主电路母线和电容组寄生参数对开关暂态的影响

以一台H 桥IGBT 功率单元为对象，基于部分单元等效电路（PEEC）方法建立直流母线的高频等效电路，以基于最小二乘法的曲线拟合提取电容组的等效参数。以单桥臂电路实验中获得的桥臂电压的交流分量作为激励，施加于由母线和电容组模型构成的等效电路上进行仿真，用母线电流的实测波形与仿真波形进行比较验证等效电路的准确性。以此电路为基础，探讨了直流母线和电容组的结构与参数变化对暂态过程的影响以及暂态过程对寄生参数的敏感程度。结果表明，变换器的开关暂态过程对主电路母线和电容组的寄生电感参数的变化非常敏感。
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.
关键词﹕直流母线；电磁干扰；等效电路；变换器
Keywords: DC Power Bus; Electromagnetic Interference (EMI); Equivalent Circuit; Converter