SVM2PC with Dead-Time Compensation for Grid-Tied Inverters

This paper investigates the impact of the dead-time compensation on fixed frequency space vector modulated model predictive control for grid-tied inverters. Since grid-tied inverters with LCL filters may have inverter-side currents with large high-frequency current ripple, multiple zero crossings should be properly considered for dead-time compensation. Therefore, this paper proposes a method to predict the current at the switching instants within the sampling period. It is demonstrated that there is a significant improvement in terms of low-frequency harmonics and tracking error of the grid-side currents with the proposed method. In addition, the constraints imposed by the dead-time compensation are included in the optimization problem of the Space Vector Modulated Model Predictive Control algorithm. Finally, Hardware-in-the-loop results are presented to demonstrate the good performance of the proposed dead-time compensation technique.