Investigation of dual-bridge matrix converter operating under unbalanced source voltages

The dual-bridge matrix converter concept has been gaining recognition as a promising circuit alternative in recent years. A direct feed-forward unbalance control method with power factor adjustment ability is developed for a 9-switch dual-bridge matrix converter system. It firstly detects the line side source voltages. Then, after adjusting the switching functions of only the line side converter, the system can provide balanced output voltage with slightly distortion of line side current. Analysis demonstrates that the output voltage capacity and power factor adjustability is limited under unbalanced conditions. Theory analysis, simulation and experimental results are presented to verify the effectiveness of this control method.