Li-capacitor tsa lifilimi tsa YMIN: Li-Stabilizer tsa Voltage tse sebetsang hantle haholo bakeng sa li-Inverter tsa Photovoltaic PCS

Litsamaisong tse ncha tsa photovoltaic tsa eneji, sesebelisoa sa ho fetola matla (PCS) ke setsi sa mantlha bakeng sa phetoho e sebetsang hantle ea matla a photovoltaic DC ho ba matla a grid AC. Li-capacitor tsa lifilimi tsa YMIN, ka khanyetso ea tsona ea motlakase o phahameng, tahlehelo e tlase, le bophelo bo bolelele, ke likarolo tsa bohlokoa bakeng sa ho ntlafatsa ts'ebetso ea li-inverter tsa photovoltaic PCS, ho thusa limela tsa motlakase tsa photovoltaic ho fihlela phetoho e sebetsang hantle ea matla le tlhahiso e tsitsitseng. Mesebetsi ea tsona ea mantlha le melemo ea tekheniki ke tse latelang:

1. "Thebe ea ho Tsitsisa Voltage" bakeng sa DC-Link

Nakong ea ts'ebetso ea phetoho ea AC-DC ho li-inverter tsa PCS tsa photovoltaic, bese ea DC (DC-Link) e tlas'a maqhubu a phahameng a pulse le li-spikes tsa motlakase. Li-capacitor tsa filimi tsa YMIN li fana ka melemo ena ka:

• Ho Monya ha Voltage e Phahameng: Ka ho mamella voltage e phahameng ea 500V ho isa ho 1500V (e ka fetoloang), li monya li-spikes tsa voltage tse fetohang tse hlahisoang ke li-switch tsa IGBT/SiC, li sireletsa lisebelisoa tsa motlakase likotsing tsa ho senyeha.

• Ho Boreletsa Hona Joale ka ESR e Tlase: ESR e Tlase (1/10 ea li-capacitor tsa electrolytic tsa aluminium tsa setso) e monya hona joale ka katleho maqhubu a phahameng a maqhubu ho DC-Link, e fokotsa tahlehelo ea matla le ho ntlafatsa katleho ea phetoho ea matla.

• Sesebediswa sa ho Boloka Matla se nang le Bokgoni bo Hodimo: Sebaka se seholo sa bokgoni se dumella ho tjhaja le ho ntsha matla ka potlako nakong ya ho fetofetoha ha motlakase wa gridi, ho boloka botsitso ba motlakase wa bese ya DC le ho netefatsa tshebetso e tswelang pele ya PCS.

2. Tšireletso e habeli ea ho mamella Voltage e Phahameng le botsitso ba mocheso

Liteishene tsa motlakase tsa PV hangata li tobana le maemo a thata joalo ka mocheso o phahameng le mongobo o phahameng. Li-capacitor tsa lifilimi tsa YMIN li tobana le liphephetso tsena ka meralo e mecha:

• Ts'ebetso e Tsitsitseng ho pholletsa le Mefuta e Meholo ea Mocheso: Mocheso o sebetsang o koahela -40°C ho isa ho 105°C, ka sekhahla sa ho senyeha ha capacitance se ka tlase ho 5% libakeng tse nang le mocheso o phahameng, e leng se thibelang nako ea ho se sebetse ha sistimi ka lebaka la ho feto-fetoha ha mocheso.

• Bokgoni ba Hona Jwale ba Ripple: Bokgoni ba ho sebetsana le hona jwale ba Ripple bo feta makgetlo a 10 ho feta ba di-capacitor tsa electrolytic tsa setso, bo sefa lerata la harmonic ka katleho tlhahisong ya PV le ho netefatsa hore boleng ba matla a hokahantsweng le gridi bo fihlella maemo a naha.

• Bophelo bo Bolelele le ho se Hlokomele: Ka nako e telele ea bophelo ea lihora tse fihlang ho 100,000, e fetang lihora tse 30,000-50,000 tsa li-capacitor tsa aluminium electrolytic, sena se fokotsa litšenyehelo tsa ts'ebetso le tlhokomelo ea lifeme tsa motlakase tsa photovoltaic.

3. Tšebelisano-'moho le Lisebelisoa tsa SiC/IGBT

Ha litsamaiso tsa photovoltaic li ntse li fetoha ho ea ho li-voltage tse phahameng (meaho ea 1500V e ntse e tloaeleha), li-capacitor tsa YMIN tse tšesaane li lumellana ka botebo le li-semiconductor tsa motlakase tsa moloko o latelang:

• Tšehetso ea ho Fetola ka Maqhubu a Phahameng: Moralo oa ho kenya motlakase ka mokhoa o tlase o tsamaellana le litšobotsi tsa maqhubu a phahameng a SiC MOSFET (maqhubu a ho fetola motlakase > 20kHz), o fokotsa palo ea likarolo tse sa sebetseng le ho kenya letsoho ho fokotseng litsamaiso tsa PCS (tsamaiso ea 40kW e hloka li-capacitor tse 8 feela, ha e bapisoa le tse 22 bakeng sa litharollo tse thehiloeng ho silicon).

• Ho mamella dv/dt e ntlafetseng: Ho ntlafatsa ho ikamahanya le diphetoho tsa motlakase, ho thibela ho sisinyeha ha motlakase ho bakwang ke lebelo le feteletseng la ho chencha disebedisweng tsa SiC.

4. Boleng ba Boemo ba Sistimi: Tshebetso e Ntlafetseng ya Eneji le Ntlafatso ya Ditjeo

• Bokgoni bo Ntlafetseng: Moralo o tlase wa ESR o fokotsa tahlehelo ya mocheso, o eketsa bokgoni ba PCS ka kakaretso mme o eketsa haholo tlhahiso ya eneji ya selemo le selemo.

• Ho Boloka Sebaka: Moralo o matla haholo (o ka tlase ho 40% ho feta di-capacitor tsa setso) o tshehetsa moralo wa disebediswa tse nyane tsa PCS mme o fokotsa ditjeo tsa ho kenya.

Qetello

Li-capacitor tsa filimi tsa YMIN, ka melemo ea tsona ea mantlha ea mamello e phahameng ea motlakase, ho phahama ha mocheso o tlase, le tlhokomelo ea zero, li kopantsoe ka botebo likarolong tsa bohlokoa tsa li-inverter tsa li-PCS tsa photovoltaic, ho kenyeletsoa le DC-Link buffering, tšireletso ea IGBT, le ho sefa ha grid harmonic. Li sebetsa e le "mohlokomeli ea sa bonahaleng" oa ts'ebetso e sebetsang hantle le e tsitsitseng litsing tsa motlakase tsa photovoltaic. Theknoloji ea bona ha e khanne feela litsamaiso tsa polokelo ea matla a photovoltaic ho ea "ntle le tlhokomelo ho pholletsa le potoloho ea tsona ea bophelo," empa hape e thusa indasteri e ncha ea matla ho potlakisa phihlello ea parity ea grid le phetoho ea zero-carbon.