Operation of Four-Level ANPC Inverter Based on Space-Vector Modulation for Common-Mode Voltage Reduction

In this paper, the problem of common-mode voltage (CMV) in four-level active neutral-point clamped (ANPC) inverters is alleviated with a modified space-vector modulation. With the proposed technique, the CMV peak value is reduced by 40 % compared to the in-phase disposition (IPD) carrier-based modulation, whereas the total harmonic distortions (THDs) are similar at high modulation indices. The effectiveness of the proposed method and the power losses across the switching devices have been verified by simulation results.