Three-phase voltage-fed quasi-Z-source AC-AC converter

The paper proposes a novel three-phase voltage-fed quasi-Z-source ac-ac converter topology to overcome the shortcomings of the traditional three-phase AC-AC chopper. The quantitative relationship between the output voltage and duty-ratio is deduced by investigating the topology and operating principle. It can provide buck-boost function, and the output voltage of the circuit can keep stable in the case of voltage sagging. Simulation is performed using the MATLAB software, and the experimental circuit is built based on the simulation results, the simulation and experimental results verify the correctness and feasibility of the proposed ac-ac converter topology.