高速永磁同步電動機由(you)高(gao)(gao)頻變(bian)頻器驅動(dong)，是(shi)典型的(de)(de)高(gao)(gao)校節能產(chan)品。高(gao)(gao)速永磁(ci)同步電(dian)(dian)(dian)動(dong)機的(de)(de)發(fa)電(dian)(dian)(dian)機與系(xi)統(tong)并(bing)聯運行時(shi)，可以認(ren)為是(shi)與無限(xian)大容量(liang)電(dian)(dian)(dian)源的(de)(de)母線運行，要改變(bian)發(fa)電(dian)(dian)(dian)機勵磁(ci)電(dian)(dian)(dian)流(liu)，感應(ying)電(dian)(dian)(dian)勢和定子電(dian)(dian)(dian)流(liu)也跟(gen)著變(bian)化(hua)，此時(shi)發(fa)電(dian)(dian)(dian)機的(de)(de)無功(gong)(gong)電(dian)(dian)(dian)流(liu)也跟(gen)著變(bian)化(hua)。當(dang)發(fa)電(dian)(dian)(dian)機與無限(xian)大容量(liang)系(xi)統(tong)并(bing)聯運行時(shi)，為了(le)改變(bian)發(fa)電(dian)(dian)(dian)機的(de)(de)無功(gong)(gong)功(gong)(gong)率，必(bi)須調節發(fa)電(dian)(dian)(dian)機的(de)(de)勵磁(ci)電(dian)(dian)(dian)流(liu)。此時(shi)改變(bian)的(de)(de)發(fa)電(dian)(dian)(dian)機勵磁(ci)電(dian)(dian)(dian)流(liu)并(bing)不是(shi)通常所說的(de)(de)“調壓”，而是(shi)只是(shi)改變(bian)了(le)送入(ru)系(xi)統(tong)的(de)(de)無功(gong)(gong)功(gong)(gong)率。