Performance investigation of FPGA controlled central three-level diode clamped inverter in two-stage solar photo voltaic (SPV) system

This paper includes the discussion about the principle of working, performance investigation and simulation of FPGA controlled three-level diode clamped inverter, which is fed by solar PV based DC bus. DC bus was created with the help of solar PV modules and charge controller to feed DC loads directly or AC loads indirectly through proposed three-level inverter. FPGA based three-level inverter was simulated on Xilinx system generator interfaced MATLAB Simulink environments. For, FPGA's have been designed at high clock frequencies; firing pulses can be generated by system generator tool at high switching frequency to control the three-level inverter in the Simulink environment. FPGA controller is economical for controlling any equipment consisting of many controllable switches. 1kwp solar PV DC supply is given to inverter as a supply to investigate the performance of a proposed inverter with a RL load of 0.8 lagging power factor. Performance parameters have been calculated with the help of Simulink powerful graphical user interface tool for performance investigation of proposed inverter. Based on performance parameters it can be judged that FPGA based three-level inverter is offering better performance compared to normal conventional inverters.