以一臺H 橋IGBT 功率單元為對象，基于部分單元等效電路（PEEC）方法建立直流母線的高頻等效電路，以基于最小二乘法的曲線擬合提取電容組的等效參數。以單橋臂電路實驗中獲得的橋臂電壓的交流分量作為激勵，施加于由母線和電容組模型構成的等效電路上進行仿真，用母線電流的實測波形與仿真波形進行比較驗證等效電路的準確性。以此電路為基礎，探討了直流母線和電容組的結構與參數變化對暫態過程的影響以及暫態過程對寄生參數的敏感程度。結果表明，變換器的開關暫態過程對主電路母線和電容組的寄生電感參數的變化非常敏感。
Abstract: The equivalent circuit of power DC bus and capacitor bank of an H-bridge IGBT unit was constructed, where the bus model was built with partial element equivalent circuit(PEEC) method and the parasitic parameters of capacitor tank were extracted by curve fitting using least square method. The equivalent circuit was verified by comparing the measured current with simulation result by exerting the AC component of phase voltage to the equivalent circuit. Furthermore, the? transient process with different parameters of the equivalent circuit was studied. It is proved that the transient process is very sensitive to parasitic inductance of the equivalent circuit.
關鍵詞﹕直流母線；電磁干擾；等效電路；變換器
Keywords: DC Power Bus; Electromagnetic Interference (EMI); Equivalent Circuit; Converter