To improve energy shortage and environmental pollution, the research of new energy power generation technology and microgrid has become a research hotspot in the field of electrical engineering. The energy storage system is an important part of the microgrid. In the process of realizing the energy interaction between the microgrid and the energy storage system, the bidirectional DC-DC converter with a wide voltage range plays a key role. Based on the requirements of modular wide voltage range bidirectional DC-DC converters, to improve the output power level, modular parallel connection is adopted,and CLLLC resonant converter and its parallel current sharing technology have been studied in detail. To verify the feasibility and rationality of the hybrid control of the bidirectional CLLLC resonant converter based on virtual impedance,experiments were carried out on an experimental platform with two 3kw outputs in parallel.

DC-DC converter;CLLLC resonant converter;hybrid control;parallel flow