Damping control combined to output stage for a multi-modular matrix converter

This paper discusses a damping control that is applied for multi-modular matrix converters to suppress the oscillation by the LC resonance caused from the input filter. The multi-modular matrix converter connects a multiple winding transformer with several modules, which each module is consisting of a three-phase to single-phase matrix converter. It is found that the multi-modular matrix converter has the resonance problem between the leakage inductance of the transformer and filter capacitors. In this paper, the damping control that is combined to the output current control of the multi-modular matrix converter is implemented to suppress the resonance and to achieve better input current quality. The proposed damping control can divert the output current sensors for ACR (Auto Current Regulator), which is generally used in adjustable speed drive system of a motor, and additional sensors are not required. From the experimental results, the proposed damping control improves the input current THD by 72.1 %.