Abstract
A multi-level inverter has advantages in high blocking voltages and reduced harmonics. However, it needs more complex technical challenges in the utilization of redundant switching vectors as its level is increased.This paper proposes a general space-vector (SV) modulation method for the optimal reduction of the switching losses in three-phase PWM inverter of an arbitrary n-level type. The proposed method consists of two steps. One is the general principle for generation of the SV map for an arbitrary n-level type. The other is the optimal selection of the SV pattern which minimizes the switching losses considering the three-phase currents based on the two-phase modulation method. Simulated examples controlled according to the proposed method are shown for some different levels.
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