New topology three phase multilevel inverter for grid-connected photovoltaic system

This paper presents a new schematic for three phase seven-level inverters. The proposed topology minimizes switching, reduces short circuiting, is easy to control, and can mask through upper-level switches the work of lower levels. System improvements include low ripple-current, high power conversion and minimized switching, which are verified in simulations using the Matlab/Simulink software package. Experimental results are obtained through the use of field programmable gate arrays (FPGA), and the pulse generation is carried out using the SPARTAN 3A DSP board. The proposed topology has been experimentally implemented for both five-level and seven-level pulse width modulated laboratory inverters.