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Connecting power electronic devices to high voltage or high current grids has oriented relevant researches to a new challenge so called high power applications. To provide appropriate conditions to this aim, some new problems have been emerged. Multilevel power converter has been a proposed solution to increase output voltage level in the recent decades. However they really have some problems which are critically evaluated in this paper. A new solution to joint a power electronic device directly to a high voltage without any harmful effect is proposed as a high power application in the paper.