A Common-Mode Voltage Suppression Strategy Based on Double Zero-Sequence Injection PWM for Two-Level Six-Phase VSIs

A common-mode voltage (CMV) suppression strategy, namely double zero-sequence injection (DZICMV), is proposed in this paper for an asymmetrical six-phase induction motor fed by two-level dual three-phase source inverters (VSIs). In the sinusoidal waveforms injected signals are employed as modulation signals, and two opposite triangular used carriers. The fundamental period divided into 24 sectors. each sector, carrier medium amplitude phase distinct from carriers other phases set of windings. Using method, zero vectors (000) (111) windings can be eliminated, peak values sub-CMV total CMV reduced ±Udc/2 to ±Udc/6. experiment results show that root mean square (RMS) value leakage current DZICMV 51.83% compared with PWM (DZIPWM) strategy. It also found four existing benchmark strategies therein nearly all ±Udc/2, only low linear region could one these suppress However, ±Udc/6 whole range. Moreover, maximum index 1.15, which larger than strategies, whose 1.