Bidirectional isolated three‐phase dc‐dc converter using coupled inductor for dc microgrid applications,International Journal of Circuit Theory and Applications

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Bidirectional isolated three‐phase dc‐dc converter using coupled inductor for dc microgrid applications
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-04-17 , DOI: 10.1002/cta.2795
Menaouar Berrehil El Kattel _{1,

2} , Robson Mayer ₁ , Maicon Douglas Possamai ₁ , Sergio Vidal Garcia Oliveira ₁

Affiliation

The main objective of this project is to study the analysis and design of an isolated three‐phase bidirectional dc‐dc converter connected to the dc microgrid system. The proposed topology achieves efficient power conversion with a wide input voltage range, continuous input current, and bidirectional operation. In forward mode operation, the topology acts as a three‐phase push‐pull converter to reach a step‐up voltage conversion ratio (90 to 450 V). In backward mode operation, the converter acts as an interleaved flyback converter to provide a step‐down voltage conversion ratio (450 to 90 V). Over and above that, in both operation senses, the dc voltage gain is presented. The main advantages of this topology are high‐switching frequency, the three‐phase transformer that provides galvanic isolation between the dc voltage link bus to the battery or ultra‐capacitor storage, and input/output filters size reduction. Besides, a fewer number of power switches, the frequency of output voltage, and input current ripple are three times higher than the switching frequency. The three active switches are connected to the same reference, which simplifies the gate drive circuit. Ultimately, the theoretical analysis of the proposed topology is carefully confirmed with the experimental results of the 4 kW converter prototype.

中文翻译：

使用耦合电感器的双向隔离式三相DC-DC转换器，适用于DC微电网应用

该项目的主要目的是研究连接到直流微电网系统的隔离式三相双向dc-dc转换器的分析和设计。拟议的拓扑结构在宽输入电压范围，连续输入电流和双向操作的情况下实现了有效的功率转换。在正向模式操作中，该拓扑充当三相推挽式转换器，以达到升压转换比（90至450 V）。在反向模式操作中，该转换器充当交错式反激转换器，以提供降压电压转换比（450至90 V）。除此之外，在两种操作方式下，都提供了直流电压增益。这种拓扑的主要优点是高开关频率，在直流电压链路总线到电池或超级电容器存储之间提供电流隔离的三相变压器，以及减小输入/输出滤波器的尺寸。此外，电源开关的数量更少，输出电压的频率和输入电流纹波比开关频率高三倍。三个有源开关连接到相同的基准，从而简化了栅极驱动电路。最终，通过4 kW转换器原型的实验结果仔细确认了所建议拓扑的理论分析。

更新日期：2020-04-17

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