Dead-Time Compensation for Grid-Following Inverters with SVM²PC

This paper presents a dead-time compensation method for grid-tied inverters controlled by Space Vector Modulated Model Predictive Control. This method is general and can be applied to grid-tied inverters with an LCL filter and large high-frequency ripple in the inverter-side currents, which can result in multiple zero crossings in the currents during each switching period. A current prediction over the switching sequence is proposed to obtain the current polarity information at each switching transition, allowing to determine the effect of the dead time in the inverter output voltages and compensate the duty-cycles to maintain the original instants of the switching transitions. The constraints obtained from the dead-time compensation method are included in the optimization problem of the control algorithm to ensure operation in the feasible region of the space-vector diagram. In addition, hardware-in-the-loop results are obtained to demonstrate the good performance and effectiveness of the proposed dead-time compensation method.