Multipulse inverter structures with low voltage distortion

A novel approach to the voltage source inverters (VSI) construction is presented in the paper. The invented inverter structures allow to operate several DC/AC converters in parallel resulting in lower voltage distortions at extremely low switching frequency. The research presented in the paper describes such a parallel operation of the VSI's which is possible thanks to the use of coupled inductors. The eighteen-pulse three-level converter was validated by the simulation and the prototype tests and the results of the examination are presented in the paper.