Off-grid system using a converter with multiple DC inputs and three-phase, multi-level AC output

This paper describes the possibility of interfacing a three-phase voltage converter with a configurable DC input and a multi-level AC output with an on-grid system. The described converter uses magnetically coupled reactors. The multilevel output voltage of the converter is characterized by a favorable value of the THD coefficient. With the ability to configure DC inputs, the proposed converter allows easier integration of renewable energy installations, such as PV. A control strategy for the voltage inverter has been developed. Experimental studies of the basic converter design are presented. An analysis of the converter about cooperation with inverters is presented. The use of magnetically coupled reactors made it possible to use a magnetic system with lower power and dimensions. Key words. voltage inverters; magnetically coupled reactors; converter; coupling; on-grid; isolated grid, PV.