描述
試驗(yàn)中首先對直流母線預(yù)充電以免造成沖擊,然后啟動(dòng)網(wǎng)側(cè)控制程序,建立直流母線,再啟動(dòng)機(jī)側(cè)控制程序,之后斷開直流負(fù)載,完成機(jī)側(cè)和網(wǎng)側(cè)變流器能量交換,試驗(yàn)波形如圖6所示。圖6中直流母線電壓穩(wěn)定在450v,達(dá)到最低母線電壓要求,機(jī)側(cè)電壓和母線電壓檢測通過高壓差分探頭,連接到永磁電機(jī)三相輸出端和直流母線兩端。通過變頻器提高拖動(dòng)三相異步電機(jī)轉(zhuǎn)速從而提高永磁同步發(fā)電機(jī)的轉(zhuǎn)速,隨著轉(zhuǎn)速提高逐漸加大發(fā)電輸出功率。當(dāng)電機(jī)達(dá)到額定轉(zhuǎn)速時(shí),電機(jī)側(cè)pwm電壓波形及輸出電流波形如圖6(a)。圖6(b)示出了發(fā)電機(jī)輸出滿功率時(shí)機(jī)側(cè)和網(wǎng)側(cè)電流波形,這里q軸電流給定為0,進(jìn)行單位功率因數(shù)發(fā)電。電流探頭選擇100mv/a的檔位,從圖6中可以看出電機(jī)側(cè)及電網(wǎng)側(cè)變流器電流控制良好。
6 結(jié)束語
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