;目前(qian),發電(dian)(dian)(dian)(dian)廠和變(bian)電(dian)(dian)(dian)(dian)站的電(dian)(dian)(dian)(dian)力操(cao)作(zuo)電(dian)(dian)(dian)(dian)源采(cai)用直流電(dian)(dian)(dian)(dian)源,直流屏為(wei)該直流電(dian)(dian)(dian)(dian)源供電(dian)(dian)(dian)(dian)。為(wei)控制負荷、電(dian)(dian)(dian)(dian)