Abstract：In this paper, a piecewise synchronous control strategy of the bidirectional isolated AC-DC matrix converter based on zero vector embedded is proposed. In this control strategy, a symmetrical double-line-voltage modulation is adopted for the front-stage three-phase to single-phase matrix converter (3-1MC), which improves the voltage transfer ratio; a complementary control is employed for the back-stage circuit full-bridge (FB) converter, which is simple and easy to implement. By embedding the zero vector into 3-1MC modulation, the 3-1MC and FB are piecewise synchronous, which enables the bidirectional power transfer. Simulation and experimental results verify that the isolated bidirectional AC-DC matrix converter features balanced sinusoidal currents at grid side, nearly unity input power factor, and stable DC output voltage/current with low ripples. The peak value of inductance current (current stress) decreases first and then increases with the increase of DC output voltage, which is at the minimum value while nUo=√3Ui. Hence, the bidirectional power flow and good input/output performances of the bidirectional isolated AC-DC converter can be ensured under the proposed control strategy. Compared with the traditional control strategy, the bidirectional isolated AC-DC matrix converter with the proposed control strategy has smaller inductance current stress in the lower DC voltage range, which helps to reduce device losses, enhance efficiency and improve system reliability.
梅杨, 许策, 鲁乔初. 基于零矢量嵌入的双向隔离型AC-DC矩阵变换器分段同步控制策略[J]. 电工技术学报, 2021, 36(22): 4784-4794.
Mei Yang, Xu Ce, Lu Qiaochu. Piecewise Synchronous Control Strategy of Bidirectional Isolated Matrix AC-DC Converter Based on Zero Vector Embedded. Transactions of China Electrotechnical Society, 2021, 36(22): 4784-4794.
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