Nine-phase hex-tuple inverter for five-level output based on double carrier PWM technique

This work articulates double carrier based five-level pulsewidth modulation for a nine-phase hex-tuple inverter AC drive. A set of standard three-phase voltage source inverter (VSI) with slight modification is used for framing the ninephase AC drive. In particular VSI packed with one bidirectional device (MOSFET/IGBT) per phases and neutral point are established by linking two capacitors. A double carrier zero-shifted five-level pulse width modulation (DCZSFM) algorithm is adapted to regulate each VSI. Therefore, each VSI behaves as five-level output generator as a classical five-level multilevel inverter (MLI) types. Complete power modules along with modulation techniques are numerically developed in Matlab/PLECS software. Detailed set of results is provided in this paper on the basis of balanced operation and confirms the theoretical background always. Investigation of the nine-phase AC drives suits the needs of low-voltage/high current application to electric vehicle, traction systems and `More-Electric Aircraft'.