A technique of parallel-connections of pulsewidth modulated NPC inverters by and using current sharing reactors

A technique of parallel-connection of power devices by using current sharing reactors for the pulse-width modulated (PWM) inverters is reported in this paper. The proposed technique not only increases current capacity but also reduces output harmonic content. The output voltage waveforms of the proposed inverter have certain voltage levels during their half cycles, thus it is anticipated that it will be difficult to analyze these output waveforms. For such waveforms, a frequency analysis approach is described, whose results are verified by experiments