電(dian)(dian)(dian)(dian)(dian)能質量(liang)(liang)從(cong)嚴格(ge)意思上(shang)講，衡量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)能質量(liang)(liang)的(de)(de)主要指標有電(dian)(dian)(dian)(dian)(dian)壓(ya)、頻率和(he)波(bo)形。從(cong)普遍意義上(shang)講是(shi)(shi)指優質供電(dian)(dian)(dian)(dian)(dian)，包(bao)括電(dian)(dian)(dian)(dian)(dian)壓(ya)質量(liang)(liang)、電(dian)(dian)(dian)(dian)(dian)流質量(liang)(liang)、供電(dian)(dian)(dian)(dian)(dian)質量(liang)(liang)和(he)用電(dian)(dian)(dian)(dian)(dian)質量(liang)(liang)。為(wei)了(le)改(gai)善電(dian)(dian)(dian)(dian)(dian)能質量(liang)(liang)，需(xu)要采(cai)取相應(ying)的(de)(de)措施，并聯(lian)逆(ni)變器進(jin)行非線(xian)性負載(zai)諧波(bo)電(dian)(dian)(dian)(dian)(dian)流及(ji)無功補償使(shi)用的(de)(de)是(shi)(shi) PWM 電(dian)(dian)(dian)(dian)(dian)流控(kong)制(zhi)技術(shu)，起到(dao)調節電(dian)(dian)(dian)(dian)(dian)容直流電(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)作(zuo)用。而串聯(lian)逆(ni)變器使(shi)用的(de)(de)是(shi)(shi) PWM 電(dian)(dian)(dian)(dian)(dian)壓(ya)控(kong)制(zhi)技術(shu)，其主要是(shi)(shi)對輸出的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)進(jin)行控(kong)制(zhi)以(yi)達到(dao)抑制(zhi)諧波(bo)、降低(di)負荷的(de)(de)敏感程(cheng)度。

諧波嚴重(zhong)場合無功補(bu)償元件解決方案

在(zai)重載(zai)下，電壓(ya)將大幅度(du)下降(jiang)甚至系(xi)統垮臺。電壓(ya)下降(jiang)如引起低電壓(ya)保護動作，會導致(zhi)許(xu)多負荷停電。然(ran)而(er)(er)在(zai)輕載(zai)時，系(xi)統電容(rong)過(guo)補償，同步發電機短時間過(guo)激，引起變壓(ya)器(qi)(qi)飽和，它將產生過(guo)多的(de)諧(xie)波(bo)(bo)，如有可能會與(yu)電容(rong)器(qi)(qi)組(zu)、輸電線路(lu)等發生鐵磁諧(xie)振，這可能使避(bi)雷器(qi)(qi)動作和損(sun)壞(huai)、電容(rong)器(qi)(qi)和電動機因諧(xie)波(bo)(bo)而(er)(er)過(guo)熱、用戶設(she)備損(sun)壞(huai)。

母(mu)線(xian)除(chu)必要的(de)彎(wan)頭(tou)及(ji)斜(xie)度外，不允許(xu)有(you)彎(wan)曲(qu)(qu)和歪扭現象，要求(qiu)母(mu)線(xian)寬面彎(wan)曲(qu)(qu)度每(mei)米不大于2mm，窄面每(mei)米不大于3mm。母(mu)線(xian)表面不得有(you)明顯的(de)錘痕(hen)、銼(cuo)痕(hen)、劃痕(hen)。母(mu)線(xian)與電(dian)器元(yuan)件搭(da)接(jie)，母(mu)線(xian)應按電(dian)器元(yuan)件接(jie)線(xian)端子孔徑(jing)和孔數要求(qiu)。母(mu)線(xian)與電(dian)器元(yuan)件接(jie)線(xian)端根部(bu)應有(you)不小于5mm的(de)空出位置。