Hybrid PWM scheme for the grid inverter

A hybrid PWM scheme for the grid inverter is investigated, which combines the merits of space-vector PWM (SVM) and Selected Harmonic Elimination PWM (SHEPWM). SHEPWM is adopted at steady state while SVM is adopted to achieve better dynamic performance at grid fault. A transition strategy between these two PWM schemes is proposed, which achieves smooth and quick transition by optimizing the switching state during transition. Finally the proposed transition strategy for the hybrid PWM scheme is validated by the experiment.