Active damping control strategy of matrix converter via modifying input reference currents


The matrix converter (MC) with an LC filter at source side suffers from system instability, thereby requiring damping control. To boost system stability, this paper proposes a completely unique active damping control strategy. Initial, the strategy of generating space vector modulation signals is improved, so as to form the amplitude and part angle of input currents directly controllable without affecting the priority of output voltage control. Then, the proposed strategy, which is realized by injecting damping signals into input reference currents, is presented. In this means, the proposed strategy will suppress the oscillations in source currents directly. Besides, it is effective with supply voltages or capacitor voltages sampled for modulation, no matter the operation mode of MC. Furthermore, it's applicable to most of existing modulation algorithms. Finally, experimental results of 4-quadrant operation on a 2.4-kW prototype illustrate that, below the condition of the same parameters, the proposed active damping control strategy performs higher than passive damping management in filtering and the identical in damping at supply facet, without sacrificing the driving performance at output side.

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