Common mode voltage suppression strategy of ANPC three-level inverter based on carrier reversal

抄録

Aiming at the problem of high common-mode voltage in active midpoint clamp (ANPC) three-level three-phase four-bridge inverter topology, a common-mode voltage suppression strategy based on carrier reversal is proposed, which can suppress common-mode voltage (CMV) under different operating conditions. The influence factors of CMV and the influence law of carrier change on CMV are analyzed, and the effect of reverse carrier modulation strategy on suppressing CMV is proved. The new modulation strategy proposed in this paper is a further improvement on the traditional reverse carrier modulation strategy. This suppression strategy can effectively reduce the CMV peak and switching times, but does not occupy additional dsp computing resources. Finally, the feasibility and effectiveness of the proposed method are verified on the experimental platform.