This paper presents a 13.2 kV class 3-phase solid-state transformer (SST) based on EtherCAT communication. In general, when the structure of the unit module is determined, the number of high-frequency isolated transformers (HFIT) is also proportional to the number of modules. The structure most considered in SST is a 1:1 combination of AC/DC converter and DC/DC converter. To optimally implement a 3-phase SST, a topology for reducing passive elements such as switching elements and HFIT is proposed. It also describes the design of HFIT used in DC/DC converter. EtherCAT communication with high transmission speed and expandability is applied to control the SST composed of unit modules stably, and a multi-core microcontroller unit (MCU) is applied to achieve both a high-speed communication cycle and complicated control algorithm execution. The discussions are validated using a 300 kW 13.2 kV class 3-phase SST prototype in various conditions.

中文翻译：

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基于 EtherCAT 通信的 13.2 kV 三相固态变压器系统

本文介绍了一种基于 EtherCAT 通信的 13.2 kV 级三相固态变压器 (SST)。一般来说，当单元模块的结构确定时，高频隔离变压器（HFIT）的数量也与模块的数量成正比。SST中考虑最多的结构是AC/DC转换器和DC/DC转换器的1:1组合。为了优化实现三相 SST，提出了一种减少无源元件（如开关元件和 HFIT）的拓扑结构。它还描述了用于 DC/DC 转换器的 HFIT 的设计。采用具有高传输速度和可扩展性的EtherCAT通信稳定控制由单元模块组成的SST，并采用多核微控制器单元（MCU）实现高速通信周期和复杂控制算法的执行。