一、變頻電源系統(tong)原理：

經過AC→DC→AC變(bian)換的(de)(de)(de)(de)逆變(bian)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)稱為(wei)變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)，它有(you)(you)別(bie)于(yu)(yu)用于(yu)(yu)電(dian)(dian)(dian)(dian)機(ji)調速用的(de)(de)(de)(de)變(bian)頻(pin)(pin)調速控制(zhi)器(qi)，也有(you)(you)別(bie)于(yu)(yu)普(pu)通交流穩壓(ya)(ya)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)。變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)的(de)(de)(de)(de)主要功(gong)用是將(jiang)現有(you)(you)交流電(dian)(dian)(dian)(dian)網電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)變(bian)換成所(suo)需(xu)頻(pin)(pin)率的(de)(de)(de)(de)穩定的(de)(de)(de)(de)純凈的(de)(de)(de)(de)正弦(xian)波電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)。理(li)想的(de)(de)(de)(de)交流電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)的(de)(de)(de)(de)特點是頻(pin)(pin)率穩定、電(dian)(dian)(dian)(dian)壓(ya)(ya)穩定、內阻(zu)等(deng)于(yu)(yu)零(ling)、電(dian)(dian)(dian)(dian)壓(ya)(ya)波形為(wei)純正弦(xian)波（無失真）。變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)十分接近于(yu)(yu)理(li)想交流電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)，因此，先(xian)進發達國(guo)家(jia)越來越多(duo)地將(jiang)變(bian)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)用作標準(zhun)供電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)，以便(bian)為(wei)用電(dian)(dian)(dian)(dian)器(qi)提供最(zui)優良的(de)(de)(de)(de)供電(dian)(dian)(dian)(dian)環境，便(bian)于(yu)(yu)客(ke)觀考核用電(dian)(dian)(dian)(dian)器(qi)的(de)(de)(de)(de)技術性(xing)能。

二、變頻電源主要有二大種類：?線性放大型和PWM開關型?

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三、變頻器的主要作用

變(bian)(bian)頻(pin)(pin)器(qi)(qi)(qi)是(shi)利用電(dian)(dian)(dian)(dian)力半導體器(qi)(qi)(qi)件的(de)通斷作(zuo)用將工頻(pin)(pin)電(dian)(dian)(dian)(dian)源變(bian)(bian)換為另一頻(pin)(pin)率的(de)電(dian)(dian)(dian)(dian)能控制裝置(zhi)。可(ke)分為交(jiao)(jiao)——交(jiao)(jiao)變(bian)(bian)頻(pin)(pin)器(qi)(qi)(qi)，交(jiao)(jiao)——直(zhi)——交(jiao)(jiao)變(bian)(bian)頻(pin)(pin)器(qi)(qi)(qi)。交(jiao)(jiao)——交(jiao)(jiao)變(bian)(bian)頻(pin)(pin)器(qi)(qi)(qi)可(ke)直(zhi)接把交(jiao)(jiao)流電(dian)(dian)(dian)(dian)變(bian)(bian)成頻(pin)(pin)率和電(dian)(dian)(dian)(dian)壓都可(ke)變(bian)(bian)的(de)交(jiao)(jiao)流電(dian)(dian)(dian)(dian)；交(jiao)(jiao)——直(zhi)——交(jiao)(jiao)變(bian)(bian)頻(pin)(pin)器(qi)(qi)(qi)則是(shi)先把交(jiao)(jiao)流電(dian)(dian)(dian)(dian)經整流器(qi)(qi)(qi)先整流成直(zhi)流電(dian)(dian)(dian)(dian)，再經過逆變(bian)(bian)器(qi)(qi)(qi)把這個直(zhi)流電(dian)(dian)(dian)(dian)流變(bian)(bian)成頻(pin)(pin)率和電(dian)(dian)(dian)(dian)壓都可(ke)變(bian)(bian)的(de)交(jiao)(jiao)流電(dian)(dian)(dian)(dian)?

?四、變頻電源與變頻器的區別

變頻電源的整個電路由交流一直流一交流一濾波等部分構成,因此它輸出的電壓和電流波形均為純正的正弦波,非常接近理想的交流供電電源。可以輸出世界任何國家的電網電壓和頻率。?
變(bian)(bian)頻器是由交(jiao)流一直流一交(jiao)流（調(diao)(diao)制波）等(deng)電(dian)路構成的(de),變(bian)(bian)頻器標(biao)準叫法應為(wei)變(bian)(bian)頻調(diao)(diao)速器。其輸出(chu)電(dian)壓(ya)的(de)波形為(wei)脈沖(chong)方波,且諧(xie)波成分(fen)多,電(dian)壓(ya)和頻率同(tong)時按比例(li)變(bian)(bian)化,不可分(fen)別調(diao)(diao)整,不符合交(jiao)流電(dian)源的(de)要求。原則上不能做(zuo)供電(dian)電(dian)源的(de)使(shi)用(yong),一般僅用(yong)于(yu)三相(xiang)異步電(dian)機的(de)調(diao)(diao)速