Constant speed control for a reverse matrix converter under variable input conditions

This paper proposed control strategy of induction motor (IM) fed by indirect matrix converter (IMC) in reverse power mode. The IMC is an AC/AC power conversion system without dc-link energy storage elements as bulky capacitor or inductor. For this reason, the IMC has many advantages that compact, low weight and durability. Furthermore, it features full four quadrant operation and sinusoidal input currents. However the IMC usually operated with maximum voltage transfer ratio of 0.866, which is an inherent restriction. In order to increase the voltage transfer ratio, the novel structure of the IMC that reverses the direction of power flow is adopted. This structure operates boost mode without auxiliary elements or circuits. The effectiveness of the proposed method is confirmed by simulation results.