Dual carrier based PWM strategy for common-mode voltage reduction of three-phase voltage source inverters

Abstract

A pulse-width modulation (PWM) strategy based on dual carrier is proposed to suppress the common-mode voltage (CMV) of three-phase voltage source inverters (VSIs). This strategy employs two triangle carriers with opposite phase to reduce the peak value of the generated CMV by avoiding zero voltage vectors. In particular, the effective phase range of the two opposite carriers is derived. The optimal initial phase of the dual carrier is determined through the output performance comparison of VSI. Finally, the experimental results are presented to illustrate the feasibility and validity of the proposed modulation strategy.