A High Gain Bidirectional Interlink DC-DC Converter to Integrate Unipolar and Bipolar DC Microgrids

In the era where energy efficiency and renewable integration are crucial, DC microgrid has emerged as essential, sustainable solution for modern power distribution. This paper introduces an interlink DC-DC converter to exchange energy between a low voltage unipolar and high voltage bipolar DC microgrid. The proposed converter features bidirectional buck-boost capabilities with high voltage transfer ratio. Furthermore, the converter acts as self-balanced voltage balancer which autonomously balances the voltage between the two poles of bipolar DC microgrid without requiring any auxiliary circuit or control requirement. Extensive steady state analysis, and design of passive components are carried out. Simulation of the proposed converter is performed to validate the performance of the proposed converter in all the working modes.