Ho li-inverters tse hokahaneng tsa gridi ea photovoltaic, ho na le litekanyo tse ngata tsa tekheniki ea motlakase: boholo ba motlakase oa motlakase oa DC, mofuta oa motlakase o sebetsang oa MPPT, mofuta o felletseng oa matla a motlakase, motlakase o qalang, motlakase o kentsoeng o lekantsoeng, motlakase o hlahisoang, joalo-joalo. .Sengoliloeng sena se akaretsa litaba tse ling tsa motlakase oa li-inverters tsa photovoltaic bakeng sa litšupiso le phapanyetsano.
P: Matla a phahameng a ho kenya a DC
A: Ho fokotsa matla a mangata a bulehileng a potoloho ea mohala, ho hlokahala hore matla a mangata a bulehileng a potoloho a khoele a se ke a feta matla a mangata a ho kenya letsoho a DC mocheso o fokolang haholo.Ka mohlala, haeba motlakase oa potoloho o bulehileng oa karolo e le 38V, mocheso oa mocheso ke -0.3% / ℃, 'me motlakase oa potoloho o bulehileng ke 43.7V ho tloha ho 25 ℃, joale ho ka thehoa likhoele tse 25.25 * 43.7=1092,5V.
Q: Mofuta oa motlakase o sebetsang oa MPPT
A: Inverter e etselitsoe ho ikamahanya le motlakase o lulang o fetoha oa likarolo.Matla a likarolo a fapana ho ea ka liphetoho tsa leseli le mocheso, 'me palo ea likarolo tse hokahaneng letotong le tsona li hloka ho raloa ho latela maemo a itseng a morero.Ka hona, inverter e behile sebaka sa ho sebetsa moo se ka sebetsang ka mokhoa o tloaelehileng.Ha lebelo la motlakase le pharalla, ho na le ts'ebetso e pharaletseng ea inverter.
P: Mofuta o felletseng oa matla a motlakase
A: Ka har'a mefuta ea motlakase ea inverter, e ka ntša matla a lekantsoeng.Ntle le ho hokahanya li-module tsa photovoltaic, ho boetse ho na le lisebelisoa tse ling tsa inverter.Inverter e na le boholo ba hona joale ba ho kenya, joalo ka 40kW, e leng 76A.Ke feela ha motlakase o kenang o feta 550V moo tlhahiso e ka fihlang 40kW.Ha motlakase o kenang o feta 800V, mocheso o hlahisoang ke tahlehelo o eketseha haholo, o lebisang ho inverter e hlokang ho fokotsa tlhahiso ea eona.Kahoo motlakase oa likhoele o lokela ho raloa ka hohle kamoo ho ka khonehang bohareng ba mefuta e felletseng ea matla a motlakase.
P: Voltage e qala
A: Pele o qala inverter, haeba likarolo li sa sebetse 'me li le maemong a potoloho e bulehileng, motlakase o tla ba holimo haholo.Ka mor'a ho qala inverter, likarolo li tla be li sebetsa, 'me motlakase o tla fokotseha.Ho thibela inverter hore e se ke ea qala khafetsa, motlakase oa ho qala oa inverter o lokela ho ba o phahameng ho feta matla a fokolang a sebetsang.Kamora hore inverter e qale, ha ho bolele hore inverter e tla ba le tlhahiso ea matla hanghang.Karolo ea taolo ea inverter, CPU, skrini le likarolo tse ling li sebetsa pele.Taba ea pele, inverter e itlhahloba, ebe e hlahloba likarolo le grid ea matla.Ka mor'a hore ho se na mathata, inverter e tla ba le tlhahiso feela ha matla a photovoltaic a feta matla a standby a inverter.
Motlakase o moholo oa motlakase oa DC o phahame ho feta matla a mangata a sebetsang a MPPT, 'me motlakase oa ho qala o phahame ho feta bonyane ba motlakase o sebetsang oa MPPT.Lebaka ke hore liparamente tse peli tsa boholo ba motlakase oa motlakase oa DC le motlakase o qalang li lumellana le boemo ba potoloho e bulehileng ea karolo, 'me motlakase oa potoloho o bulehileng oa karolo hangata o phahame ka 20% ho feta motlakase o sebetsang.
P: U ka tseba joang hore na motlakase o hlahisoang le motlakase oa khokahano ea grid?
