Modular Multi-Input High Gain Unfolding Inverter for Nano Grid Applications

Several challenges encountered in the usage of Nano grids which have become a huge interest for 21st-century households with high penetration of renewables. A single PV or fuel cell suffers from low voltage output ranging from 16-50V which constrains the selection of inverter. Thus, a modular multi-input gain unfolding inverter is proposed to address these challenges. The inverter can reach 240V AC 50Hz output with only two active switching devices operating in high switching frequency mode to reduce passive components design. A high-grade boosted AC output is realized due to the modular structure of two buck-boost family submodules followed by a highly efficient line frequency inverter. The buck-boost family submodules have a 180° phase deference which further reduces the passive components and allows high. Due to the unfolding inverter operation, the bulky DC link is replaced with a compact efficient AC link. The topology is analyzed and simulated to validate the approach.