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Bidirectional Power Flow Control using CLLC Resonant Converter for DC Distribution System

K.Ramya, R.Sundaramoorthi

A single-phase bi-directional CLLC resonant converter with dc-bus voltage regulation and power compensation is proposed for dc distribution applications. This converter can be operated in both buck and boost mode. In the presence of dc bus, the battery is being charged and in the absence of the dc bus the battery supplies power. A suitable control circuit is presented to improve the power conversion efficiency and reduces the switching loss of the conventional isolated bidirectional ac-dc converter. The ZVS operation of the primary power IGBTs and the soft commutation of the output rectifiers are significant factors for the efficiency-optimal design of the bidirectional fullbridge CLLC resonant converter .Finally simulation results for boost and buck modes of CLLC resonant converter is obtained.