A six-phase multilevel space vector PWM algorithm for a dual-inverter supplied drive

Multi-level drive supply can be realised in two different ways: by using either a conventional multi-level single-sided supply configuration or with a dual-inverter supply topology. The second structure is simpler for practical realisation, since the problem of capacitor voltage balancing does not arise. This paper develops a space vector pulse-width modulation (SVPWM) algorithm for the dual-inverter six-phase supply, based on two two-level six-phase voltage source inverters (VSIs), feeding a symmetrical six-phase load. In the algorithm, each inverter is controlled using SVPWM technique that was previously developed for a single-sided supply configuration. A multi-level output voltage is produced for a certain range of modulation index. The performance of the algorithm is verified through simulations and experiments.