Dear researchers,
I'm trying to implement a two-level three phase inverter.., when I use a three phase resistive load, the output voltage VAN is accurate and it looks like the simulation. However, when I add three inductors to the load (inductive load), the output voltage is distorted and the load current is not sinusoidal (please see the attached images for illustration). I'm using six IGBT transistors IRF G4PC40FD, I think the problem comes from the freewheeling diode of the IGBT transistors. Should I use an antiparallel external diode to eliminate the internal diode of the IGBT ? If yes, please suggest us a practical schematic to get a sinusoidal shape current.
Due to the inductive load, there is an instant that the voltage polarity becomes positive and in the same time the current polarity is negative. Therefore, the current tries to go back to the DC source. Keep in mind that the IGBT can block small amont of the current, but your IGBT can be damged if the load inductive current increases
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