Bridge-to-Bridge Independent Control Method for Dual-Active-Bridge Interlinking Converter

In dual-active-bridge (DAB) converters, the driving-synchronization signal is supposed to be required to be transmitted across the primary bridge and the secondary bridge to realize a phase shift for power flow. In this letter, a novel bridge-to-bridge independent ((BI)-I-2) control method is proposed. In this control method, cross-bridge transmission of sampling/driving signals is not required. Thus, full modularity of each side in the DAB converter was realized. (BI)-I-2 control is suitable for high-voltage series low-voltage parallel (HSLP) modular DAB interlinking converter in medium-voltage dc applications because: first, the bridge-level modularity of (BI)-I-2 control benefits electromagnetic compatibility and insulation design with the HSLP connection; second, (BI)-I-2 control features series-side voltage sharing; and third, (BI)-I-2 control can adapt for various operation modes of microgrids.

Automated summary

A novel bridge-to-bridge independent control method is proposed for high-voltage series low-voltage parallel modular DAB interlinking converters in medium-voltage dc applications. This control method achieves full modularity of each side in the converter without the need for cross-bridge transmission of signals, and it offers benefits such as electromagnetic compatibility, insulation design, and voltage sharing.