| 圖11 三電平NPC逆變器調(diào)速系統(tǒng)的仿真結(jié)果 |
5 結(jié)論
本文提出了基于參考電壓分解和零序電壓等效的新型多電平SVM算法。參考電壓分解的方法將參考電壓矢量分解成偏移矢量和二電平矢量兩部分,將任何電平數(shù)目的SVM算法都簡化成了一個二電平SVM算法的問題。針對開關(guān)狀態(tài)選擇問題,提出了將逆變器性能優(yōu)化控制目標(biāo)與平均輸出電壓零序分量建立聯(lián)系的新的問題解決策略,將開關(guān)狀態(tài)選擇問題轉(zhuǎn)化為零序電壓的選擇問題,并給出了具體的基于零序電壓等效的SVM開關(guān)狀態(tài)選擇方法。算法設(shè)計簡單,占用計算時間少,并對于任何電平數(shù)目都是通用的,并使開關(guān)狀態(tài)選擇問題與逆變器性能優(yōu)化控制得到有機(jī)結(jié)合。在TMS320C31 DSP脈沖發(fā)生器上實現(xiàn)了所提多電平SVM算法,驗證了它的可實現(xiàn)性及有效性。通過具體應(yīng)用實例的PSCAD/EMTDC仿真結(jié)果證明了所提SVM算法的有效性。
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