A Dead-Time Elimination DSVPWM with High Efficiencies and Low Harmonics for Dual-Input Three-Level Converters

To achieve high efficiencies and low harmonics, in this paper, the discontinuous space vector pulse-width-modulation (DSVPWM) is analyzed and combined with the dead-time elimination strategy in PWM, and a novel dead-time elimination DSVPWM (DTE-DSVPWM) is proposed. The loss model of power devices in the three-level (3L) converter is investigated with the unbalanced dc-link voltages. Based on this model, the device losses with the proposed strategy are calculated. To validate the accuracy of the loss calculation, the calculation of device loss is carried out using PLECS. Comparative calculation results and simulation results verify that, the proposed DTE-DSVPWM can achieve high efficiencies and low harmonics simultaneously.