Mphamvu yamagetsi yomwe ili mbali ya DC ya mphamvu ya dzuwa ikuwonjezeka kufika ku 1500V, ndipo kulimbikitsa ndi kugwiritsa ntchito maselo a 210 kumapereka zofunika kwambiri pa chitetezo cha magetsi cha photovoltaic system yonse.Pambuyo voteji dongosolo chiwonjezeke, zimabweretsa zovuta kwa kutchinjiriza ndi chitetezo cha dongosolo, ndi kumawonjezera chiopsezo kutchinjiriza kuwonongeka kwa zigawo zikuluzikulu, mawaya inverter, ndi ma circuits mkati. zolakwika zofanana zimachitika.
Kuti zigwirizane ndi zigawo zomwe zikuchulukirachulukira, opanga ma inverter amawonjezera kulowetsedwa kwa chingwe kuchokera ku 15A kupita ku 20A. Pothetsa vuto la 20A lolowera pakali pano, wopanga inverter adakonza mapangidwe amkati a MPPT ndikuwonjezera mwayi wopezera chingwe cha. MPPT mpaka atatu kapena kuposerapo. Pankhani ya cholakwika, chingwecho chikhoza kukhala ndi vuto la kuyamwitsa panopa.Kuti athetse vutoli, kusintha kwa DC komwe kumakhala ndi "kutsekera kwanzeru kwa DC" kwatulukira monga momwe nthawi zimafunira.
01 Kusiyana pakati pa switch yachikhalidwe yodzipatula ndi switch yanzeru ya DC
Choyambirira, chosinthira chachikhalidwe cha DC chodzipatula chimatha kusweka mkati mwanthawi yapano, monga 15A mwadzina, kenako chimatha kuswa mphamvu yamagetsi ya 15A komanso mkati. , nthawi zambiri sichikhoza kusokoneza mphamvu yafupipafupi.
Kusiyanitsa kwakukulu pakati pa chosinthira chodzipatula ndi chophwanyira dera ndikuti woyendetsa dera amatha kuthyola nthawi yachidule, ndipo nthawi yaifupi yozungulira ngati vuto ndilokulirapo kuposa momwe amachitira pakali pano. ;Popeza kuti mawonekedwe afupipafupi a mbali ya photovoltaic DC nthawi zambiri amakhala pafupifupi 1.2 kuwirikiza pakali pano, masiwichi ena odzipatula kapena ma switch onyamula amathanso kuswa mphamvu yachidule ya mbali ya DC.
Pakadali pano, chosinthira chanzeru cha DC chomwe chimagwiritsidwa ntchito ndi inverter, kuphatikiza pa certification ya IEC60947-3, chimakumananso ndi kuphwanya kwamphamvu kwamtundu wina, komwe kumatha kusokoneza cholakwika chanthawi yayitali mkati mwamtundu wanthawi yayitali, mogwira mtima. amathetsa vuto la chingwe panopa backfeeding.Panthawi imodzimodziyo, chosinthira chanzeru cha DC chikuphatikizidwa ndi DSP ya inverter, kotero kuti gawo laulendo la chosinthira likhoza kuzindikira molondola komanso mwamsanga ntchito monga chitetezo cha overcurrent ndi chitetezo chafupipafupi.
Chithunzi chojambula chamagetsi cha smart DC switch
02 Dongosolo la mapangidwe a dzuwa limafuna kuti pamene chiwerengero cha njira zolowera za zingwe pansi pa MPPT iliyonse ndi ≥3, chitetezo cha fuse chiyenera kukhazikitsidwa pa mbali ya DC. ntchito ndi kukonza zosintha pafupipafupi ma fuse mbali ya DC.Ma inverters amagwiritsa ntchito ma switch anzeru a DC m'malo mwa fuse.MPPT imatha kulowetsa magulu atatu a zingwe.Pansi pazovuta kwambiri, padzakhala chiopsezo kuti panopa magulu a 2 a zingwe adzabwerera ku gulu la 1 la zingwe.Panthawiyi, chosinthira chanzeru cha DC chidzatsegula chosinthira cha DC kudzera pakutulutsa kwa shunt ndikuchichotsa munthawi yake.dera kuonetsetsa kuchotsa mwamsanga zolakwa.
Chithunzi chojambula cha MPPT string current backfeeding
The shunt release kwenikweni ndi koyilo yodumpha komanso chipangizo chodumpha, chomwe chimagwiritsa ntchito mphamvu yodziwika pa shunt tripping coil, ndipo kupyolera muzochita monga electromagnetic pull-in, DC switch actuator imagwedezeka kuti atsegule brake, ndi shunt kuigwedeza. Nthawi zambiri amagwiritsidwa ntchito pamagetsi akutali odzimitsa magetsi. Chosinthira chanzeru cha DC chikakhazikitsidwa pa inverter ya GoodWe, chosinthira cha DC chimatha kugwedezeka ndikutsegulidwa kudzera pa inverter DSP kuti ichotse chozungulira cha DC.
Kwa ma inverters omwe amagwiritsa ntchito chitetezo chaulendo wa shunt, ndikofunikira kuwonetsetsa kuti dera lowongolera la shunt coil limalandira mphamvu zowongolera zisanachitike ntchito yoteteza ulendo wa dera lalikulu.
03 Chiyembekezo chakugwiritsa ntchito kwanzeru DC switch
Pamene chitetezo cha mbali ya photovoltaic DC chikuwonjezeka pang'onopang'ono, ntchito zachitetezo monga AFCI ndi RSD zatchulidwa posachedwapa.Smart DC switch ndi yofunika mofanana.Cholakwika chikachitika, chosinthira chanzeru cha DC chimatha kugwiritsa ntchito bwino chiwongolero chakutali ndi malingaliro onse a switch yanzeru.Pambuyo pakuchita kwa AFCI kapena RSD, DSP idzatumiza chizindikiro chaulendo kuti iyendetse chosinthira cha DC DC.Pangani nthawi yopuma bwino kuti muwonetsetse chitetezo cha ogwira ntchito yosamalira.Kusintha kwa DC kukaphwanya mphamvu yayikulu, kumakhudza moyo wamagetsi wa switch.Mukamagwiritsa ntchito chosinthira chanzeru cha DC, kusweka kumangowononga moyo wamakina a switch ya DC, yomwe imateteza bwino moyo wamagetsi ndi kuthekera kozimitsa kwa arc kwa switch ya DC.
Kugwiritsa ntchito masiwichi anzeru a DC kumathandizanso kuti "kutsekeka kwa kiyi imodzi" kwa zida zosinthira m'nyumba zapakhomo; Chachiwiri, kudzera pamapangidwe a DSP control shutdown, pakachitika mwadzidzidzi, kusintha kwa DC kwa inverter kumatha kukhala mwachangu komanso kutsekedwa molondola kudzera pa chizindikiro cha DSP, ndikupanga malo odalirika osungira.
04 Chidule
Kugwiritsa ntchito masiwichi anzeru a DC kumathetsa vuto lachitetezo cha kubweza komweku, koma ngati ntchito yodutsa kutali ingagwiritsidwe ntchito pazinthu zina zogawidwa komanso zapakhomo kuti apange chitsimikizo chodalirika cha ntchito ndi kukonza ndikuwongolera chitetezo cha ogwiritsa ntchito pakagwa mwadzidzidzi.Kutha kuthana ndi zolakwika kumafunikirabe kugwiritsa ntchito ndi kutsimikizira ma switch anzeru a DC pamsika.
Nthawi yotumiza: Feb-16-2023