yolowera, voliyumu yotulutsa, ndi zina zambiri. .Nkhaniyi ikufotokoza mwachidule nkhani zina za magetsi a ma photovoltaic inverters kuti afotokoze ndi kusinthana.
Q:Maximum DC input voltage
A: Kuchepetsa mphamvu yamagetsi yotseguka ya chingwe, pamafunika kuti voteji yotseguka kwambiri ya chingweyo isapitirire kuchuluka kwa voliyumu ya DC pa kutentha kochepa kwambiri.Mwachitsanzo, ngati lotseguka dera voteji wa chigawo chimodzi ndi 38V, koyefishienti kutentha ndi -0.3%/℃, ndi lotseguka dera voteji ndi 43.7V pa opanda 25 ℃, ndiye munthu pazipita 25 zingwe akhoza kupangidwa.25 * 43,7=1092.5V.
Q: MPPT ntchito voteji osiyanasiyana
A: Inverter idapangidwa kuti igwirizane ndi ma voliyumu omwe amasintha nthawi zonse.Mpweya wa zigawozo umasiyana malinga ndi kusintha kwa kuwala ndi kutentha, ndipo chiwerengero cha zigawo zomwe zimagwirizanitsidwa mndandanda ziyeneranso kupangidwa molingana ndi momwe polojekitiyi ikuyendera.Chifukwa chake, inverter yakhazikitsa njira yogwirira ntchito momwe ingagwire ntchito moyenera.Kuchuluka kwa ma voliyumu osiyanasiyana, kufalikira kwa inverter.
Q: Mtundu wamagetsi wathunthu
A: M'kati mwa voteji ya inverter, imatha kutulutsa mphamvu zovotera.Kuphatikiza pa kulumikiza ma module a photovoltaic, palinso ntchito zina za inverter.The inverter ali pazipita athandizira panopa, monga 40kW, amene ndi 76A.Pokhapokha mphamvu yolowera ikadutsa 550V imatha kufika 40kW.Mphamvu yolowera ikadutsa 800V, kutentha komwe kumapangidwa ndi zotayika kumawonjezeka kwambiri, zomwe zimapangitsa kuti inverter ikufunika kuchepetsa kutulutsa kwake.Chifukwa chake voteji ya chingwe iyenera kupangidwa momwe mungathere pakati pamtundu wonse wamagetsi.
Q: Voltage yoyambira
A: Musanayambe inverter, ngati zigawo sizikugwira ntchito ndipo zili mu dera lotseguka, magetsi adzakhala okwera kwambiri.Pambuyo poyambitsa inverter, zigawozo zidzakhala zikugwira ntchito, ndipo voteji idzachepa.Pofuna kupewa inverter kuti isayambe mobwerezabwereza, magetsi oyambira a inverter ayenera kukhala apamwamba kuposa magetsi ocheperako.Pambuyo poyambitsa inverter, sizikutanthauza kuti inverter idzatulutsa mphamvu nthawi yomweyo.Gawo lowongolera la inverter, CPU, skrini ndi zigawo zina zimagwira ntchito poyamba.Choyamba, inverter imadzifufuza, kenako imayang'ana zigawo ndi gridi yamagetsi.Pambuyo palibe mavuto, inverter idzakhala ndi zotuluka pokhapokha mphamvu ya photovoltaic iposa mphamvu ya standby ya inverter.
Mpweya wolowera kwambiri wa DC ndi wapamwamba kuposa mphamvu yamagetsi yogwira ntchito ya MPPT, ndipo magetsi oyambira ndi apamwamba kuposa magetsi ocheperapo a MPPT.Izi zili choncho chifukwa magawo awiri amagetsi owonjezera a DC ndi magetsi oyambira amafanana ndi dera lotseguka la gawolo, ndipo magetsi otseguka a gawoli nthawi zambiri amakhala pafupifupi 20% kuposa mphamvu yogwira ntchito.
Q:Kodi mungadziwe bwanji mphamvu yamagetsi ndi grid yolumikizira magetsi?
A : Magetsi a DC samakhudzana ndi voteji ya mbali ya AC, ndipo inverter wamba ya photovoltaic imakhala ndi AC yotulutsa 400VN/PE.Kukhalapo kapena kusapezeka kwa chosinthira chodzipatula sikukugwirizana ndi mphamvu yotulutsa.Gridi yolumikizidwa inverter imayang'anira zomwe zikuchitika, ndipo magetsi olumikizidwa ndi gridi amatengera mphamvu ya gridi.Asanalumikizidwe ndi gridi, inverter imazindikira mphamvu ya gridi ndikulumikizana ndi gridiyo ngati ikwaniritsa zomwe zili.
