Multi-level voltage sourced conversion by voltage reinjection at six times the fundamental frequency

The proposed multilevel voltage-sourced converter is based on the reinjection of DC voltage pulses at six times the fundamental frequency. The extra (xinjection) components required are justified by a substantial reduction in the capacitor size. It is shown that the resulting voltage and current harmonics are well within the present standards without the assistance of pulsewidth modulation. Theoretical waveforms are verified by computer simulation using the PSCADiEMTDC package.