<p>In this study, a modulation optimization scheme is proposed for Vienna rectifiers in high switching frequency application scenarios such as communication power supply and electric vehicle. Although the existing carrier-based discontinuous pulse width modulation methods can reduce most of the switching losses, there are still two key problems. One is that the current distortion in the zero-crossing region has not been solved. The other is that average current fluctuation at the midpoint of the DC side causes midpoint potential oscillation. Therefore, this paper proposes a carrier modulation optimization algorithm for the Vienna rectifier. By adding a compensation component in a specific clamping area and introducing an optimized zero-sequence component in a non-clamping continuous area, the problem of zero-crossing distortion of the AC side current and unbalance of the DC side midpoint potential is alleviated. At the same time, the action times and switching losses of the switching devices are greatly reduced, and the working efficiency of the rectifier is effectively improved. Finally, the effectiveness and practicality of the proposed optimization method are verified by simulation and experimental results.</p>