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Simplified Multilevel Hybrid Microgrids Using An Integrated AC-DC-DC Converter

Multilevel hybrid microgrids have many attractive features, but the significant number of converters in such grids make them expensive and complex. A new reduced-switch three-phase AC-DC-DC converter that interfaces an AC sub-grid that is connected to the utility to a multilevel DC sub-grid is proposed in this paper to simplify hybrid AC-DC architectures. The new converter is simple to control and consists of fewer switches than earlier proposed AC-DC-DC converters of similar type. In this paper, the operation of the proposed converter is explained and its features are discussed. Experimental results of a scaled-down prototype that confirm the feasibility of the converter are also presented.