Photovoltaic Fed Grid-Tie Inverter Design and Simulation

Abstract

This paper presents the design and simulation of a grid-tie inverter that has one-phase output. Solar panels connected to the inverter through LLC boost converter. The DC/DC converter boosts the 25-40 V input voltage to 340 V. The magnitude of the effective and apparent power at the output of the inverter can be adjusted separately, which is set by a control circuit. The inverter is connected to the grid through an LCL filter without a transformer. The study describes the inverter, the PLL circuit, the LCL filter and the LLC converter as well. The simulation was implemented in a MATLAB based graphical development environment (Simulink).