Design and analysis of a flyback micro inverter with H5 inverter

Abstract

Fossil-based energy sources cause air pollution, climate change and also it is known that fossil energy sources are not sustainable. Therefore, researchers focus on investigation of alternative energy sources for electricity generation. There are lots of alternative energy sources such as hydrogen, hydropower, biomass, solar, wind, geothermal and etc. The solar energy is the most popular among others. This paper deals with design of micro inverter at 390 Wp rated power. It is comprised by flyback converter and H5 inverter topologies. The flyback converter which provides galvanic isolation is controlled with Maximum Power Point Tracking (MPPT) algorithm while the inverter stage is controlled by sinusoidal pulse width modulator (SPWM) with PI controller. The designed micro inverter is analyzed with MATLAB Simulink software under changing irradiation conditions and it is observed that the designed micro inverter copes with partial shading condition. The input voltage that is maximum 54 V supplied by PV module is set constant at 220 Vrms ac at the output. Total harmonic distortion (THD) ratios of output voltage and current are measured at 2.59% with 94.08% efficiency of micro inverter.