Analysis and control of a multi-level flying capacitor inverter

The paper presents the results of a study into the optimal switch mode sequence for a multi-level flying capacitor inverter to synthesis a sinewave voltage under staircase angle control. It is shown that a properly selected sequence will yield the voltage and loss balances in capacitor voltages and switching devices respectively and minimize the load voltage THD values. A general mathematical model for an N-level inverter is presented which can be conveniently applied for computer simulation of any operating mode.