靜止(zhi)無功補(bu)償發生器是(shi)以IGBT為核心的SVG系統,是(shi)柔性交流輸電(dian)技術(Flexible AC Transmission System,簡(jian)稱(cheng)FACTS)的主要裝置之(zhi)一,它代表著現階(jie)段(duan)
電(dian)力(li)系統無功(gong)(gong)(gong)補償技術新的發展方向。SVG并(bing)聯于(yu)電(dian)網中,相(xiang)當(dang)于(yu)一個(ge)可(ke)(ke)控的無功(gong)(gong)(gong)電(dian)流(liu)源,其無功(gong)(gong)(gong)電(dian)流(liu)可(ke)(ke)以快速地跟(gen)隨負(fu)荷無功(gong)(gong)(gong)電(dian)流(liu)的變(bian)化而(er)變(bian)化,能夠快速連
續地提供容性和感性無功功率(lv),實現(xian)適當的電壓和無功功率(lv)控(kong)制(zhi),保(bao)障(zhang)電力(li)系統(tong)穩定、高效、優質地運(yun)行。
SVG利用可關(guan)斷(duan)大功率(lv)電(dian)(dian)力電(dian)(dian)子器件(如(ru)IGBT)組成自(zi)換相(xiang)橋式電(dian)(dian)路,經過(guo)電(dian)(dian)抗器并聯在電(dian)(dian)網上,適當地調節(jie)橋式電(dian)(dian)路交流側輸出電(dian)(dian)壓的幅值和相(xiang)位(wei),或者直接
控(kong)制其交流(liu)側(ce)電(dian)流(liu),就可以使該(gai)電(dian)路吸收或者發出滿足要求的無(wu)功電(dian)流(liu),實現(xian)動態無(wu)功補償的目的。