Abstract
In this paper, a flexible zero-sequence voltage (ZSV) injection method is presented for the silicon carbide (SiC)-based three-level electric starter/generator (ESG) system. The proposed algorithm can automatically adapt based on the op-erating conditions of the studied ESG system, thus not only capacitor voltages are kept balanced, but also the switching loss is reduced over a wide-speed range operation. Moreover, the abrupt commutation phenomenon that is a common issue for the state-of-the-art discontinuous pulse-width-modulation (DPWM) scheme operating in a low modulation index, is effectively avoided. The results of the simulation and experimental test validate the effectiveness and significant improvement of the introduced modulation technique for a next-generation high power-density aircraft three-level power generation unit.
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