Multiple PR Current Regulator based Dead-time Effects Compensation for Grid-forming Single-Phase Inverter

A multiple proportional resonant (PR) current regulator based dead-time effects compensation method for grid-forming single-phase inverter is proposed. Most of dead-time effect studies are based on the polarity of the average inductor current. However, dead-time effect is eliminated at zero-crossing zone of the inductor current. Conventional dead-time compensation methods based on the polarity of the average inductor are not suitable for grid-forming single-phase inverter because of the large inductor current ripple and wide load range. In this paper, the dead-time effect considering ripple current is investigated and the relation between the load current and the range of the zero-crossing zone is discussed. Furthermore, the zero current clamping (ZCC) phenomenon and oscillation induced by dead-time are also discussed. In order to compensate the dead-time effects, a multiple PR current regulator based dad-time compensation method is proposed to reduce the voltage disturbance caused by dead-time effect in single-phase grid-forming inverter. The simulation and experiment results show the validity of the analysis and the distortion of the inverter output voltage is eliminated.