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Due to new grid codes for grid connected photovoltaic power generation, since 2012 PV inverters have to be able to feed in reactive power down to a power factor of cos(ϕ) = 0.9 besides their normal operation with pure active power [1]. In this paper the influence of different semiconductors on the power losses as function of the power factor will be studied on the base of a three-level MNPC topology...