FPGA based PV grid-connected inverter using partition input union output dual impedance qZSI

Abstract

In this research, FPGA implementation of high gain topologies are proposed for 3-phase grid connected quasi Z-Source Inverter(qZSI), desirable for application that involve solar photovoltaic systems, like continuous input current configuration of qZSI with two-switched impedance network. Identical with Diode Assisted quasi-Z source inverter (DA-qZSI), the newly introduced Partition input Union output Dual Impedance quasi -Z Source Inverter (PUDL-qZSI) topology achieves great boost factor inversion at low Shoot-Through (ST) duty cycle and a higher Non Shoot-Through (NST) period to yield an increased Total Harmonic Distortion (THD) output current. This research investigates about the working principles and assessment of the newly introduced PUDL-qZSI with continuous input PV current configured two-switched impedance networks and thereafter it is comparable with qZSI, and DA-qZSI. The topologies analysis is performed in the steady state and the validation of their dynamic performances are carried out using the simulated results obtained from MATLAB/Simulink. In addition, the experimental results shows that the proposed FPGA based controller achieve a good performance at small calculation time, which is precise for PUDL-qZSI PV based grid connected system.