A: Motlakase oa DC ha o amane le motlakase oa lehlakoreng la AC, 'me mochine o tloaelehileng oa motlakase oa photovoltaic o na le tlhahiso ea AC ea 400VN/PE.Ho ba teng kapa ho ba sieo ha transformer ea ho itšehla thajana ha e amane le motlakase oa tlhahiso.Grid e kopantsoeng inverter e laola hona joale, 'me motlakase o kopantsoeng oa grid o itšetlehile ka matla a marang-rang.Pele ho khokahanyo ea marang-rang, inverter e tla lemoha motlakase oa marang-rang ebe e hokela feela grid haeba e kopana le maemo.
P: Kamano ke efe lipakeng tsa voltage ea input le output?
A: Voltage e hlahisoang ke grid e hokahaneng ea photovoltaic inverter e fumanoe joang e le 270V?
Lebelo le phahameng la ho latela matla a motlakase oa motlakase oa MPPT ke 420-850V, ho bolelang hore matla a tsoang a fihla ho 100% ha motlakase oa DC o le 420V.
The peak voltage (DC420V) e fetoleloa ho motlakase o sebetsang oa motlakase o feto-fetohang, o atisoa ke coefficient ea phetoho ho fumana (AC270V), e amanang le mefuta ea taolo ea motlakase le pulse wide output duty cycle of the output side.
Mofuta oa taolo ea motlakase oa 270 (-10% ho isa ho 10%) ke: matla a phahameng ka ho fetisisa a tsoang lehlakoreng la DC DC420V ke AC297V;Ho fumana boleng bo sebetsang ba matla a AC297V AC le motlakase oa DC (peak AC voltage) ea 297 * 1.414=420V, lipalo tse ka morao li ka fumana AC270V.Tshebetso ke: Matla a DC420V DC a laoloa ke PWM (pulse width modulation) ka mor'a ho buloa le ho tima (IGBT, IPM, joalo-joalo), ebe o sefshoa ho fumana matla a AC.
P: Na li-inverters tsa photovoltaic li hloka ho palama ha motlakase o tlase?
A: Li-inverters tsa motlakase tse akaretsang tsa mofuta oa photovoltaic li hloka ho palama motlakase o tlase ka ts'ebetso.
Ha mathata a marang-rang a motlakase kapa litšitiso li baka ho theoha ha motlakase libakeng tsa khokahano ea marang-rang ea mapolasi a moea, li-turbine tsa moea li ka sebetsa ka nako e telele ka har'a mefuta e mengata ea ho theoha ha motlakase.Bakeng sa limela tsa matla a photovoltaic, ha likotsi tsa tsamaiso ea matla kapa litšitiso li baka marotholi a marang-rang a marang-rang, ka har'a mefuta e itseng le nako ea nako ea marotholi a motlakase, limela tsa matla a photovoltaic li ka etsa bonnete ba hore ts'ebetso e tsoelang pele ntle le ho khaoha ho tloha marang-rang.
P: Ke motlakase ofe o kenang ka lehlakoreng la DC la grid e hokahaneng inverter?
A : Matla a ho kenya ka lehlakoreng la DC la inverter ea photovoltaic e fapana le mojaro.Matla a khethehileng a ho kenya a amana le silicon wafer.Ka lebaka la khanyetso e phahameng ea ka hare ea liphanele tsa silicon, ha moroalo o ntse o eketseha, motlakase oa liphanele tsa silicon o tla fokotseha ka potlako.Ka hona, hoa hlokahala ho ba le theknoloji e fetohang taolo e phahameng ea matla a matla.Boloka motlakase o hlahisoang le hona joale oa phanele ea silicon e le maemong a loketseng ho netefatsa tlhahiso e phahameng ea matla.
Hangata, ho na le motlakase o thusang ka hare ho photovoltaic inverter.Phepelo ena e thusang hangata e ka qalisoa ha motlakase oa DC o kenang o fihla ho 200V.Kamora ho qala, matla a ka fanoa ho potoloho ea taolo ea kahare ea inverter, 'me mochini o kena ka mokhoa oa standby.
Ka kakaretso, ha motlakase o kenang o fihla ho 200V kapa ka holimo, inverter e ka qala ho sebetsa.Ntlha ea pele, eketsa motlakase oa DC ho ea ho motlakase o itseng, ebe o o fetisetsa ho motlakase oa marang-rang 'me u netefatse hore mohato o lula o le teng, ebe o o kopanya ka har'a marang-rang.Hangata li-inverters li hloka hore voltage ea grid e be ka tlase ho 270Vac, ho seng joalo e ke ke ea sebetsa hantle.Khokahano ea grid ea inverter e hloka hore tšobotsi e hlahisoang ke inverter ke tšobotsi ea hajoale ea mohloli, 'me e tlameha ho netefatsa hore karolo ea tlhahiso e tsamaellana le karolo ea AC ea grid ea matla.
Nako ea poso: May-15-2024