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一般來說，無功(gong)(gong)補償裝(zhuang)置(zhi)是一種無功(gong)(gong)電(dian)源。

低壓功(gong)率(lv)因數大于0.85，高壓功(gong)率(lv)因數大于0.9。為了(le)克服(fu)無(wu)(wu)功(gong)損耗，有必要采用無(wu)(wu)功(gong)補(bu)償(chang)裝(zhuang)置(zhi)(zhi)來(lai)解(jie)決。電(dian)(dian)力系統中有兩種無(wu)(wu)功(gong)補(bu)償(chang)裝(zhuang)置(zhi)(zhi)：無(wu)(wu)功(gong)靜態補(bu)償(chang)裝(zhuang)置(zhi)(zhi)和無(wu)(wu)功(gong)動態補(bu)償(chang)裝(zhuang)置(zhi)(zhi)。前(qian)者包括并聯電(dian)(dian)容器和并聯電(dian)(dian)抗器。

后者(zhe)包括(kuo)同步補(bu)償（調相器）和靜止無功動態補(bu)償（SVS）。

并(bing)聯(lian)電抗器的功能如(ru)下：

1）吸收(shou)電(dian)(dian)(dian)容(rong)電(dian)(dian)(dian)流，補償(chang)(chang)電(dian)(dian)(dian)容(rong)無功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)，實現無功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)平(ping)衡；2）減弱電(dian)(dian)(dian)容(rong)效(xiao)應，限制系統工(gong)頻電(dian)(dian)(dian)壓上(shang)升和(he)工(gong)作過(guo)電(dian)(dian)(dian)壓。缺(que)點是，當(dang)線(xian)路(lu)的(de)(de)傳輸功(gong)(gong)(gong)率(lv)接(jie)(jie)近自然功(gong)(gong)(gong)率(lv)時，具(ju)有固定(ding)容(rong)量(liang)的(de)(de)并聯電(dian)(dian)(dian)抗器(qi)將導致(zhi)過(guo)大的(de)(de)電(dian)(dian)(dian)壓降低和(he)額外的(de)(de)有功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)損(sun)失，但如(ru)果將其移(yi)除，線(xian)路(lu)在某些(xie)情況下可(ke)能會失去補償(chang)(chang)，產生不可(ke)接(jie)(jie)受的(de)(de)輸出(chu)功(gong)(gong)(gong)率(lv)。電(dian)(dian)(dian)壓過(guo)高(gao)。

改(gai)進的方法(fa)是(shi)采用可控電抗器，通過(guo)控制(zhi)回路中(zhong)的直流勵磁改(gai)變鐵(tie)心（即工作點）的飽和(he)，從而(er)實現(xian)無(wu)功(gong)輸出的平穩(wen)調節。工業(ye)應(ying)用

1.同(tong)步電(dian)動機和同(tong)步調相器(qi)；移相電(dian)容器(qi)，目(mu)前(qian)多為移相電(dian)容器(qi)。