Analysis of a Grid Tie Inverter for attaining the Maximum Power Factor and Minimum Total Harmonic Distortion

A grid tie inverter (GTI) requires a proper adjustment of Power Factor (PF) to provide efficient power supply to the utility power grid while converting the DC power to an adjustable grid based AC power. Additionally, the inverter has to be designed based on a minimal total harmonic distortion that occurs on the utility power grid voltage and current while such conversion occurs. Presented herein is a power and control system architecture of a 500 W inverter for achieving a better power factor (PF) and which can efficiently diminish the harmonic content out of the utility power grid. Implementing an inverter that consists of a full-bridge switching configuration, the single stage of DC-to-AC power conversion is inventively designed hereby to attain maximum power factor as well to generate a minimum THD containing sinusoidal output voltage that is adjustable with the grid, is the novel feature of this paper.