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

Abstract

The matrix converter (MC) with an LC filter at source side suffers from system instability, thereby requiring damping control. To improve system stability, this paper proposes a novel active damping control strategy. First, the method of generating space vector modulation signals is improved, in order to make the amplitude and phase 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 way, the proposed strategy can suppress the oscillations in source currents directly. Besides, it is effective with source voltages or capacitor voltages sampled for modulation, regardless of the operation mode of MC. Furthermore, it is applicable to most of existing modulation algorithms. Finally, experimental results of four-quadrant operation on a 2.4-kW prototype illustrate that, under the condition of the same parameters, the proposed active damping control strategy performs better than passive damping control in filtering and the same in damping at source side, without sacrificing the driving performance at output side.