DC link

[Syee]

Hi! I'm having a question here:

there is an intermediate link between the converter and the inverter, we usually call dc link or dc bus voltage. This link usually is just a capacitor.

I would like to know what is the main different between using two capacitor and use only one capacitor? What's the effect on the inverter switching output?(the waveform value in positive and negative portion)

;p;