光伏逆變器不僅具(ju)有(you)直交流(liu)(liu)變換功(gong)(gong)(gong)(gong)能，還具(ju)有(you)最大限度地發揮(hui)太(tai)陽電池性能的功(gong)(gong)(gong)(gong)能和(he)系(xi)(xi)統故障保護(hu)功(gong)(gong)(gong)(gong)能。歸(gui)納(na)起來有(you)自(zi)動運行(xing)和(he)停機(ji)功(gong)(gong)(gong)(gong)能、最大功(gong)(gong)(gong)(gong)率跟蹤控(kong)(kong)制功(gong)(gong)(gong)(gong)能、防(fang)單獨運行(xing)功(gong)(gong)(gong)(gong)能(并網(wang)系(xi)(xi)統用(yong))、自(zi)動電壓調整功(gong)(gong)(gong)(gong)能(并網(wang)系(xi)(xi)統用(yong))、直流(liu)(liu)檢(jian)測功(gong)(gong)(gong)(gong)能(并網(wang)系(xi)(xi)統用(yong))、直流(liu)(liu)接地檢(jian)測功(gong)(gong)(gong)(gong)能(并網(wang)系(xi)(xi)統用(yong))。這里簡單介紹自(zi)動運行(xing)和(he)停機(ji)功(gong)(gong)(gong)(gong)能及最大功(gong)(gong)(gong)(gong)率跟蹤控(kong)(kong)制功(gong)(gong)(gong)(gong)能。

自(zi)動運(yun)行和停機功能

早晨日(ri)出(chu)(chu)(chu)(chu)后(hou)(hou)，太(tai)(tai)陽(yang)(yang)輻射(she)強(qiang)度逐漸增(zeng)強(qiang)，太(tai)(tai)陽(yang)(yang)電(dian)池(chi)的(de)(de)輸(shu)出(chu)(chu)(chu)(chu)也(ye)隨之增(zeng)大(da)，當達到(dao)逆(ni)變(bian)(bian)器(qi)(qi)工作(zuo)所(suo)需的(de)(de)輸(shu)出(chu)(chu)(chu)(chu)功率后(hou)(hou)，逆(ni)變(bian)(bian)器(qi)(qi)即自動(dong)開始運(yun)(yun)行(xing)。進入運(yun)(yun)行(xing)后(hou)(hou)，逆(ni)變(bian)(bian)器(qi)(qi)便時時刻刻監視太(tai)(tai)陽(yang)(yang)電(dian)池(chi)組(zu)件(jian)的(de)(de)輸(shu)出(chu)(chu)(chu)(chu)，只要太(tai)(tai)陽(yang)(yang)電(dian)池(chi)組(zu)件(jian)的(de)(de)輸(shu)出(chu)(chu)(chu)(chu)功率大(da)于(yu)逆(ni)變(bian)(bian)器(qi)(qi)工作(zuo)所(suo)需的(de)(de)輸(shu)出(chu)(chu)(chu)(chu)功率，逆(ni)變(bian)(bian)器(qi)(qi)就(jiu)持(chi)續(xu)運(yun)(yun)行(xing);直到(dao)日(ri)落(luo)停機(ji)，即使陰雨天(tian)逆(ni)變(bian)(bian)器(qi)(qi)也(ye)能運(yun)(yun)行(xing)。當太(tai)(tai)陽(yang)(yang)電(dian)池(chi)組(zu)件(jian)輸(shu)出(chu)(chu)(chu)(chu)變(bian)(bian)小(xiao)，逆(ni)變(bian)(bian)器(qi)(qi)輸(shu)出(chu)(chu)(chu)(chu)接近(jin)0時，逆(ni)變(bian)(bian)器(qi)(qi)便形成待機(ji)狀(zhuang)態。

最大功(gong)率(lv)跟蹤控制功(gong)能

太(tai)(tai)陽(yang)(yang)電(dian)(dian)(dian)池(chi)(chi)組件(jian)的(de)輸出是(shi)隨太(tai)(tai)陽(yang)(yang)輻射(she)強度和太(tai)(tai)陽(yang)(yang)電(dian)(dian)(dian)池(chi)(chi)組件(jian)自身溫(wen)度(芯片(pian)溫(wen)度)而變化(hua)(hua)的(de)。另外由于太(tai)(tai)陽(yang)(yang)電(dian)(dian)(dian)池(chi)(chi)組件(jian)具有電(dian)(dian)(dian)壓隨電(dian)(dian)(dian)流(liu)增大而下降(jiang)的(de)特性(xing)，因此存(cun)在能獲(huo)取最(zui)大功(gong)率的(de)最(zui)佳工(gong)作(zuo)點(dian)。太(tai)(tai)陽(yang)(yang)輻射(she)強度是(shi)變化(hua)(hua)著的(de)，顯然最(zui)佳工(gong)作(zuo)點(dian)也是(shi)在變化(hua)(hua)的(de)。相(xiang)對于這些變化(hua)(hua)，始終讓(rang)太(tai)(tai)陽(yang)(yang)電(dian)(dian)(dian)池(chi)(chi)組件(jian)的(de)工(gong)作(zuo)點(dian)處于最(zui)大功(gong)率點(dian)，系統(tong)始終從太(tai)(tai)陽(yang)(yang)電(dian)(dian)(dian)池(chi)(chi)組件(jian)獲(huo)取最(zui)大功(gong)率輸出，這種(zhong)控(kong)制(zhi)就是(shi)最(zui)大功(gong)率跟蹤(zong)控(kong)制(zhi)。太(tai)(tai)陽(yang)(yang)能發電(dian)(dian)(dian)系統(tong)用的(de)逆變器的最大特點(dian)就是包括了最大功率點(dian)跟蹤(MPPT)這一功能。

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