In general how can one design a DC bus capacitor and a balancing capacitor for a flying capacitor multilevel inverter?
Dear Maulik,
Conceptually, one has to determine the capacitance C of the capacitor and its maximum operating voltage. In case of energy storage where it will be charged from a DC source and discharged into load, the charging and discharging time constant s and times are important in determining the ripples in the output voltage. Under steady state, and assuming the charging time is Tch and the discharging time to Tdis, then:
Ich. Tch= Idis . Tdis = C DV,
where Ich i the charging time , Idis is the discharging current, and DV is the peak ripple voltage. Using this concept you can estimate your capacitance value for specific applications.
Wish you success
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