A New Control Method for Bidirectional Isolated AC/DC Matrix Converter

The isolated AC-DC matrix converter (IAMC) has no buffering links such as intermediate capacitors, and there is coupling between the input and output stage converter controls, thereby reducing the control performance of the system. For solving this problem, this paper has proposed a two-stage converter control strategy of IAMC, which directly control the output current and its power transmission through closed-loop control of the full-bridge converter(FBC). The three-phase to single-phase matrix converter(3-1MC) performs independent control on active and reactive power to meet the needs as high-precision control of the power factor on the grid side. The proposed control strategy can avoid the mutual interference caused by the direct control of the same current and power in its input and output control loops, effectively reduces the coupling intensity of the two-stage converter and ensures the good performance of the control system. The simulation is carried out under the MATLAB simulation platform. The results show that compared with the conventional control strategy, this strategy can ensure that the system achieves a significant improvement in current quality while the unit power factor is adjustable, thus verifying the effectiveness and superiority of the proposed control strategy.