電(dian)(dian)阻爐一(yi)般采(cai)(cai)用(yong)晶閘管(guan)來調(diao)控電(dian)(dian)流，以實現溫度控制。如(ru)果調(diao)功器中的晶閘管(guan)采(cai)(cai)取移相式(shi)觸發，則其次(ci)數較(jiao)高，補償(chang)回(hui)路中應當配備(bei)P值為5%或者7%的電(dian)(dian)抗器。如(ru)果企業內有大量的小(xiao)功率移相式(shi)電(dian)(dian)阻爐，這時企業低壓(ya)配電(dian)(dian)系統會產生嚴重(zhong)諧波污染。

生產(chan)型(xing)企業無功補(bu)償柜改造方案

在(zai)這個(ge)時(shi)候(hou)無(wu)功(gong)功(gong)率(lv)(lv)(lv)(lv)的(de)(de)補償器電(dian)(dian)阻的(de)(de)抵(di)抗(kang)(kang)就是呈現感(gan)(gan)性的(de)(de)，跟負(fu)載進行并聯(lian)之(zhi)后就可以會增大它的(de)(de)感(gan)(gan)抗(kang)(kang)性能，使(shi)得功(gong)率(lv)(lv)(lv)(lv)因數變(bian)(bian)小(xiao)，無(wu)功(gong)功(gong)率(lv)(lv)(lv)(lv)就相(xiang)對變(bian)(bian)大。使(shi)用IGBT與二極管作為功(gong)率(lv)(lv)(lv)(lv)變(bian)(bian)換元件(jian)，通過調節IGBT觸發脈沖(chong)PWM波的(de)(de)占空比，就能夠改(gai)變(bian)(bian)可變(bian)(bian)性電(dian)(dian)抗(kang)(kang)器實際(ji)阻抗(kang)(kang)的(de)(de)大小(xiao)，進而(er)可以實現電(dian)(dian)網系統無(wu)功(gong)補償的(de)(de)動態形式目標(biao)。

根據《全國供用(yong)(yong)電(dian)(dian)(dian)規則》和《電(dian)(dian)(dian)力(li)(li)系(xi)統(tong)電(dian)(dian)(dian)壓(ya)和無功(gong)電(dian)(dian)(dian)力(li)(li)技術導則》，均要求電(dian)(dian)(dian)力(li)(li)用(yong)(yong)戶(hu)(hu)的功(gong)率因(yin)(yin)數(shu)應達到下(xia)列規定：高(gao)壓(ya)供電(dian)(dian)(dian)的工(gong)業用(yong)(yong)戶(hu)(hu)和高(gao)壓(ya)供電(dian)(dian)(dian)裝有帶負(fu)荷調整電(dian)(dian)(dian)壓(ya)裝置(zhi)的電(dian)(dian)(dian)力(li)(li)用(yong)(yong)戶(hu)(hu)，其(qi)用(yong)(yong)戶(hu)(hu)交(jiao)接(jie)(jie)點處的功(gong)率因(yin)(yin)數(shu)為0.9以上；其(qi)他(ta)100kV·A(kW)及以上電(dian)(dian)(dian)力(li)(li)用(yong)(yong)戶(hu)(hu)和大、中(zhong)型電(dian)(dian)(dian)力(li)(li)排灌站(zhan)，其(qi)用(yong)(yong)戶(hu)(hu)交(jiao)接(jie)(jie)點處的功(gong)率因(yin)(yin)數(shu)為0.85以上。而《國家電(dian)(dian)(dian)網公司電(dian)(dian)(dian)力(li)(li)系(xi)統(tong)無功(gong)補償配置(zhi)技術原則》中(zhong)則規定：100kV·A及以上高(gao)壓(ya)供電(dian)(dian)(dian)的電(dian)(dian)(dian)力(li)(li)用(yong)(yong)戶(hu)(hu)，在用(yong)(yong)戶(hu)(hu)高(gao)峰時變壓(ya)器高(gao)壓(ya)側(ce)功(gong)率因(yin)(yin)數(shu)不宜(yi)低(di)于0.95；其(qi)他(ta)電(dian)(dian)(dian)力(li)(li)用(yong)(yong)戶(hu)(hu)，功(gong)率因(yin)(yin)數(shu)不宜(yi)低(di)于0.90。