Integrated dead‐time compensation and elimination approach for model predictive power control with fixed switching frequency

Abstract

To solve the problem of variable switching frequency in conventional model predictive power control (MPPC), many modified MPPCs with fixed switching frequency have been proposed. However, as the switching frequency increases, additional current harmonics caused by the dead-time are added into the grid current. In this study, an integrated approach with compensation process and elimination process is proposed to eliminate the adverse effect of dead-time. The elimination process with improving gate signals is applied when the phase current is large enough. In contrast, the compensation process is utilised when the phase current is relatively small and the elimination process is troubled by the misjudgement of the current polarity. The experimental results with different dead-time and active power reference are provided to demonstrate the validity of the integrated approach. The integrated approach can further reduces the total harmonic distortion compared to the pure dead-time compensation approach and almost removes the current harmonics caused by the dead-time. Besides, the static error of the power caused by dead-time is dramatically reduced by utilising the integrated approach.