A new N-level high voltage inversion system

This paper deals with a new multi-level high voltage source inverter using GTO thyristors. Recently, a multi-level approach seems to be best suited for implementing high voltage conversion systems because it leads to harmonic reduction and safely deals with high power conversion systems independent of the dynamic switching characteristics of each power semiconductor device. However, a conventional multi-level inverter has some problems; namely voltage unbalance between DC link capacitors and overvoltages across the inner switching devices. Therefore, the authors propose a novel structure of a multilevel inverter in order to improve these problems