Q: Kodi pali ubale wotani pakati pa zolowetsa ndi zotulutsa?
A: Kodi mphamvu yotulutsa magetsi ya gridi yolumikizidwa ndi photovoltaic inverter idapezeka bwanji ngati 270V?
Kuchuluka kwamphamvu kotsata mphamvu ya inverter yamphamvu kwambiri MPPT ndi 420-850V, zomwe zikutanthauza kuti mphamvu yotulutsa imafika 100% pomwe magetsi a DC ndi 420V.
Mpweya wothamanga kwambiri (DC420V) umasinthidwa kukhala voteji yothandiza ya alternating current, kuchulukidwa ndi conversion coefficient kuti ipeze (AC270V), yomwe imagwirizana ndi ma voltage regulation range and pulse wide output duty cycle of the output side.
Mphamvu yamagetsi ya 270 (-10% mpaka 10%) ndi: magetsi apamwamba kwambiri pa DC mbali DC420V ndi AC297V;Kuti mupeze phindu lamphamvu la AC297V AC mphamvu ndi DC voteji (peak AC voteji) ya 297 * 1.414=420V, kuwerengetsera m'mbuyo kungapeze AC270V.Njirayi ndi: DC420V DC mphamvu imayang'aniridwa ndi PWM (kusinthasintha kwa pulse width) pambuyo poyatsidwa ndi kuzimitsidwa (IGBT, IPM, etc.), kenako amasefedwa kuti apeze mphamvu ya AC.
Q: Kodi ma inverters a photovoltaic amafunikira kukwera kwamagetsi otsika?
A: Magetsi ambiri amtundu wa photovoltaic inverters amafunikira kukwera kwamagetsi otsika kudzera muntchito.
Kuwonongeka kwa gridi yamagetsi kapena kusokonekera kumapangitsa kutsika kwamagetsi pamalo olumikizirana ndi gridi pamafamu amphepo, ma turbines amphepo amatha kugwira ntchito mosalekeza mkati mwa kutsika kwamagetsi.Kwa magetsi a photovoltaic, pamene ngozi yamagetsi kapena kusokonezeka kwamagetsi kumayambitsa kutsika kwa magetsi a gridi, mkati mwamtundu wina ndi nthawi ya madontho amagetsi, magetsi a photovoltaic amatha kuonetsetsa kuti ntchito ikupitirirabe popanda kuchotsedwa ku gridi.
Q: Kodi magetsi olowera mbali ya DC ya gridi yolumikizidwa ndi inverter ndi chiyani?
A: Magetsi olowera mbali ya DC ya inverter ya photovoltaic amasiyana ndi katundu.Mphamvu yeniyeni yolowera ikugwirizana ndi silicon wafer.Chifukwa cha kukana kwakukulu kwamkati kwa mapanelo a silicon, pomwe katundu akuchulukirachulukira, voteji ya mapanelo a silicon imachepa mwachangu.Choncho, m'pofunika kukhala ndi teknoloji yomwe imakhala yolamulira kwambiri.Sungani voliyumu yotulutsa ndi yapano ya gulu la silicon pamlingo woyenera kuti mutsimikizire kutulutsa kwamphamvu kwambiri.
Kawirikawiri, pali magetsi othandizira mkati mwa photovoltaic inverter.Mphamvu yothandizirayi imatha kuyambika pomwe magetsi a DC afika mozungulira 200V.Pambuyo poyambira, mphamvu imatha kuperekedwa kudera lamkati la inverter, ndipo makinawo amalowa moyimirira.
Nthawi zambiri, mphamvu yolowera ikafika 200V kapena kupitilira apo, inverter imatha kugwira ntchito.Choyamba, onjezerani zolowetsa za DC kumagetsi ena, kenaka mutembenuzire ku magetsi a gridi ndikuwonetsetsa kuti gawolo likhalebe lokhazikika, ndikuliphatikiza mu gridi.Ma inverters nthawi zambiri amafuna kuti magetsi a gridi akhale pansi pa 270Vac, apo ayi sangathe kugwira ntchito bwino.Kulumikizana kwa gridi ya inverter kumafuna kuti mawonekedwe a inverter ndizomwe zimayambira, ndipo ziyenera kuwonetsetsa kuti gawo lotulutsa likugwirizana ndi gawo la AC la gridi yamagetsi.
Nthawi yotumiza: May-15-2024