Digital Peak Current Mode Control Method for the Single-phase Bi-directional DC-AC Converter

This paper presents a new digital peak current mode controlled single-phase bi-directional DC-AC converter with a current control method that reduces harmonic distortion of AC input/output current. The new current control method estimates and compensates for the deviation between current reference and inductor current in both DC-AC and AC-DC modes. The effectiveness of the proposed method for reducing harmonic current distortion is verified through experiments. Furthermore, the effectiveness of overshooting current suppression against sudden changes in the AC grid voltage is also verified.