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A Switched-Capacitor Multilevel Inverter with Reduced Power Components in Current Loops for Renewable Energy Generation

Abstract A switched-capacitor multilevel inverter (SCMLI) is proposed in this article for the DC-AC conversion in the renewable energy generation (REG) system. The proposed topology reserves the advantages of common SCMLIs, such as the boost ability, the self-voltage balancing of capacitors, and the inductive-load. Thus, the conventional two-stage DC-AC structure in the REG system can be realized through a single stage with only one controller, thus decreasing the complexity and increasing the efficiency. The major advantage of the proposed SCMLI over the existing ones is that reduced components are contained in current loops, which can further increase the conversion efficiency. The circuit topology, operating mechanism, and parameter analysis of the proposed SCMLI are presented. Qualitative and quantitative efficiency comparisons with typical SCMLIs are conducted. A nine-level simulation model and the corresponding experimental prototype are implemented for performance evaluations. Finally, the feasibility and superiority are verified by a 230-W experimental prototype.