Studies on Quasi-Z-Source-Based Three-Phase Isolated DC/DC Converter for Distributed Power Generation

Distributed generation is an emerging concept in the electricity sector, which represents good alternatives for electricity supply instead of the traditional centralized power generation concept. Among different distributed generation schemes, fuel cell is expected play a big part due to its inherent advantages. The power density of the quasi-Z-source-based single-phase isolated DC/DC converter is increased by quasiZ-source-based three-phase isolated DC/DC converter. The present paper describes novel quasi-Z-source-based threephase isolated DC/DC converter for distributed power generation. It contains voltage-fed quasi-Z-source inverter with continuous input current on the primary side, a threephase isolation transformer and a three-phase voltage doubler rectifier. The model of the quasi-Z-source-based isolated DC/DC converter is simulated in the MATLAB. Simulated data related to gate signals of quasi-Z-source inverter, voltage from fuel cell, DC-link voltage, primary & secondary voltage from the isolation transformer, output voltage from the voltage doubler rectifier are used to test the performance of the quasi-Z-source-based DC/DC converter.