CLLC-type dc transformer (CLLC-DCT) is very popular in the hybrid ac-dc microgrid thanks to its high-power density advantage and good bidirectional power transfer capacity. In the hybrid ac/dc microgrid, the open-loop control is always utilized by the CLLC-DCT to cooperate with the bidirectional interlinking converter to realize the power and voltage conversion between the ac and dc bus. This paper first studies the circuit parameters design of the open-loop controlled CLLC-DCT with consideration of such a realistic problem: The real inductors/capacitors values are actually different with their theoretically designed values due to the operation power and temperature variation. To solve this problem, a robust circuit parameters design scheme is proposed for the CLLC-DCT in this paper. With the proposed scheme, the designed CLLC-DCT exhibits good power transmission and voltage regulation ability in the hybrid ac/dc microgrid even when its actual inductors/capacitors values vary with the practical power and temperature. The robust design method is experimentally verified in a hybrid ac/dc microgrid prototype.

中文翻译：

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混合AC__C微电网中CLLC型直流变压器的鲁棒电路参数设计


CLLC型直流变压器（CLLC-DCT）凭借其高功率密度优势和良好的双向电力传输能力，在交直流混合微电网中非常受欢迎。在交直流混合微电网中，CLLC-DCT多采用开环控制，配合双向互联变流器，实现交直流母线之间的功率和电压转换。本文首先研究了开环控制的CLLC-DCT的电路参数设计，考虑到这样一个现实问题：由于工作功率和温度变化，实际的电感/电容值实际上与理论设计值不同。为了解决这个问题，本文提出了一种针对 CLLC-DCT 的鲁棒电路参数设计方案。通过所提出的方案，即使实际电感/电容值随实际功率和温度变化，设计的 CLLC-DCT 在交直流混合微电网中也表现出良好的电力传输和电压调节能力。该鲁棒设计方法在混合交流/直流微电网原型中得到了实验验证。