Instantaneous DC Bias Suppression Strategy for Isolated AC/DC Matrix Converters

The isolated AC/DC matrix converter, with its bidirectional power transmission characteristics, demonstrates broad application potential in the field of new energy. However, due to its specific phase-shift modulation requirements, significant DC bias currents may arise during rapid changes in transmitted power, posing a threat to the safe operation of the converter. To address this issue, this paper derives a mathematical relationship between transmitted power and instantaneous DC bias current and proposes a transient control strategy based on adjusting the phase-shift angle and modulation coefficient. This method effectively suppresses DC bias current induced by power fluctuations. The feasibility and effectiveness of the proposed method are verified through simulations.