For assuring the still stable operation of modular multilevel matrix converter (M3C) in asymmetrical fault condition of AC network

the asymmetrical fault control strategy of AC interconnection system based on M3C is studied in this paper. The decoupling mathematical model of M3C-based ac/ac system after dual αβ0 coordinate transformation is derived. On this basis

controller for the two-side AC systems connected to M3C are designed respectively. Considering the control deviation and control delay due to the detious and multiple control logic control logic process in the individual design of positive and negative sequence controller

the proportional resonance controller is adopted in this paper to control the total currents. By adjusting the distribution of the four circulating currents among the nine branches of M3C

the total capacitive voltage and the four dimensions of capacitive voltage balance control between three sub-converters and between the sub-modules inside the single sub-converter and branch can be achieved. Finally

simulation analysis is conducted on the effectiveness of the proposed control strategy and designed controller through case. The results show that the control strategy designed in this paper can ensure the reliable operation of the entire system during the transient process of two-phase asymmetric short-circuit faults in the AC system.