Abstract
This paper presents investigation of a new Phase
shifted PWM technique with improved harmonic suppression. A
novel balance circuit for DC – link voltage balance of two three
level legs connected back – to back is designed and tested.
Combined with the individual voltage control, a complete voltage
controller is developed for a cascaded nine level hybrid model
with two cells. Robustness of the proposed algorithm under
varying operating conditions and modulation indices is verified
by simulation.