在直流電路中，電力無功補償器是相當于斷路的。電容器是一種能夠儲藏電荷的元件，也是最常用的電子元件之一。這得從電容器的結構上說起。最簡單的電容器是由兩端的極板和中間的絕緣電介質(包括空氣)構成的。江西無功補償器廠家通電(dian)(dian)(dian)(dian)后(hou)，極板帶電(dian)(dian)(dian)(dian)，形成電(dian)(dian)(dian)(dian)壓(電(dian)(dian)(dian)(dian)勢差)，但是(shi)由于中間(jian)的(de)(de)絕緣(yuan)物質，所以整個電(dian)(dian)(dian)(dian)容(rong)器是(shi)不導(dao)電(dian)(dian)(dian)(dian)的(de)(de)。不過，這樣(yang)的(de)(de)情況是(shi)在沒有超(chao)過電(dian)(dian)(dian)(dian)容(rong)器的(de)(de)臨界(jie)電(dian)(dian)(dian)(dian)壓(擊穿電(dian)(dian)(dian)(dian)壓)的(de)(de)前提條件(jian)下的(de)(de)。

電網中的電力負荷如電動機、變壓器等，大部分屬于感性負荷，在運行過程中需向這些設備提供相應的無功功率。在電網中安裝并聯電容器等電力無功補償器以后，可以提供感性負載所消耗的無功功率，減少了電網電源向感性負荷提供、由線路輸送的無功功率，由于減少了無功功率在電網中的流動，無功補償器廠家因此(ci)可以降低線路和變(bian)壓器因輸送無(wu)(wu)功(gong)功(gong)率造成的電(dian)能損耗，這就是無(wu)(wu)功(gong)補償。

電力無功補償器在改善供(gong)電(dian)(dian)(dian)(dian)(dian)系統(tong)中電(dian)(dian)(dian)(dian)(dian)網的(de)功(gong)率因數，減少(shao)供(gong)電(dian)(dian)(dian)(dian)(dian)變壓(ya)器和輸(shu)電(dian)(dian)(dian)(dian)(dian)線路(lu)的(de)損耗(hao)，提高供(gong)電(dian)(dian)(dian)(dian)(dian)效率以及改善供(gong)電(dian)(dian)(dian)(dian)(dian)環境(jing)方(fang)面(mian)發揮(hui)著(zhu)作用。合(he)理選擇(ze)補償裝置可以最(zui)大程度地減少(shao)電(dian)(dian)(dian)(dian)(dian)網損耗(hao)，提高電(dian)(dian)(dian)(dian)(dian)網質量。相反，選擇(ze)或(huo)使用不當可能會導致許多因素(su)，例如(ru)電(dian)(dian)(dian)(dian)(dian)源系統(tong)，電(dian)(dian)(dian)(dian)(dian)壓(ya)波動和諧(xie)波增加。

在新能源汽車充電樁建設領域，隨著新能源汽車的快速普及，充電樁大規模發展將導致充電諧波污染問題更為突出，對電網造成較大擾動。目前，充電樁設備基本都會標配相關的電力無功補償器來(lai)提(ti)高供電系統諧波(bo)承受能力，有條件的項目也會選(xuan)擇(ze)加裝有源濾波(bo)裝置。