In medium‐voltage dc grids, power electronics transformers (PETs) play an important role in interconnecting grids with different voltage levels and directing power flow between grids. This paper presents a comprehensive control strategy for input series output parallel PETs, including control design for submodules consisting of boost and dual active bridge, balancing control between submodules, soft startup and operations after submodule faults. Through the control strategy, the PET is capable of regulating either the voltage or the power on the low voltage side, and it can operate safely and robustly during large transients in startup and submodule failures. The proposed control strategy is validated using PLECS simulation and verified experimentally with a scaled‐down laboratory prototype.

中文翻译：

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MVDC电网中输入串联输出并联电力电子变压器的综合控制策略和稳定运行

在中压直流电网中，电力电子变压器（PET）在互连具有不同电压水平的电网并指导电网之间的电流流动方面发挥着重要作用。本文提出了一种用于输入串联输出并行PET的综合控制策略，包括由升压和双有源桥组成的子模块的控制设计，子模块之间的平衡控制，子模块故障后的软启动和操作。通过控制策略，PET能够调节低压侧的电压或功率，并且能够在启动和子模块故障的大瞬变期间安全，可靠地运行。所提出的控制策略已通过PLECS仿真进行了验证，并通过缩小规模的实验室原型进行了实验验证。