Stability analysis of damping control to suppress filter resonance in multi-modular matrix converter

This paper discusses a stability analysis for a damping control to suppress the LC filter resonance in a multi-modular matrix converter. The damping control is combined with the output current control of the system to reduce the current distortion which is caused by the LC resonance. The stability is analyzed by using the Bode-diagrams of an integrated block diagram of the multi-modular matrix converter. In the simulation, the damping control ensures the gain margin of 4.5 dB, and the system obtains stability. Moreover, from the experimental result, the stable operation of the multi-modular matrix converter is confirmed and the primary current THD of the transformer is 5.0 %. In addition, the transient response characteristics are evaluated, which is based on the overshoot value of the output current with respect to the gain margin in experiments.