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Single and Multi-Phase Inverters

D12.12 - Study and Implementation of a Three-Phase Three-Level NPC Inverter with Leakage Current Suppression

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
This research aims to suppress leakage current caused by common-mode voltage (CMV) across stray capacitance in a three-phase three-level neutral-point clamped inverter. Using the two medium vectors and one zero vector (2MV1Z) pulse width modulation, which exhibits lower CMV, the inverter operates at bus voltage of 800 V, grid voltage of 220 Vrms, grid frequency of 60 Hz, rated power of 6.6 kVA, and switching frequency of 40 kHz. Experimental results confirm that 2MV1Z effectively reduces CMV and leakage current compared to sinusoidal pulse width modulation. The inverter achieves a maximum efficiency of 98.5%, with total harmonic distortion below 4% at full load.