Transformer less FPGA Controlled 2-Stage isolated grid connected PV system

Abstract

In this proposed study, Transformerless FPGA Controlled 2-Stage PV System is proposed for 3-phase electrical power generation. In this present scheme, to get AC power, power conditioning has been proposed in two stages; namely in first stage maximum power will be extracted and in second stage DC power will be converted into AC power. In this research paper conversion topology has been proposed for transformer less PV system and verified its results in MATLAB Simulink which is interfaced with Xilinx system generator. To extract optimum DC power from solar PV modules MPPT charge controller is designed. In this study, constant voltage MPPT charge controller is designed based on small signal analysis of converter with PM=57° and GM=14.7dB. After this charge controller output fed to Multi level inverter for the conversion of dc to ac. Proposed multilevel inverter is offering very low line voltage THDs compared with conventional inverter and observed that they are very low, hence required less size and cost of the filter.