Dead-Time Compensation for Grid-Tied Voltage Source Inverters With SVM$^{2}$ PC

This article presents a dead-time compensation strategy for grid-tied inverters with large output current ripple. A current prediction over the switching sequence is proposed to obtain the current polarity at each switching transition. As a result, the effect of the dead time on the inverter output voltages can be determined and the duty cycles are compensated to maintain the original switching transitions instants. In addition, a disturbance observer is used to mitigate the current prediction error, caused by the nonidealities of the grid-tied inverter system. The constraints obtained from the dead-time compensation method are included in the optimization problem of the model predictive control algorithm to ensure operation in the feasible region of the space-vector diagram. Hardware-in-the-loop and experimental results are obtained to compare the proposed method with a classical compensation strategy without current prediction over the switching period, as well as to demonstrate the good performance and effectiveness of the proposed strategy.