Transformer-less AC-AC system using dual inductor buck converter and multi-level inverter

The Solid-State Transformer (SST), which is the substitution of conventional transformers using power electronics technique has been regarded as emerging technologies. SST is being spotlighted because it can complement the disadvantage of traditional transformers and can be applied to various applications such as renewable energy sources, DC distribution system, smart grid systems, and etc. However, even though these systems have been replacing conventional low frequency transformers, they eventually require high-frequency transformers to provide isolation to the DC-DC power conversion stage. To eliminate the high frequency transformers, this paper proposes a dual inductor buck converter, a new transformer-less topology with low leakage current required for isolated DC sources. The proposed ac-ac circuit has been simulated using PSIM simulation with 1kW.