The back-to-back connection of two three-to-single-phase matrix converters (MCs) through a high-frequency transformer to create the so called MC-based solid state transformer (SST) for interactive grid interfacing is proposed in this paper. The solution provides single-stage bidirectional ac–ac power conversion. There are advantages of no lifetime-limited storage capacitors, light weight, and compact volume. The conventional modulation methods of this MC-SST system require additional control design for power management. Besides, space vector modulation contains sophisticated voltage and current vectors computation and duty cycle composition, considering the two back-to-back connected three-to-single-phase MCs. In this paper, a model predictive control (MPC) is proposed for this MC-SST linking different ac grids. The proposed MPC predicts the state variables based on the discrete model of MC-SST system and the present circuit variables, and then selects an optimal switching state that ensures the smallest value of a cost function, for the next sampling time. Simulation and experimental studies are carried out to demonstrate effectiveness and simplicity of the proposed MPC for such MC-SST grid-interfacing system.

中文翻译：

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带有模型预测控制的基于矩阵变换器的固态变压器的交互式电网接口系统

本文提出通过高频变压器将两个三相单相矩阵转换器（MC）背靠背连接以创建所谓的基于MC的固态变压器（SST）用于交互式电网接口。该解决方案提供了单级双向交流-交流电源转换。它具有无寿命限制的存储电容器，重量轻和体积紧凑的优点。此MC-SST系统的常规调制方法需要用于电源管理的其他控制设计。此外，考虑到两个背对背连接的三对单相MC，空间矢量调制还包含复杂的电压和电流矢量计算以及占空比组成。本文针对链接不同交流电网的MC-SST提出了一种模型预测控制（MPC）。提出的MPC基于MC-SST系统的离散模型和当前电路变量来预测状态变量，然后为下一个采样时间选择确保成本函数最小值的最佳开关状态。进行了仿真和实验研究，以证明所提出的MPC对于此类MC-SST电网接口系统的有效性和简便性。