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宣城(cheng)光伏逆變器-光伏逆變器回收-合肥烈(lie)陽l歡迎咨詢(多圖)

光伏(fu)逆(ni)變器的結構原理

逆變器(qi)是一種由(you)半導體器(qi)件組成的(de)電(dian)力調(diao)整裝置(zhi)，主要(yao)用于把直流電(dian)力轉換成交流電(dian)力。一般由(you)升壓回(hui)(hui)路和(he)逆變橋式(shi)回(hui)(hui)路構成。

升壓(ya)回(hui)(hui)路(lu)把太陽電池的(de)直(zhi)流(liu)(liu)(liu)電壓(ya)升壓(ya)到(dao)逆(ni)變(bian)(bian)(bian)器輸(shu)出控制所需(xu)的(de)直(zhi)流(liu)(liu)(liu)電壓(ya)；逆(ni)變(bian)(bian)(bian)橋(qiao)式回(hui)(hui)路(lu)則(ze)把升壓(ya)后的(de)直(zhi)流(liu)(liu)(liu)電壓(ya)等(deng)價(jia)地轉(zhuan)換成常用頻(pin)率的(de)交流(liu)(liu)(liu)電壓(ya)。逆(ni)變(bian)(bian)(bian)器主要由晶(jing)體(ti)管等(deng)開(kai)關(guan)元件(jian)構成，通過有規則(ze)地讓開(kai)關(guan)元件(jian)重復開(kai)-關(guan)（ON-OFF），使直(zhi)流(liu)(liu)(liu)輸(shu)入變(bian)(bian)(bian)成交流(liu)(liu)(liu)輸(shu)出。當然(ran)，這樣單(dan)純地由開(kai)和關(guan)回(hui)(hui)路(lu)產(chan)生的(de)逆(ni)變(bian)(bian)(bian)器輸(shu)出波形并不實用。

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視頻作者：合肥烈陽光伏技術有限公司

獨立(li)逆變(bian)器(qi)(qi)（Stand-alone inverters）：用在獨立(li)系(xi)(xi)統，光伏(fu)陣列為電(dian)(dian)池充電(dian)(dian)，逆變(bian)器(qi)(qi)以電(dian)(dian)池的直流(liu)(liu)(liu)(liu)電(dian)(dian)壓為能(neng)量來源。以往對(dui)于無變(bian)壓器(qi)(qi)，又要供電(dian)(dian)到電(dian)(dian)網(wang)的系(xi)(xi)統會有一(yi)些疑慮(lv)，主要是(shi)因為在直流(liu)(liu)(liu)(liu)電(dian)(dian)路(lu)和交流(liu)(liu)(liu)(liu)電(dian)(dian)路(lu)之間(jian)沒(mei)有電(dian)(dian)隔離（galvanic isolation），若直流(liu)(liu)(liu)(liu)端故障，會有大電(dian)(dian)流(liu)(liu)(liu)(liu)流(liu)(liu)(liu)(liu)到交流(liu)(liu)(liu)(liu)端。太(tai)陽(yang)能(neng)逆變(bian)器(qi)(qi)在電(dian)(dian)網(wang)電(dian)(dian)源跳電(dian)(dian)時，可以提(ti)供交流(liu)(liu)(liu)(liu)電(dian)(dian)源給的負載(zai)，因此需要有孤島效應(ying)保護(hu)機(ji)能(neng)。

許多獨立逆(ni)(ni)變(bian)(bian)器(qi)(qi)也整合(he)了(le)電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)，可以用(yong)交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)為電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)。一般這(zhe)種逆(ni)(ni)變(bian)(bian)器(qi)(qi)不(bu)會(hui)接觸(chu)到電(dian)(dian)(dian)(dian)(dian)網(wang)，因此也不(bu)需要孤(gu)島效應保(bao)護機(ji)能。并網(wang)逆(ni)(ni)變(bian)(bian)器(qi)(qi)會(hui)有安全(quan)設計(ji)，若(ruo)(ruo)未連(lian)接到電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)，會(hui)自動(dong)關閉輸出。若(ruo)(ruo)電(dian)(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)跳電(dian)(dian)(dian)(dian)(dian)，并網(wang)逆(ni)(ni)變(bian)(bian)器(qi)(qi)沒有備(bei)存(cun)供電(dian)(dian)(dian)(dian)(dian)的(de)(de)機(ji)能。物(wu)理上把(ba)(ba)將直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)能變(bian)(bian)換成交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)能的(de)(de)過程稱為逆(ni)(ni)變(bian)(bian)，把(ba)(ba)實現逆(ni)(ni)變(bian)(bian)過程的(de)(de)裝置稱為逆(ni)(ni)變(bian)(bian)設備(bei)或逆(ni)(ni)變(bian)(bian)器(qi)(qi)，逆(ni)(ni)變(bian)(bian)器(qi)(qi)的(de)(de)名稱由此而來(lai)。