并網(wang)逆(ni)變(bian)(bian)(bian)器(qi)(qi)以往對于無變(bian)(bian)(bian)壓(ya)器(qi)(qi)，又要(yao)(yao)供電(dian)(dian)(dian)(dian)(dian)到(dao)電(dian)(dian)(dian)(dian)(dian)網(wang)的(de)系(xi)統(tong)會有一些疑慮，主要(yao)(yao)是因為在直流電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)和交流電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)之間(jian)沒有電(dian)(dian)(dian)(dian)(dian)隔離（galvanicisolation），若直流端故(gu)障，會有大電(dian)(dian)(dian)(dian)(dian)流流到(dao)交流端。不(bu)過自2005年起，光伏(fu)逆(ni)變(bian)(bian)(bian)器(qi)(qi)，美國(guo)消防(fang)協會（NFPA）的(de)國(guo)家電(dian)(dian)(dian)(dian)(dian)氣規范允(yun)許無變(bian)(bian)(bian)壓(ya)器(qi)(qi)的(de)逆(ni)變(bian)(bian)(bian)器(qi)(qi)。VDE0126-1-1及IEC6210也已允(yun)許及定義這類(lei)系(xi)統(tong)需(xu)要(yao)(yao)的(de)安全機制(zhi)。首先，需(xu)要(yao)(yao)有殘留電(dian)(dian)(dian)(dian)(dian)流或是接地電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)以檢測(ce)異常短路(lu)(lu)(lu)的(de)情形，并且也要(yao)(yao)進(jin)行絕緣測(ce)試以確(que)認直流電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)與交流電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)之間(jian)的(de)分(fen)離。

光伏(fu)逆(ni)(ni)(ni)變(bian)(bian)(bian)器的(de)(de)功(gong)能有哪些呢(ni)？自動(dong)運行和停機(ji)功(gong)能早晨日出(chu)(chu)(chu)后，太(tai)(tai)陽(yang)輻射強度逐漸(jian)增強，太(tai)(tai)陽(yang)電池(chi)的(de)(de)輸(shu)(shu)出(chu)(chu)(chu)也隨之增大，當達到逆(ni)(ni)(ni)變(bian)(bian)(bian)器工作(zuo)所需的(de)(de)輸(shu)(shu)出(chu)(chu)(chu)功(gong)率(lv)后，集中式逆(ni)(ni)(ni)變(bian)(bian)(bian)器，逆(ni)(ni)(ni)變(bian)(bian)(bian)器即自動(dong)開始運行。進入運行后，光伏(fu)系(xi)統逆(ni)(ni)(ni)變(bian)(bian)(bian)器，逆(ni)(ni)(ni)變(bian)(bian)(bian)器便(bian)時時刻刻監視太(tai)(tai)陽(yang)電池(chi)組件(jian)的(de)(de)輸(shu)(shu)出(chu)(chu)(chu)，只要太(tai)(tai)陽(yang)電池(chi)組件(jian)的(de)(de)輸(shu)(shu)出(chu)(chu)(chu)功(gong)率(lv)大于(yu)逆(ni)(ni)(ni)變(bian)(bian)(bian)器工作(zuo)所需的(de)(de)輸(shu)(shu)出(chu)(chu)(chu)功(gong)率(lv)，亳州逆(ni)(ni)(ni)變(bian)(bian)(bian)器，逆(ni)(ni)(ni)變(bian)(bian)(bian)器就(jiu)持續運行；直(zhi)到日落停機(ji)，即使陰(yin)雨天逆(ni)(ni)(ni)變(bian)(bian)(bian)器也能運行。當太(tai)(tai)陽(yang)電池(chi)組件(jian)輸(shu)(shu)出(chu)(chu)(chu)變(bian)(bian)(bian)小，逆(ni)(ni)(ni)變(bian)(bian)(bian)器輸(shu)(shu)出(chu)(chu)(chu)接(jie)近0時，逆(ni)(ni)(ni)變(bian)(bian)(bian)器便(bian)形(xing)成待機(ji)狀(zhuang)態。

逆變(bian)(bian)器(qi)就是一種(zhong)將低壓(ya)(12或(huo)24伏或(huo)48伏)直流(liu)電(dian)(dian)轉變(bian)(bian)為220伏交流(liu)電(dian)(dian)的電(dian)(dian)子(zi)設備。因為我們(men)通常是將220伏交流(liu)電(dian)(dian)整流(liu)變(bian)(bian)成直流(liu)電(dian)(dian)來使用，而(er)逆變(bian)(bian)器(qi)的作用與(yu)此相反，因此而(er)得名。我們(men)處在(zai)一個“移(yi)(yi)動(dong)(dong)”的時代，移(yi)(yi)動(dong)(dong)辦公，移(yi)(yi)動(dong)(dong)通訊，移(yi)(yi)動(dong)(dong)休閑和娛樂(le)。在(zai)移(yi)(yi)動(dong)(dong)的狀態中，人們(men)不(bu)但需(xu)(xu)要由(you)電(dian)(dian)池或(huo)電(dian)(dian)瓶供給(gei)的低壓(ya)直流(liu)電(dian)(dian)，同時更需(xu)(xu)要我們(men)在(zai)日常環境中不(bu)可或(huo)缺(que)的220伏交流(liu)電(dian)(dian)，逆變(bian)(bian)器(qi)就可以滿足(zu)我們(men)的這種(zhong)需(xu)(xu)求。