Driven by the large-scale integration of distributed new energy and the upgrading of the power systems

bipolar DC microgrids possess significant application value. Aiming at the inter-pole voltage imbalance issue existing in current bipolar DC microgrids

a multi-input converter with voltage self-balancing capability between the two poles was proposed. This converter provides excellent bipolar voltage self-balancing capability even under unbalanced loading conditions of the positive and negative poles

without requiring additional complex voltage balancing control algorithms. Additionally

the converter features advantages such as low switching device stress

simple control method

and flexible structural expandability. Firstly

the converter deduction process was introduced. Secondly

the operation mode analysis

voltage conversion gain

and device stress of the proposed converter were analyzed. Then

the output voltage self-balancing principle of the converter was elaborated in detail

and its quantitative calculation was carried out. Finally

an experimental prototype with a rated power of 1 kW was built

which verifies that the prototype has good voltage self-balancing performance

demonstrating correctness and effectiveness of the theoretical analysis.